IDictionary.Remove(Object) 方法

定義

命名空間:

System.Collections

組件:

System.Runtime.dll

從 IDictionary 物件中移除具有指定索引鍵的項目。

public:
 void Remove(System::Object ^ key);

public void Remove (object key);

abstract member Remove : obj -> unit

Public Sub Remove (key As Object)

參數

key

Object

要移除的項目索引鍵。

例外狀況

ArgumentNullException

key 為 null。

NotSupportedException

IDictionary 物件為唯讀。

-或-

IDictionary 具有固定的大小。

範例

下列程式代碼範例示範如何實作 Remove 方法。 此程式代碼範例是針對 類別提供的較大範例的 IDictionary 一部分。

public:
    virtual void Remove(Object^ key)
    {
        if (key == nullptr)
        {
            throw gcnew ArgumentNullException("key");
        }
        // Try to find the key in the DictionaryEntry array
        int index;
        if (TryGetIndexOfKey(key, &index))
        {
            // If the key is found, slide all the items down.
            Array::Copy(items, index + 1, items, index, itemsInUse -
                index - 1);
            itemsInUse--;
        }
        else
        {
            // If the key is not in the dictionary, just return.
            return;
        }
    }

public void Remove(object key)
{
    if (key == null) throw new ArgumentNullException("key");
    // Try to find the key in the DictionaryEntry array
    Int32 index;
    if (TryGetIndexOfKey(key, out index))
    {
        // If the key is found, slide all the items up.
        Array.Copy(items, index + 1, items, index, ItemsInUse - index - 1);
        ItemsInUse--;
    }
    else
    {
        // If the key is not in the dictionary, just return.
    }
}

Public Sub Remove(ByVal key As Object) Implements IDictionary.Remove
    If key = Nothing Then
        Throw New ArgumentNullException("key")
    End If
    ' Try to find the key in the DictionaryEntry array
    Dim index As Integer
    If TryGetIndexOfKey(key, index) Then

        ' If the key is found, slide all the items up.
        Array.Copy(items, index + 1, items, index, (ItemsInUse - index) - 1)
        ItemsInUse = ItemsInUse - 1
    Else

        ' If the key is not in the dictionary, just return. 
    End If
End Sub

備註

如果 IDictionary 物件不包含具有指定索引鍵的項目，則 IDictionary 會保持不變。 不會擲回任何例外狀況。