Dictionary<TKey,TValue>.Remove Dictionary<TKey,TValue>.Remove Dictionary<TKey,TValue>.Remove Dictionary<TKey,TValue>.Remove Method

定义

命名空间:
System.Collections.Generic System.Collections.Generic System.Collections.Generic System.Collections.Generic
Assemblies:
System.Collections.dll, mscorlib.dll, netstandard.dll

重载

Remove(TKey) Remove(TKey) Remove(TKey) Remove(TKey)

从 Dictionary<TKey,TValue> 中移除所指定的键的值。Removes the value with the specified key from the Dictionary<TKey,TValue>.
Remove(TKey, TValue) Remove(TKey, TValue) Remove(TKey, TValue) Remove(TKey, TValue)

Remove(TKey) Remove(TKey) Remove(TKey) Remove(TKey)

从 Dictionary<TKey,TValue> 中移除所指定的键的值。Removes the value with the specified key from the Dictionary<TKey,TValue>.

public:
 virtual bool Remove(TKey key);
public bool Remove (TKey key);
abstract member Remove : 'Key -> bool
override this.Remove : 'Key -> bool
Public Function Remove (key As TKey) As Boolean

参数

key
TKey TKey TKey TKey

要移除的元素的键。The key of the element to remove.

返回

Boolean Boolean Boolean Boolean

如果成功找到并移除该元素，则为 true；否则为 false。true if the element is successfully found and removed; otherwise, false. 如果在 Dictionary<TKey,TValue> 中没有找到 key，则此方法返回 false。This method returns false if key is not found in the Dictionary<TKey,TValue>.

实现

Remove(TKey)

异常

ArgumentNullException ArgumentNullException ArgumentNullException ArgumentNullException

key 为 null。key is null.

示例

下面的代码示例演示如何使用Remove方法从字典中移除键/值对。The following code example shows how to remove a key/value pair from a dictionary using the Remove method.

此代码示例是为Dictionary<TKey,TValue>类提供的更大示例的一部分（openWith是此示例中使用的字典的名称）。This code example is part of a larger example provided for the Dictionary<TKey,TValue> class (openWith is the name of the Dictionary used in this example).

// Use the Remove method to remove a key/value pair.
Console::WriteLine("\nRemove(\"doc\")");
openWith->Remove("doc");

if (!openWith->ContainsKey("doc"))
{
    Console::WriteLine("Key \"doc\" is not found.");
}

// Use the Remove method to remove a key/value pair.
Console.WriteLine("\nRemove(\"doc\")");
openWith.Remove("doc");

if (!openWith.ContainsKey("doc"))
{
    Console.WriteLine("Key \"doc\" is not found.");
}

' Use the Remove method to remove a key/value pair.
Console.WriteLine(vbLf + "Remove(""doc"")")
openWith.Remove("doc")

If Not openWith.ContainsKey("doc") Then
    Console.WriteLine("Key ""doc"" is not found.")
End If

注解

如果不包含具有指定键的元素，则将Dictionary<TKey,TValue>保持不变。 Dictionary<TKey,TValue>If the Dictionary<TKey,TValue> does not contain an element with the specified key, the Dictionary<TKey,TValue> remains unchanged. 不引发异常。No exception is thrown.

此方法使用 O （1）操作。This method approaches an O(1) operation.

另请参阅
Add(TKey, TValue)Add(TKey, TValue)Add(TKey, TValue)Add(TKey, TValue)
Remove(TKey)

Remove(TKey, TValue) Remove(TKey, TValue) Remove(TKey, TValue) Remove(TKey, TValue) 

public:
 bool Remove(TKey key, [Runtime::InteropServices::Out] TValue % value);
public bool Remove (TKey key, out TValue value);
member this.Remove : 'Key * 'Value -> bool
Public Function Remove (key As TKey, ByRef value As TValue) As Boolean

参数

key
TKey TKey TKey TKey
value
TValue TValue TValue TValue

返回

Boolean Boolean Boolean Boolean

适用于