ASP.Net開發 常用技巧1

一位ASP.net初學者學習過程中整理的備忘錄，包括“開啟新的視窗並傳送參數，為按鈕添加對話方塊，刪除表格選定記錄，刪除表格記錄警告”等等常見問題的解決方案。

1. 開啟新 的視窗並傳送參數：　　傳送參數：response.write("<script>window.open('*.aspx?id="+this.DropDownList1.SelectIndex+"&id1="+...+"')</script>")　　接收參數：string a = Request.QueryString("id");string b = Request.QueryString("id1");2.為按鈕添加對話方塊Button1.Attributes.Add("onclick","return confirm('確認?')");button.attributes.add("onclick","if(confirm('are you sure...?')){return true;}else{return false;}")3.刪除表格選定記錄int intEmpID = (int)MyDataGrid.DataKeys[e.Item.ItemIndex];string deleteCmd = "DELETE from Employee where emp_id = " + intEmpID.ToString()4.刪除表格記錄警告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('您是否確定要刪除這條資訊');");break;default:break;}}5.點擊表格行連結另一頁private void grdCustomer_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e){//點擊表格開啟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 + "');");}　　雙擊表格串連到另一頁，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 + "'");}　　雙擊表格開啟新一頁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 + "')");}　　★特別注意：【?id=】 處不能為 【?id =】6.表格超串連列傳遞參數<asp:HyperLinkColumn Target="_blank" headertext="ID號" DataTextField="id" NavigateUrl="aaa.aspx?id='<%# DataBinder.Eval(Container.DataItem, "資料欄位1")%>'& name='<%# DataBinder.Eval(Container.DataItem, "資料欄位2")%>' />7.表格點擊改變顏色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';");}寫在DataGrid的_ItemDataBound裡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.關於日期格式　　日期格式設定DataFormatString="{0:yyyy-MM-dd}"　　我覺得應該在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.擷取錯誤資訊併到指定頁面

　　不要使用Response.Redirect,而應該使用Server.Transfer　　e.g// in glob al.asaxprotected void Application_Error(Object sender, EventArgs e) {if (Server.GetLastError() is HttpUnhandledException)Server.Transfer("MyErrorPage.aspx");//其餘的非HttpUnhandledException異常交給ASP.NET自己處理就okay了 }　　Redirect會導致post－back的產生從而丟失了錯誤資訊，所以頁面導嚮應該直接在伺服器端執行，這樣就可以在錯誤處理頁面得到出錯資訊並進行相應的處理10.清空CookieCookie.Expires=[DateTime];Response.Cookies("UserName").Expires = 011.自訂異常處理//自訂異常處理類 using System;using System.Diagnostics;namespace MyAppException{/// <summary>/// 從系統異常類ApplicationException繼承的應用程式異常處理類。/// 自動將異常內容記錄到Windows NT/2000的應用程式記錄檔/// </summary>public class AppException:System.ApplicationException{public AppException(){if (ApplicationConfiguration.EventLogEnabled)LogEvent("出現一個未知錯誤。");}public AppException(string message){LogEvent(message);}public AppException(string message,Exception innerException){LogEvent(message);if (innerException != null){LogEvent(innerException.Message);}}//日誌記錄類using System;using System.Configuration;using System.Diagnostics;using System.IO;using System.Text;using System.Threading;namespace MyEventLog{/// <summary>/// 事件記錄記錄類，提供事件記錄記錄支援 /// <remarks>/// 定義了4個日誌記錄方法 (error, warning, info, trace) /// </remarks>/// </summary>public class ApplicationLog{/// <summary>/// 將錯誤資訊記錄到Win2000/NT事件記錄中/// <param name="message">需要記錄的文本資訊</param>/// </summary>public static void WriteError(String message){WriteLog(TraceLevel.Error, message);}/// <summary>/// 將警告資訊記錄到Win2000/NT事件記錄中/// <param name="message">需要記錄的文本資訊</param>/// </summary>public static void WriteWarning(String message){WriteLog(TraceLevel.Warning, message);}/// <summary>/// 將提示資訊記錄到Win2000/NT事件記錄中/// <param name="message">需要記錄的文本資訊</param>/// </summary>public static void WriteInfo(String message){WriteLog(TraceLevel.Info, message);}/// <summary>/// 將跟蹤資訊記錄到Win2000/NT事件記錄中/// <param name="message">需要記錄的文本資訊</param>/// </summary>public static void WriteTrace(String message){WriteLog(TraceLevel.Verbose, message);}/// <summary>/// 格式化記錄到事件記錄的文本資訊格式/// <param name="ex">需要格式化的異常對象</param>/// <param name="catchInfo">異常資訊標題字串.</param>/// <retvalue>/// <para>格式後的異常資訊字串，包括異常內容和跟蹤堆棧.</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>/// 實際事件記錄寫入方法/// <param name="level">要記錄資訊的層級（error,warning,info,trace).</param>/// <param name="messageText">要記錄的文本.</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 );//寫入事件記錄eventLog.WriteEntry(messageText, LogEntryType);}catch {} //忽略任何異常} } //class ApplicationLog}