ASP.NET Tutorial/Custom Controls/Extends WebControl

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Adding a Web Control Library to a Web page

<%@ Register Assembly="ClassLibrary1" Namespace="ClassLibrary1" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" 
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Adding a Custom Web Control</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <cc1:WebCustomControl1 ID="WebCustomControl1_1" runat="server" />
    </div>
    </form>
</body>
</html>
File: WebCustomControl1_1.cs
Imports System.ruponentModel
Imports System.Web.UI
<DefaultProperty("Text"), _
 ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")> 
Public Class WebCustomControl1
    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


Rendering HTML tag attributes (C#)

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebControlLibrary1
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
    public class WebCustomControl1 : 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.RenderBeginTag(HtmlTextWriterTag.Div);
            output.AddAttribute(HtmlTextWriterAttribute.Type, "text");
            output.AddAttribute(HtmlTextWriterAttribute.Id, this.ClientID);
            output.AddAttribute(HtmlTextWriterAttribute.Name, this.ClientID);
            output.AddAttribute(HtmlTextWriterAttribute.Value, this.Text);
            output.RenderBeginTag(HtmlTextWriterTag.Input);
            output.RenderEndTag();
            output.RenderEndTag();
        } 
    }
}


Rendering HTML tag attributes (VB)

Imports System.ruponentModel
Imports System.Web.UI
<DefaultProperty("Text"), _
 ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")> 
Public Class WebCustomControl1
    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.RenderBeginTag(HtmlTextWriterTag.Div)
        output.AddAttribute(HtmlTextWriterAttribute.Type, "text")
        output.AddAttribute(HtmlTextWriterAttribute.Id, Me.ClientID)
        output.AddAttribute(HtmlTextWriterAttribute.Name, Me.ClientID)
        output.AddAttribute(HtmlTextWriterAttribute.Value, Me.Text)
        output.RenderBeginTag(HtmlTextWriterTag.Input)
        output.RenderEndTag()
        output.RenderEndTag()
    End Sub

End Class


The Visual Studio Web Control Library class template (C#)

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebControlLibrary1
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
    public class WebCustomControl1 : 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);
        }
    }
}


The Visual Studio Web Control Library class template (VB)

Imports System.ruponentModel
Imports System.Web.UI
<DefaultProperty("Text"), _
 ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")> 
Public Class WebCustomControl1
    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


Using the HtmlTextWriter to render an HTML tag (C#)

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebControlLibrary1
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
    public class WebCustomControl1 : 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.RenderBeginTag(HtmlTextWriterTag.Input);
            output.RenderEndTag();
        }
    }
}


Using the HtmlTextWriter to render an HTML tag (VB)

Imports System.ruponentModel
Imports System.Web.UI
<DefaultProperty("Text"), _
 ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")> 
Public Class WebCustomControl1
    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.RenderBeginTag(HtmlTextWriterTag.Input)
        output.RenderEndTag()
    End Sub
End Class


Using the HtmlTextWriter to render multiple HTML tags (C#)

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebControlLibrary1
{
    [DefaultProperty("Text")]
    [ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
    public class WebCustomControl1 : 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.RenderBeginTag(HtmlTextWriterTag.Div);
            output.RenderBeginTag(HtmlTextWriterTag.Input);
            output.RenderEndTag();
            output.RenderEndTag();
        }
    }
}


Using the HtmlTextWriter to render multiple HTML tags (VB)

Imports System.ruponentModel
Imports System.Web.UI
<DefaultProperty("Text"), _
 ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")> 
Public Class WebCustomControl1
    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.RenderBeginTag(HtmlTextWriterTag.Div)
        output.RenderBeginTag(HtmlTextWriterTag.Input)
        output.RenderEndTag()
        output.RenderEndTag()
    End Sub
End Class
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Custom_Controls/Extends_WebControl&oldid=3309»