ASP.NET程序中常用的代码

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   在学习ASP.NET中积累的一些小代码,今天与大家分享一下,以后再用的时候直接复制及粘贴就可以了。

 

   1.打开新的窗口并传送参数

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


          传送参数

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

          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?’)"); Button1.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   "’);");         }    

    6.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   "’)");         }  

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

    Redirect会导致post-back的产生而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> 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}<asp:panel style="overflow-x:scroll;overflow-y:auto;"></asp:panel> 






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