Queryable.SequenceEqual 方法
定義
重要
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判斷兩個序列是否相等。
多載
SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) |
使用預設相等比較子來比較項目,以判斷兩個序列是否相等。 |
SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) |
使用指定的 IEqualityComparer<T> 來比較項目,以判斷兩個序列是否相等。 |
SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>)
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
使用預設相等比較子來比較項目,以判斷兩個序列是否相等。
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
類型參數
- TSource
輸入序列之項目的類型。
參數
- source1
- IQueryable<TSource>
IQueryable<T>,其項目要與 source2
的項目比較。
- source2
- IEnumerable<TSource>
IEnumerable<T>,其項目要與第一個序列的項目比較。
傳回
如果兩個來源序列的長度相同,而且其對應項目比較結果相同,則為 true
,否則為 false
。
例外狀況
source1
或 source2
為 null
。
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
方法 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 會產生 , MethodCallExpression 表示呼叫 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 本身為建構的泛型方法。 然後,它會將 傳遞給 MethodCallExpressionExecute<TResult>(Expression) 參數之 屬性所Provider表示的方法IQueryProvidersource1
。
執行表示呼叫 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>) 的表達式樹狀結構所產生的查詢行為,取決於參數類型的實作 source1
。 預期的行為是它會判斷兩個來源序列是否相等。
適用於
SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
- 來源:
- Queryable.cs
使用指定的 IEqualityComparer<T> 來比較項目,以判斷兩個序列是否相等。
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
類型參數
- TSource
輸入序列之項目的類型。
參數
- source1
- IQueryable<TSource>
IQueryable<T>,其項目要與 source2
的項目比較。
- source2
- IEnumerable<TSource>
IEnumerable<T>,其項目要與第一個序列的項目比較。
- comparer
- IEqualityComparer<TSource>
用來比較項目的 IEqualityComparer<T>。
傳回
如果兩個來源序列的長度相同,而且其對應項目比較結果相同,則為 true
,否則為 false
。
例外狀況
source1
或 source2
為 null
。
備註
方法 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 會產生 , MethodCallExpression 表示呼叫 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 本身為建構的泛型方法。 然後,它會將 傳遞給 MethodCallExpressionExecute<TResult>(Expression) 參數之 屬性所Provider表示的方法IQueryProvidersource1
。
執行表示呼叫 SequenceEqual<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) 的表達式樹狀結構所產生的查詢行為,取決於參數類型的實作 source1
。 預期的行為是它會判斷兩個來源序列是否相等,方法是使用 comparer
來比較專案。