asp.net的常用程式碼

作者：Eve Cole 更新時間：2009-12-04 16:53:45

0.用session判斷是否登陸

if(Session["login"] == null)
{
Response.Redirect("error.aspx");
}

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.為按鈕新增對話框

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資訊');");
break;
default:
break;
}

}

5.點選表格行連結另一頁

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 + "'");
}
雙擊表格以開啟新一頁
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 + "')");
}
★特別注意：【?id=】處不能為【?id =】

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, "資料欄位1")%>' & name='<%# DataBinder.Eval(Container.DataItem, "資料欄位2")%>' />

7.表格點選改變顏色
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["你的欄位"].text=DateTime.Parse(e.items.cell["你的欄位"].text.ToString("yyyy-MM-dd"))

9.取得錯誤訊息並到指定頁面不要使用Response.Redirect,而應該使用Server.Transfer
eg
// 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的產生因而失去了錯誤訊息，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訊息並進行對應的處理

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>
/// 從系統異常類別ApplicationException繼承的應用程式異常處理類別。
/// 自動將異常內容記錄到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>
/// 將錯誤訊息記錄到Win2000/NT事件日誌中
/// <param name="message">需要記錄的文字資訊</param>
/// </summary>
public static void WriteError(String message)
{

WriteLog(TraceLevel.Error, message);
}

/// <summary>
/// 將警告訊息記錄到Win2000/NT事件日誌中
/// <param name="message">需要記錄的文字資訊</param>
/// </summary>
public static void WriteWarning(String message)
{

WriteLog(TraceLevel.Warning, message);
}

/// <summary>
/// 將提示資訊記錄到Win2000/NT事件日誌中
/// <param name="message">需要記錄的文字資訊</param>
/// </summary>
public static void WriteInfo(String message)
{
WriteLog(TraceLevel.Info, message);
}
/// <summary>
/// 將追蹤資訊記錄到Win2000/NT事件日誌中
/// <param name="message">需要記錄的文字資訊</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字資訊格式
/// <param name="ex">需要格式化的例外物件</param>
/// <param name="catchInfo">異常訊息標題字串.</param>
/// <retvalue>
/// <para>格式後的異常訊息字串，包括異常內容和追蹤堆疊.</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">要記錄資訊的層級（error,warning,info,trace).</param>
/// <param name="messageText">要記錄的文字.</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>

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

14.DataGrid超級連結列
DataNavigateUrlField="字段名" DataNavigateUrlFormatString="}"

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="選取">
<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");

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-Md}")%>

應該如何改？

【格式化日期】
取出,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)

19.如何設定全域變數
Global.asax中

Application_Start()事件中

新增Application[屬性名稱] ＝ xxx;

是你的全域變量

20.怎麼作到HyperLinkColumn產生的連接後，點選連接，開啟新視窗？

HyperLinkColumn有個屬性Target,將器值設定成"_blank"即可.(Target="_blank")

【ASPNETMENU】點選選單項目彈出新視窗在你的menuData.xml檔案的選單項目中加入URLTarget="_blank"
如：
<?xml version="1.0" encoding="GB2312"?>
<MenuData ImagesBaseURL="images/">
<MenuGroup>
<MenuItem Label="內參訊息" 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" />
.....
最好將你的aspnetmenu升級到1.2版

21.委託討論

22.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，要求在輸入數量及單價的時候自動算出金額即:數量*單價=金額也要求輸入時限制為數值型.我如何用客戶端腳本實現這個功能?

〖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>

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，然後就滾動到了最上面，剛才選定的行因屏幕的關係就看不到了
page_load
page.smartNavigation=true

25.在Datagrid中修改數據，當點擊編輯鍵時，數據出現在文字方塊中，怎麼控製文字方塊的大小?

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.Attributes.Add("Width", "80px")

}
}

26.對話框
private static string ScriptBegin = "<script language="JavaScript">";
private static string ScriptEnd = "</script>";

public static void ConfirmMessageBox(string PageTarget,string Content)
{

string ConfirmContent="var retvalue="/blog/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);