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
如果在 ConcurrentDictionary<TKey,TValue> 中找到该键,则为 true;否则为 false。true if the key was found in the ConcurrentDictionary<TKey,TValue>; otherwise, false.
实现
例外
key 为 null。key is null.