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");
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2.为按钮添加对话框
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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.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()
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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
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<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.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
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日期格式设—ataFormatString="{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.Transfere.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 :)}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}?