Queryable.Average Queryable.Average Queryable.Average Queryable.Average Method

Definition

数値のシーケンスの平均を計算します。 Computes the average of a sequence of numeric values.

Overloads

Average(IQueryable<Single>) Average(IQueryable<Single>) Average(IQueryable<Single>) Average(IQueryable<Single>)

Single 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Single values.

Average(IQueryable<Nullable<Single>>) Average(IQueryable<Nullable<Single>>) Average(IQueryable<Nullable<Single>>) Average(IQueryable<Nullable<Single>>)

Null 許容型の Single 値のシーケンスの平均を計算します。 Computes the average of a sequence of nullable Single values.

Average(IQueryable<Nullable<Int64>>) Average(IQueryable<Nullable<Int64>>) Average(IQueryable<Nullable<Int64>>) Average(IQueryable<Nullable<Int64>>)

Null 許容型の Int64 値のシーケンスの平均を計算します。 Computes the average of a sequence of nullable Int64 values.

Average(IQueryable<Nullable<Double>>) Average(IQueryable<Nullable<Double>>) Average(IQueryable<Nullable<Double>>) Average(IQueryable<Nullable<Double>>)

Null 許容型の Double 値のシーケンスの平均を計算します。 Computes the average of a sequence of nullable Double values.

Average(IQueryable<Nullable<Int32>>) Average(IQueryable<Nullable<Int32>>) Average(IQueryable<Nullable<Int32>>) Average(IQueryable<Nullable<Int32>>)

Null 許容型の Int32 値のシーケンスの平均を計算します。 Computes the average of a sequence of nullable Int32 values.

Average(IQueryable<Int64>) Average(IQueryable<Int64>) Average(IQueryable<Int64>) Average(IQueryable<Int64>)

Int64 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Int64 values.

Average(IQueryable<Int32>) Average(IQueryable<Int32>) Average(IQueryable<Int32>) Average(IQueryable<Int32>)

Int32 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Int32 values.

Average(IQueryable<Double>) Average(IQueryable<Double>) Average(IQueryable<Double>) Average(IQueryable<Double>)

Double 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Double values.

Average(IQueryable<Decimal>) Average(IQueryable<Decimal>) Average(IQueryable<Decimal>) Average(IQueryable<Decimal>)

Decimal 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Decimal values.

Average(IQueryable<Nullable<Decimal>>) Average(IQueryable<Nullable<Decimal>>) Average(IQueryable<Nullable<Decimal>>) Average(IQueryable<Nullable<Decimal>>)

Null 許容型の Decimal 値のシーケンスの平均を計算します。 Computes the average of a sequence of nullable Decimal values.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する Single 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Single values that is obtained by invoking a projection function on each element of the input sequence.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する、null 許容の Single 値のシーケンスの平均値を計算します。 Computes the average of a sequence of nullable Single values that is obtained by invoking a projection function on each element of the input sequence.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する、null 許容の Int64 値のシーケンスの平均値を計算します。 Computes the average of a sequence of nullable Int64 values that is obtained by invoking a projection function on each element of the input sequence.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する、null 許容の Int32 値のシーケンスの平均値を計算します。 Computes the average of a sequence of nullable Int32 values that is obtained by invoking a projection function on each element of the input sequence.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する、null 許容の Double 値のシーケンスの平均値を計算します。 Computes the average of a sequence of nullable Double values that is obtained by invoking a projection function on each element of the input sequence.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する Int64 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Int64 values that is obtained by invoking a projection function on each element of the input sequence.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する Int32 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Int32 values that is obtained by invoking a projection function on each element of the input sequence.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する Double 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Double values that is obtained by invoking a projection function on each element of the input sequence.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する Decimal 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Decimal values that is obtained by invoking a projection function on each element of the input sequence.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する、null 許容の Decimal 値のシーケンスの平均値を計算します。 Computes the average of a sequence of nullable Decimal values that is obtained by invoking a projection function on each element of the input sequence.

Average(IQueryable<Single>) Average(IQueryable<Single>) Average(IQueryable<Single>) Average(IQueryable<Single>)

Single 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Single values.

public:
[System::Runtime::CompilerServices::Extension]
 static float Average(System::Linq::IQueryable<float> ^ source);
public static float Average (this System.Linq.IQueryable<float> source);
static member Average : System.Linq.IQueryable<single> -> single
<Extension()>
Public Function Average (source As IQueryable(Of Single)) As Single

パラメーター

source
IQueryable<Single>

平均値計算の対象となる Single 値のシーケンス。 A sequence of Single values to calculate the average of.

Returns

値のシーケンスの平均値。 The average of the sequence of values.

Exceptions

source に要素が含まれていません。 source contains no elements.

Examples

次のコード例は、使用する方法を示しますAverage(IQueryable<Int32>)値のシーケンスの平均を計算します。The following code example demonstrates how to use Average(IQueryable<Int32>) to calculate the average of a sequence of values.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、ソース シーケンスの要素を適切な数値型の要素に置き換えます。To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

List<int> grades = new List<int> { 78, 92, 100, 37, 81 };

double average = grades.AsQueryable().Average();

Console.WriteLine("The average grade is {0}.", average);

// This code produces the following output:
//
// The average grade is 77.6. 

Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

Dim average As Double = grades.AsQueryable().Average()

MsgBox(String.Format("The average grade is {0}.", average))

' This code produces the following output:
'
' The average grade is 77.6. 

Remarks

Average(IQueryable<Single>)メソッドを生成、MethodCallExpression呼び出しを表すAverage(IQueryable<Single>)自体。The Average(IQueryable<Single>) method generates a MethodCallExpression that represents calling Average(IQueryable<Single>) itself. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average(IQueryable<Single>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average(IQueryable<Single>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceします。The expected behavior is that it calculates the average of the values in source.

Average(IQueryable<Nullable<Single>>) Average(IQueryable<Nullable<Single>>) Average(IQueryable<Nullable<Single>>) Average(IQueryable<Nullable<Single>>)

Null 許容型の Single 値のシーケンスの平均を計算します。 Computes the average of a sequence of nullable Single values.

public:
[System::Runtime::CompilerServices::Extension]
 static Nullable<float> Average(System::Linq::IQueryable<Nullable<float>> ^ source);
public static Nullable<float> Average (this System.Linq.IQueryable<Nullable<float>> source);
static member Average : System.Linq.IQueryable<Nullable<single>> -> Nullable<single>
<Extension()>
Public Function Average (source As IQueryable(Of Nullable(Of Single))) As Nullable(Of Single)

パラメーター

source
IQueryable<Nullable<Single>>

平均を計算する Null 許容型の Single 値のシーケンス。 A sequence of nullable Single values to calculate the average of.

Returns

値のシーケンスの平均値、または、ソース シーケンスが空または null である値のみを含む場合は null The average of the sequence of values, or null if the source sequence is empty or contains only null values.

Exceptions

Examples

次のコード例は、使用する方法を示しますAverage(IQueryable<Nullable<Int64>>)値のシーケンスの平均を計算します。The following code example demonstrates how to use Average(IQueryable<Nullable<Int64>>) to calculate the average of a sequence of values.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、ソース シーケンスの要素を適切な数値型の要素に置き換えます。To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

long?[] longs = { null, 10007L, 37L, 399846234235L };

double? average = longs.AsQueryable().Average();

Console.WriteLine("The average is {0}.", average);

// This code produces the following output:
//
// The average is 133282081426.333. 

Dim longs() As Nullable(Of Long) = {Nothing, 10007L, 37L, 399846234235L}

Dim average As Nullable(Of Double) = longs.AsQueryable().Average()

MsgBox(String.Format("The average is {0}.", average))

' This code produces the following output:
'
' The average is 133282081426.333. 

Remarks

Average(IQueryable<Nullable<Single>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage(IQueryable<Nullable<Single>>)自体。The Average(IQueryable<Nullable<Single>>) method generates a MethodCallExpression that represents calling Average(IQueryable<Nullable<Single>>) itself. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average(IQueryable<Nullable<Single>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average(IQueryable<Nullable<Single>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceします。The expected behavior is that it calculates the average of the values in source.

Average(IQueryable<Nullable<Int64>>) Average(IQueryable<Nullable<Int64>>) Average(IQueryable<Nullable<Int64>>) Average(IQueryable<Nullable<Int64>>)

Null 許容型の Int64 値のシーケンスの平均を計算します。 Computes the average of a sequence of nullable Int64 values.

public:
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Linq::IQueryable<Nullable<long>> ^ source);
public static Nullable<double> Average (this System.Linq.IQueryable<Nullable<long>> source);
static member Average : System.Linq.IQueryable<Nullable<int64>> -> Nullable<double>
<Extension()>
Public Function Average (source As IQueryable(Of Nullable(Of Long))) As Nullable(Of Double)

パラメーター

source
IQueryable<Nullable<Int64>>

平均を計算する Null 許容型の Int64 値のシーケンス。 A sequence of nullable Int64 values to calculate the average of.

Returns

値のシーケンスの平均値、または、ソース シーケンスが空または null である値のみを含む場合は null The average of the sequence of values, or null if the source sequence is empty or contains only null values.

Exceptions

Examples

次のコード例は、使用する方法を示しますAverage(IQueryable<Nullable<Int64>>)値のシーケンスの平均を計算します。The following code example demonstrates how to use Average(IQueryable<Nullable<Int64>>) to calculate the average of a sequence of values.

long?[] longs = { null, 10007L, 37L, 399846234235L };

double? average = longs.AsQueryable().Average();

Console.WriteLine("The average is {0}.", average);

// This code produces the following output:
//
// The average is 133282081426.333. 

Dim longs() As Nullable(Of Long) = {Nothing, 10007L, 37L, 399846234235L}

Dim average As Nullable(Of Double) = longs.AsQueryable().Average()

MsgBox(String.Format("The average is {0}.", average))

' This code produces the following output:
'
' The average is 133282081426.333. 

Remarks

Average(IQueryable<Nullable<Int64>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage(IQueryable<Nullable<Int64>>)自体。The Average(IQueryable<Nullable<Int64>>) method generates a MethodCallExpression that represents calling Average(IQueryable<Nullable<Int64>>) itself. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average(IQueryable<Nullable<Int64>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average(IQueryable<Nullable<Int64>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceします。The expected behavior is that it calculates the average of the values in source.

Average(IQueryable<Nullable<Double>>) Average(IQueryable<Nullable<Double>>) Average(IQueryable<Nullable<Double>>) Average(IQueryable<Nullable<Double>>)

Null 許容型の Double 値のシーケンスの平均を計算します。 Computes the average of a sequence of nullable Double values.

public:
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Linq::IQueryable<Nullable<double>> ^ source);
public static Nullable<double> Average (this System.Linq.IQueryable<Nullable<double>> source);
static member Average : System.Linq.IQueryable<Nullable<double>> -> Nullable<double>
<Extension()>
Public Function Average (source As IQueryable(Of Nullable(Of Double))) As Nullable(Of Double)

パラメーター

source
IQueryable<Nullable<Double>>

平均を計算する Null 許容型の Double 値のシーケンス。 A sequence of nullable Double values to calculate the average of.

Returns

値のシーケンスの平均値、または、ソース シーケンスが空または null である値のみを含む場合は null The average of the sequence of values, or null if the source sequence is empty or contains only null values.

Exceptions

Examples

次のコード例は、使用する方法を示しますAverage(IQueryable<Nullable<Int64>>)値のシーケンスの平均を計算します。The following code example demonstrates how to use Average(IQueryable<Nullable<Int64>>) to calculate the average of a sequence of values.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、ソース シーケンスの要素を適切な数値型の要素に置き換えます。To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

long?[] longs = { null, 10007L, 37L, 399846234235L };

double? average = longs.AsQueryable().Average();

Console.WriteLine("The average is {0}.", average);

// This code produces the following output:
//
// The average is 133282081426.333. 

Dim longs() As Nullable(Of Long) = {Nothing, 10007L, 37L, 399846234235L}

Dim average As Nullable(Of Double) = longs.AsQueryable().Average()

MsgBox(String.Format("The average is {0}.", average))

' This code produces the following output:
'
' The average is 133282081426.333. 

Remarks

Average(IQueryable<Nullable<Double>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage(IQueryable<Nullable<Double>>)自体。The Average(IQueryable<Nullable<Double>>) method generates a MethodCallExpression that represents calling Average(IQueryable<Nullable<Double>>) itself. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average(IQueryable<Nullable<Double>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average(IQueryable<Nullable<Double>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceします。The expected behavior is that it calculates the average of the values in source.

Average(IQueryable<Nullable<Int32>>) Average(IQueryable<Nullable<Int32>>) Average(IQueryable<Nullable<Int32>>) Average(IQueryable<Nullable<Int32>>)

Null 許容型の Int32 値のシーケンスの平均を計算します。 Computes the average of a sequence of nullable Int32 values.

public:
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Linq::IQueryable<Nullable<int>> ^ source);
public static Nullable<double> Average (this System.Linq.IQueryable<Nullable<int>> source);
static member Average : System.Linq.IQueryable<Nullable<int>> -> Nullable<double>
<Extension()>
Public Function Average (source As IQueryable(Of Nullable(Of Integer))) As Nullable(Of Double)

パラメーター

source
IQueryable<Nullable<Int32>>

平均を計算する Null 許容型の Int32 値のシーケンス。 A sequence of nullable Int32 values to calculate the average of.

Returns

値のシーケンスの平均値、または、ソース シーケンスが空または null である値のみを含む場合は null The average of the sequence of values, or null if the source sequence is empty or contains only null values.

Exceptions

Examples

次のコード例は、使用する方法を示しますAverage(IQueryable<Nullable<Int64>>)値のシーケンスの平均を計算します。The following code example demonstrates how to use Average(IQueryable<Nullable<Int64>>) to calculate the average of a sequence of values.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、ソース シーケンスの要素を適切な数値型の要素に置き換えます。To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

long?[] longs = { null, 10007L, 37L, 399846234235L };

double? average = longs.AsQueryable().Average();

Console.WriteLine("The average is {0}.", average);

// This code produces the following output:
//
// The average is 133282081426.333. 

Dim longs() As Nullable(Of Long) = {Nothing, 10007L, 37L, 399846234235L}

Dim average As Nullable(Of Double) = longs.AsQueryable().Average()

MsgBox(String.Format("The average is {0}.", average))

' This code produces the following output:
'
' The average is 133282081426.333. 

Remarks

Average(IQueryable<Nullable<Int32>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage(IQueryable<Nullable<Int32>>)自体。The Average(IQueryable<Nullable<Int32>>) method generates a MethodCallExpression that represents calling Average(IQueryable<Nullable<Int32>>) itself. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average(IQueryable<Nullable<Int32>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average(IQueryable<Nullable<Int32>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceします。The expected behavior is that it calculates the average of the values in source.

Average(IQueryable<Int64>) Average(IQueryable<Int64>) Average(IQueryable<Int64>) Average(IQueryable<Int64>)

Int64 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Int64 values.

public:
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Linq::IQueryable<long> ^ source);
public static double Average (this System.Linq.IQueryable<long> source);
static member Average : System.Linq.IQueryable<int64> -> double
<Extension()>
Public Function Average (source As IQueryable(Of Long)) As Double

パラメーター

source
IQueryable<Int64>

平均値計算の対象となる Int64 値のシーケンス。 A sequence of Int64 values to calculate the average of.

Returns

値のシーケンスの平均値。 The average of the sequence of values.

Exceptions

source に要素が含まれていません。 source contains no elements.

Examples

次のコード例は、使用する方法を示しますAverage(IQueryable<Int32>)値のシーケンスの平均を計算します。The following code example demonstrates how to use Average(IQueryable<Int32>) to calculate the average of a sequence of values.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、ソース シーケンスの要素を適切な数値型の要素に置き換えます。To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

List<int> grades = new List<int> { 78, 92, 100, 37, 81 };

double average = grades.AsQueryable().Average();

Console.WriteLine("The average grade is {0}.", average);

// This code produces the following output:
//
// The average grade is 77.6. 

Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

Dim average As Double = grades.AsQueryable().Average()

MsgBox(String.Format("The average grade is {0}.", average))

' This code produces the following output:
'
' The average grade is 77.6. 

Remarks

Average(IQueryable<Int64>)メソッドを生成、MethodCallExpression呼び出しを表すAverage(IQueryable<Int64>)自体。The Average(IQueryable<Int64>) method generates a MethodCallExpression that represents calling Average(IQueryable<Int64>) itself. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average(IQueryable<Int64>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average(IQueryable<Int64>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceします。The expected behavior is that it calculates the average of the values in source.

Average(IQueryable<Int32>) Average(IQueryable<Int32>) Average(IQueryable<Int32>) Average(IQueryable<Int32>)

Int32 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Int32 values.

public:
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Linq::IQueryable<int> ^ source);
public static double Average (this System.Linq.IQueryable<int> source);
static member Average : System.Linq.IQueryable<int> -> double
<Extension()>
Public Function Average (source As IQueryable(Of Integer)) As Double

パラメーター

source
IQueryable<Int32>

平均値計算の対象となる Int32 値のシーケンス。 A sequence of Int32 values to calculate the average of.

Returns

値のシーケンスの平均値。 The average of the sequence of values.

Exceptions

source に要素が含まれていません。 source contains no elements.

Examples

次のコード例は、使用する方法を示しますAverage(IQueryable<Int32>)値のシーケンスの平均を計算します。The following code example demonstrates how to use Average(IQueryable<Int32>) to calculate the average of a sequence of values.

List<int> grades = new List<int> { 78, 92, 100, 37, 81 };

double average = grades.AsQueryable().Average();

Console.WriteLine("The average grade is {0}.", average);

// This code produces the following output:
//
// The average grade is 77.6. 

Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

Dim average As Double = grades.AsQueryable().Average()

MsgBox(String.Format("The average grade is {0}.", average))

' This code produces the following output:
'
' The average grade is 77.6. 

Remarks

Average(IQueryable<Int32>)メソッドを生成、MethodCallExpression呼び出しを表すAverage(IQueryable<Int32>)自体。The Average(IQueryable<Int32>) method generates a MethodCallExpression that represents calling Average(IQueryable<Int32>) itself. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average(IQueryable<Int32>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average(IQueryable<Int32>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceします。The expected behavior is that it calculates the average of the values in source.

Average(IQueryable<Double>) Average(IQueryable<Double>) Average(IQueryable<Double>) Average(IQueryable<Double>)

Double 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Double values.

public:
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Linq::IQueryable<double> ^ source);
public static double Average (this System.Linq.IQueryable<double> source);
static member Average : System.Linq.IQueryable<double> -> double
<Extension()>
Public Function Average (source As IQueryable(Of Double)) As Double

パラメーター

source
IQueryable<Double>

平均値計算の対象となる Double 値のシーケンス。 A sequence of Double values to calculate the average of.

Returns

値のシーケンスの平均値。 The average of the sequence of values.

Exceptions

source に要素が含まれていません。 source contains no elements.

Examples

次のコード例は、使用する方法を示しますAverage(IQueryable<Int32>)値のシーケンスの平均を計算します。The following code example demonstrates how to use Average(IQueryable<Int32>) to calculate the average of a sequence of values.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、ソース シーケンスの要素を適切な数値型の要素に置き換えます。To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

List<int> grades = new List<int> { 78, 92, 100, 37, 81 };

double average = grades.AsQueryable().Average();

Console.WriteLine("The average grade is {0}.", average);

// This code produces the following output:
//
// The average grade is 77.6. 

Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

Dim average As Double = grades.AsQueryable().Average()

MsgBox(String.Format("The average grade is {0}.", average))

' This code produces the following output:
'
' The average grade is 77.6. 

Remarks

Average(IQueryable<Double>)メソッドを生成、MethodCallExpression呼び出しを表すAverage(IQueryable<Double>)自体。The Average(IQueryable<Double>) method generates a MethodCallExpression that represents calling Average(IQueryable<Double>) itself. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average(IQueryable<Double>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average(IQueryable<Double>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceします。The expected behavior is that it calculates the average of the values in source.

Average(IQueryable<Decimal>) Average(IQueryable<Decimal>) Average(IQueryable<Decimal>) Average(IQueryable<Decimal>)

Decimal 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Decimal values.

public:
[System::Runtime::CompilerServices::Extension]
 static System::Decimal Average(System::Linq::IQueryable<System::Decimal> ^ source);
public static decimal Average (this System.Linq.IQueryable<decimal> source);
static member Average : System.Linq.IQueryable<decimal> -> decimal
<Extension()>
Public Function Average (source As IQueryable(Of Decimal)) As Decimal

パラメーター

source
IQueryable<Decimal>

平均値計算の対象となる Decimal 値のシーケンス。 A sequence of Decimal values to calculate the average of.

Returns

値のシーケンスの平均値。 The average of the sequence of values.

Exceptions

source に要素が含まれていません。 source contains no elements.

Examples

次のコード例は、使用する方法を示しますAverage(IQueryable<Int32>)値のシーケンスの平均を計算します。The following code example demonstrates how to use Average(IQueryable<Int32>) to calculate the average of a sequence of values.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、ソース シーケンスの要素を適切な数値型の要素に置き換えます。To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

List<int> grades = new List<int> { 78, 92, 100, 37, 81 };

double average = grades.AsQueryable().Average();

Console.WriteLine("The average grade is {0}.", average);

// This code produces the following output:
//
// The average grade is 77.6. 

Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

Dim average As Double = grades.AsQueryable().Average()

MsgBox(String.Format("The average grade is {0}.", average))

' This code produces the following output:
'
' The average grade is 77.6. 

Remarks

Average(IQueryable<Decimal>)メソッドを生成、MethodCallExpression呼び出しを表すAverage(IQueryable<Decimal>)自体。The Average(IQueryable<Decimal>) method generates a MethodCallExpression that represents calling Average(IQueryable<Decimal>) itself. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average(IQueryable<Decimal>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average(IQueryable<Decimal>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceします。The expected behavior is that it calculates the average of the values in source.

Average(IQueryable<Nullable<Decimal>>) Average(IQueryable<Nullable<Decimal>>) Average(IQueryable<Nullable<Decimal>>) Average(IQueryable<Nullable<Decimal>>)

Null 許容型の Decimal 値のシーケンスの平均を計算します。 Computes the average of a sequence of nullable Decimal values.

public:
[System::Runtime::CompilerServices::Extension]
 static Nullable<System::Decimal> Average(System::Linq::IQueryable<Nullable<System::Decimal>> ^ source);
public static Nullable<decimal> Average (this System.Linq.IQueryable<Nullable<decimal>> source);
static member Average : System.Linq.IQueryable<Nullable<decimal>> -> Nullable<decimal>
<Extension()>
Public Function Average (source As IQueryable(Of Nullable(Of Decimal))) As Nullable(Of Decimal)

パラメーター

source
IQueryable<Nullable<Decimal>>

平均を計算する Null 許容型の Decimal 値のシーケンス。 A sequence of nullable Decimal values to calculate the average of.

Returns

値のシーケンスの平均値、または、ソース シーケンスが空または null である値のみを含む場合は null The average of the sequence of values, or null if the source sequence is empty or contains only null values.

Exceptions

Examples

次のコード例は、使用する方法を示しますAverage(IQueryable<Nullable<Int64>>)値のシーケンスの平均を計算します。The following code example demonstrates how to use Average(IQueryable<Nullable<Int64>>) to calculate the average of a sequence of values.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、ソース シーケンスの要素を適切な数値型の要素に置き換えます。To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

long?[] longs = { null, 10007L, 37L, 399846234235L };

double? average = longs.AsQueryable().Average();

Console.WriteLine("The average is {0}.", average);

// This code produces the following output:
//
// The average is 133282081426.333. 

Dim longs() As Nullable(Of Long) = {Nothing, 10007L, 37L, 399846234235L}

Dim average As Nullable(Of Double) = longs.AsQueryable().Average()

MsgBox(String.Format("The average is {0}.", average))

' This code produces the following output:
'
' The average is 133282081426.333. 

Remarks

Average(IQueryable<Nullable<Decimal>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage(IQueryable<Nullable<Decimal>>)自体。The Average(IQueryable<Nullable<Decimal>>) method generates a MethodCallExpression that represents calling Average(IQueryable<Nullable<Decimal>>) itself. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average(IQueryable<Nullable<Decimal>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average(IQueryable<Nullable<Decimal>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceします。The expected behavior is that it calculates the average of the values in source.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する Single 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Single values that is obtained by invoking a projection function on each element of the input sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static float Average(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, float> ^> ^ selector);
public static float Average<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,float>> selector);
static member Average : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, single>> -> single
<Extension()>
Public Function Average(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Single))) As Single

Type Parameters

TSource

要素の型ソースします。 The type of the elements of source.

パラメーター

source
IQueryable<TSource>

平均値計算の対象となる値のシーケンス。 A sequence of values to calculate the average of.

selector
Expression<Func<TSource,Single>>

各要素に適用する射影関数。 A projection function to apply to each element.

Returns

値のシーケンスの平均値。 The average of the sequence of values.

Exceptions

source または selectornull です。 source or selector is null.

source に要素が含まれていません。 source contains no elements.

Examples

次のコード例は、使用する方法を示しますAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)平均を計算するString型の値のシーケンスの長さStringします。The following code example demonstrates how to use Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) to calculate the average String length in a sequence of values of type String.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、selector 関数の本体を変更します。To extend the example to this topic, change the body of the selector function.

string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

// Determine the average string length in the array.
double average = fruits.AsQueryable().Average(s => s.Length);

Console.WriteLine("The average string length is {0}.", average);

// This code produces the following output:
//
// The average string length is 6.5. 

Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average string length in the array.
Dim average As Double = fruits.AsQueryable().Average(Function(s) s.Length)

MsgBox(String.Format("The average string length is {0}.", average))

' This code produces the following output:
'
' The average string length is 6.5. 

Remarks

このメソッドは、少なくとも 1 つのパラメーター型のExpression<TDelegate>型引数は、のいずれか、Func<T,TResult>型。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. ラムダ式で、これらのパラメーターを渡すことができますにコンパイルされると、Expression<TDelegate>します。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>)として構築されたジェネリック メソッド自体。The Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>) method generates a MethodCallExpression that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>) itself as a constructed generic method. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Single>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceを呼び出した後selectorの各値にします。The expected behavior is that it calculates the average of the values in source after invoking selector on each value.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する、null 許容の Single 値のシーケンスの平均値を計算します。 Computes the average of a sequence of nullable Single values that is obtained by invoking a projection function on each element of the input sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static Nullable<float> Average(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, Nullable<float>> ^> ^ selector);
public static Nullable<float> Average<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<float>>> selector);
static member Average : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<single>>> -> Nullable<single>
<Extension()>
Public Function Average(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Nullable(Of Single)))) As Nullable(Of Single)

Type Parameters

TSource

要素の型ソースします。 The type of the elements of source.

パラメーター

source
IQueryable<TSource>

平均値計算の対象となる値のシーケンス。 A sequence of values to calculate the average of.

selector
Expression<Func<TSource,Nullable<Single>>>

各要素に適用する射影関数。 A projection function to apply to each element.

Returns

値のシーケンスの平均値。source シーケンスが空か null 値のみを含む場合は null The average of the sequence of values, or null if the source sequence is empty or contains only null values.

Exceptions

source または selectornull です。 source or selector is null.

Examples

次のコード例は、使用する方法を示しますAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)平均を計算するString型の値のシーケンスの長さStringします。The following code example demonstrates how to use Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) to calculate the average String length in a sequence of values of type String.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、selector 関数の本体を変更します。To extend the example to this topic, change the body of the selector function.

string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

// Determine the average string length in the array.
double average = fruits.AsQueryable().Average(s => s.Length);

Console.WriteLine("The average string length is {0}.", average);

// This code produces the following output:
//
// The average string length is 6.5. 

Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average string length in the array.
Dim average As Double = fruits.AsQueryable().Average(Function(s) s.Length)

MsgBox(String.Format("The average string length is {0}.", average))

' This code produces the following output:
'
' The average string length is 6.5. 

Remarks

このメソッドは、少なくとも 1 つのパラメーター型のExpression<TDelegate>型引数は、のいずれか、Func<T,TResult>型。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. ラムダ式で、これらのパラメーターを渡すことができますにコンパイルされると、Expression<TDelegate>します。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>)として構築されたジェネリック メソッド自体。The Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>) method generates a MethodCallExpression that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>) itself as a constructed generic method. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表されるProviderのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Single>>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceを呼び出した後selectorの各値にします。The expected behavior is that it calculates the average of the values in source after invoking selector on each value.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する、null 許容の Int64 値のシーケンスの平均値を計算します。 Computes the average of a sequence of nullable Int64 values that is obtained by invoking a projection function on each element of the input sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, Nullable<long>> ^> ^ selector);
public static Nullable<double> Average<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<long>>> selector);
static member Average : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<int64>>> -> Nullable<double>
<Extension()>
Public Function Average(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Nullable(Of Long)))) As Nullable(Of Double)

Type Parameters

TSource

要素の型ソースします。 The type of the elements of source.

パラメーター

source
IQueryable<TSource>

平均値計算の対象となる値のシーケンス。 A sequence of values to calculate the average of.

selector
Expression<Func<TSource,Nullable<Int64>>>

各要素に適用する射影関数。 A projection function to apply to each element.

Returns

値のシーケンスの平均値。source シーケンスが空か null 値のみを含む場合は null The average of the sequence of values, or null if the source sequence is empty or contains only null values.

Exceptions

source または selectornull です。 source or selector is null.

Examples

次のコード例は、使用する方法を示しますAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)平均を計算するString型の値のシーケンスの長さStringします。The following code example demonstrates how to use Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) to calculate the average String length in a sequence of values of type String.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、selector 関数の本体を変更します。To extend the example to this topic, change the body of the selector function.

string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

// Determine the average string length in the array.
double average = fruits.AsQueryable().Average(s => s.Length);

Console.WriteLine("The average string length is {0}.", average);

// This code produces the following output:
//
// The average string length is 6.5. 

Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average string length in the array.
Dim average As Double = fruits.AsQueryable().Average(Function(s) s.Length)

MsgBox(String.Format("The average string length is {0}.", average))

' This code produces the following output:
'
' The average string length is 6.5. 

Remarks

このメソッドは、少なくとも 1 つのパラメーター型のExpression<TDelegate>型引数は、のいずれか、Func<T,TResult>型。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. ラムダ式で、これらのパラメーターを渡すことができますにコンパイルされると、Expression<TDelegate>します。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>)として構築されたジェネリック メソッド自体。The Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>) method generates a MethodCallExpression that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>) itself as a constructed generic method. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int64>>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceを呼び出した後selectorの各値にします。The expected behavior is that it calculates the average of the values in source after invoking selector on each value.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する、null 許容の Int32 値のシーケンスの平均値を計算します。 Computes the average of a sequence of nullable Int32 values that is obtained by invoking a projection function on each element of the input sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, Nullable<int>> ^> ^ selector);
public static Nullable<double> Average<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<int>>> selector);
static member Average : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<int>>> -> Nullable<double>
<Extension()>
Public Function Average(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Nullable(Of Integer)))) As Nullable(Of Double)

Type Parameters

TSource

要素の型ソースします。 The type of the elements of source.

パラメーター

source
IQueryable<TSource>

平均値計算の対象となる値のシーケンス。 A sequence of values to calculate the average of.

selector
Expression<Func<TSource,Nullable<Int32>>>

各要素に適用する射影関数。 A projection function to apply to each element.

Returns

値のシーケンスの平均値。source シーケンスが空か null 値のみを含む場合は null The average of the sequence of values, or null if the source sequence is empty or contains only null values.

Exceptions

source または selectornull です。 source or selector is null.

Examples

次のコード例は、使用する方法を示しますAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)平均を計算するString型の値のシーケンスの長さStringします。The following code example demonstrates how to use Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) to calculate the average String length in a sequence of values of type String.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、selector 関数の本体を変更します。To extend the example to this topic, change the body of the selector function.

string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

// Determine the average string length in the array.
double average = fruits.AsQueryable().Average(s => s.Length);

Console.WriteLine("The average string length is {0}.", average);

// This code produces the following output:
//
// The average string length is 6.5. 

Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average string length in the array.
Dim average As Double = fruits.AsQueryable().Average(Function(s) s.Length)

MsgBox(String.Format("The average string length is {0}.", average))

' This code produces the following output:
'
' The average string length is 6.5. 

Remarks

このメソッドは、少なくとも 1 つのパラメーター型のExpression<TDelegate>型引数は、のいずれか、Func<T,TResult>型。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. ラムダ式で、これらのパラメーターを渡すことができますにコンパイルされると、Expression<TDelegate>します。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>)として構築されたジェネリック メソッド自体。The Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>) method generates a MethodCallExpression that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>) itself as a constructed generic method. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表されるProviderのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Int32>>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceを呼び出した後selectorの各値にします。The expected behavior is that it calculates the average of the values in source after invoking selector on each value.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する、null 許容の Double 値のシーケンスの平均値を計算します。 Computes the average of a sequence of nullable Double values that is obtained by invoking a projection function on each element of the input sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, Nullable<double>> ^> ^ selector);
public static Nullable<double> Average<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<double>>> selector);
static member Average : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<double>>> -> Nullable<double>
<Extension()>
Public Function Average(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Nullable(Of Double)))) As Nullable(Of Double)

Type Parameters

TSource

要素の型ソースします。 The type of the elements of source.

パラメーター

source
IQueryable<TSource>

平均値計算の対象となる値のシーケンス。 A sequence of values to calculate the average of.

selector
Expression<Func<TSource,Nullable<Double>>>

各要素に適用する射影関数。 A projection function to apply to each element.

Returns

値のシーケンスの平均値。source シーケンスが空か null 値のみを含む場合は null The average of the sequence of values, or null if the source sequence is empty or contains only null values.

Exceptions

source または selectornull です。 source or selector is null.

Examples

次のコード例は、使用する方法を示しますAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)平均を計算するString型の値のシーケンスの長さStringします。The following code example demonstrates how to use Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) to calculate the average String length in a sequence of values of type String.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、selector 関数の本体を変更します。To extend the example to this topic, change the body of the selector function.

string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

// Determine the average string length in the array.
double average = fruits.AsQueryable().Average(s => s.Length);

Console.WriteLine("The average string length is {0}.", average);

// This code produces the following output:
//
// The average string length is 6.5. 

Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average string length in the array.
Dim average As Double = fruits.AsQueryable().Average(Function(s) s.Length)

MsgBox(String.Format("The average string length is {0}.", average))

' This code produces the following output:
'
' The average string length is 6.5. 

Remarks

このメソッドは、少なくとも 1 つのパラメーター型のExpression<TDelegate>型引数は、のいずれか、Func<T,TResult>型。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. ラムダ式で、これらのパラメーターを渡すことができますにコンパイルされると、Expression<TDelegate>します。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>)として構築されたジェネリック メソッド自体。The Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>) method generates a MethodCallExpression that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>) itself as a constructed generic method. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Double>>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceを呼び出した後selectorの各値にします。The expected behavior is that it calculates the average of the values in source after invoking selector on each value.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する Int64 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Int64 values that is obtained by invoking a projection function on each element of the input sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, long> ^> ^ selector);
public static double Average<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,long>> selector);
static member Average : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, int64>> -> double
<Extension()>
Public Function Average(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Long))) As Double

Type Parameters

TSource

要素の型ソースします。 The type of the elements of source.

パラメーター

source
IQueryable<TSource>

平均値計算の対象となる値のシーケンス。 A sequence of values to calculate the average of.

selector
Expression<Func<TSource,Int64>>

各要素に適用する射影関数。 A projection function to apply to each element.

Returns

値のシーケンスの平均値。 The average of the sequence of values.

Exceptions

source または selectornull です。 source or selector is null.

source に要素が含まれていません。 source contains no elements.

Examples

次のコード例は、使用する方法を示しますAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)平均を計算するString型の値のシーケンスの長さStringします。The following code example demonstrates how to use Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) to calculate the average String length in a sequence of values of type String.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、selector 関数の本体を変更します。To extend the example to this topic, change the body of the selector function.

string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

// Determine the average string length in the array.
double average = fruits.AsQueryable().Average(s => s.Length);

Console.WriteLine("The average string length is {0}.", average);

// This code produces the following output:
//
// The average string length is 6.5. 

Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average string length in the array.
Dim average As Double = fruits.AsQueryable().Average(Function(s) s.Length)

MsgBox(String.Format("The average string length is {0}.", average))

' This code produces the following output:
'
' The average string length is 6.5. 

Remarks

このメソッドは、少なくとも 1 つのパラメーター型のExpression<TDelegate>型引数は、のいずれか、Func<T,TResult>型。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. ラムダ式で、これらのパラメーターを渡すことができますにコンパイルされると、Expression<TDelegate>します。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>)として構築されたジェネリック メソッド自体。The Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>) method generates a MethodCallExpression that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>) itself as a constructed generic method. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int64>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceを呼び出した後selectorの各値にします。The expected behavior is that it calculates the average of the values in source after invoking selector on each value.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する Int32 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Int32 values that is obtained by invoking a projection function on each element of the input sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, int> ^> ^ selector);
public static double Average<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,int>> selector);
static member Average : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, int>> -> double
<Extension()>
Public Function Average(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Integer))) As Double

Type Parameters

TSource

要素の型ソースします。 The type of the elements of source.

パラメーター

source
IQueryable<TSource>

平均値計算の対象となる値のシーケンス。 A sequence of values to calculate the average of.

selector
Expression<Func<TSource,Int32>>

各要素に適用する射影関数。 A projection function to apply to each element.

Returns

値のシーケンスの平均値。 The average of the sequence of values.

Exceptions

source または selectornull です。 source or selector is null.

source に要素が含まれていません。 source contains no elements.

Examples

次のコード例は、使用する方法を示しますAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)平均を計算するString型の値のシーケンスの長さStringします。The following code example demonstrates how to use Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) to calculate the average String length in a sequence of values of type String.

string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

// Determine the average string length in the array.
double average = fruits.AsQueryable().Average(s => s.Length);

Console.WriteLine("The average string length is {0}.", average);

// This code produces the following output:
//
// The average string length is 6.5. 

Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average string length in the array.
Dim average As Double = fruits.AsQueryable().Average(Function(s) s.Length)

MsgBox(String.Format("The average string length is {0}.", average))

' This code produces the following output:
'
' The average string length is 6.5. 

Remarks

このメソッドは、少なくとも 1 つのパラメーター型のExpression<TDelegate>型引数は、のいずれか、Func<T,TResult>型。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. ラムダ式で、これらのパラメーターを渡すことができますにコンパイルされると、Expression<TDelegate>します。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)として構築されたジェネリック メソッド自体。The Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) method generates a MethodCallExpression that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) itself as a constructed generic method. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceを呼び出した後selectorの各値にします。The expected behavior is that it calculates the average of the values in source after invoking selector on each value.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する Double 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Double values that is obtained by invoking a projection function on each element of the input sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, double> ^> ^ selector);
public static double Average<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,double>> selector);
static member Average : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, double>> -> double
<Extension()>
Public Function Average(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Double))) As Double

Type Parameters

TSource

要素の型ソースします。 The type of the elements of source.

パラメーター

source
IQueryable<TSource>

平均値計算の対象となる値のシーケンス。 A sequence of values to calculate the average of.

selector
Expression<Func<TSource,Double>>

各要素に適用する射影関数。 A projection function to apply to each element.

Returns

値のシーケンスの平均値。 The average of the sequence of values.

Exceptions

source または selectornull です。 source or selector is null.

source に要素が含まれていません。 source contains no elements.

Examples

次のコード例は、使用する方法を示しますAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)平均を計算するString型の値のシーケンスの長さStringします。The following code example demonstrates how to use Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) to calculate the average String length in a sequence of values of type String.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、selector 関数の本体を変更します。To extend the example to this topic, change the body of the selector function.

string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

// Determine the average string length in the array.
double average = fruits.AsQueryable().Average(s => s.Length);

Console.WriteLine("The average string length is {0}.", average);

// This code produces the following output:
//
// The average string length is 6.5. 

Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average string length in the array.
Dim average As Double = fruits.AsQueryable().Average(Function(s) s.Length)

MsgBox(String.Format("The average string length is {0}.", average))

' This code produces the following output:
'
' The average string length is 6.5. 

Remarks

このメソッドは、少なくとも 1 つのパラメーター型のExpression<TDelegate>型引数は、のいずれか、Func<T,TResult>型。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. ラムダ式で、これらのパラメーターを渡すことができますにコンパイルされると、Expression<TDelegate>します。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>)として構築されたジェネリック メソッド自体。The Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>) method generates a MethodCallExpression that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>) itself as a constructed generic method. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Double>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceを呼び出した後selectorの各値にします。The expected behavior is that it calculates the average of the values in source after invoking selector on each value.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する Decimal 値のシーケンスの平均値を計算します。 Computes the average of a sequence of Decimal values that is obtained by invoking a projection function on each element of the input sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static System::Decimal Average(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, System::Decimal> ^> ^ selector);
public static decimal Average<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,decimal>> selector);
static member Average : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, decimal>> -> decimal
<Extension()>
Public Function Average(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Decimal))) As Decimal

Type Parameters

TSource

要素の型ソースします。 The type of the elements of source.

パラメーター

source
IQueryable<TSource>

平均値の計算に使用される値のシーケンス。 A sequence of values that are used to calculate an average.

selector
Expression<Func<TSource,Decimal>>

各要素に適用する射影関数。 A projection function to apply to each element.

Returns

値のシーケンスの平均値。 The average of the sequence of values.

Exceptions

source または selectornull です。 source or selector is null.

source に要素が含まれていません。 source contains no elements.

Examples

次のコード例は、使用する方法を示しますAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)平均を計算するString型の値のシーケンスの長さStringします。The following code example demonstrates how to use Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) to calculate the average String length in a sequence of values of type String.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、selector 関数の本体を変更します。To extend the example to this topic, change the body of the selector function.

string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

// Determine the average string length in the array.
double average = fruits.AsQueryable().Average(s => s.Length);

Console.WriteLine("The average string length is {0}.", average);

// This code produces the following output:
//
// The average string length is 6.5. 

Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average string length in the array.
Dim average As Double = fruits.AsQueryable().Average(Function(s) s.Length)

MsgBox(String.Format("The average string length is {0}.", average))

' This code produces the following output:
'
' The average string length is 6.5. 

Remarks

このメソッドは、少なくとも 1 つのパラメーター型のExpression<TDelegate>型引数は、のいずれか、Func<T,TResult>型。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. ラムダ式で、これらのパラメーターを渡すことができますにコンパイルされると、Expression<TDelegate>します。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>)として構築されたジェネリック メソッド自体。The Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>) method generates a MethodCallExpression that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>) itself as a constructed generic method. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Decimal>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceを呼び出した後selectorの各値にします。The expected behavior is that it calculates the average of the values in source after invoking selector on each value.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>) Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>)

入力シーケンスの各要素に対して射影関数を呼び出して取得する、null 許容の Decimal 値のシーケンスの平均値を計算します。 Computes the average of a sequence of nullable Decimal values that is obtained by invoking a projection function on each element of the input sequence.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static Nullable<System::Decimal> Average(System::Linq::IQueryable<TSource> ^ source, System::Linq::Expressions::Expression<Func<TSource, Nullable<System::Decimal>> ^> ^ selector);
public static Nullable<decimal> Average<TSource> (this System.Linq.IQueryable<TSource> source, System.Linq.Expressions.Expression<Func<TSource,Nullable<decimal>>> selector);
static member Average : System.Linq.IQueryable<'Source> * System.Linq.Expressions.Expression<Func<'Source, Nullable<decimal>>> -> Nullable<decimal>
<Extension()>
Public Function Average(Of TSource) (source As IQueryable(Of TSource), selector As Expression(Of Func(Of TSource, Nullable(Of Decimal)))) As Nullable(Of Decimal)

Type Parameters

TSource

要素の型ソースします。 The type of the elements of source.

パラメーター

source
IQueryable<TSource>

平均値計算の対象となる値のシーケンス。 A sequence of values to calculate the average of.

selector
Expression<Func<TSource,Nullable<Decimal>>>

各要素に適用する射影関数。 A projection function to apply to each element.

Returns

値のシーケンスの平均値。source シーケンスが空か null 値のみを含む場合は null The average of the sequence of values, or null if the source sequence is empty or contains only null values.

Exceptions

source または selectornull です。 source or selector is null.

Examples

次のコード例は、使用する方法を示しますAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>)平均を計算するString型の値のシーケンスの長さStringします。The following code example demonstrates how to use Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Int32>>) to calculate the average String length in a sequence of values of type String.

注意

このコード例で使用するオーバーロードされたメソッドのオーバーロードは、このトピックで説明する特定のオーバーロードとは異なります。This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. コード例をこのトピックに適用するには、selector 関数の本体を変更します。To extend the example to this topic, change the body of the selector function.

string[] fruits = { "apple", "banana", "mango", "orange", "passionfruit", "grape" };

// Determine the average string length in the array.
double average = fruits.AsQueryable().Average(s => s.Length);

Console.WriteLine("The average string length is {0}.", average);

// This code produces the following output:
//
// The average string length is 6.5. 

Dim fruits() As String = {"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average string length in the array.
Dim average As Double = fruits.AsQueryable().Average(Function(s) s.Length)

MsgBox(String.Format("The average string length is {0}.", average))

' This code produces the following output:
'
' The average string length is 6.5. 

Remarks

このメソッドは、少なくとも 1 つのパラメーター型のExpression<TDelegate>型引数は、のいずれか、Func<T,TResult>型。This method has at least one parameter of type Expression<TDelegate> whose type argument is one of the Func<T,TResult> types. ラムダ式で、これらのパラメーターを渡すことができますにコンパイルされると、Expression<TDelegate>します。For these parameters, you can pass in a lambda expression and it will be compiled to an Expression<TDelegate>.

Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>)メソッドを生成、MethodCallExpression呼び出しを表すAverage<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>)として構築されたジェネリック メソッド自体。The Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>) method generates a MethodCallExpression that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>) itself as a constructed generic method. これは、後、渡します、MethodCallExpressionExecute<TResult>(Expression)のメソッド、IQueryProviderによって表される、Providerのプロパティ、sourceパラメーター。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.

呼び出し元を表す式ツリーを実行した結果として発生するクエリの動作Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>)の型の実装によって異なります、sourceパラメーター。The query behavior that occurs as a result of executing an expression tree that represents calling Average<TSource>(IQueryable<TSource>, Expression<Func<TSource,Nullable<Decimal>>>) depends on the implementation of the type of the source parameter. 想定される動作は内の値の平均を計算するsourceを呼び出した後selectorの各値にします。The expected behavior is that it calculates the average of the values in source after invoking selector on each value.

Applies to