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

定义

命名空间:
System.Collections.ObjectModel
程序集:
System.ObjectModel.dll
程序集:
mscorlib.dll, System.ObjectModel.dll
程序集:
mscorlib.dll
程序集:
netstandard.dll

检索与指定键关联的值。Retrieves the value that is associated with the specified key.

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

将检索其值的键。The key whose value will be retrieved.

value
TValue

当此方法返回时，如果找到指定键，则返回与该键相关联的值；否则，将返回 value 参数的类型的默认值。When this method returns, the value associated with the specified key, if the key is found; otherwise, the default value for the type of the value parameter. 此参数未经初始化即被传递。This parameter is passed uninitialized.

返回

Boolean

如果实现 ReadOnlyDictionary<TKey,TValue> 的对象包含具有指定键的元素，则为 true；否则，为 false。true if the object that implements ReadOnlyDictionary<TKey,TValue> contains an element with the specified key; otherwise, false.

实现

TryGetValue(TKey, TValue) TryGetValue(TKey, TValue)

适用于