IDictionary.Remove(Object) メソッド

定義

指定したキーを持つ要素を IDictionary オブジェクトから削除します。Removes the element with the specified key from the IDictionary object.

public:
 void Remove(System::Object ^ key);
public void Remove (object key);
abstract member Remove : obj -> unit
Public Sub Remove (key As Object)

パラメーター

key
Object

削除する要素のキー。The key of the element to remove.

例外

keynull です。key is null.

IDictionary が読み取り専用です。The IDictionary object is read-only.

または-or- IDictionary は固定サイズです。The IDictionary has a fixed size.

Remove メソッドを実装する方法を次のコード例に示します。The following code example demonstrates how to implement the Remove method. このコード例は、IDictionary クラス用に用意されている大規模な例の一部です。This code example is part of a larger example provided for the IDictionary class.

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

注釈

指定したキーを持つ要素が IDictionary オブジェクトに格納されていない場合、IDictionary は変更されません。If the IDictionary object does not contain an element with the specified key, the IDictionary remains unchanged. 例外をスローすることはありません。No exception is thrown.

適用対象