Enumerable.Average メソッド

public:
[System::Runtime::CompilerServices::Extension]
 static float Average(System::Collections::Generic::IEnumerable<float> ^ source);

public static float Average (this System.Collections.Generic.IEnumerable<float> source);

static member Average : seq<single> -> single

<Extension()>
Public Function Average (source As IEnumerable(Of Single)) As Single

パラメーター

戻り値

Single

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

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average(IEnumerable<Int32>) います。The following code example demonstrates how to use Average(IEnumerable<Int32>) to calculate an average.

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

double average = grades.Average();

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

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

' Create a list of integers.
Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

' Determine the average value in the list.
Dim avg As Double = grades.Average()

' Display the output.
Console.WriteLine($"The average grade is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
[System::Runtime::CompilerServices::Extension]
 static Nullable<float> Average(System::Collections::Generic::IEnumerable<Nullable<float>> ^ source);

public static float? Average (this System.Collections.Generic.IEnumerable<Nullable<float>> source);

static member Average : seq<Nullable<single>> -> Nullable<single>

<Extension()>
Public Function Average (source As IEnumerable(Of Nullable(Of Single))) As Nullable(Of Single)

パラメーター

戻り値

Nullable<Single>

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 values that are null.

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average(IEnumerable<Nullable<Int64>>) います。The following code example demonstrates how to use Average(IEnumerable<Nullable<Int64>>) to calculate an average.

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

double? average = longs.Average();

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

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

' Create an array of nullable long values.
Dim longs() As Nullable(Of Long) = {Nothing, 10007L, 37L, 399846234235L}

' Determine the average value in the array.
Dim avg As Nullable(Of Double) = longs.Average()

' Display the output.
Console.WriteLine($"The average is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Collections::Generic::IEnumerable<Nullable<long>> ^ source);

public static double? Average (this System.Collections.Generic.IEnumerable<Nullable<long>> source);

static member Average : seq<Nullable<int64>> -> Nullable<double>

<Extension()>
Public Function Average (source As IEnumerable(Of Nullable(Of Long))) As Nullable(Of Double)

パラメーター

戻り値

Nullable<Double>

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 values that are null.

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average(IEnumerable<Nullable<Int64>>) います。The following code example demonstrates how to use Average(IEnumerable<Nullable<Int64>>) to calculate an average.

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

double? average = longs.Average();

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

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

' Create an array of nullable long values.
Dim longs() As Nullable(Of Long) = {Nothing, 10007L, 37L, 399846234235L}

' Determine the average value in the array.
Dim avg As Nullable(Of Double) = longs.Average()

' Display the output.
Console.WriteLine($"The average is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Collections::Generic::IEnumerable<Nullable<int>> ^ source);

public static double? Average (this System.Collections.Generic.IEnumerable<Nullable<int>> source);

static member Average : seq<Nullable<int>> -> Nullable<double>

<Extension()>
Public Function Average (source As IEnumerable(Of Nullable(Of Integer))) As Nullable(Of Double)

パラメーター

戻り値

Nullable<Double>

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 values that are null.

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average(IEnumerable<Nullable<Int64>>) います。The following code example demonstrates how to use Average(IEnumerable<Nullable<Int64>>) to calculate an average.

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

double? average = longs.Average();

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

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

' Create an array of nullable long values.
Dim longs() As Nullable(Of Long) = {Nothing, 10007L, 37L, 399846234235L}

' Determine the average value in the array.
Dim avg As Nullable(Of Double) = longs.Average()

' Display the output.
Console.WriteLine($"The average is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Collections::Generic::IEnumerable<Nullable<double>> ^ source);

public static double? Average (this System.Collections.Generic.IEnumerable<Nullable<double>> source);

static member Average : seq<Nullable<double>> -> Nullable<double>

<Extension()>
Public Function Average (source As IEnumerable(Of Nullable(Of Double))) As Nullable(Of Double)

パラメーター

戻り値

Nullable<Double>

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 values that are null.

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average(IEnumerable<Nullable<Int64>>) います。The following code example demonstrates how to use Average(IEnumerable<Nullable<Int64>>) to calculate an average.

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

double? average = longs.Average();

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

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

' Create an array of nullable long values.
Dim longs() As Nullable(Of Long) = {Nothing, 10007L, 37L, 399846234235L}

' Determine the average value in the array.
Dim avg As Nullable(Of Double) = longs.Average()

' Display the output.
Console.WriteLine($"The average is {avg}")

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

注釈

要素の合計がを表すには大きすぎる場合 Double 、このメソッドは正または負の無限大を返します。If the sum of the elements is too large to represent as a Double, this method returns positive or negative infinity.

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Collections::Generic::IEnumerable<long> ^ source);

public static double Average (this System.Collections.Generic.IEnumerable<long> source);

static member Average : seq<int64> -> double

<Extension()>
Public Function Average (source As IEnumerable(Of Long)) As Double

パラメーター

戻り値

Double

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

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average(IEnumerable<Int32>) います。The following code example demonstrates how to use Average(IEnumerable<Int32>) to calculate an average.

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

double average = grades.Average();

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

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

' Create a list of integers.
Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

' Determine the average value in the list.
Dim avg As Double = grades.Average()

' Display the output.
Console.WriteLine($"The average grade is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Collections::Generic::IEnumerable<int> ^ source);

public static double Average (this System.Collections.Generic.IEnumerable<int> source);

static member Average : seq<int> -> double

<Extension()>
Public Function Average (source As IEnumerable(Of Integer)) As Double

パラメーター

戻り値

Double

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

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average(IEnumerable<Int32>) います。The following code example demonstrates how to use Average(IEnumerable<Int32>) to calculate an average.

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

double average = grades.Average();

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

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

' Create a list of integers.
Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

' Determine the average value in the list.
Dim avg As Double = grades.Average()

' Display the output.
Console.WriteLine($"The average grade is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Collections::Generic::IEnumerable<double> ^ source);

public static double Average (this System.Collections.Generic.IEnumerable<double> source);

static member Average : seq<double> -> double

<Extension()>
Public Function Average (source As IEnumerable(Of Double)) As Double

パラメーター

戻り値

Double

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

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average(IEnumerable<Int32>) います。The following code example demonstrates how to use Average(IEnumerable<Int32>) to calculate an average.

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

double average = grades.Average();

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

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

' Create a list of integers.
Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

' Determine the average value in the list.
Dim avg As Double = grades.Average()

' Display the output.
Console.WriteLine($"The average grade is {avg}")

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

注釈

要素の合計がを表すには大きすぎる場合 Double 、このメソッドは正または負の無限大を返します。If the sum of the elements is too large to represent as a Double, this method returns positive or negative infinity.

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
[System::Runtime::CompilerServices::Extension]
 static System::Decimal Average(System::Collections::Generic::IEnumerable<System::Decimal> ^ source);

public static decimal Average (this System.Collections.Generic.IEnumerable<decimal> source);

static member Average : seq<decimal> -> decimal

<Extension()>
Public Function Average (source As IEnumerable(Of Decimal)) As Decimal

パラメーター

戻り値

Decimal

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

例外

例

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

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

double average = grades.Average();

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

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

' Create a list of integers.
Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

' Determine the average value in the list.
Dim avg As Double = grades.Average()

' Display the output.
Console.WriteLine($"The average grade is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
[System::Runtime::CompilerServices::Extension]
 static Nullable<System::Decimal> Average(System::Collections::Generic::IEnumerable<Nullable<System::Decimal>> ^ source);

public static decimal? Average (this System.Collections.Generic.IEnumerable<Nullable<decimal>> source);

static member Average : seq<Nullable<decimal>> -> Nullable<decimal>

<Extension()>
Public Function Average (source As IEnumerable(Of Nullable(Of Decimal))) As Nullable(Of Decimal)

パラメーター

戻り値

Nullable<Decimal>

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 values that are null.

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average(IEnumerable<Nullable<Int64>>) います。The following code example demonstrates how to use Average(IEnumerable<Nullable<Int64>>) to calculate an average.

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

double? average = longs.Average();

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

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

' Create an array of nullable long values.
Dim longs() As Nullable(Of Long) = {Nothing, 10007L, 37L, 399846234235L}

' Determine the average value in the array.
Dim avg As Nullable(Of Double) = longs.Average()

' Display the output.
Console.WriteLine($"The average is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, Nullable<int>> ^ selector);

public static double? Average<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,Nullable<int>> selector);

static member Average : seq<'Source> * Func<'Source, Nullable<int>> -> Nullable<double>

<Extension()>
Public Function Average(Of TSource) (source As IEnumerable(Of TSource), selector As Func(Of TSource, Nullable(Of Integer))) As Nullable(Of Double)

型パラメーター

パラメーター

戻り値

Nullable<Double>

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 values that are null.

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>) います。The following code example demonstrates how to use Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>) to calculate an average.

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

double average = fruits.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.

' Create an array of strings.
Dim fruits() As String =
{"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average length of the strings in the array.
Dim avg As Double = fruits.Average(Function(s) s.Length)

' Display the output.
Console.WriteLine($"The average string length is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static float Average(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, float> ^ selector);

public static float Average<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,float> selector);

static member Average : seq<'Source> * Func<'Source, single> -> single

<Extension()>
Public Function Average(Of TSource) (source As IEnumerable(Of TSource), selector As Func(Of TSource, Single)) As Single

型パラメーター

パラメーター

戻り値

Single

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

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>) います。The following code example demonstrates how to use Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>) to calculate an average.

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

double average = fruits.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.

' Create an array of strings.
Dim fruits() As String =
{"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average length of the strings in the array.
Dim avg As Double = fruits.Average(Function(s) s.Length)

' Display the output.
Console.WriteLine($"The average string length is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static Nullable<float> Average(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, Nullable<float>> ^ selector);

public static float? Average<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,Nullable<float>> selector);

static member Average : seq<'Source> * Func<'Source, Nullable<single>> -> Nullable<single>

<Extension()>
Public Function Average(Of TSource) (source As IEnumerable(Of TSource), selector As Func(Of TSource, Nullable(Of Single))) As Nullable(Of Single)

型パラメーター

パラメーター

戻り値

Nullable<Single>

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 values that are null.

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>) います。The following code example demonstrates how to use Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>) to calculate an average.

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

double average = fruits.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.

' Create an array of strings.
Dim fruits() As String =
{"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average length of the strings in the array.
Dim avg As Double = fruits.Average(Function(s) s.Length)

' Display the output.
Console.WriteLine($"The average string length is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, Nullable<long>> ^ selector);

public static double? Average<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,Nullable<long>> selector);

static member Average : seq<'Source> * Func<'Source, Nullable<int64>> -> Nullable<double>

<Extension()>
Public Function Average(Of TSource) (source As IEnumerable(Of TSource), selector As Func(Of TSource, Nullable(Of Long))) As Nullable(Of Double)

型パラメーター

パラメーター

戻り値

Nullable<Double>

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 values that are null.

例

次のコード例は、を使用して平均を計算する方法を示して Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) います。The following code example demonstrates how to use Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) to calculate an average.

string[] numbers = { "10007", "37", "299846234235" };

double average = numbers.Average(num => Convert.ToInt64(num));

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

// This code produces the following output:
//
// The average is 99948748093.

' Create an array of strings.
Dim numbers() As String = {"10007", "37", "299846234235"}

' Determine the average number after converting each
' string to an Int64 value.
Dim avg As Double =
numbers.Average(Function(number) Convert.ToInt64(number))

' Display the output.
Console.WriteLine($"The average is {avg}")

' This code produces the following output:
'
' The average is 99948748093

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static Nullable<double> Average(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, Nullable<double>> ^ selector);

public static double? Average<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,Nullable<double>> selector);

static member Average : seq<'Source> * Func<'Source, Nullable<double>> -> Nullable<double>

<Extension()>
Public Function Average(Of TSource) (source As IEnumerable(Of TSource), selector As Func(Of TSource, Nullable(Of Double))) As Nullable(Of Double)

型パラメーター

パラメーター

戻り値

Nullable<Double>

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 values that are null.

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) います。The following code example demonstrates how to use Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) to calculate an average.

string[] numbers = { "10007", "37", "299846234235" };

double average = numbers.Average(num => Convert.ToInt64(num));

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

// This code produces the following output:
//
// The average is 99948748093.

' Create an array of strings.
Dim numbers() As String = {"10007", "37", "299846234235"}

' Determine the average number after converting each
' string to an Int64 value.
Dim avg As Double =
numbers.Average(Function(number) Convert.ToInt64(number))

' Display the output.
Console.WriteLine($"The average is {avg}")

' This code produces the following output:
'
' The average is 99948748093

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static Nullable<System::Decimal> Average(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, Nullable<System::Decimal>> ^ selector);

public static decimal? Average<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,Nullable<decimal>> selector);

static member Average : seq<'Source> * Func<'Source, Nullable<decimal>> -> Nullable<decimal>

<Extension()>
Public Function Average(Of TSource) (source As IEnumerable(Of TSource), selector As Func(Of TSource, Nullable(Of Decimal))) As Nullable(Of Decimal)

型パラメーター

パラメーター

戻り値

Nullable<Decimal>

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 values that are null.

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) います。The following code example demonstrates how to use Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) to calculate an average.

string[] numbers = { "10007", "37", "299846234235" };

double average = numbers.Average(num => Convert.ToInt64(num));

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

// This code produces the following output:
//
// The average is 99948748093.

' Create an array of strings.
Dim numbers() As String = {"10007", "37", "299846234235"}

' Determine the average number after converting each
' string to an Int64 value.
Dim avg As Double =
numbers.Average(Function(number) Convert.ToInt64(number))

' Display the output.
Console.WriteLine($"The average is {avg}")

' This code produces the following output:
'
' The average is 99948748093

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, long> ^ selector);

public static double Average<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,long> selector);

static member Average : seq<'Source> * Func<'Source, int64> -> double

<Extension()>
Public Function Average(Of TSource) (source As IEnumerable(Of TSource), selector As Func(Of TSource, Long)) As Double

型パラメーター

パラメーター

戻り値

Double

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

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) います。The following code example demonstrates how to use Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) to calculate an average.

string[] numbers = { "10007", "37", "299846234235" };

double average = numbers.Average(num => Convert.ToInt64(num));

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

// This code produces the following output:
//
// The average is 99948748093.

' Create an array of strings.
Dim numbers() As String = {"10007", "37", "299846234235"}

' Determine the average number after converting each
' string to an Int64 value.
Dim avg As Double =
numbers.Average(Function(number) Convert.ToInt64(number))

' Display the output.
Console.WriteLine($"The average is {avg}")

' This code produces the following output:
'
' The average is 99948748093

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, int> ^ selector);

public static double Average<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,int> selector);

static member Average : seq<'Source> * Func<'Source, int> -> double

<Extension()>
Public Function Average(Of TSource) (source As IEnumerable(Of TSource), selector As Func(Of TSource, Integer)) As Double

型パラメーター

パラメーター

戻り値

Double

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

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>) います。The following code example demonstrates how to use Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>) to calculate an average.

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

double average = fruits.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.

' Create an array of strings.
Dim fruits() As String =
{"apple", "banana", "mango", "orange", "passionfruit", "grape"}

' Determine the average length of the strings in the array.
Dim avg As Double = fruits.Average(Function(s) s.Length)

' Display the output.
Console.WriteLine($"The average string length is {avg}")

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

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static double Average(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, double> ^ selector);

public static double Average<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,double> selector);

static member Average : seq<'Source> * Func<'Source, double> -> double

<Extension()>
Public Function Average(Of TSource) (source As IEnumerable(Of TSource), selector As Func(Of TSource, Double)) As Double

型パラメーター

パラメーター

戻り値

Double

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

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) います。The following code example demonstrates how to use Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) to calculate an average.

string[] numbers = { "10007", "37", "299846234235" };

double average = numbers.Average(num => Convert.ToInt64(num));

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

// This code produces the following output:
//
// The average is 99948748093.

' Create an array of strings.
Dim numbers() As String = {"10007", "37", "299846234235"}

' Determine the average number after converting each
' string to an Int64 value.
Dim avg As Double =
numbers.Average(Function(number) Convert.ToInt64(number))

' Display the output.
Console.WriteLine($"The average is {avg}")

' This code produces the following output:
'
' The average is 99948748093

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static System::Decimal Average(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, System::Decimal> ^ selector);

public static decimal Average<TSource> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,decimal> selector);

static member Average : seq<'Source> * Func<'Source, decimal> -> decimal

<Extension()>
Public Function Average(Of TSource) (source As IEnumerable(Of TSource), selector As Func(Of TSource, Decimal)) As Decimal

型パラメーター

パラメーター

戻り値

Decimal

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

例外

例

次のコード例は、を使用して平均を計算する方法を示して Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) います。The following code example demonstrates how to use Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>) to calculate an average.

string[] numbers = { "10007", "37", "299846234235" };

double average = numbers.Average(num => Convert.ToInt64(num));

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

// This code produces the following output:
//
// The average is 99948748093.

' Create an array of strings.
Dim numbers() As String = {"10007", "37", "299846234235"}

' Determine the average number after converting each
' string to an Int64 value.
Dim avg As Double =
numbers.Average(Function(number) Convert.ToInt64(number))

' Display the output.
Console.WriteLine($"The average is {avg}")

' This code produces the following output:
'
' The average is 99948748093

注釈

Visual Basic のクエリ式の構文では、 Aggregate Into Average() 句はの呼び出しに変換 Average します。In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.

こちらもご覧ください

• Aggregate 句 (Visual Basic)Aggregate Clause (Visual Basic)