ASP.NET程序中常用的15种代码

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1. 打开新的窗口并传送参数:

   传送参数:


CODE:[Copy to clipboard]response.write("<script> window .open('* .asp x?id="+this.DropDownList1.SelectIndex+"&id1="+...+"')</script>")
   接收参数:


CODE:[Copy to clipboard]string a = Request.QueryString("id");
string b = Request.QueryString("id1");
   2.为按钮添加对话框


CODE:[Copy to clipboard]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


CODE:[Copy to clipboard]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


CODE:[Copy to clipboard]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


CODE:[Copy to clipboard]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


CODE:[Copy to clipboard]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


CODE:[Copy to clipboard]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


CODE:[Copy to clipboard]<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


CODE:[Copy to clipboard]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


CODE:[Copy to clipboard]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


CODE:[Copy to clipboard]DataFormatString="{0:yyyy-MM-dd}" 
   我觉得应该在itembound事件中


CODE:[Copy to clipboard]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

   e.g


CODE:[Copy to clipboard]// 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


CODE:[Copy to clipboard]Cookie.Expires=[DateTime];
Response.Cookies("UserName").Expires = 0
   11.自定义异常处理


CODE:[Copy to clipboard]//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 static 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>
    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


CODE:[Copy to clipboard]<asp:panel style="overflow-x:scroll;overflow-y:auto;"></asp:panel>
   13.回车转换成Tab


CODE:[Copy to clipboard]<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


CODE:[Copy to clipboard]DataNavigateUrlField="字段名" DataNavigateUrlFormatString="http://xx/inc/delete.aspx?ID={0}"
   15.DataGrid行随鼠标变色


CODE:[Copy to clipboard]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"+"/"");
  }
}