ASP.NET程式中常用的三十三種代碼一

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上載者:User
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 + "’)");
}

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 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Cookie

Cookie.Expires=[DateTime];
Response.Cookies("UserName").Expires = 0
  
11.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
}

 12.Panel 橫向滾動,縱向自動擴充

<asp:panel style="overflow-x:scroll;overflow-y:auto;"></asp:panel>
  
13.斷行符號轉換成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>

onkeydown="if(event.keyCode==13) event.keyCode=9"

  
14.DataGrid超級串連列

DataNavigateUrlField="欄位名" DataNavigateUrlFormatString="http://xx/inc/delete.aspx?ID={0}"
  
15.DataGrid行隨滑鼠變色

private void DGzf_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
 if (e.Item.ItemType!=ListItemType.Header)
 {
  e.Item.Attributes.Add( "onmouseout","this.style.backgroundColor=\""+e.Item.Style["BACKGROUND-COLOR"]+"\"");
  e.Item.Attributes.Add( "onmouseover","this.style.backgroundColor=\""+ "#EFF3F7"+"\"");
 }
}

16.模板列

<ASP:TEMPLATECOLUMN visible="False" sortexpression="demo" headertext="ID">
<ITEMTEMPLATE>
<ASP:LABEL text=’<%# DataBinder.Eval(Container.DataItem, "ArticleID")%>’ runat="server" width="80%" id="lblColumn" />
</ITEMTEMPLATE>
</ASP:TEMPLATECOLUMN>

<ASP:TEMPLATECOLUMN headertext="選中">
<HEADERSTYLE wrap="False" horizontalalign="Center"></HEADERSTYLE>
<ITEMTEMPLATE>
<ASP:CHECKBOX id="chkExport" runat="server" />
</ITEMTEMPLATE>
<EDITITEMTEMPLATE>
<ASP:CHECKBOX id="chkExportON" runat="server" enabled="true" />
</EDITITEMTEMPLATE>
</ASP:TEMPLATECOLUMN>
  後台代碼

protected void CheckAll_CheckedChanged(object sender, System.EventArgs e)
{
 //改變列的選定,實現全選或全不選。
 CheckBox chkExport ;
 if( CheckAll.Checked)
 {
  foreach(DataGridItem oDataGridItem in MyDataGrid.Items)
  {
   chkExport = (CheckBox)oDataGridItem.FindControl("chkExport");
   chkExport.Checked = true;
  }
 }
 else
 {
  foreach(DataGridItem oDataGridItem in MyDataGrid.Items)
  {
   chkExport = (CheckBox)oDataGridItem.FindControl("chkExport");
   chkExport.Checked = false;
  }
 }
}
  
17.數字格式化

  【<%#Container.DataItem("price")%>的結果是500.0000,怎樣格式化為500.00?】

<%#Container.DataItem("price","{0:¥#,##0.00}")%>

int i=123456;
string s=i.ToString("###,###.00");

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