通过

PropertyCollection.IDictionary.Contains(Object) 方法

  • 参考

定义

命名空间:
System.DirectoryServices
程序集:
System.DirectoryServices.dll
包:
System.DirectoryServices v6.0.0
包:
System.DirectoryServices v7.0.0
包:
System.DirectoryServices v8.0.0
包:
System.DirectoryServices v9.0.0-preview.2.24128.5
Source:
PropertyCollection.cs
Source:
PropertyCollection.cs
Source:
PropertyCollection.cs

确定 IDictionary 对象是否包含具有指定键的元素。

 virtual bool System.Collections.IDictionary.Contains(System::Object ^ value) = System::Collections::IDictionary::Contains;
bool IDictionary.Contains (object value);
abstract member System.Collections.IDictionary.Contains : obj -> bool
override this.System.Collections.IDictionary.Contains : obj -> bool
Function Contains (value As Object) As Boolean Implements IDictionary.Contains

参数

value
Object

要在 IDictionary 对象中查找的键。

返回

Boolean

如果 true 包含具有键的元素，则为 IDictionary；否则为 false。

实现

Contains(Object)

例外

ArgumentNullException

key 为 null。

示例

以下示例演示如何实现 Contains 方法。 此示例是为 类提供的更大示例的一 IDictionary 部分。

public:
    virtual bool Contains(Object^ key)
    {
        int index;
        return TryGetIndexOfKey(key, &index);
    }

public bool Contains(object key)
{
   Int32 index;
   return TryGetIndexOfKey(key, out index);
}

Public Function Contains(ByVal key As Object) As Boolean Implements IDictionary.Contains
    Dim index As Integer
    Return TryGetIndexOfKey(key, index)
End Function

适用于