Queryable.SequenceEqual 方法

定义

确定两个序列是否相等。

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。

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。

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

Source:
Queryable.cs
Source:
Queryable.cs
Source:
Queryable.cs

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。

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。

参数

source1
IQueryable<TSource>

一个 IQueryable<T>,其元素用于与 source2 中的元素进行比较。

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。

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 false

例外

source1source2null

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。 在此示例中,序列相等。

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。

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

方法 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 生成一个 , MethodCallExpression 它将调用 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 自身表示为构造的泛型方法。 然后,MethodCallExpressionExecute<TResult>(Expression)它将 传递给 由 Provider 参数的 属性表示的 的 source1 方法IQueryProvider

由于执行表示调用 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 的表达式树而发生的查询行为取决于参数类型的 source1 实现。 预期行为是确定两个源序列是否相等。

适用于

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

Source:
Queryable.cs
Source:
Queryable.cs
Source:
Queryable.cs

通过使用指定的 IEqualityComparer<T> 比较元素以确定两个序列是否相等。

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);
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。

参数

source1
IQueryable<TSource>

一个 IQueryable<T>,其元素用于与 source2 中的元素进行比较。

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。

comparer
IEqualityComparer<TSource>

用于比较元素的 IEqualityComparer<T>

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 false

例外

source1source2null

注解

方法 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 生成一个 , MethodCallExpression 它将调用 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 自身表示为构造的泛型方法。 然后,MethodCallExpressionExecute<TResult>(Expression)它将 传递给 由 Provider 参数的 属性表示的 的 source1 方法IQueryProvider

由于执行表示调用 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 的表达式树而发生的查询行为取决于参数类型的 source1 实现。 预期行为是,它通过使用 comparer 比较元素来确定两个源序列是否相等。

适用于