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ASP.NET常用代码

 

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" 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_ItemDataBound

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[“列名”].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 :)

}

  Redirect会导致postback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"+"\"");

 }

}

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="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

  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 ], [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

  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

21.读取DataGrid控件TextBox

 

foreach(DataGrid dgi in yourDataGrid.Items)

{

 TextBox tb = (TextBox)dgi.FindControl("yourTextBoxId");

 tb.Text....

}

  23.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*单价=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.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")

  }

}

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("yyyyMMdd");

  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();

29DataGrid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.Item||di.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=" 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>

  文本框的名称必须是你要登陆的网页上的名称,如果源码不行可以用vsniffer 看看。

  下面是获取用户输入的登陆信息的代码:

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("错误的邮箱!");

 Server.Transfer("index.aspx");

}

posted on 2005-11-17 23:10  antony.net  阅读(250)  评论(0编辑  收藏  举报