IDictionary<TKey,TValue>.Keys 属性
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
获取包含 ICollection<T> 的键的 IDictionary<TKey,TValue>。
public:
property System::Collections::Generic::ICollection<TKey> ^ Keys { System::Collections::Generic::ICollection<TKey> ^ get(); };C#
public System.Collections.Generic.ICollection<TKey> Keys { get; }member this.Keys : System.Collections.Generic.ICollection<'Key>Public ReadOnly Property Keys As ICollection(Of TKey)
ICollection<TKey>
一个 ICollection<T>，它包含实现 IDictionary<TKey,TValue> 的对象的键。
下面的代码示例演示如何使用 Keys 属性单独枚举键。
此代码是可以编译和执行的更大示例的一部分。 请参阅 System.Collections.Generic.IDictionary<TKey,TValue>。
// To get the keys alone, use the Keys property.
icoll = openWith->Keys;
// The elements of the ValueCollection are strongly typed
// with the type that was specified for dictionary values.
Console::WriteLine();
for each( String^ s in icoll )
{
Console::WriteLine("Key = {0}", s);
}
C#
// To get the keys alone, use the Keys property.
icoll = openWith.Keys;
// The elements of the ValueCollection are strongly typed
// with the type that was specified for dictionary values.
Console.WriteLine();
foreach( string s in icoll )
{
Console.WriteLine("Key = {0}", s);
}
' To get the keys alone, use the Keys property.
icoll = openWith.Keys
' The elements of the ValueCollection are strongly typed
' with the type that was specified for dictionary values.
Console.WriteLine()
For Each s As String In icoll
Console.WriteLine("Key = {0}", s)
Next s
返回ICollection<T>的 中键的顺序未指定，但保证与 属性返回Values的 中的ICollection<T>相应值的顺序相同。
| 产品 | 版本 |
|---|---|
| .NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
| .NET Framework | 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
| UWP | 10.0 |
