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ASP.NET常用编程代码(一)

作者:佚名      ASP.NET网站开发编辑:admin      更新时间:2022-07-23

asp.net常用编程代码(一)

1.为按钮添加确认对话框

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

2.删除表格选定记录

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

3.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: // 编辑项   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; }}

4.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 + "’);");}

5.双击表格连接到另一页

在itemDataBound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 + "’");}

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")%>’/>

8.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’;");}

9.在表格行中移动鼠标时改变颜色

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=’’;");}

10.关于日期格式

// 日期格式设定

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

// 写在itembound事件中

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

11.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.asaxprotected 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 :)}

注: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。

12.清空Cookie

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

13.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}

14.Panel横向滚动,纵向自动扩展

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

15.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"

16.DataGrid超级连接列

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

17.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( "onmouseo