Asp.net中常用的三十三種代碼（一）

 

1. 打開新的窗口並傳送參數：　　
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.爲按鈕添加對話框
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裏
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.獲取錯誤信息併到指定頁面
　　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並進行相應的處理

　　
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的應用程序日誌
    /// </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>
    /// 事件日誌記錄類，提供事件日誌記錄支持
    /// <remarks>
    /// 定義了4個日誌記錄方法 (error, warning, info, trace)
    /// </remarks>
    /// </summary>
    public class ApplicationLog
    {
        /// <summary>
        /// 將錯誤信息記錄到Win2000/NT事件日誌中
        /// <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事件日誌中
        /// <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事件日誌中
        /// <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事件日誌中
        /// <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誌的文本信息格式
        /// <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>格式後的異常信息字符串，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>
        /// 實際事件日誌寫入方法
        /// <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);
                //寫入事件日誌
                eventLog.WriteEntry(messageText, LogEntryType);
            }
            catch { } //忽略任何異常
        }
    } //class ApplicationLog
}



12.Panel 橫向滾動，縱向自動擴展
<asp:panel style="overflow-x:scroll;overflow-y:auto;"></asp:panel>


13.回車轉換成Tab
<script language="javascript" for="document" event="onkeydown">
　if(event.keyCode==13 && event.srcElement.type!='button' && event.srcElement.type!='submit' && 　　　　event.srcElement.type!='reset' && event.srcElement.type!=''&& event.srcElement.type!='textarea');
　　　event.keyCode=9;
</script>


14.DataGrid超級連接列
DataNavigateUrlField="字段名" DataNavigateUrlFormatShttp://xx/inc/delete.aspx?ID={0" target=_blank>http://xx/inc/delete.aspx?ID={0}"