ASP.Net开发常见问题(1)

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 + "')");

}

★特别注意：【?id=】 处不能为 【?id =】

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

}