ControlValuePropertyAttribute.DefaultValue 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。
获取控件默认属性的默认值。
public:
property System::Object ^ DefaultValue { System::Object ^ get(); };
public object DefaultValue { get; }
member this.DefaultValue : obj
Public ReadOnly Property DefaultValue As Object
属性值
控件默认属性的默认值。
示例
下面的代码示例演示如何通过将 属性应用于ControlValuePropertyAttribute自定义控件来设置 DefaultValue 属性。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Samples.AspNet.CS.Controls
{
// Set ControlValueProperty attribute to specify the default
// property of this control that a ControlParameter object
// binds to at run time.
[DefaultProperty("Text")]
[ControlValueProperty("Text", "Default Text")]
public class SimpleCustomControl : WebControl
{
private string text;
[Bindable(true)]
[Category("Appearance")]
[DefaultValue("")]
public string Text
{
get
{
return text;
}
set
{
text = value;
}
}
protected override void Render(HtmlTextWriter output)
{
output.Write(Text);
}
}
}
Imports System.ComponentModel
Imports System.Web.UI
Namespace Samples.AspNet.VB.Controls
' Set ControlValueProperty attribute to specify the default
' property of this control that a ControlParameter object
' binds to at run time.
<DefaultProperty("Text"), ControlValueProperty("Text", "DefaultText")> Public Class SimpleCustomControl
Inherits System.Web.UI.WebControls.WebControl
Dim _text As String
<Bindable(True), Category("Appearance"), DefaultValue("")> Property [Text]() As String
Get
Return _text
End Get
Set(ByVal Value As String)
_text = Value
End Set
End Property
Protected Overrides Sub Render(ByVal output As System.Web.UI.HtmlTextWriter)
output.Write([Text])
End Sub
End Class
End Namespace
注解
如果未设置由 属性指定的 Name 属性,请使用 DefaultValue 属性来确定属性的默认值。