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小編給大家分享一下ASP.NET中常用的代碼示例,希望大家閱讀完這篇文章之后都有所收獲,下面讓我們一起去探討吧!
1. 打開新的窗口并傳送參數:
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.為按鈕添加對話框
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信息');"); break; default: break; } }
5.點擊表格行鏈接另一頁
private void grdCustomer_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { //點擊表格打開 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 + "');"); } 雙擊表格連接到另一頁 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 + "'"); } 雙擊表格打開新一頁 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 + "')"); }
6.表格超連接列傳遞參數
<asp:HyperLinkColumn Target="_blank" headertext="ID號" DataTextField="id" NavigateUrl="aaa.aspx?id=' <%# DataBinder.Eval(Container.DataItem, "數據字段1")%>' & name='<%# DataBinder.Eval(Container.DataItem, "數據字段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.關于日期格式
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.獲取錯誤信息并到指定頁面
不要使用Response.Redirect,而應該使用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信息,所以頁面導向應該直接在服務器端執行,這樣就可以在錯誤處理頁面得到出錯信息并進行相應的處理
10.清空Cookie
Cookie.Expires=[DateTime]; Response.Cookies("UserName").Expires = 0
11.自定義異常處理
//自定義異常處理類 using System; using System.Diagnostics; namespace MyAppException { /// <summary> /// 從系統異常類ApplicationException繼承的應用程序異常處理類。 /// 自動將異常內容記錄到Windows NT/2000的應用程序日志 /// </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); } } //日志記錄類 using System; using System.Configuration; using System.Diagnostics; using System.IO; using System.Text; using System.Threading; namespace MyEventLog { /// <summary> /// 事件日志記錄類,提供事件日志記錄支持 /// <remarks> /// 定義了4個日志記錄方法 (error, warning, info, trace) /// </remarks> /// </summary> public class ApplicationLog { /// <summary> /// 將錯誤信息記錄到Win2000/NT事件日志中 /// <param name="message">需要記錄的文本信息</param> /// </summary> public static void WriteError(String message) { WriteLog(TraceLevel.Error, message); } /// <summary> /// 將警告信息記錄到Win2000/NT事件日志中 /// <param name="message">需要記錄的文本信息</param> /// </summary> public static void WriteWarning(String message) { WriteLog(TraceLevel.Warning, message); } /// <summary> /// 將提示信息記錄到Win2000/NT事件日志中 /// <param name="message">需要記錄的文本信息</param> /// </summary> public static void WriteInfo(String message) { WriteLog(TraceLevel.Info, message); } /// <summary> /// 將跟蹤信息記錄到Win2000/NT事件日志中 /// <param name="message">需要記錄的文本信息</param> /// </summary> public static void WriteTrace(String message) { WriteLog(TraceLevel.Verbose, message); } /// <summary> /// 格式化記錄到事件日志的文本信息格式 /// <param name="ex">需要格式化的異常對象</param> /// <param name="catchInfo">異常信息標題字符串.</param> /// <retvalue> /// <para>格式后的異常信息字符串,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> /// 實際事件日志寫入方法 /// <param name="level">要記錄信息的級別(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 ); //寫入事件日志 eventLog.WriteEntry(messageText, LogEntryType); } catch {} //忽略任何異常 } } //class ApplicationLog }
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