欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  后端开发

ASP.NET中常用的种代码实例解析

程序员文章站 2022-04-10 22:22:40
...
1. 打开新的窗口并传送参数:
传送参数:
response.write("<script>window.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

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

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

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 
}

以上就是ASP.NET中常用的种代码实例解析的详细内容,更多请关注其它相关文章!

相关标签: ASP.NET 种代码