ASP.Net開(kāi)發新手常見問題備忘錄

一(yī)位ASP.net初學者學習過程中(zhōng)整理的備忘錄，包括“打開(kāi)新的窗口并傳送參數，爲按鈕添加對話(huà)框，删除表格選定記錄，删除表格記錄警告”等等常見問題的解決方法。
1. 打開(kāi)新的窗口并傳送參數：

　　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.爲按鈕添加對話(huà)框

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

3.删除表格選定記錄

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

4.删除表格記錄警告

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('您是否确定要删除這條信息');");
break;
default:
break;
}
}

5.點擊表格行鏈接另一(yī)頁

private void grdCustomer_ItemDataBound
(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
//點擊表格打開(kāi)
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(yī)頁，在itemDataBind事件中(zhōng)

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(kāi)新一(yī)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 + "')");
}

　　★特别注意：【?id=】 處不能爲 【?id =】

6.表格超連接列傳遞參數

<asp:HyperLinkColumn Target="_blank" headertext="ID号" 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")%>' />

7.表格點擊改變顔色

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.關于日期格式

　　日期格式設定

DataFormatString="{0:yyyy-MM-dd}"

　　我(wǒ)(wǒ)覺得應該在itembound事件中(zhōng)

e.items.cell["你的列"].text=DateTime.Parse(e.items.cell["你的列"].text.ToString("yyyy-MM-dd"))

9.獲取錯誤信息并到指定頁面

　　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會導緻post－back的産生(shēng)從而丢失了錯誤信息，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并進行相應的處理

10.清空Cookie

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

11.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。
/// 自動将異常内容記錄到Windows NT/2000的應用程序日志(zhì)
/// </summary>
public class AppException:System.ApplicationException
{
public AppException()
{
if (ApplicationConfiguration.EventLogEnabled)
LogEvent("出現一(yī)個未知(zhī)錯誤。");
}

public AppException(string message)
{
LogEvent(message);
}

public AppException(string message,Exception innerException)
{
LogEvent(message);
if (innerException != null)
{
LogEvent(innerException.Message);
}
}

//日志(zhì)記錄類
using System;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Threading;

namespace MyEventLog
{
/// <summary>
/// 事件日志(zhì)記錄類，提供事件日志(zhì)記錄支持
/// <remarks>
/// 定義了4個日志(zhì)記錄方法 (error, warning, info, trace)
/// </remarks>
/// </summary>
public class ApplicationLog
{
/// <summary>
/// 将錯誤信息記錄到Win2000/NT事件日志(zhì)中(zhōng)
/// <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>
/// 将警告信息記錄到Win2000/NT事件日志(zhì)中(zhōng)
/// <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>
/// 将提示信息記錄到Win2000/NT事件日志(zhì)中(zhōng)
/// <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>
/// 将跟蹤信息記錄到Win2000/NT事件日志(zhì)中(zhōng)
/// <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志(zhì)的文本信息格式
/// <param name="ex">需要格式化的異常對象</param>
/// <param name="catchInfo">異常信息标題字符串.</param>
/// <retvalue>
/// <para>格式後的異常信息字符串，包括異常内容和跟蹤堆棧.</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>
/// 實際事件日志(zhì)寫入方法
/// <param name="level">要記錄信息的級别（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 );
//寫入事件日志(zhì)
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(chē)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"

http://dotnet.aspx.cc/exam/enter2tab.aspx

14.DataGrid超級連接列

DataNavigateUrlField="字段名" DataNavigateUrlFormatString="http://xx/inc/delete.aspx?ID={0}"


15.DataGrid行随鼠标變色

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.模闆列

<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(zhōng)">
<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，怎樣格式化爲500.00?】
<%#Container.DataItem("price","{0:￥#,##0.00}")%>
int i=123456;
string s=i.ToString("###,###.00");

18.日期格式化

【aspx頁面内：<%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date")%>
顯示爲： 2004-8-11 19:44:28
我(wǒ)(wǒ)隻想要：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(yī)般是object
((DateTime)objectFromDB).ToString("yyyy-MM-dd");

【日期的驗證表達式】
A.以下(xià)正确的輸入格式： [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(xià)正确的輸入格式：[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(dà)小(xiǎo)寫轉換】

HttpUtility.HtmlEncode(string);
HttpUtility.HtmlDecode(string)

19.如何設定全局變量

　　Global.asax中(zhōng)
　　Application_Start()事件中(zhōng)
　　添加Application[屬性名] ＝ xxx;
　　就是你的全局變量

20.怎樣作到HyperLinkColumn生(shēng)成的連接後，點擊連接，打開(kāi)新窗口？

　　HyperLinkColumn有個屬性Target,将器值設置成"_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(zhōng)加入URLTarget="_blank"
　　如：

<?xml version="1.0" encoding="GB2312"?>
<MenuData ImagesBaseURL="images/">
<MenuGroup>
<MenuItem Label="内參信息" 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" />
......

　　最好将你的aspnetmenu升級到1.2版

21.委托讨論

http://community.csdn.net/Expert/topic/2651/2651579.xml?temp=.7183191
http://dev.csdn.net/develop/article/22/22951.shtm

22.讀取DataGrid控件TextBox值

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

23.在DataGrid中(zhōng)有3個模闆列包含Textbox分(fēn)别爲 DG_ShuLiang (數量) DG_DanJian(單價) DG_JinE(金額)分(fēn)别在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(wǒ)(wǒ)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>

<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(xià)的行時，爲什麽總是刷新一(yī)下(xià)，然後就滾動到了最上面，剛才選定的行因屏幕的關系就看不到了

page_load
page.smartNavigation=true

25.在Datagrid中(zhōng)修改數據，當點擊編輯鍵時，數據出現在文本框中(zhōng)，怎麽控制文本框的大(dà)小(xiǎo) ?

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(huà)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=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);

}