ASP.NET常用语句33条代码

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1. 打开新的窗口并传送参数:

<!--

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-->传送参数:

  response.write(
"")

  接收参数:

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

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

         2.为按钮添加对话框

<!--

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-->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

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-->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

<!--

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-->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

<!--

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-->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+ "’)");

  }

 

  6.表格超连接列传递参数

<!--

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-->& name=’’/>

  7.表格点击改变颜色

<!--

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-->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

<!--

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-->日期格式设定

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

  我觉得应该在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

<!--

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-->e.g


  
// 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

<!--

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-->Cookie.Expires=[DateTime];

  Response.Cookies(
"UserName").Expires= 0

 

  11.自定义异常处理

<!--

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-->//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>
 
public class 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>
  
public class 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>
   
public static void 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>
   
public static void 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>
   
public static void 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>
   
public static void 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>
   
public staticString 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>
   
private static void 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

<!--

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

  13.回车转换成Tab

<!--

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

        14.DataGrid超级连接列

<!--

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

  15.DataGrid行随鼠标变色

<!--

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-->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

<!--

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--><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

<!--

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-->【的结果是500.0000,怎样格式化为500.00?】


  
int i=123456;

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

     18.日期格式化

<!--

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-->【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], [2004-02-2910:29:39 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], [999909 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

<!--

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-->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?

<!--

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-->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

<!--

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-->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?

<!--

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-->〖思归〗

<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。

<!--

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-->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 ?

<!--

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-->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

<!--

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-->private staticstring ScriptBegin= "";

  
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.  

<!--

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-->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:

<!--

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-->先定义变量 :

public staticint pageCount;//总页面数
public staticint 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:

<!--

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-->添加删除确认:

private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
 foreach(DataGridItem di in this.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?’);");
  }
 }
}
  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’;" ;
}
  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;
 }
}
  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:

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

-->Application["ConnStr"]=this.Context.Request.PhysicalApplicationPath+ConfigurationSettings.

  AppSettings[
"ConnStr"].ToString();

 

    31. 变量.ToString()

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

-->字符型转换 转为字符串

  
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)

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

--><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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