ConcurrentDictionary<TKey,TValue>.TryGetValue(TKey, TValue) 方法

定义

尝试从 ConcurrentDictionary<TKey,TValue> 获取与指定的键关联的值。Attempts to get the value associated with the specified key from the ConcurrentDictionary<TKey,TValue>.

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

参数

key
TKey

要获取的值的键。The key of the value to get.

value
TValue

当此方法返回时,将包含 ConcurrentDictionary<TKey,TValue> 中具有指定键的对象;如果操作失败,则包含类型的默认值。When this method returns, contains the object from the ConcurrentDictionary<TKey,TValue> that has the specified key, or the default value of the type if the operation failed.

返回

Boolean

如果在 ConcurrentDictionary<TKey,TValue> 中找到该键,则为 true;否则为 falsetrue if the key was found in the ConcurrentDictionary<TKey,TValue>; otherwise, false.

实现

例外

keynullkey is null.

适用于