ASP.NET程序中常用的三十三种代码

asp.net程序中最常用的三十三种编程代码,为初学者多多积累经验,为高手们归纳总结,看了觉得很有价值~,大家不妨参考下!
1. 打开新的窗口并传送参数:
 传送参数:

response.write( " <script>window.open(’*.aspx?id= " + this .DropDownList1.SelectIndex + " &id1= " + + " ’)</script> " )

接收参数:

string a = Request.QueryString( " id " );
string b = Request.QueryString( " id1 " );

2.为按钮添加对话框

Button1.Attributes.Add( " onclick " , " return confirm(’确认?’) " );
button.attributes.add(
" onclick " , " if(confirm(’are you sure?’)){return true;}else{return false;} " )

3.删除表格选定记录

int intEmpID = ( int )MyDataGrid.DataKeys[e.Item.ItemIndex];
string deleteCmd = " DELETE from Employee where emp_id = " + intEmpID.ToString()

4.删除表格记录警告

private void DataGrid_ItemCreated(Object sender,DataGridItemEventArgs e)
{
 
switch(e.Item.ItemType)
 
{
  
case ListItemType.Item :
  
case ListItemType.AlternatingItem :
  
case ListItemType.EditItem:
   TableCell myTableCell;
   myTableCell
= e.Item.Cells[14];
   LinkButton myDeleteButton ;
   myDeleteButton
= (LinkButton)myTableCell.Controls[0];
   myDeleteButton.Attributes.Add(
"onclick","return confirm(’您是否确定要删除这条信息’);");
   
break;
  
default:
   
break;
 }


}

5.点击表格行链接另一页

private void grdCustomer_ItemDataBound( object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
 
//点击表格打开
 if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
  e.Item.Attributes.Add(
"onclick","window.open(’Default.aspx?id="+ e.Item.Cells[0].Text +"’);");
}

双击表格连接到另一页
在itemDataBind事件中

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
 
string OrderItemID =e.item.cells[1].Text;
 
 e.item.Attributes.Add(
"ondblclick", "location.href=’../ShippedGrid.aspx?id="+ OrderItemID +"");
}

双击表格打开新一页

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
 
string OrderItemID =e.item.cells[1].Text;
 
 e.item.Attributes.Add(
"ondblclick", "open(’../ShippedGrid.aspx?id="+ OrderItemID +"’)");
}

★特别注意:【?id=】 处不能为 【?id =】
6.表格超连接列传递参数

<asp:HyperLinkColumn Target = " _blank " headertext = " ID号 " DataTextField = " id " NavigateUrl = " aaa.aspx?id=’
 < % # DataBinder.Eval(Container.DataItem, " 数据字段1 " ) % >’ & name = ’< % # DataBinder.Eval(Container.DataItem, " 数据字段2 " ) % >’ /

7.表格点击改变颜色

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
 e.Item.Attributes.Add(
"onclick","this.style.backgroundColor=’#99cc00’;
    this.style.color=’buttontext’;this.style.cursor=default’;");
}

写在DataGrid的_ItemDataBound里

if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
e.Item.Attributes.Add(
"onmouseover","this.style.backgroundColor=’#99cc00’;
   this.style.color=’buttontext’;this.style.cursor=default’;");
e.Item.Attributes.Add("onmouseout","this.style.backgroundColor=’’;this.style.color=’’;");
}

8.关于日期格式
日期格式设定

DataFormatString = " {0:yyyy-MM-dd} "

在itembound事件中

e.items.cell[ " 你的列 " ].text = DateTime.Parse(e.items.cell[ " 你的列 " ].text.ToString( " yyyy-MM-dd " ))

9.获取错误信息并到指定页面
不要使用Response.Redirect,而应该使用Server.Transfer
// in global.asax

protected void Application_Error(Object sender, EventArgs e) {
if (Server.GetLastError() is HttpUnhandledException)
Server.Transfer(
"MyErrorPage.aspx");

//其余的非HttpUnhandledException异常交给ASP.NET自己处理就okay了 :)
}

Redirect会导致post-back的产生从而丢失了错误信息,所以页面导向应该直接在服务器端执行,这样就可以在错误处理页面得到出错信息并进行相应的处理 。
10.清空Cookie

Cookie.Expires = [DateTime];
Response.Cookies(
" UserName " ).Expires = 0

11.自定义异常处理

// 自定义异常处理类
using System;
using System.Diagnostics;

namespace MyAppException
{
 
/// <summary>
 
/// 从系统异常类ApplicationException继承的应用程序异常处理类。
 
/// 自动将异常内容记录到Windows NT/2000的应用程序日志
 
/// </summary>

 publicclass AppException:System.ApplicationException
 
{
  
public AppException()
  
{
   
if (ApplicationConfiguration.EventLogEnabled)LogEvent("出现一个未知错误。");
  }


 
public AppException(string message)
 
{
  LogEvent(message);
 }


 
public AppException(string message,Exception innerException)
 
{
  LogEvent(message);
  
if (innerException !=null)
  
{
   LogEvent(innerException.Message);
  }

 }


 

// 日志记录类
  using System;
 
using System.Configuration;
 
using System.Diagnostics;
 
using System.IO;
 
using System.Text;
 
using System.Threading;

 
namespace MyEventLog
 
{
  
/// <summary>
  
/// 事件日志记录类,提供事件日志记录支持
  
/// <remarks>
  
/// 定义了4个日志记录方法 (error, warning, info, trace)
  
/// </remarks>
  
/// </summary>

  publicclass ApplicationLog
  
{
   
/// <summary>
   
/// 将错误信息记录到Win2000/NT事件日志中
   
/// <param name="message">需要记录的文本信息</param>
   
/// </summary>

   publicstaticvoid WriteError(String message)
   
{
    WriteLog(TraceLevel.Error, message);
   }


   
/// <summary>
   
/// 将警告信息记录到Win2000/NT事件日志中
   
/// <param name="message">需要记录的文本信息</param>
   
/// </summary>

   publicstaticvoid WriteWarning(String message)
   
{
    WriteLog(TraceLevel.Warning, message);  
   }


   
/// <summary>
   
/// 将提示信息记录到Win2000/NT事件日志中
   
/// <param name="message">需要记录的文本信息</param>
   
/// </summary>

   publicstaticvoid WriteInfo(String message)
   
{
    WriteLog(TraceLevel.Info, message);
   }

   
/// <summary>
   
/// 将跟踪信息记录到Win2000/NT事件日志中
   
/// <param name="message">需要记录的文本信息</param>
   
/// </summary>

   publicstaticvoid WriteTrace(String message)
   
{
    WriteLog(TraceLevel.Verbose, message);
   }


   
/// <summary>
   
/// 格式化记录到事件日志的文本信息格式
   
/// <param name="ex">需要格式化的异常对象</param>
   
/// <param name="catchInfo">异常信息标题字符串.</param>
   
/// <retvalue>
   
/// <para>格式后的异常信息字符串,包括异常内容和跟踪堆栈.</para>
   
/// </retvalue>
   
/// </summary>

   publicstatic String FormatException(Exception ex, String catchInfo)
   
{
    StringBuilder strBuilder
=new StringBuilder();
    
if (catchInfo != String.Empty)
    
{
     strBuilder.Append(catchInfo).Append(
"\r\n");
    }

    strBuilder.Append(ex.Message).Append(
"\r\n").Append(ex.StackTrace);
    
return strBuilder.ToString();
   }


   
/// <summary>
   
/// 实际事件日志写入方法
   
/// <param name="level">要记录信息的级别(error,warning,info,trace).</param>
   
/// <param name="messageText">要记录的文本.</param>
   
/// </summary>

   privatestaticvoid WriteLog(TraceLevel level, String messageText)
   
{
    
try
    
{
     EventLogEntryType LogEntryType;
     
switch (level)
     
{
      
case TraceLevel.Error:
       LogEntryType
= EventLogEntryType.Error;
       
break;
      
case TraceLevel.Warning:
       LogEntryType
= EventLogEntryType.Warning;
       
break;
      
case TraceLevel.Info:
       LogEntryType
= EventLogEntryType.Information;
       
break;
      
case TraceLevel.Verbose:
       LogEntryType
= EventLogEntryType.SuccessAudit;
       
break;
      
default:
       LogEntryType
= EventLogEntryType.SuccessAudit;
       
break;
     }


     EventLog eventLog
=new EventLog("Application", ApplicationConfiguration.EventLogMachineName, ApplicationConfiguration.EventLogSourceName );
     
//写入事件日志
     eventLog.WriteEntry(messageText, LogEntryType);

    }

   
catch{}//忽略任何异常
  }

 }
//class ApplicationLog
}


12.Panel 横向滚动,纵向自动扩展

<asp:panel style = " overflow-x:scroll;overflow-y:auto; " >< / asp:panel>

13.回车转换成Tab

<script language = " javascript " for = " document " event = " onkeydown "
 
if ( event .keyCode == 13 && event .srcElement.type != ’button’ && event .srcElement.type != ’submit’ &&      event .srcElement.type != ’reset’ && event .srcElement.type != ’’ && event .srcElement.type != ’textarea’);
   
event .keyCode = 9 ;
/ script>

onkeydown
= " if(event.keyCode==13) event.keyCode=9 "

14.DataGrid超级连接列

DataNavigateUrlField = " 字段名 " DataNavigateUrlFormatString = " http://xx/inc/delete.aspx?ID={0} "

15.DataGrid行随鼠标变色

private void DGzf_ItemDataBound( object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
 
if (e.Item.ItemType!=ListItemType.Header)
 
{
  e.Item.Attributes.Add(
"onmouseout","this.style.backgroundColor=\""+e.Item.Style["BACKGROUND-COLOR"]+"\"");
  e.Item.Attributes.Add(
"onmouseover","this.style.backgroundColor=\""+ "#EFF3F7"+"\"");
 }

}

16.模板列

<ASP:TEMPLATECOLUMN visible = " False " sortexpression = " demo " headertext = " ID "
<ITEMTEMPLATE>
<ASP:LABEL text
= ’< % # DataBinder.Eval(Container.DataItem, " ArticleID " ) % >’ runat = " server " width = " 80% " id = " lblColumn " /
/ ITEMTEMPLATE>
/ ASP:TEMPLATECOLUMN>

<ASP:TEMPLATECOLUMN headertext
= " 选中 "
<HEADERSTYLE wrap
= " False " horizontalalign = " Center " >< / HEADERSTYLE>
<ITEMTEMPLATE>
<ASP:CHECKBOX id
= " chkExport " runat = " server " /
/ ITEMTEMPLATE>
<EDITITEMTEMPLATE>
<ASP:CHECKBOX id
= " chkExportON " runat = " server " enabled = " true " /
/ EDITITEMTEMPLATE>
/ ASP:TEMPLATECOLUMN>

后台代码

protected void CheckAll_CheckedChanged( object sender, System.EventArgs e)
{
 
//改变列的选定,实现全选或全不选。
 CheckBox chkExport ;
 
if( CheckAll.Checked)
 
{
  
foreach(DataGridItem oDataGridItem in MyDataGrid.Items)
  
{
   chkExport
= (CheckBox)oDataGridItem.FindControl("chkExport");
   chkExport.Checked
=true;
  }

 }

 
else
 
{
  
foreach(DataGridItem oDataGridItem in MyDataGrid.Items)
  
{
   chkExport
= (CheckBox)oDataGridItem.FindControl("chkExport");
   chkExport.Checked
=false;
  }

 }

}


17.数字格式化

【< % #Container.DataItem( " price " ) % >的结果是500. 0000 ,怎样格式化为500. 00 ?

% #Container.DataItem( " price " , " {0:¥#,##0.00} " ) %

int i = 123456 ;
string s = i.ToString( " ###,###.00 " );

18.日期格式化

【aspx页面内:< % # DataBinder.Eval(Container.DataItem, " Company_Ureg_Date " ) %

  显示为:
2004 - 8 - 11 19 : 44 : 28

  我只想要:
2004 - 8 - 11

% # DataBinder.Eval(Container.DataItem, " Company_Ureg_Date " , " {0:yyyy-M-d} " ) %

  应该如何改?

  【格式化日期】

  取出来,一般是object((DateTime)objectFromDB).ToString(
" yyyy-MM-dd " );

日期的验证表达式
A.以下正确的输入格式: [2004-2-29], [2004-02-29 10:29:39 pm], [2004/12/31]

^ ((\d {2} (([ 02468 ][ 048 ]) | ([ 13579 ][ 26 ]))[\ - \ / \s] ? (((( 0 ? [ 13578 ]) | ( 1 [ 02 ]))[\ - \ / \s] ? (( 0 ? [ 1 - 9 ]) | ([ 1 - 2 ][ 0 - 9 ]) | ( 3 [ 01 ]))) | ((( 0 ? [ 469 ]) | ( 11 ))[\ - \ / \s] ? (( 0 ? [ 1 - 9 ]) | ([ 1 - 2 ][ 0 - 9 ]) | ( 30 ))) | ( 0 ? 2 [\ - \ / \s] ? (( 0 ? [ 1 - 9 ]) | ([ 1 - 2 ][ 0 - 9 ]))))) | (\d {2} (([ 02468 ][ 1235679 ]) | ([ 13579 ][ 01345789 ]))[\ - \ / \s] ? (((( 0 ? [ 13578 ]) | ( 1 [ 02 ]))[\ - \ / \s] ? (( 0 ? [ 1 - 9 ]) | ([ 1 - 2 ][ 0 - 9 ]) | ( 3 [ 01 ]))) | ((( 0 ? [ 469 ]) | ( 11 ))[\ - \ / \s] ? (( 0 ? [ 1 - 9 ]) | ([ 1 - 2 ][ 0 - 9 ]) | ( 30 ))) | ( 0 ? 2 [\ - \ / \s] ? (( 0 ? [ 1 - 9 ]) | ( 1 [ 0 - 9 ]) | ( 2 [ 0 - 8 ]))))))(\s((( 0 ? [ 1 - 9 ]) | ( 1 [ 0 - 2 ]))\:([ 0 - 5 ][ 0 - 9 ])((\s) | (\:([ 0 - 5 ][ 0 - 9 ])\s))([AM | PM | am | pm] {2,2} ))) ? $

B.以下正确的输入格式:[0001-12-31], [9999 09 30], [2002/03/03]

^ \d {4} [\ - \ / \s] ? (((( 0 [ 13578 ]) | ( 1 [ 02 ]))[\ - \ / \s] ? (([ 0 - 2 ][ 0 - 9 ]) | ( 3 [ 01 ]))) | ((( 0 [ 469 ]) | ( 11 ))[\ - \ / \s] ? (([ 0 - 2 ][ 0 - 9 ]) | ( 30 ))) | ( 02 [\ - \ / \s] ? [ 0 - 2 ][ 0 - 9 ]))$

大小写转换

HttpUtility.HtmlEncode( string );
HttpUtility.HtmlDecode(
string )

19.如何设定全局变量

Global.asax中

  Application_Start()事件中

  添加Application[属性名] = xxx;

  就是你的全局变量

20.怎样作到HyperLinkColumn生成的连接后,点击连接,打开新窗口?
HyperLinkColumn有个属性Target,将器值设置成"_blank"即可.(Target="_blank") 。【ASPNETMENU】点击菜单项弹出新窗口。在你的menuData.xml文件的菜单项中加入URLTarget="_blank",如:

? xml version = " 1.0 " encoding = " GB2312 " ?
<MenuData ImagesBaseURL
= " images/ "
<MenuGroup>
<MenuItem Label
= " 内参信息 " URL = " Infomation.aspx "
<MenuGroup ID
= " BBC "
<MenuItem Label
= " 公告信息 " URL = " Infomation.aspx " URLTarget = " _blank " LeftIcon = " file.gif " /
<MenuItem Label
= " 编制信息简报 " URL = " NewInfo.aspx " LeftIcon = " file.gif " /

最好将你的aspnetmenu升级到1.2版
21.读取DataGrid控件TextBox值

foreach (DataGrid dgi in yourDataGrid.Items)
{
 TextBox tb
= (TextBox)dgi.FindControl("yourTextBoxId");
 tb.Text.
}

23.在DataGrid中有3个模板列包含Textbox分别为 DG_ShuLiang (数量) DG_DanJian(单价) DG_JinE(金额)分别在5.6.7列,要求在录入数量及单价的时候自动算出金额即:数量*单价=金额还要求录入时限制为 数值型.我如何用客户端脚本实现这个功能?

<asp:TemplateColumn HeaderText = " 数量 "
<ItemTemplate>
<asp:TextBox id
= " ShuLiang " runat = ’server’ Text = ’< % # DataBinder.Eval(Container.DataItem, " DG_ShuLiang " ) % >’
onkeyup
= " javascript:DoCal() "
/

<asp:RegularExpressionValidator id
= " revS " runat = " server " ControlToValidate = " ShuLiang " ErrorMessage = " must be integer " ValidationExpression = " ^\d+$ " /
/ ItemTemplate>
/ asp:TemplateColumn>

<asp:TemplateColumn HeaderText
= " 单价 "
<ItemTemplate>
<asp:TextBox id
= " DanJian " runat = ’server’ Text = ’< % # DataBinder.Eval(Container.DataItem, " DG_DanJian " ) % >’
onkeyup
= " javascript:DoCal() "
/

<asp:RegularExpressionValidator id
= " revS2 " runat = " server " ControlToValidate = " DanJian " ErrorMessage = " must be numeric " ValidationExpression = " ^\d+(\.\d*)?$ " /

/ ItemTemplate>
/ asp:TemplateColumn>

<asp:TemplateColumn HeaderText
= " 金额 "
<ItemTemplate>
<asp:TextBox id
= " JinE " runat = ’server’ Text = ’< % # DataBinder.Eval(Container.DataItem, " DG_JinE " ) % >’ /
/ ItemTemplate>
/ asp:TemplateColumn><script language = " javascript "
function DoCal()
{
 var e
=event.srcElement;
 var row
= e.parentNode.parentNode;
 var txts
= row.all.tags("INPUT");
 
if (!txts.length || txts.length < 3)
  
return;

 var q
= txts[txts.length-3].value;
 var p
= txts[txts.length-2].value;

 
if (isNaN(q) || isNaN(p))
  
return;

 q
= parseInt(q);
 p
= parseFloat(p);

 txts[txts.length
-1].value = (q * p).toFixed(2);
}

/ script>

24.datagrid选定比较底下的行时,为什么总是刷新一下,然后就滚动到了最上面,刚才选定的行因屏幕的关系就看不到了。

page_load
page.smartNavigation
= true

25.在Datagrid中修改数据,当点击编辑键时,数据出现在文本框中,怎么控制文本框的大小 ?

private void DataGrid1_ItemDataBound(obj sender,DataGridItemEventArgs e)
{
 
for(int i=0;i<e.Item.Cells.Count-1;i++)
  
if(e.Item.ItemType==ListItemType.EditType)
  
{
   e.Item.Cells[i].Attributes.Add(
"Width", "80px")
  }

}

26.对话框

private static string ScriptBegin = " <script language=\ " JavaScript\ " " ;
private static string ScriptEnd = " </script> " ;

public static void ConfirmMessageBox( string PageTarget, string Content)
{
 
string ConfirmContent="var retValue=window.confirm(’"+Content+"’);"+"if(retValue){window.location=’"+PageTarget+"’;}";

 ConfirmContent
=ScriptBegin + ConfirmContent + ScriptEnd;

 Page ParameterPage
= (Page)System.Web.HttpContext.Current.Handler;
 ParameterPage.RegisterStartupScript(
"confirm",ConfirmContent);
 
//Response.Write(strScript);
}


 

27. 将时间格式化:
2007年02月01日

string aa = DateTime.Now.ToString( " yyyy年MM月dd日 " );

1.1 取当前年月日时分秒

currentTime = System.DateTime.Now;

1.2 取当前年

int = DateTime.Now.Year;

1.3 取当前月

int = DateTime.Now.Month;

1.4 取当前日

int = DateTime.Now.Day;

1.5 取当前时

int = DateTime.Now.Hour;

1.6 取当前分

int = DateTime.Now.Minute;

1.7 取当前秒

int = DateTime.Now.Second;

1.8 取当前毫秒

int 毫秒 = DateTime.Now.Millisecond;

28.自定义分页代码:

先定义变量 :

public static int pageCount; // 总页面数
public static int curPageIndex = 1 ; // 当前页面

  下一页:

if (DataGrid1.CurrentPageIndex < (DataGrid1.PageCount - 1 ))
{
 DataGrid1.CurrentPageIndex
+=1;
 curPageIndex
+=1;
}


bind();
// DataGrid1数据绑定函数

  上一页:

if (DataGrid1.CurrentPageIndex > 0 )
{
 DataGrid1.CurrentPageIndex
+=1;
 curPageIndex
-=1;
}


bind();
// DataGrid1数据绑定函数

  直接页面跳转:

int a = int .Parse(JumpPage.Value.Trim()); // JumpPage.Value.Trim()为跳转值

if (a<DataGrid1.PageCount)
{
 
this.DataGrid1.CurrentPageIndex=a;
}


bind();

29.DataGrid使用:
1.1 添加删除确认

private void DataGrid1_ItemCreated( object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
 
foreach(DataGridItem di inthis.DataGrid1.Items)
 
{
  
if(di.ItemType==ListItemType.Item||di.ItemType==ListItemType.AlternatingItem)
  
{
   ((LinkButton)di.Cells[
8].Controls[0]).Attributes.Add("onclick","return confirm(’确认删除此项吗?’);");
  }

 }

}


  

1.2 样式交替:

ListItemType itemType = e.Item.ItemType;

if (itemType == ListItemType.Item )
{
 e.Item.Attributes[
"onmouseout"] ="javascript:this.style.backgroundColor=’#FFFFFF’;";
 e.Item.Attributes[
"onmouseover"] ="javascript:this.style.backgroundColor=’#d9ece1’;cursor=’hand’;" ;
}

else if ( itemType == ListItemType.AlternatingItem)
{
 e.Item.Attributes[
"onmouseout"] ="javascript:this.style.backgroundColor=’#a0d7c4’;";
 e.Item.Attributes[
"onmouseover"] ="javascript:this.style.backgroundColor=’#d9ece1’;cursor=’hand’;" ;
}


  

1.3 添加一个编号列

DataTable dt = c.ExecuteRtnTableForAccess(sqltxt); // 执行sql返回的DataTable
DataColumn dc = dt.Columns.Add( " number " ,System.Type.GetType( " System.String " ));

for ( int i = 0 ;i<dt.Rows.Count;i ++ )
{
 dt.Rows[i][
"number"]=(i+1).ToString();
}


DataGrid1.DataSource
= dt;
DataGrid1.DataBind();

 //DataGrid1中添加一个CheckBox,页面中添加一个全选框

private void CheckBox2_CheckedChanged( object sender, System.EventArgs e)
{
 
foreach(DataGridItem thisitem in DataGrid1.Items)
 
{
  ((CheckBox)thisitem.Cells[
0].Controls[1]).Checked=CheckBox2.Checked;
 }

}


  

1.4 将当前页面中DataGrid1显示的数据全部删除

foreach (DataGridItem thisitem in DataGrid1.Items)
{
 
if(((CheckBox)thisitem.Cells[0].Controls[1]).Checked)
 
{
  
string strloginid= DataGrid1.DataKeys[thisitem.ItemIndex].ToString();
  Del (strloginid);
//删除函数
 }

}

30.当文件在不同目录下,需要获取数据库连接字符串(如果连接字符串放在Web.config,然后在Global.asax中初始化)
在Application_Start中添加以下代码

Application[ " ConnStr " ] = this .Context.Request.PhysicalApplicationPath + ConfigurationSettings.
   AppSettings[
" ConnStr " ].ToString();

31.变量.ToString()

12345 .ToString( " n " ); // 生成 12,345.00
12345 .ToString( " C " ); // 生成 ¥12,345.00
12345 .ToString( " e " ); // 生成 1.234500e+004
12345 .ToString( " f4 " ); // 生成 12345.0000
12345 .ToString( " x " ); // 生成 3039 (16进制)
12345 .ToString( " p " ); // 生成 1,234,500.00%

32、变量.Substring(参数1,参数2);
截取字串的一部分,参数1为左起始位数,参数2为截取几位。 如:

string s1 = str.Substring( 0 , 2 );

33.在自己的网站上登陆其他网站:(如果你的页面是通过嵌套方式的话,因为一个页面只能有一个FORM,这时可以导向另外一个页面再提交登陆信息)

<SCRIPT language = " javascript "
!--
 function gook(pws)
 
{
  frm.submit();
 }

// -->

/ SCRIPT> <body leftMargin = " 0 " topMargin = " 0 " onload = " javascript:gook() " marginwidth = " 0 " marginheight = " 0 "
<form name
= " frm " action = " http://220.194.55.68:6080/login.php?retid=7259 " method = " post "
<tr>
<td>
<input id
= " f_user " type = " hidden " size = " 1 " name = " f_user " runat = " server "
<input id
= " f_domain " type = " hidden " size = " 1 " name = " f_domain " runat = " server "
<input
class = " box " id = " f_pass " type = " hidden " size = " 1 " name = " pwshow " runat = " server "

<INPUT id
= " lng " type = " hidden " maxLength = " 20 " size = " 1 " value = " 5 " name = " lng "
<INPUT id
= " tem " type = " hidden " size = " 1 " value = " 2 " name = " tem "

/ td>

/ tr>

/ form>

  文本框的名称必须是你要登陆的网页上的名称,如果源码不行可以用vsniffer 看看。

  下面是获取用户输入的登陆信息的代码:

string name;
name
= Request.QueryString[ " EmailName " ];

try
{
 
int a=name.IndexOf("@",0,name.Length);
 f_user.Value
=name.Substring(0,a);
 f_domain.Value
=name.Substring(a+1,name.Length-(a+1));
 f_pass.Value
=Request.QueryString["Psw"];
}


catch
{
 Script.Alert(
"错误的邮箱!");
 Server.Transfer(
"index.aspx");
}

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