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