EventDescriptorCollection.Item[] 属性

Source:

EventDescriptorCollection.cs

Source:

EventDescriptorCollection.cs

Source:

EventDescriptorCollection.cs

Source:

EventDescriptorCollection.cs

Source:

EventDescriptorCollection.cs

public:
 virtual property System::ComponentModel::EventDescriptor ^ default[int] { System::ComponentModel::EventDescriptor ^ get(int index); };

public virtual System.ComponentModel.EventDescriptor? this[int index] { get; }

public virtual System.ComponentModel.EventDescriptor this[int index] { get; }

member this.Item(int) : System.ComponentModel.EventDescriptor

Default Public Overridable ReadOnly Property Item(index As Integer) As EventDescriptor

参数

属性值

EventDescriptor具有指定索引号的索引号。

例外

示例

下面的代码示例使用 Item[] 该属性打印文本框中索引号指定的名称 EventDescriptor 。 由于索引号是从零开始的，本示例打印第二 EventDescriptor个索引号的名称。 它要求 button1 并在 textBox1 窗体上实例化。

private:
   void PrintIndexItem()
   {
      
      // Creates a new collection and assigns it the events for button1.
      EventDescriptorCollection^ events = TypeDescriptor::GetEvents( button1 );
      
      // Prints the second event's name.
      textBox1->Text = events[ 1 ]->ToString();
   }

private void PrintIndexItem() {
    // Creates a new collection and assigns it the events for button1.
    EventDescriptorCollection events = TypeDescriptor.GetEvents(button1);
 
    // Prints the second event's name.
    textBox1.Text = events[1].ToString();
 }

Private Sub PrintIndexItem()
    ' Creates a new collection and assigns it the events for button1.
    Dim events As EventDescriptorCollection = TypeDescriptor.GetEvents(button1)
    
    ' Prints the second event's name.
    textBox1.Text = events(1).ToString()
End Sub

注解

索引号从零开始。 因此，必须从特定 EventDescriptor 位置减去 1 才能访问该 EventDescriptor数字。 例如，若要获取第三 EventDescriptor个，需要指定 myColl[2]。

另请参阅

• EventDescriptor
• TypeDescriptor

Source:

EventDescriptorCollection.cs

Source:

EventDescriptorCollection.cs

Source:

EventDescriptorCollection.cs

Source:

EventDescriptorCollection.cs

Source:

EventDescriptorCollection.cs

public:
 virtual property System::ComponentModel::EventDescriptor ^ default[System::String ^] { System::ComponentModel::EventDescriptor ^ get(System::String ^ name); };

public virtual System.ComponentModel.EventDescriptor this[string name] { get; }

member this.Item(string) : System.ComponentModel.EventDescriptor

Default Public Overridable ReadOnly Property Item(name As String) As EventDescriptor

参数

属性值

EventDescriptor具有指定名称或null事件不存在。

示例

下面的代码示例使用 Item[] 属性打印索引所指定的组件的 EventDescriptor 类型。 它要求 button1 并在 textBox1 窗体上实例化。

private:
   void PrintIndexItem2()
   {
      
      // Creates a new collection and assigns it the events for button1.
      EventDescriptorCollection^ events = TypeDescriptor::GetEvents( button1 );
      
      // Sets an EventDescriptor to the specific event.
      EventDescriptor^ myEvent = events[ "KeyDown" ];
      
      // Prints the name of the event.
      textBox1->Text = myEvent->Name;
   }

private void PrintIndexItem2() {
    // Creates a new collection and assigns it the events for button1.
    EventDescriptorCollection events = TypeDescriptor.GetEvents(button1);
 
    // Sets an EventDescriptor to the specific event.
    EventDescriptor myEvent = events["KeyDown"];
 
    // Prints the name of the event.
    textBox1.Text = myEvent.Name;
 }

Private Sub PrintIndexItem2()
    ' Creates a new collection and assigns it the events for button1.
    Dim events As EventDescriptorCollection = TypeDescriptor.GetEvents(button1)
    
    ' Sets an EventDescriptor to the specific event.
    Dim myEvent As EventDescriptor = events("KeyDown")
    
    ' Prints the name of the event.
    textBox1.Text = myEvent.Name
End Sub

注解

搜索名称时，该 Item[] 属性区分大小写。 也就是说，名称“Ename”和“ename”被视为两个不同的事件。

另请参阅

• EventDescriptor
• TypeDescriptor