ASP.NET程式中常用的33種程式碼

摘要:ASP.NET程式中常用的33種程式碼

1. 打開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.為按鈕新增對話方塊


Button1.Attributes.Add("onclick","return confirm(’確認?’)");
button.attributes.add("onclick","if(confirm(’are you sure...?’)){return true;}else{return false;}")


(小馬註:其實在ASP.NET 2.0已經有OnClientClick事件可以用了,程式碼的易讀性比用Attributes高,比較推薦使用)

3.刪除表格指定紀錄


int intEmpID = (int)MyDataGrid.DataKeys[e.Item.ItemIndex];
string deleteCmd = "DELETE from Employee where emp_id = " + intEmpID.ToString()



4.刪除表格紀錄警告


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 + "’");
}


雙擊表格另開新頁


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.表格超連結列傳遞參數
<asp:HyperLinkColumn Target="_blank" headertext="ID號" DataTextField="id" NavigateUrl="aaa.aspx?id=’
 <%# DataBinder.Eval(Container.DataItem, "數據欄位1")%>’ & name=’<%# DataBinder.Eval(Container.DataItem, "數據欄位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.獲取錯誤資訊並到指定頁面
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HttpUnhandledExceptionException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,所以頁面導向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.自定義Exception處理


//自定義Exception處理類別
using System;
using System.Diagnostics;
namespace MyAppException
{
 /// <summary>
 /// 從系統Exception類別ApplicationException繼承的應用程式Exception處理類別。
 /// 自動將Exception內容紀錄到Windows NT/2000的應用程式日誌
 /// </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);
  }
 }
 //日誌紀錄類別
 using System;
 using System.Configuration;
 using System.Diagnostics;
 using System.IO;
 using System.Text;
 using System.Threading;
 namespace MyEventLog
 {
  /// <summary>
  /// 事件日誌紀錄類別,提供事件日誌紀錄支援
  /// <remarks>
  /// 定義了4個日誌紀錄方法 (error, warning, info, trace)
  /// </remarks>
  /// </summary>
  public class ApplicationLog
  {
   /// <summary>
   /// 將錯誤資訊紀錄到Win2000/NT事件日誌中
   /// <param name="message">需要紀錄的文件資訊</param>
   /// </summary>
   public static void WriteError(String message)
   {
    WriteLog(TraceLevel.Error, message);
   }
   /// <summary>
   /// 將警告資訊紀錄到Win2000/NT事件日誌中
   /// <param name="message">需要紀錄的文件資訊</param>
   /// </summary>

   public static void WriteWarning(String message)
   {
    WriteLog(TraceLevel.Warning, message);  
   }
   /// <summary>
   /// 將提示資訊紀錄到Win2000/NT事件日誌中
   /// <param name="message">需要紀錄的文件資訊</param>
   /// </summary>
   public static void WriteInfo(String message)
   {
    WriteLog(TraceLevel.Info, message);
   }
   /// <summary>
   /// 將Trace資訊紀錄到Win2000/NT事件日誌中
   /// <param name="message">需要紀錄的文件資訊</param>
   /// </summary>
   public static void WriteTrace(String message)
   {
    WriteLog(TraceLevel.Verbose, message);
   }

   /// <summary>
   /// 格式化紀錄到事件日誌的文件資訊格式
   /// <param name="ex">需要格式化的Exception物件</param>
   /// <param name="catchInfo">Exception資訊標題字串.</param>
   /// <retvalue>
   /// <para>格式後的Exception資訊字串,包括Exception內容和TraceStack.</para>
   /// </retvalue>
   /// </summary>
   public static String FormatException(Exception ex, String catchInfo)
   {
    StringBuilder strBuilder = new StringBuilder();
    if (catchInfo != String.Empty)
    {
     strBuilder.Append(catchInfo).Append("rn");
    }
    strBuilder.Append(ex.Message).Append("rn").Append(ex.StackTrace);
    return strBuilder.ToString();
   }
   /// <summary>
   /// 實際事件日誌寫入方法
   /// <param name="level">要紀錄資訊的級別(error,warning,info,trace).</param>
   /// <param name="messageText">要紀錄的文件.</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Exception
  }
 } //class ApplicationLog
}



12.Panel 橫向捲軸,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>
onkeydown="if(event.keyCode==13) event.keyCode=9"

14.DataGrid超級連接列


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.範本列
<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>
  
Code Behind File程式碼


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.數位格式化
  【<%#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");



18.日期格式化
  【aspx頁面內:<%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date")%>
  顯示為: 2004-8-11 19:44:28
  我只想要:2004-8-11 】
<%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date","{0:yyyy-M-d}")%>
  應該如何改?
  【格式化日期】
  取出來,一般是object((DateTime)objectFromDB).ToString("yyyy-MM-dd");

  【日期的驗證運算式】
  A.以下正確的輸入格式: [2004-2-29], [2004-02-29 10:29:39 pm], [2004/12/31]
^((d{2}(([02468][048])|([13579][26]))[-/s]?((((0?[13578])|(1[02]))[-/s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[-/s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[-/s]?((0?[1-9])|([1-2][0-9])))))|(d{2}(([02468][1235679])|([13579][01345789]))[-/s]?((((0?[13578])|(1[02]))[-/s]?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[-/s]?((0?[1-9])|([1-2][0-9])|(30)))|(0?2[-/s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))(s(((0?[1-9])|(1[0-2])):([0-5][0-9])((s)|(:([0-5][0-9])s))([AM|PM|am|pm]{2,2})))?$

  B.以下正確的輸入格式:[0001-12-31], [9999 09 30], [2002/03/03]
^d{4}[-/s]?((((0[13578])|(1[02]))[-/s]?(([0-2][0-9])|(3[01])))|(((0[469])|(11))[-/s]?(([0-2][0-9])|(30)))|(02[-/s]?[0-2][0-9]))$
  【大小寫轉換】
HttpUtility.HtmlEncode(string);
HttpUtility.HtmlDecode(string)

19.如何設定全域變數
  Global.asax中
  Application_Start()事件中
  添加Application[屬性名] = xxx;
  就是你的全域變數

20.怎樣作到HyperLinkColumn生成的連接後,點擊連接,打開新視窗?
  HyperLinkColumn有個屬性Target,將值設置成"_blank"即可.(Target="_blank")
  【ASPNETMENU】點擊功能表項彈出新視窗
  在你的menuData.xml檔的菜單項中加入URLTarget="_blank",如:
<?xml version="1.0" encoding="GB2312"?>
<MenuData ImagesBaseURL="images/">
<MenuGroup>
<MenuItem Label="內參信息" URL="Infomation.aspx" >
<MenuGroup ID="BBC">
<MenuItem Label="公告資訊" URL="Infomation.aspx" URLTarget="_blank" LeftIcon="file.gif"/>
<MenuItem Label="編制資訊簡報" URL="NewInfo.aspx" LeftIcon="file.gif" />

......



21.讀取DataGrid控制項TextBox值


foreach(DataGrid dgi in yourDataGrid.Items)
{
 TextBox tb = (TextBox)dgi.FindControl("yourTextBoxId");
 tb.Text....
}




23.在DataGrid中有3個範本列包含Textbox分別為 DG_ShuLiang (數量) DG_DanJian(單價) DG_JinE(金額)分別在5.6.7列,要求在錄入數量及單價的時候自動算出金額即:數量*單價=金額還要求錄入時限制為數值型.我如何用用戶端Script實現這個功能?
  ?思歸?

<asp:TemplateColumn HeaderText="數量">
<ItemTemplate>
<asp:TextBox id="ShuLiang" runat=’server’ Text=’<%# DataBinder.Eval(Container.DataItem,"DG_ShuLiang")%>’
onkeyup="javascript:DoCal()"
/>
<asp:RegularExpressionValidator id="revS" runat="server" ControlToValidate="ShuLiang" ErrorMessage="must be integer" ValidationExpression="^d+$" />
</ItemTemplate>
</asp:TemplateColumn>

<asp:TemplateColumn HeaderText="單價">
<ItemTemplate>
<asp:TextBox id="DanJian" runat=’server’ Text=’<%# DataBinder.Eval(Container.DataItem,"DG_DanJian")%>’
onkeyup="javascript:DoCal()"
/>
<asp:RegularExpressionValidator id="revS2" runat="server" ControlToValidate="DanJian" ErrorMessage="must be numeric" ValidationExpression="^d+(.d*)?$" />
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="金額">
<ItemTemplate>
<asp:TextBox id="JinE" runat=’server’ Text=’<%# DataBinder.Eval(Container.DataItem,"DG_JinE")%>’ />
</ItemTemplate>
</asp:TemplateColumn><script language="javascript">
function DoCal()
{
 var e = event.srcElement;
 var row = e.parentNode.parentNode;
 var txts = row.all.tags("INPUT");
 if (!txts.length || txts.length < 3)
  return;
 var q = txts[txts.length-3].value;
 var p = txts[txts.length-2].value;
 if (isNaN(q) || isNaN(p))
  return;
 q = parseInt(q);
 p = parseFloat(p);
 txts[txts.length-1].value = (q * p).toFixed(2);
}
</script>

24.datagrid選定比較底下的行時,為什麼總是刷新一下,然後就捲軸到了最上面,剛才選定的行因螢幕的關係就看不到了。
page_load
page.smartNavigation=true
  
25.在Datagrid中修改資料,當點擊編輯鍵時,資料出現在TextBox中,怎麼控制TextBox的大小 ?


private void DataGrid1_ItemDataBound(obj sender,DataGridItemEventArgs e)
{
 for(int i=0;i<e.Item.Cells.Count-1;i++)
  if(e.Item.ItemType==ListItemType.EditType)
  {
   e.Item.Cells[i].Attributes.Add("Width", "80px")
  }
}



26.對話方塊


private static string ScriptBegin = "<script language="JavaScript">";
private static string ScriptEnd = "</script>";
public static void ConfirmMessageBox(string PageTarget,string Content)
{
 string ConfirmContent="var retValue=window.confirm(’"+Content+"’);"+"if(retValue){window.location=’"+PageTarget+"’;}";
 ConfirmContent=ScriptBegin + ConfirmContent + ScriptEnd;
 Page ParameterPage = (Page)System.Web.HttpContext.Current.Handler;
 ParameterPage.RegisterStartupScript("confirm",ConfirmContent);
 //Response.Write(strScript);
}


27. 將時間格式化:


string aa=DateTime.Now.ToString("yyyy年MM月dd日");


1.1 取當前年月日時分秒


currentTime=System.DateTime.Now;


1.2 取當前年
i


nt 年= DateTime.Now.Year;


1.3 取當前月


int 月= DateTime.Now.Month;


1.4 取當前日


int 日= DateTime.Now.Day;


1.5 取當前時


int 時= DateTime.Now.Hour;


1.6 取當前分


int 分= DateTime.Now.Minute;


1.7 取當前秒


int 秒= DateTime.Now.Second;


1.8 取當前毫秒
int 毫秒= DateTime.Now.Millisecond;

28.自定義分頁程式碼:
先定義變數 :


public static int pageCount; //總頁面數
public static int curPageIndex=1; //當前頁面


  
下一頁:


if(DataGrid1.CurrentPageIndex < (DataGrid1.PageCount - 1))
{
 DataGrid1.CurrentPageIndex += 1;
 curPageIndex+=1;
}
bind(); // DataGrid1資料綁定函數


上一頁:


if(DataGrid1.CurrentPageIndex >0)
{
 DataGrid1.CurrentPageIndex += 1;
 curPageIndex-=1;
}

bind(); // DataGrid1資料綁定函數


直接頁面跳轉:


int a=int.Parse(JumpPage.Value.Trim());//JumpPage.Value.Trim()為跳轉值
if(a<DataGrid1.PageCount)
{
 this.DataGrid1.CurrentPageIndex=a;
}
bind();



29.DataGrid使用:
添加刪除確認:


private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
 foreach(DataGridItem di in this.DataGrid1.Items)
 {
  if(di.ItemType==ListItemType.Item||di.ItemType==ListItemType.AlternatingItem)
  {
   ((LinkButton)di.Cells[8].Controls[0]).Attributes.Add("onclick","return confirm(’確認刪除此項嗎?’);");
  }
 }
}



樣式交替:


ListItemType itemType = e.Item.ItemType;
if (itemType == ListItemType.Item )
{

 e.Item.Attributes["onmouseout"]="javascript:this.style.backgroundColor=’#FFFFFF’;";

 e.Item.Attributes["onmouseover"]="javascript:this.style.backgroundColor=’#d9ece1’;cursor=’hand’;" ;

}

else if( itemType == ListItemType.AlternatingItem)
{
 e.Item.Attributes["onmouseout"]="javascript:this.style.backgroundColor=’#a0d7c4’;";
 e.Item.Attributes["onmouseover"]="javascript:this.style.backgroundColor=’#d9ece1’;cursor=’hand’;" ;
}


 
添加一個編號列:


DataTable dt= c.ExecuteRtnTableForAccess(sqltxt); //執行sql返回的DataTable

DataColumn dc=dt.Columns.Add("number",System.Type.GetType("System.String"));
for(int i=0;i<dt.Rows.Count;i++)
{
 dt.Rows[i]["number"]=(i+1).ToString();
}
DataGrid1.DataSource=dt;

DataGrid1.DataBind();


  DataGrid1中添加一個CheckBox,頁面中添加一個全選框


private void CheckBox2_CheckedChanged(object sender, System.EventArgs e)
{
 foreach(DataGridItem thisitem in DataGrid1.Items)
 {
  ((CheckBox)thisitem.Cells[0].Controls[1]).Checked=CheckBox2.Checked;
 }
}


將當前頁面中DataGrid1顯示的資料全部刪除


foreach(DataGridItem thisitem in DataGrid1.Items)
{
 if(((CheckBox)thisitem.Cells[0].Controls[1]).Checked)
 {
  string strloginid= DataGrid1.DataKeys[thisitem.ItemIndex].ToString();
  Del (strloginid); //刪除函數
 }
}



30.當然在不同目錄下,需要獲取資料庫連接字串(如果連接字串放在Web.config,然後在Global.asax中初始化)
在Application_Start中添加以下程式碼:


Application["ConnStr"]=this.Context.Request.PhysicalApplicationPath+ConfigurationSettings.
   AppSettings["ConnStr"].ToString();



31. 變數.ToString()
字元型轉換 轉為字串


12345.ToString("n"); //生成 12,345.00

12345.ToString("C"); //生成 ¥12,345.00

12345.ToString("e"); //生成 1.234500e+004
12345.ToString("f4"); //生成 12345.0000
12345.ToString("x"); //生成 3039 (16進制)
12345.ToString("p"); //生成 1,234,500.00%  



32、變數.Substring(參數1,參數2);
截取字串的一部分,參數1為左起始位數,參數2為截取幾位。 如:string s1 = str.Substring(0,2);
33.在自己的網站上登錄其他網站:(如果你的頁面是通過內嵌方式的話,因為一個頁面只能有一個FORM,這時可以導向另外一個頁面再送出登錄資訊)
<SCRIPT language="javascript">
<!--
 function gook(pws)
 {
  frm.submit();
 }
//-->
</SCRIPT> <body leftMargin="0" topMargin="0" onload="javascript:gook()" marginwidth="0" marginheight="0">
<form name="frm" action=" http://220.194.55.68:6080/login.php?retid=7259 " method="post">
<tr>
<td>
<input id="f_user" type="hidden" size="1" name="f_user" runat="server">
<input id="f_domain" type="hidden" size="1" name="f_domain" runat="server">
<input class="box" id="f_pass" type="hidden" size="1" name="pwshow" runat="server">
<INPUT id="lng" type="hidden" maxLength="20" size="1" value="5" name="lng">
<INPUT id="tem" type="hidden" size="1" value="2" name="tem">
</td>
</tr>
</form>
  TextBox的名稱必須是你要登錄的網頁上的名稱,如果程式碼不行可以用vsniffer 看看。
  下面是獲取用戶輸入的登錄資訊的程式碼:


string name;
name=Request.QueryString["EmailName"];
try
{
 int a=name.IndexOf("@",0,name.Length);
 f_user.Value=name.Substring(0,a);
 f_domain.Value=name.Substring(a+1,name.Length-(a+1));
 f_pass.Value=Request.QueryString["Psw"];
}
catch
{
 Script.Alert("錯誤的郵件!");
 Server.Transfer("index.aspx");
}



最好將你的aspnetmenu升級到1.2版