ControlValuePropertyAttribute.DefaultValue 屬性

定義

命名空間:

System.Web.UI

組件:

System.Web.dll

取得控制項預設屬性的預設值。

public:
 property System::Object ^ DefaultValue { System::Object ^ get(); };

public object DefaultValue { get; }

member this.DefaultValue : obj

Public ReadOnly Property DefaultValue As Object

屬性值

Object

控制項預設屬性的預設值。

範例

下列程式碼範例示範如何將 屬性套用 ControlValuePropertyAttribute 至自訂控制項來設定 DefaultValue 屬性。

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

備註

未設定屬性所 Name 指定的屬性時，請使用 DefaultValue 屬性來判斷屬性的預設值。

另請參閱

• ControlParameter
• Name