DataBindingHandlerAttribute 构造函数

参考

定义

命名空间:: System.Web.UI

程序集:: System.Web.dll

重要

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重载

DataBindingHandlerAttribute()	不使用任何参数初始化 DataBindingHandlerAttribute 类的新实例。这是无参数构造函数。
DataBindingHandlerAttribute(String)	使用指定的类型名称初始化 DataBindingHandlerAttribute 类的新实例。
DataBindingHandlerAttribute(Type)	初始化指定的 Type 的 DataBindingHandlerAttribute 类的新实例。

DataBindingHandlerAttribute()

不使用任何参数初始化 DataBindingHandlerAttribute 类的新实例。这是无参数构造函数。

public:
 DataBindingHandlerAttribute();

public DataBindingHandlerAttribute ();

Public Sub New ()

示例

下面的代码示例使用 DataBindingHandlerAttribute 构造函数。

// The following example uses the Default
// DataBindingHandlerAttribute constructor.
using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Security.Permissions;

namespace MyTextCustomControl
{
   [ DataBindingHandlerAttribute() ]
   [AspNetHostingPermission(SecurityAction.Demand, 
      Level=AspNetHostingPermissionLevel.Minimal)]
   public sealed class MyTextBox : TextBox
   {
      protected override void Render(HtmlTextWriter output)
      {
         output.Write("This class uses the DataBindingHandlerAttribute class.");
      }
   }
}

' The following example uses the Default
' DataBindingHandlerAttribute constructor.
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Security.Permissions

Namespace MyTextCustomControl

 <DataBindingHandlerAttribute()>  _
 <AspNetHostingPermission(SecurityAction.Demand, _
   Level:=AspNetHostingPermissionLevel.Minimal)> _
 Public NotInheritable Class MyTextBox
   Inherits TextBox
   
   Protected Overrides Sub Render(output As HtmlTextWriter)
      output.Write("This class uses the DataBindingHandlerAttribute class.")
   End Sub

 End Class
End Namespace 'MyTextCustomControl

适用于

DataBindingHandlerAttribute(String)

使用指定的类型名称初始化 DataBindingHandlerAttribute 类的新实例。

public:
 DataBindingHandlerAttribute(System::String ^ typeName);

public DataBindingHandlerAttribute (string typeName);

new System.Web.UI.DataBindingHandlerAttribute : string -> System.Web.UI.DataBindingHandlerAttribute

Public Sub New (typeName As String)

参数

typeName: String

数据绑定处理程序 Type 的完全限定名称。

示例

下面的代码示例使用 DataBindingHandlerAttribute 构造函数为 Web 控件指定自定义 DataBindingHandler 类。

// The following example uses the 
// DataBindingHandlerAttribute(String) constructor to designate
// the custom DataBindingHandler class, named MyDataBindingHandler,
// for the custom MyWebControl class.
using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.Design;
using System.ComponentModel.Design;
using System.Security.Permissions;

namespace MyTextCustomControl
{
   [ DataBindingHandlerAttribute("MyTextCustomControl.MyDataBindingHandler") ]
   [AspNetHostingPermission(SecurityAction.Demand, 
      Level=AspNetHostingPermissionLevel.Minimal)]
   public sealed class MyWebControl : WebControl
   {
      protected override void Render(HtmlTextWriter output)
      {
         output.Write("This class uses the DataBindingHandlerAttribute class.");
      }
   }

   public class MyDataBindingHandler : TextDataBindingHandler
   {
      public override void DataBindControl(IDesignerHost host, Control myControl)
      {
         ((TextBox)myControl).Text = "Added by MyDataBindingHandler";
      }
   }
}

' The following example uses the 
' DataBindingHandlerAttribute(String) constructor to designate
' the custom DataBindingHandler class, named MyDataBindingHandler,
' for the custom MyWebControl class.
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.Design
Imports System.ComponentModel.Design
Imports System.Security.Permissions

Namespace MyTextCustomControl

 <DataBindingHandlerAttribute("MyTextCustomControl.MyDataBindingHandler")>  _
 <AspNetHostingPermission(SecurityAction.Demand, _
   Level:=AspNetHostingPermissionLevel.Minimal)> _
 Public NotInheritable Class MyWebControl
   Inherits WebControl
   
   Protected Overrides Sub Render(output As HtmlTextWriter)
      output.Write("This class uses the DataBindingHandlerAttribute class.")
   End Sub
 End Class


 Public Class MyDataBindingHandler
   Inherits TextDataBindingHandler
   
   Public Overrides Sub DataBindControl(host As IDesignerHost, myControl As Control)
      CType(myControl, TextBox).Text = "Added by MyDataBindingHandler"
   End Sub
 End Class
End Namespace 'MyTextCustomControl

注解

此构造函数的类型名称是该类型的完全限定名称，包括其程序集名称。

适用于

DataBindingHandlerAttribute(Type)

初始化指定的 Type 的 DataBindingHandlerAttribute 类的新实例。

public:
 DataBindingHandlerAttribute(Type ^ type);

public DataBindingHandlerAttribute (Type type);

new System.Web.UI.DataBindingHandlerAttribute : Type -> System.Web.UI.DataBindingHandlerAttribute

Public Sub New (type As Type)

参数

type: Type

数据绑定处理程序的 Type。

示例

下面的代码示例定义设计器要在编辑模式下使用的数据绑定处理程序（命名 MyDataBindingHandler）。退出编辑模式时， Text 将显示属性值。


using System;
using System.Collections;
using System.Web.UI;
using System.Web.UI.Design;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.ComponentModel.Design;

namespace CustomControls
{
  [
    DataBindingHandler(typeof(MyDataBindingHandler)),
    ToolboxData("<{0}:MyLabel runat=server></{0}:MyLabel>")
  ]
  public class MyLabel : Label 
  {
    public  MyLabel()
    { 
      // Insert your code here.
    } 
  }

  public class MyDataBindingHandler : DataBindingHandler
  {
    public override void DataBindControl(IDesignerHost host, Control control)
    {
      ((Label)control).Text = "Added by data binding handler.";
    }
  }
}


Namespace CustomControls

  <DataBindingHandler(GetType(MyDataBindingHandler)), ToolboxData("<{0}:MyLabel runat=server></{0}:MyLabel>")>  _
    Public Class MyLabel
      Inherits Label
      
      Public Sub New()
        'Insert your code here.
      End Sub
      
    End Class
   
    Public Class MyDataBindingHandler
      Inherits DataBindingHandler
      
      Public Overrides Sub DataBindControl(host As IDesignerHost, control As Control)
         CType(control, Label).Text = "Added by data binding handler."
      End Sub
      
    End Class
    
End Namespace 'CustomControls

注解

此属性的语法为：

[DataBindingHandlerAttribute  
  (typeof(dataBindingHandlerType))]

适用于

DataBindingHandlerAttribute 构造函数

定义

重载

DataBindingHandlerAttribute()

示例

适用于

DataBindingHandlerAttribute(String)

参数

示例

注解

适用于

DataBindingHandlerAttribute(Type)

参数

示例

注解

适用于

其他资源