Queryable.SequenceEqual 方法

定义

确定两个序列是否相等。Determines whether two sequences are equal.

重载

SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>)

通过使用默认的相等比较器比较元素以确定两个序列是否相等。Determines whether two sequences are equal by using the default equality comparer to compare elements.

SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)

通过使用指定的 IEqualityComparer<T> 比较元素以确定两个序列是否相等。Determines whether two sequences are equal by using a specified IEqualityComparer<T> to compare elements.

SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>)

通过使用默认的相等比较器比较元素以确定两个序列是否相等。Determines whether two sequences are equal by using the default equality comparer to compare elements.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static bool SequenceEqual(System::Linq::IQueryable<TSource> ^ source1, System::Collections::Generic::IEnumerable<TSource> ^ source2);
public static bool SequenceEqual<TSource> (this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2);
static member SequenceEqual : System.Linq.IQueryable<'Source> * seq<'Source> -> bool
<Extension()>
Public Function SequenceEqual(Of TSource) (source1 As IQueryable(Of TSource), source2 As IEnumerable(Of TSource)) As Boolean

类型参数

TSource

输入序列中的元素的类型。The type of the elements of the input sequences.

参数

source1
IQueryable<TSource>

一个 IQueryable<T>,其元素用于与 source2 中的元素进行比较。An IQueryable<T> whose elements to compare to those of source2.

source2
IEnumerable<TSource>

一个 IEnumerable<T>,其元素用于与第一个序列中的元素进行比较。An IEnumerable<T> whose elements to compare to those of the first sequence.

返回

如果两个源序列的长度相等并且它们的对应元素也相等,则为 true;否则为 falsetrue if the two source sequences are of equal length and their corresponding elements compare equal; otherwise, false.

异常

source1source2nullsource1 or source2 is null.

示例

下面的代码示例演示如何使用 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 来确定两个序列是否相等。The following code example demonstrates how to use SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) to determine whether two sequences are equal. 在此示例中,序列是相等的。In this example the sequences are equal.

class Pet
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public static void SequenceEqualEx1()
{
    Pet pet1 = new Pet { Name = "Turbo", Age = 2 };
    Pet pet2 = new Pet { Name = "Peanut", Age = 8 };

    // Create two lists of pets.
    List<Pet> pets1 = new List<Pet> { pet1, pet2 };
    List<Pet> pets2 = new List<Pet> { pet1, pet2 };

    // Determine if the lists are equal.
    bool equal = pets1.AsQueryable().SequenceEqual(pets2);

    Console.WriteLine(
        "The lists {0} equal.",
        equal ? "are" : "are not");
}

/*
    This code produces the following output:

    The lists are equal.
*/

Class Pet
    Public Name As String
    Public Age As Integer
End Class

Shared Sub SequenceEqualEx1()
    Dim pet1 As New Pet With {.Name = "Turbo", .Age = 2}
    Dim pet2 As New Pet With {.Name = "Peanut", .Age = 8}

    ' Create two lists of pets.
    Dim pets1 As New List(Of Pet)(New Pet() {pet1, pet2})
    Dim pets2 As New List(Of Pet)(New Pet() {pet1, pet2})

    ' Determine if the lists are equal.
    Dim equal As Boolean = pets1.AsQueryable().SequenceEqual(pets2)

    ' Display the output.
    Dim text As String = IIf(equal, "are", "are not")
    MsgBox("The lists " & text & " equal.")
End Sub

'This code produces the following output:

'The lists are equal.

下面的代码示例比较两个不相等的序列。The following code example compares two sequences that are not equal.

class Pet
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public static void SequenceEqualEx2()
{
    Pet pet1 = new Pet() { Name = "Turbo", Age = 2 };
    Pet pet2 = new Pet() { Name = "Peanut", Age = 8 };

    // Create two lists of pets.
    List<Pet> pets1 = new List<Pet> { pet1, pet2 };
    List<Pet> pets2 = new List<Pet> { 
        new Pet { Name = "Turbo", Age = 2 },
        new Pet { Name = "Peanut", Age = 8 } 
    };

    // Determine if the lists are equal.
    bool equal = pets1.AsQueryable().SequenceEqual(pets2);

    Console.WriteLine("The lists {0} equal.", equal ? "are" : "are NOT");
}

/*
    This code produces the following output:

    The lists are NOT equal.
*/

Class Pet
    Public Name As String
    Public Age As Integer
End Class

Shared Sub SequenceEqualEx2()
    Dim pet1 As New Pet With {.Name = "Turbo", .Age = 2}
    Dim pet2 As New Pet With {.Name = "Peanut", .Age = 8}

    ' Create two lists of pets.
    Dim pets1 As New List(Of Pet)()
    pets1.Add(pet1)
    pets1.Add(pet2)

    Dim pets2 As New List(Of Pet)()
    pets2.Add(New Pet With {.Name = "Turbo", .Age = 2})
    pets2.Add(New Pet With {.Name = "Peanut", .Age = 8})

    ' Determine if the lists are equal.
    Dim equal As Boolean = pets1.AsQueryable().SequenceEqual(pets2)

    ' Display the output.
    Dim text As String = IIf(equal, "are", "are not")
    MsgBox("The lists " & text & " equal.")
End Sub

' This code produces the following output:

' The lists are not equal.

注解

SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 方法生成一个 MethodCallExpression,它表示作为构造的泛型方法调用 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 本身。The SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) method generates a MethodCallExpression that represents calling SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) itself as a constructed generic method. 然后,它将 MethodCallExpression 传递到 IQueryProviderExecute<TResult>(Expression) 方法(由 source1 参数的 Provider 属性表示)。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source1 parameter.

因执行表示调用 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 的表达式树而发生的查询行为取决于 source1 参数类型的实现。The query behavior that occurs as a result of executing an expression tree that represents calling SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) depends on the implementation of the type of the source1 parameter. 预期的行为是确定两个源序列是否相等。The expected behavior is that it determines if the two source sequences are equal.

SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)

通过使用指定的 IEqualityComparer<T> 比较元素以确定两个序列是否相等。Determines whether two sequences are equal by using a specified IEqualityComparer<T> to compare elements.

public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
 static bool SequenceEqual(System::Linq::IQueryable<TSource> ^ source1, System::Collections::Generic::IEnumerable<TSource> ^ source2, System::Collections::Generic::IEqualityComparer<TSource> ^ comparer);
public static bool SequenceEqual<TSource> (this System.Linq.IQueryable<TSource> source1, System.Collections.Generic.IEnumerable<TSource> source2, System.Collections.Generic.IEqualityComparer<TSource> comparer);
static member SequenceEqual : System.Linq.IQueryable<'Source> * seq<'Source> * System.Collections.Generic.IEqualityComparer<'Source> -> bool
<Extension()>
Public Function SequenceEqual(Of TSource) (source1 As IQueryable(Of TSource), source2 As IEnumerable(Of TSource), comparer As IEqualityComparer(Of TSource)) As Boolean

类型参数

TSource

输入序列中的元素的类型。The type of the elements of the input sequences.

参数

source1
IQueryable<TSource>

一个 IQueryable<T>,其元素用于与 source2 中的元素进行比较。An IQueryable<T> whose elements to compare to those of source2.

source2
IEnumerable<TSource>

一个 IEnumerable<T>,其元素用于与第一个序列中的元素进行比较。An IEnumerable<T> whose elements to compare to those of the first sequence.

comparer
IEqualityComparer<TSource>

用于比较元素的 IEqualityComparer<T>An IEqualityComparer<T> to use to compare elements.

返回

如果两个源序列的长度相等并且它们的对应元素也相等,则为 true;否则为 falsetrue if the two source sequences are of equal length and their corresponding elements compare equal; otherwise, false.

异常

source1source2nullsource1 or source2 is null.

注解

SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 方法生成一个 MethodCallExpression,它表示作为构造的泛型方法调用 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 本身。The SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) method generates a MethodCallExpression that represents calling SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) itself as a constructed generic method. 然后,它将 MethodCallExpression 传递到 IQueryProviderExecute<TResult>(Expression) 方法(由 source1 参数的 Provider 属性表示)。It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source1 parameter.

因执行表示调用 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 的表达式树而发生的查询行为取决于 source1 参数类型的实现。The query behavior that occurs as a result of executing an expression tree that represents calling SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) depends on the implementation of the type of the source1 parameter. 预期的行为是通过使用 comparer 对元素进行比较来确定两个源序列是否相等。The expected behavior is that it determines if the two source sequences are equal by using comparer to compare elements.

适用于