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ASP.NET程序常用代码

2012年03月13日 ⁄ 综合 ⁄ 共 6704字 ⁄ 字号 评论关闭
 

ASP.NET程序中常用的三十三种代码

1. 打开新的窗口并传送参数:

  传送参数:

response.write("scriptwindow.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 + "’)");
}


6.
表格超连接列传递参数

asp:HyperLinkColumn Target="_blank" headertext="ID" 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_ItemDataBound

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}"


  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

  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 :)
}


  Redirect会导致postback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
 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

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"

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