HashSet<T>.SymmetricExceptWith(IEnumerable<T>) 方法

定义

命名空间:

System.Collections.Generic

程序集:

System.Collections.dll

Source:

HashSet.cs

修改当前 HashSet<T> 对象以仅包含存在于该对象中或存在于指定集合中的元素（但并非两者）。

public:
 virtual void SymmetricExceptWith(System::Collections::Generic::IEnumerable<T> ^ other);

public void SymmetricExceptWith (System.Collections.Generic.IEnumerable<T> other);

abstract member SymmetricExceptWith : seq<'T> -> unit
override this.SymmetricExceptWith : seq<'T> -> unit

Public Sub SymmetricExceptWith (other As IEnumerable(Of T))

参数

other

IEnumerable<T>

要与当前的 HashSet<T> 对象进行比较的集合。

实现

SymmetricExceptWith(IEnumerable<T>)

例外

ArgumentNullException

other 为 null。

示例

以下示例使用重叠的数据集创建两 HashSet<T> 个集合。 然后，使用 SymmetricExceptWith 方法修改包含较低值的集，以仅包含两个集中不存在的值。

HashSet<int> lowNumbers = new HashSet<int>();
HashSet<int> highNumbers = new HashSet<int>();

for (int i = 0; i < 6; i++)
{
    lowNumbers.Add(i);
}

for (int i = 3; i < 10; i++)
{
    highNumbers.Add(i);
}

Console.Write("lowNumbers contains {0} elements: ", lowNumbers.Count);
DisplaySet(lowNumbers);

Console.Write("highNumbers contains {0} elements: ", highNumbers.Count);
DisplaySet(highNumbers);

Console.WriteLine("lowNumbers SymmetricExceptWith highNumbers...");
lowNumbers.SymmetricExceptWith(highNumbers);

Console.Write("lowNumbers contains {0} elements: ", lowNumbers.Count);
DisplaySet(lowNumbers);

void DisplaySet(HashSet<int> set)
{
    Console.Write("{");
    foreach (int i in set)
    {
        Console.Write(" {0}", i);
    }
    Console.WriteLine(" }");
}

/* This example provides output similar to the following:
* lowNumbers contains 6 elements: { 0 1 2 3 4 5 }
* highNumbers contains 7 elements: { 3 4 5 6 7 8 9 }
* lowNumbers SymmetricExceptWith highNumbers...
* lowNumbers contains 7 elements: { 0 1 2 8 7 6 9 }
*/

Shared Sub Main()

    Dim lowNumbers As HashSet(Of Integer) = New HashSet(Of Integer)()
    Dim highNumbers As HashSet(Of Integer) = New HashSet(Of Integer)()

    For i As Integer = 0 To 5
        lowNumbers.Add(i)
    Next i

    For i As Integer = 3 To 9
        highNumbers.Add(i)
    Next i

    Console.Write("lowNumbers contains {0} elements: ", lowNumbers.Count)
    DisplaySet(lowNumbers)

    Console.Write("highNumbers contains {0} elements: ", highNumbers.Count)
    DisplaySet(highNumbers)

    Console.WriteLine("lowNumbers SymmetricExceptWith highNumbers...")
    lowNumbers.SymmetricExceptWith(highNumbers)

    Console.Write("lowNumbers contains {0} elements: ", lowNumbers.Count)
    DisplaySet(lowNumbers)
End Sub
' This example produces output similar to the following:
' lowNumbers contains 6 elements: { 0 1 2 3 4 5 }
' highNumbers contains 7 elements: { 3 4 5 6 7 8 9 }
' lowNumbers SymmetricExceptWith highNumbers...
' lowNumbers contains 7 elements: { 0 1 2 8 7 6 9 }

注解

other如果参数是具有HashSet<T>与当前HashSet<T>对象相同的相等比较器的集合，则此方法是 O (n) 操作。 否则，此方法是 O (n + m) 操作，其中 n 是 中的other元素数，为 。mCount