ASP.NET中常用的三十三种代码

分类:.Net知识问答| 发布:camnprbubuol| 查看: | 发表时间:2011/4/19

C# code
1. 打开新的窗口并传送参数:
传送参数:
response.write(
"<script>window.open(’*.aspx?id="+this.DropDownList1.SelectIndex+"&id1="+...+"’)</script>")
接收参数:
string a = Request.QueryString("id");
string b = Request.QueryString("id1");
2.为按钮添加对话框
Button1.Attributes.Add(
"onclick","return confirm(’确认?’)");
button.attributes.add(
"onclick","if(confirm(’are you sure...?’)){return true;}else{return false;}")
3.删除表格选定记录
int intEmpID = (int)MyDataGrid.DataKeys[e.Item.ItemIndex];
string deleteCmd = "Delete from Employee where emp_id = " + intEmpID.ToString()
4.删除表格记录警告
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(’您是否确定要删除这条信息’);");
 
break;
default:
 
break;
 }
}
5.点击表格行链接另一页
private void grdCustomer_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
 
//点击表格打开  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 + "’);");
}
双击表格连接到另一页
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 + "");
}
双击表格打开新一页
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.表格超连接列传递参数
<asp:HyperLinkColumn Target
="_blank" headertext="ID号" DataTextField="id" NavigateUrl="aaa.aspx?id=’  <%# DataBinder.Eval(Container.DataItem, "数据字段1")% & name=%# DataBinder.Eval(Container.DataItem, "数据字段2")% /> 7.表格点击改变颜色
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;"); }
写在DataGrid的_ItemDataBound里
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.关于日期格式
日期格式设定
DataFormatString
="{0:yyyy-MM-dd}"
我觉得应该在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.获取错误信息并到指定页面
不要使用Response.Redirect,而应该使用Server.Transfer
e.g
// in global.asax protected void Application_Error(Object sender, EventArgs e) {
if (Server.GetLastError() is HttpUnhandledException)
Server.Transfer(
"MyErrorPage.aspx");
//其余的非HttpUnhandledException异常交给ASP.NET自己处理就okay了 :) }
Redirect会导致post-back的产生从而丢失了错误信息,所以页面导向应该直接在服务器端执行,这样就可以在错误处理页面得到出错信息并进行相应的处理
10.清空Cookie
Cookie.Expires
=[DateTime];
Response.Cookies(
"UserName").Expires = 0
11.自定义异常处理
//自定义异常处理类 using System;
using System.Diagnostics;
namespace MyAppException
{
 
/// <summary>
 
/// 从系统异常类ApplicationException继承的应用程序异常处理类。
 
/// 自动将异常内容记录到Windows NT/2000的应用程序日志
 
/// </summary>  public class AppException:System.ApplicationException
 {
public AppException()
{
 
if (ApplicationConfiguration.EventLogEnabled)LogEvent("出现一个未知错误。");
}
 
public AppException(string message)
 {
LogEvent(message);
 }
 
public AppException(string message,Exception innerException)
 {
LogEvent(message);
if (innerException != null)
{
 LogEvent(innerException.Message);
}
 }
 
//日志记录类  using System;
 
using System.Configuration;
 
using System.Diagnostics;
 
using System.IO;
 
using System.Text;
 
using System.Threading;
 
namespace MyEventLog
 {
/// <summary>
/// 事件日志记录类,提供事件日志记录支持
/// <remarks>
/// 定义了4个日志记录方法 (error, warning, info, trace)
/// </remarks>
/// </summary> public class ApplicationLog
{
 
/// <summary>
 
/// 将错误信息记录到Win2000/NT事件日志中
 
/// <param name="message">需要记录的文本信息</param>
 
/// </summary>  public static void WriteError(String message)
 {
WriteLog(TraceLevel.Error, message);
 }
 
/// <summary>
 
/// 将警告信息记录到Win2000/NT事件日志中
 
/// <param name="message">需要记录的文本信息</param>
 
/// </summary>  public static void WriteWarning(String message)
 {
WriteLog(TraceLevel.Warning, message);
 }
 
/// <summary>
 
/// 将提示信息记录到Win2000/NT事件日志中
 
/// <param name="message">需要记录的文本信息</param>
 
/// </summary>  public static void WriteInfo(String message)
 {
WriteLog(TraceLevel.Info, message);
 }
 
/// <summary>
 
/// 将跟踪信息记录到Win2000/NT事件日志中
 
/// <param name="message">需要记录的文本信息</param>
 
/// </summary>  public static void WriteTrace(String message)
 {
WriteLog(TraceLevel.Verbose, message);
 }
 
/// <summary>
 
/// 格式化记录到事件日志的文本信息格式
 
/// <param name="ex">需要格式化的异常对象</param>
 
/// <param name="catchInfo">异常信息标题字符串.</param>
 
/// <retvalue>
 
/// <para>格式后的异常信息字符串,包括异常内容和跟踪堆栈.</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>
 
/// 实际事件日志写入方法
 
/// <param name="level">要记录信息的级别(error,warning,info,trace).</param>
 
/// <param name="messageText">要记录的文本.</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 );
 
//写入事件日志  eventLog.WriteEntry(messageText, LogEntryType);
}
 
catch {} //忽略任何异常 }
 }
//class ApplicationLog }

12.Panel 横向滚动,纵向自动扩展
<asp:panel style
="overflow-x:scroll;overflow-y:auto;"></asp:panel>
13.回车转换成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超级连接列
DataNavigateUrlField
="字段名" DataNavigateUrlFormatString="http://xx/inc/delete.aspx?ID={0}"
15.DataGrid行随鼠标变色
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"+"\"");
 }
}

 



 




C# code
16.模板列
www.knowsky.com
<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
="选中"
<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>
后台代码
protected void CheckAll_CheckedChanged(object sender, System.EventArgs e)
{
 
//改变列的选定,实现全选或全不选。  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.数字格式化
【<
%#Container.DataItem("price")%>的结果是500.0000,怎样格式化为500.00?
%#Container.DataItem("price","{0:¥#,##0.00}")%
int i=123456;
string s=i.ToString("###,###.00");
18.日期格式化
【aspx页面内:<
%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date")%
显示为:
2004-8-11 19:44:28
我只想要:
2004-8-11
%# DataBinder.Eval(Container.DataItem,"Company_Ureg_Date","{0:yyyy-M-d}")%
应该如何改?
【格式化日期】
取出来,一般是object((DateTime)objectFromDB).ToString(
"yyyy-MM-dd");
【日期的验证表达式】
A.以下正确的输入格式: [
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))([AMPMampm]{2,2})))?$
B.以下正确的输入格式:[
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]))$
【大小写转换】
HttpUtility.HtmlEncode(
string);
HttpUtility.HtmlDecode(
string)
19.如何设定全局变量
Global.asax中
Application_Start()事件中
添加Application[属性名] = xxx;
就是你的全局变量
20.怎样作到HyperLinkColumn生成的连接后,点击连接,打开新窗口?
HyperLinkColumn有个属性Target,将器值设置成
"_blank"即可.(Target="_blank")
【ASPNETMENU】点击菜单项弹出新窗口
在你的menuData.xml文件的菜单项中加入URLTarget
="_blank",如:
?xml version="1.0" encoding="GB2312"?
<MenuData ImagesBaseURL
="images/"
<MenuGroup>
<MenuItem Label
="内参信息" URL="Infomation.aspx"
<MenuGroup ID
="BBC"
<MenuItem Label
="公告信息" URL="Infomation.aspx" URLTarget="_blank" LeftIcon="file.gif"/
<MenuItem Label
="编制信息简报" URL="NewInfo.aspx" LeftIcon="file.gif" /
......
最好将你的aspnetmenu升级到1.2版
21.读取DataGrid控件TextBox值
foreach(DataGrid dgi in yourDataGrid.Items)
{
 TextBox tb
= (TextBox)dgi.FindControl("yourTextBoxId");
 tb.Text....
}
23.在DataGrid中有3个模板列包含Textbox分别为 DG_ShuLiang (数量) DG_DanJian(单价) DG_JinE(金额)分别在5.6.7列,要求在录入数量及单价的时候自动算出金额即:数量*

=金额还要求录入时限制为数值型.我如何用客户端脚本实现这个功能?

<asp:TemplateColumn HeaderText
="数量"
<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+$" /
/ItemTemplate>
/asp:TemplateColumn>
<asp:TemplateColumn HeaderText
="单价"
<ItemTemplate>
<asp:TextBox id
="DanJian" runat=server Text=<%# DataBinder.Eval(Container.DataItem,"DG_DanJian")%>
onkeyup
="javascript:DoCal()"
/
<asp:RegularExpressionValidator id
="revS2" runat="server" ControlToValidate="DanJian" ErrorMessage="must be numeric" ValidationExpression="^\d+(\.\d*)?$" /


/ItemTemplate>
/asp:TemplateColumn>
<asp:TemplateColumn HeaderText
="金额"
<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选定比较底下的行时,为什么总是刷新一下,然后就滚动到了最上面,刚才选定的行因屏幕的关系就看不到了。
page_load
page.smartNavigation
=true
25.在Datagrid中修改数据,当点击编辑键时,数据出现在文本框中,怎么控制文本框的大小 ?
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")
}
}


 



 



C# code
26.对话框
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); }
 
27. 将时间格式化:string aa=DateTime.Now.ToString("yyyy年MM月dd日");
1.1 取当前年月日时分秒
currentTime
=System.DateTime.Now;
1.2 取当前年
int= DateTime.Now.Year;
1.3 取当前月
int= DateTime.Now.Month;
1.4 取当前日
int= DateTime.Now.Day;
1.5 取当前时
int= DateTime.Now.Hour;
1.6 取当前分
int= DateTime.Now.Minute;
1.7 取当前秒
int= DateTime.Now.Second;
1.8 取当前毫秒
int 毫秒= DateTime.Now.Millisecond;
28.自定义分页代码:
先定义变量 :
public static int pageCount; //总页面数 public static int curPageIndex=1; //当前页面 下一页:
if(DataGrid1.CurrentPageIndex < (DataGrid1.PageCount - 1))
{
 DataGrid1.CurrentPageIndex
+= 1;
 curPageIndex
+=1;
}
bind();
// DataGrid1数据绑定函数 上一页:
if(DataGrid1.CurrentPageIndex >0)
{
 DataGrid1.CurrentPageIndex
+= 1;
 curPageIndex
-=1;
}
bind();
// DataGrid1数据绑定函数 直接页面跳转:
int a=int.Parse(JumpPage.Value.Trim());//JumpPage.Value.Trim()为跳转值 if(a<DataGrid1.PageCount)
{
 
this.DataGrid1.CurrentPageIndex=a;
}
bind();
29.DataGrid使用:
添加删除确认:
private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
 
foreach(DataGridItem di in this.DataGrid1.Items)
 {
if(di.ItemType==ListItemType.Itemdi.ItemType==ListItemType.AlternatingItem)
{
 ((LinkButton)di.Cells[
8].Controls[0]).Attributes.Add("onclick","return confirm(’确认删除此项吗?’);");
}
 }
}
样式交替:
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’;" ;
}
添加一个编号列:
DataTable dt
= c.ExecuteRtnTableForAccess(sqltxt); //执行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中添加一个CheckBox,页面中添加一个全选框
private void CheckBox2_CheckedChanged(object sender, System.EventArgs e)
{
 
foreach(DataGridItem thisitem in DataGrid1.Items)
 {
((CheckBox)thisitem.Cells[
0].Controls[1]).Checked=CheckBox2.Checked;
 }
}
将当前页面中DataGrid1显示的数据全部删除
foreach(DataGridItem thisitem in DataGrid1.Items)
{
 
if(((CheckBox)thisitem.Cells[0].Controls[1]).Checked)
 {
string strloginid= DataGrid1.DataKeys[thisitem.ItemIndex].ToString();
Del (strloginid);
//删除函数  }
}
30.当文件在不同目录下,需要获取数据库连接字符串(如果连接字符串放在Web.config,然后在Global.asax中初始化)
在Application_Start中添加以下代码:
Application[
"ConnStr"]=this.Context.Request.PhysicalApplicationPath+ConfigurationSettings.
 AppSettings[
"ConnStr"].ToString();
31. 变量.ToString()
字符型转换 转为字符串
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进制) 12345.ToString("p"); //生成 1,234,500.00% 32、变量.Substring(参数1,参数2);
截取字串的一部分,参数1为左起始位数,参数2为截取几位。 如:
string s1 = str.Substring(0,2);
33.在自己的网站上登陆其他网站:(如果你的页面是通过嵌套方式的话,因为一个页面只能有一个FORM,这时可以导向另外一个页面再提交登陆信息)
<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="document.write('
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