<!--
This article provides three different styles of ASP tutorials. NET graphics Verification code.
<%@ page language= "C #" contenttype= "text/html" responseencoding= "gb2312"%>
<!doctype HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "http://www.111cn.net/tr/xhtml1/dtd/ Xhtml1-transitional.dtd ">
<meta http-equiv= "Content-type" content= "text/html; charset=gb2312 "/>
<title> three asp.net tutorial verification code code </title><body>
<%
<cc1:authcode id= "Authcode1" runat= "Server"
Imagestyle-imgbgcolor= "White" imagestyle-imgbordercolor= "Deeps tutorial Kyblue" imagestyle-imgnoisecolor= "Ivory" imagestyle-textcolor1= "Azure"
imagestyle-textcolor2= "Ghostwhite"/>The key to implementing this functionality is [DesignerSerializationVisibility (designerserializationvisibility.content)]
and TypeConverter (typeof (Imagestyletypeconver)) These two places.
[DesignerSerializationVisibility (Designerserializationvisibility.content)] Prompt property to change a good build
Imagestyle-imgbgcolor= "White" This code, as for TypeConverter (typeof (Imagestyletypeconver))
is mainly used for type conversion, specifically see the Imagestyletypeconver class in the code, which inherits from the
Expandableobjectconverter class, and you need to implement the following four overloads:
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 )
{
}
Method Two
asp.net code to avoid multiple submissions of pages: Web effects < 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 code to avoid multiple submissions from the page: 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);
Guaranteed __doPostBack (Eventtarget, eventargument) Accurate registration if (!ispostback)
{
System.Text.StringBuilder sb = new System.Text.StringBuilder ();
Sb.append ("If" (typeof (page_clientvalidate) = = ' function ')
{
if (page_clientvalidate () = = False)
{
return false;
}
}"); To ensure the execution of textual research functions sb.append ("if (window.confirm) (' Are you sure? ') ==false) return false; ");
Custom client Script Sb.append ("Disableothersubmit ();");
Disable all Submit button Sb.append (This.getpostbackeventreference (This.button3));
With __doPostBack to submit, to ensure that the button server click work Execution Sb.append (";");
Button3.attributes.add ("onclick", sb.tostring ());
}
#region Web Form Designer generated code override protected void OnInit (EventArgs e)
{
Codegen:this the call are 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 ' with the Cod E 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!");
}
Here is just disable the submit button, and I feel that other submissions can be disable by similar methods.
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