OrderedDictionary.RemoveAt(Int32) 方法

定义

命名空间:

System.Collections.Specialized

程序集:

System.Collections.Specialized.dll

Source:

OrderedDictionary.cs

从 OrderedDictionary 集合中移除指定索引处的项。

public:
 virtual void RemoveAt(int index);

public void RemoveAt (int index);

abstract member RemoveAt : int -> unit
override this.RemoveAt : int -> unit

Public Sub RemoveAt (index As Integer)

参数

index

Int32

要移除的项的从零开始的索引。

实现

RemoveAt(Int32)

例外

NotSupportedException

OrderedDictionary 集合为只读。

ArgumentOutOfRangeException

index 小于零。

或

index 等于或大于 Count。

示例

下面的代码示例演示了对集合的 OrderedDictionary 修改。 在此示例中， RemoveAt 方法与 Count 属性一起使用，以从 中删除最后一 OrderedDictionary个条目。 此代码是可在 中查看的较大代码示例的一 OrderedDictionary部分。

// Modifying the OrderedDictionary
if (!myOrderedDictionary->IsReadOnly)
{
    // Insert a new key to the beginning of the OrderedDictionary
    myOrderedDictionary->Insert(0, "insertedKey1", "insertedValue1");

    // Modify the value of the entry with the key "testKey2"
    myOrderedDictionary["testKey2"] = "modifiedValue";

    // Remove the last entry from the OrderedDictionary: "testKey3"
    myOrderedDictionary->RemoveAt(myOrderedDictionary->Count - 1);

    // Remove the "keyToDelete" entry, if it exists
    if (myOrderedDictionary->Contains("keyToDelete"))
    {
        myOrderedDictionary->Remove("keyToDelete");
    }
}

// Modifying the OrderedDictionary
if (!myOrderedDictionary.IsReadOnly)
{
    // Insert a new key to the beginning of the OrderedDictionary
    myOrderedDictionary.Insert(0, "insertedKey1", "insertedValue1");

    // Modify the value of the entry with the key "testKey2"
    myOrderedDictionary["testKey2"] = "modifiedValue";

    // Remove the last entry from the OrderedDictionary: "testKey3"
    myOrderedDictionary.RemoveAt(myOrderedDictionary.Count - 1);

    // Remove the "keyToDelete" entry, if it exists
    if (myOrderedDictionary.Contains("keyToDelete"))
    {
        myOrderedDictionary.Remove("keyToDelete");
    }
}

' Modifying the OrderedDictionary
If Not myOrderedDictionary.IsReadOnly Then

    ' Insert a new key to the beginning of the OrderedDictionary
    myOrderedDictionary.Insert(0, "insertedKey1", "insertedValue1")

    ' Modify the value of the entry with the key "testKey2"
    myOrderedDictionary("testKey2") = "modifiedValue"

    ' Remove the last entry from the OrderedDictionary: "testKey3"
    myOrderedDictionary.RemoveAt(myOrderedDictionary.Count - 1)

    ' Remove the "keyToDelete" entry, if it exists
    If (myOrderedDictionary.Contains("keyToDelete")) Then
        myOrderedDictionary.Remove("keyToDelete")
    End If
End If

注解

删除条目后面的条目会向上移动以占据空位，并且也会更新移动的条目的索引。