自定义控件学习笔记（八）

最新推荐文章于 2025-04-18 15:05:02 发布

最新推荐文章于 2025-04-18 15:05:02 发布 · 76 阅读

文章标签：

#UI #Web #JavaScript #Security #XHTML #ViewUI

自定义控件学习笔记（八）－－第一阶段学习成果总结

1。要点

1)制作了控件 AutoCounter,这个控件中间是一个文本框,左右各有2个按钮,来实现加减中间文本框数字的作用

2)用到了以前7节的全部知识

2。控件

usingSystem;

usingSystem.Web.UI;

usingSystem.Collections.Specialized;

namespaceTestCustomControl

...{

publicclassAutoCounter:Control,IPostBackDataHandler,IPostBackEventHandler

...{

publiceventEventHandlerDecrement;

publiceventEventHandlerIncreMent;

publiceventEventHandlerCountChanged;

publicintCount

...{

get

...{

intcount=0;

if(ViewState["mycount"]!=null)

count=(int)ViewState["mycount"];

returncount;

}

set

...{

ViewState["mycount"]=value;

}

publicboolLoadPostData(stringpostDataKey,NameValueCollectionpostCollection)

...{

inttemp=Count;

try

...{

Count=Convert.ToInt32(postCollection[postDataKey]);

}

catch(FormatException)

...{

Count=0;

}

return(temp!=Count);

}

publicvoidRaisePostDataChangedEvent()

...{

if(CountChanged!=null)

CountChanged(this,newEventArgs());

}

publicvoidRaisePostBackEvent(stringeventArgment)

...{

if(eventArgment=="dec")

...{

Count--;

if(Decrement!=null)

Decrement(this,newEventArgs());

}

elseif(eventArgment=="inc")

...{

Count++;

if(IncreMent!=null)

...{

IncreMent(this,newEventArgs());

}

protectedoverridevoidRender(HtmlTextWriterwriter)

...{

writer.WriteBeginTag("a");

PostBackOptionsopt=newPostBackOptions(this);

opt.Argument="dec";

writer.WriteAttribute("href","javascript:"+Page.ClientScript.GetPostBackEventReference(opt));

writer.Write(HtmlTextWriter.TagRightChar);

writer.Write("dec");

writer.WriteEndTag("a");

writer.WriteBeginTag("input");

writer.WriteAttribute("type","text");

writer.WriteAttribute("name",UniqueID);

if(ID!=null)

writer.WriteAttribute("id",ClientID);

writer.WriteAttribute("value",Count.ToString());

writer.WriteAttribute("size","3");

writer.Write(HtmlTextWriter.TagRightChar);

writer.WriteEndTag("input");

writer.WriteBeginTag("a");

opt=newPostBackOptions(this);

opt.Argument="inc";

writer.WriteAttribute("href","javascript:"+Page.ClientScript.GetPostBackEventReference(opt));

writer.Write(HtmlTextWriter.TagRightChar);

writer.Write("Inc");

writer.WriteEndTag("a");

}

3。用法

前台

<%...@PageLanguage="C#"AutoEventWireup="true"CodeFile="AutoCounter.aspx.cs"Inherits="TestCustomControl_First_AutoCounter"%>

<%...@RegisterAssembly="AutoCounter"TagPrefix="Surance"Namespace="TestCustomControl"%>

<!DOCTYPEhtmlPUBLIC"-//W3C//DTDXHTML1.0Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<htmlxmlns="http://www.w3.org/1999/xhtml">

<headrunat="server">

</head>

<body>

<formid="form1"runat="server">

<div>

<Surance:AutoCounterID="A1"Count="3"OnDecrement="A1_OnDecrement"OnIncreMent="A1_OnIncrement"OnCountChanged="A1_OnCountChanged"runat="server"/>

</div>

</form>

</body>

</html>

后台

usingSystem;

usingSystem.Data;

usingSystem.Configuration;

usingSystem.Collections;

usingSystem.Web;

usingSystem.Web.Security;

usingSystem.Web.UI;

usingSystem.Web.UI.WebControls;

usingSystem.Web.UI.WebControls.WebParts;

usingSystem.Web.UI.HtmlControls;

publicpartialclassTestCustomControl_First_AutoCounter:System.Web.UI.Page

...{

protectedvoidPage_Load(objectsender,EventArgse)

...{

}

protectedvoidA1_OnDecrement(objectsender,EventArgse)

...{

Response.Write("Counteris"+this.A1.Count.ToString());

}

protectedvoidA1_OnIncrement(objectsender,EventArgse)

...{

Response.Write("Counteris"+this.A1.Count.ToString());

}

protectedvoidA1_OnCountChanged(objectsender,EventArgse)

...{

Response.Write("Counteris"+this.A1.Count.ToString());

}