Queryable.SequenceEqual 方法

定義

命名空間:

System.Linq

組件:

System.Linq.Queryable.dll

判斷兩個序列是否相等。

多載

SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>)	判斷兩個序列是否相等，方法是使用預設相等比較子來比較元素。
SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)	判斷兩個序列是否相等，方法是使用指定的 IEqualityComparer<T> 來比較元素。

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

來源:

Queryable.cs

判斷兩個序列是否相等，方法是使用預設相等比較子來比較元素。

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

類型參數

TSource

輸入序列專案的型別。

參數

source1

IQueryable<TSource>

要與 source2項目比較的 IQueryable<T>。

source2

IEnumerable<TSource>

要與第一個序列之項目比較的 IEnumerable<T>。

傳回

Boolean

如果兩個來源序列的長度相等，且其對應的元素比較相等，則 true;否則，false。

例外狀況

ArgumentNullException

source1 或 source2null。

範例

下列程式代碼範例示範如何使用 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 來判斷兩個序列是否相等。 在此範例中，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.

下列程式代碼範例會比較兩個不相等的序列。

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.

備註

SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 方法會產生 MethodCallExpression，代表呼叫 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 本身做為建構的泛型方法。 然後，它會將 MethodCallExpression 傳遞至 source1 參數 Provider 屬性所表示之 IQueryProvider 的 Execute<TResult>(Expression) 方法。

執行表示呼叫 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 表達式樹狀結構的查詢行為，取決於 source1 參數類型的實作。 預期的行為是，它會判斷這兩個來源序列是否相等。

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

來源:

Queryable.cs

判斷兩個序列是否相等，方法是使用指定的 IEqualityComparer<T> 來比較元素。

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

類型參數

TSource

輸入序列專案的型別。

參數

source1

IQueryable<TSource>

要與 source2項目比較的 IQueryable<T>。

source2

IEnumerable<TSource>

要與第一個序列之項目比較的 IEnumerable<T>。

comparer

IEqualityComparer<TSource>

用來比較元素的 IEqualityComparer<T>。

傳回

Boolean

如果兩個來源序列的長度相等，且其對應的元素比較相等，則 true;否則，false。

例外狀況

ArgumentNullException

source1 或 source2null。

備註

SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 方法會產生 MethodCallExpression，代表呼叫 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 本身做為建構的泛型方法。 然後，它會將 MethodCallExpression 傳遞至 source1 參數 Provider 屬性所表示之 IQueryProvider 的 Execute<TResult>(Expression) 方法。

執行表示呼叫 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 表達式樹狀結構的查詢行為，取決於 source1 參數類型的實作。 預期的行為是，它會使用 comparer 來比較元素，判斷這兩個來源序列是否相等。