三款asp.net 验证码代码(1/2)
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文章提供三种不同风格 asp教程.net 图形验证码代码。
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<title>三款asp.net教程 验证码代码</title>
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<%
<cc1:authcode id="authcode1" runat="server"
imagestyle-imgbgcolor="white" imagestyle-imgbordercolor="deeps教程kyblue" imagestyle-imgnoisecolor="ivory" imagestyle-textcolor1="azure"
imagestyle-textcolor2="ghostwhite" />实现这种功能的关键在于 [designerserializationvisibility(designerserializationvisibility.content)]
以及 typeconverter(typeof(imagestyletypeconver)) 这两个地方。
[designerserializationvisibility(designerserializationvisibility.content)] 提示属性更改好生成
imagestyle-imgbgcolor="white" 这种代码，至于 typeconverter(typeof(imagestyletypeconver))
则主要用于类型转换，具体的见代码里的 imagestyletypeconver 类，该类是继承于
expandableobjectconverter 类的，并且需要实现下面四个重载：
public override bool canconvertfrom(itypedescriptorcontext context, type sourcetype)
{
}
public override bool canconvertto(itypedescriptorcontext context, type destinationtype)
{
}
public override object convertfrom(itypedescriptorcontext context, cultureinfo culture, object value)
{
}
public override object convertto(itypedescriptorcontext context, cultureinfo culture, object value, type destinationtype)
{
}
方法二
asp.net中避免页面多次提交的代码:网页特效< script language="javascript"> < !-- function disableothersubmit() {
var obj = event.srcelement;
var objs = document.getelementsbytagname('input');
for(var i=0; i< objs.length; i++)
{
if(objs[i].type.tolowercase() == 'submit')
{
objs[i].disabled = true;
}
}
} //--> < /script>//asp.net中避免页面多次提交的代码:asp.netpublic class preventmulticlick : system.web.ui.page {
protected system.web.ui.webcontrols.button button1; protected system.web.ui.webcontrols.button button2;
protected system.web.ui.webcontrols.linkbutton linkbutton1; protected system.web.ui.webcontrols.button button3; private void page_load(object sender, system.eventargs e)
{
this.getpostbackeventreference(this.button3);
//保证 __dopostback(eventtarget, eventargument) 精确注册 if(!ispostback)
{
system.text.stringbuilder sb = new system.text.stringbuilder();
sb.append("if (typeof(page_clientvalidate) == 'function')
{
if (page_clientvalidate() == false)
{
return false;
}
}"); //保证考证函数的执行 sb.append("if(window.confirm('are you sure?')==false) return false; ");
//自定义客户端脚本 sb.append("disableothersubmit(); ");
// disable一切submit按钮 sb.append(this.getpostbackeventreference(this.button3));
//用__dopostback来提交，保证按钮的效劳器端click工作执行 sb.append("; ");
button3.attributes.add("onclick",sb.tostring());
}
} #region web form designer generated code override protected void oninit(eventargs e)
{
// // codegen: this call is required by the asp.net web form designer. // initializecomponent();
base.oninit(e);
}
/// < summary> /// required method for designer support - do not modify /// the contents of this method with the code editor. /// < /summary> private void initializecomponent()
{
this.button3.click += new system.eventhandler(this.button3_click); this.load += new system.eventhandler(this.page_load);
}
#endregion private void button3_click(object sender, system.eventargs e)
{
system.threading.thread.sleep(3000);
response.write("hello world!");
}
} 此处只是disable掉一切的submit button, 我感觉其它的可提交控件也是能够经由相似的办法来disable的.
补充：asp.net教程,.Net开发
