ImmutableDictionary.GetValueOrDefault 方法
定义
重载
| GetValueOrDefault<TKey,TValue>(IImmutableDictionary<TKey,TValue>, TKey, TValue) |
如果字典中存在匹配的键,则获取给定键的值。Gets the value for a given key if a matching key exists in the dictionary. |
| GetValueOrDefault<TKey,TValue>(IImmutableDictionary<TKey,TValue>, TKey) |
如果字典中存在匹配的键,则获取给定键的值。Gets the value for a given key if a matching key exists in the dictionary. |
GetValueOrDefault<TKey,TValue>(IImmutableDictionary<TKey,TValue>, TKey, TValue)
如果字典中存在匹配的键,则获取给定键的值。Gets the value for a given key if a matching key exists in the dictionary.
public:
generic <typename TKey, typename TValue>
[System::Runtime::CompilerServices::Extension]
static TValue GetValueOrDefault(System::Collections::Immutable::IImmutableDictionary<TKey, TValue> ^ dictionary, TKey key, TValue defaultValue);
public static TValue GetValueOrDefault<TKey,TValue> (this System.Collections.Immutable.IImmutableDictionary<TKey,TValue> dictionary, TKey key, TValue defaultValue);
static member GetValueOrDefault : System.Collections.Immutable.IImmutableDictionary<'Key, 'Value> * 'Key * 'Value -> 'Value
<Extension()>
Public Function GetValueOrDefault(Of TKey, TValue) (dictionary As IImmutableDictionary(Of TKey, TValue), key As TKey, defaultValue As TValue) As TValue
类型参数
- TKey
键的类型。The type of the key.
- TValue
值的类型。The type of the value.
参数
- dictionary
- IImmutableDictionary<TKey,TValue>
要从中检索值的字典。The dictionary to retrieve the value from.
- key
- TKey
要搜索的键。The key to search for.
- defaultValue
- TValue
在字典中找不到匹配键时返回的默认值。The default value to return if no matching key is found in the dictionary.
返回
- TValue
该键的值;如果找不到匹配的键,则为 defaultValue。The value for the key, or defaultValue if no matching key was found.
适用于
GetValueOrDefault<TKey,TValue>(IImmutableDictionary<TKey,TValue>, TKey)
如果字典中存在匹配的键,则获取给定键的值。Gets the value for a given key if a matching key exists in the dictionary.
public:
generic <typename TKey, typename TValue>
[System::Runtime::CompilerServices::Extension]
static TValue GetValueOrDefault(System::Collections::Immutable::IImmutableDictionary<TKey, TValue> ^ dictionary, TKey key);
public static TValue GetValueOrDefault<TKey,TValue> (this System.Collections.Immutable.IImmutableDictionary<TKey,TValue> dictionary, TKey key);
public static TValue? GetValueOrDefault<TKey,TValue> (this System.Collections.Immutable.IImmutableDictionary<TKey,TValue> dictionary, TKey key);
static member GetValueOrDefault : System.Collections.Immutable.IImmutableDictionary<'Key, 'Value> * 'Key -> 'Value
<Extension()>
Public Function GetValueOrDefault(Of TKey, TValue) (dictionary As IImmutableDictionary(Of TKey, TValue), key As TKey) As TValue
类型参数
- TKey
键的类型。The type of the key.
- TValue
值的类型。The type of the value.
参数
- dictionary
- IImmutableDictionary<TKey,TValue>
要从中检索值的字典。The dictionary to retrieve the value from.
- key
- TKey
要搜索的键。The key to search for.
返回
- TValue
该键的值;如果找不到匹配的键,则为 default(TValue)。The value for the key, or default(TValue) if no matching key was found.