PropertyCollection.IDictionary.Keys 属性
定义
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 ICollection 对象，它包含 IDictionary 对象的键。
property System::Collections::ICollection ^ System::Collections::IDictionary::Keys { System::Collections::ICollection ^ get(); };System.Collections.ICollection System.Collections.IDictionary.Keys { get; }member this.System.Collections.IDictionary.Keys : System.Collections.ICollection ReadOnly Property Keys As ICollection Implements IDictionary.Keys属性值
ICollection 对象，它包含 IDictionary 对象的键。
实现
示例
以下示例演示如何实现 Keys 属性。 此代码示例是为 IDictionary 类提供的一个更大示例的一部分。
public:
virtual property ICollection^ Keys
{
ICollection^ get()
{
// Return an array where each item is a key.
array<Object^>^ keys = gcnew array<Object^>(itemsInUse);
for (int i = 0; i < itemsInUse; i++)
{
keys[i] = items[i]->Key;
}
return keys;
}
}
public ICollection Keys
{
get
{
// Return an array where each item is a key.
Object[] keys = new Object[ItemsInUse];
for (Int32 n = 0; n < ItemsInUse; n++)
keys[n] = items[n].Key;
return keys;
}
}
Public ReadOnly Property Keys() As ICollection Implements IDictionary.Keys
Get
' Return an array where each item is a key.
' Note: Declaring keyArray() to have a size of ItemsInUse - 1
' ensures that the array is properly sized, in VB.NET
' declaring an array of size N creates an array with
' 0 through N elements, including N, as opposed to N - 1
' which is the default behavior in C# and C++.
Dim keyArray() As Object = New Object(ItemsInUse - 1) {}
Dim n As Integer
For n = 0 To ItemsInUse - 1
keyArray(n) = items(n).Key
Next n
Return keyArray
End Get
End Property
注解
返回ICollection的对象中键的顺序未指定，但保证与 属性返回Values的 中的ICollection相应值的顺序相同。
