Analysis of commonly used code examples in ASP.NET

Y2J
Release: 2017-04-26 10:53:09
Original
1246 people have browsed it

1. Open a new window and send parameters:
Send parameters:

response.write("<script>window.open('*.aspx?id="+this.DropDownList1.SelectIndex+"&id1="+...+"')</script>")
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Receive parameters:

string a = Request.QueryString("id"); 
string b = Request.QueryString("id1");
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2. Add a dialog box for the button

Button1.Attributes.Add("onclick","return confirm('确认?')"); 
button.attributes.add("onclick","if(confirm('are you sure...?')){return true;}else{return false;}")
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3. Delete the selected record in the table

int intEmpID = (int)MyDataGrid.DataKeys[e.Item.ItemIndex]; 
string deleteCmd = "DELETE from Employee where emp_id = " + intEmpID.ToString()
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4. Delete the table record warning

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; 
 } 
}
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5. Click the table row to link another Page

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 + "')"); 
}
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6. Table hyperlink column transfer parameters

<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")%>' />
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7. Click on the table to change color

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='';"); 
}
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8. About date format

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"))
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9. Get the error message and go to the specified page
Don’t use Response.Redirect, but use 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
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10. Clear Cookie

Cookie.Expires=[DateTime]; 
Response.Cookies("UserName").Expires = 0
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11. Custom exception handling

//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 
}
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