ASP.NET常用方法

1.//彈出對話框.點擊轉向指定頁面
Response.Write("<script>window.alert('該會員沒有提交申請,請重新提交!')</script>");
Response.Write("<script>window.location ='http://www.51aspx.com/bizpulic/upmeb.aspx'</script>");
2.//彈出對話框
Response.Write("<script language='javascript'>alert('產品添加成功!')</script >");//頁面會刷新
3.//刪除文件
string filename ="20059595157517.jpg";
pub.util.DeleteFile(HttpContext.Current.Server.MapPath("../file/")+filename);
4.//綁定下拉列表框datalist
System.Data.DataView dv=conn.Exec_ex("select -1 as code,'請選擇經營模式' as content from dealin union select code,content from dealin");
this.dealincode.DataSource=dv;
this.dealincode.DataTextField="content";
this.dealincode.DataValueField="code";    
this.dealincode.DataBind();
this.dealincode.Items.FindByValue(dv[0]["dealincode"].ToString()).Selected=true;
5.//時間去秒顯示
<%# System.DateTime.Parse(DataBinder.Eval(Container.DataItem,"begtime").ToString()).ToShortDateString()%>
6.//標題帶鏈接
<%# "<a class=\"12c\" target=\"_blank\" href=\"http://www.51aspx/CV/_%22+DataBinder.Eval(Container.DataItem,%22procode%22)+%22.html/">"+ DataBinder.Eval(Container.DataItem,"proname")+"</a>"%>//這個網站的首頁新聞處常用
7.//修改轉向
<%# "<A href=\"editpushpro.aspx?id="+DataBinder.Eval(Container.DataItem,"code")+"\">"+"修改"+"</A>"%>
8.//彈出確定按鈕
<%# "<A id=\"btnDelete\" οnclick=\"return confirm('你是否確定刪除這條記錄嗎?');\" href=\"pushproduct.aspx?dl="+DataBinder.Eval(Container.DataItem,"code")+" \">"+"刪除"+"</A>"%>
9.//輸出數據格式化 "{0:F2}" 是格式 F2表示小數點後剩兩位
<%# DataBinder.Eval(Container, "DataItem.PriceMoney","{0:F2}") %>
10.//提取動態網頁內容
Uri uri = new Uri("http://www.51aspx.com/");
  WebRequest req = WebRequest.Create(uri);
  WebResponse resp = req.GetResponse();
  Stream str = resp.GetResponseStream();
  StreamReader sr = new StreamReader(str,System.Text.Encoding.Default);
  string t = sr.ReadToEnd();
  this.Response.Write(t.ToString());
11.//獲取" . "後面的字符
i.ToString().Trim().Substring(i.ToString().Trim().LastIndexOf(".")+1).ToLower().Trim()
12. 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");
12.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;}")
13.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()
14.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;
  }
}
15.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 + "')");
}
16.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")%>' />
17.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='';");
}
18.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"))
19.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 
20.清空Cookie
Cookie.Expires=[DateTime];
Response.Cookies("UserName").Expires = 0
21.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
}
22.Panel 橫向滾動,縱向自動擴展
<asp:panel style="overflow-x:scroll;overflow-y:auto;"></asp:panel>
23.回車轉換成Tab 
(1)
<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>
(2)  //當在有keydown事件的控件上敲回車時,變爲tab
public void Tab(System.Web .UI.WebControls .WebControl webcontrol) 

webcontrol.Attributes .Add ("onkeydown", "if(event.keyCode==13) event.keyCode=9"); 

24.DataGrid超級連接列
DataNavigateUrlField="字段名" DataNavigateUrlFormatString="http://xx/inc/delete.aspx?ID={0}"
25.DataGrid行隨鼠標變色
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"+"\"");
  }
}
26.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" horiz></HEADERSTYLE>
<ITEMTEMPLATE>
<ASP:CHECKBOX id="chkExport" runat="server" />
</ITEMTEMPLATE>
<EDITITEMTEMPLATE>
<ASP:CHECKBOX id="chkExportON" runat="server" enabled="true" />
</EDITITEMTEMPLATE>
</ASP:TEMPLATECOLUMN>
後臺代碼
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;
  }
  }
}
27.數字格式化
【<%#Container.DataItem("price")%>的結果是500.0000,怎樣格式化爲500.00?】
<%#Container.DataItem("price","{0:¥#,##0.00}")%>
int i=123456;
string s=i.ToString("###,###.00");
28.日期格式化
  【aspx頁面內:<%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date")%>
  顯示爲: 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");
  【日期的驗證表達式】
  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)
29.如何設定全局變量
  Global.asax中
  Application_Start()事件中
  添加Application[屬性名] = xxx;
  就是你的全局變量
30.怎樣作到HyperLinkColumn生成的連接後,點擊連接,打開新窗口?
  HyperLinkColumn有個屬性Target,將器值設置成"_blank"即可.(Target="_blank")
  【ASPNETMENU】點擊菜單項彈出新窗口
  在你的menuData.xml文件的菜單項中加入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="公告信息" URL="Infomation.aspx" URLTarget="_blank" LeftIcon="file.gif"/>
<MenuItem Label="編制信息簡報" URL="NewInfo.aspx" LeftIcon="file.gif" />
最好將你的aspnetmenu升級到1.2版
31.讀取DataGrid控件TextBox值
foreach(DataGrid dgi in yourDataGrid.Items)
{
  TextBox tb = (TextBox)dgi.FindControl("yourTextBoxId");
  tb.Text....
}
33. 在DataGrid中有3個模板列包含Textbox分別爲 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爲 數值型.我如何用客戶端腳本實現這個功能?
<asp:TemplateColumn HeaderText="數量"> 
<ItemTemplate>
<asp:TextBox id="ShuLiang" runat='server' Text='<%# DataBinder.Eval(Container.DataItem,"DG_ShuLiang")%>' 
/>
<asp:RegularExpressionValidator id="revS" runat="server" C ErrorMessage="must be integer" Validati />
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="單價"> 
<ItemTemplate>
<asp:TextBox id="DanJian" runat='server' Text='<%# DataBinder.Eval(Container.DataItem,"DG_DanJian")%>' 
/>
<asp:RegularExpressionValidator id="revS2" runat="server" C ErrorMessage="must be numeric" Validati />
</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>
34.datagrid選定比較底下的行時,爲什麼總是刷新一下,然後就滾動到了最上面,剛纔選定的行因屏幕的關係就看不到了。
page_load 
page.smartNavigation=true
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