Asp.net常用的51个代码(非常实用) [转]

Asp.net常用的51个代码(非常实用)

1.弹出对话框.点击转向指定页面
Code:
Response.Write("<script>window.alert('该会员没有提交申请,请重新提交!')</script>");
Response.Write("<script>window.location ='http://www.msproject.cn/index.asp'</script>");

2.弹出对话框
Code:

Response.Write("<script language='javascript'>alert('产品添加成功!')</script >");


3.删除文件

Code:
string filename ="20059595157517.jpg";
pub.util.DeleteFile(HttpContext.Current.Server.MapPath("../file/")+filename);



4.绑定下拉列表框datalist

Code:
System.Data.DataView dv=conn.Exec_ex("select -1 as code,'请选择经营模式' as content from dealin union select code,content from dealin");
this.dealincode.DataSource=dv;
this.dealincode.DataTextField="content";
this.dealincode.DataValueField="code";   
this.dealincode.DataBind();
this.dealincode.Items.FindByValue(dv[0]["dealincode"].ToString()).Selected=true;


5.时间去秒显示



Code:
<%# System.DateTime.Parse(DataBinder.Eval(Container.DataItem,"begtime").ToString()).ToShortDateString()%>


6.标题带链接



Code:
<%# "<a class=\"12c\" target=\"_blank\" href=\"http://www.51aspx/CV/_"+DataBinder.Eval(Container.DataItem,"procode")+".html\">"+ DataBinder.Eval(Container.DataItem,"proname")+"</a>"%>


7.修改转向



Code:
<%# "<A href=\"editpushpro.aspx?id="+DataBinder.Eval(Container.DataItem,"code")+"\">"+"修改"+"</A>"%>


8.弹出确定按钮



Code:
<%# "<A id=\"btnDelete\" onclick=\"return confirm('你是否确定删除这条记录吗?');\" href=\"pushproduct.aspx?dl="+DataBinder.Eval(Container.DataItem,"code")+"\">"+"删除"+"</A>"%>



9.输出数据格式化 "{0:F2}" 是格式 F2表示小数点后剩两位



Code:
<%# DataBinder.Eval(Container, "DataItem.PriceMoney","{0:F2}") %>


10.提取动态网页内容



Code:
Uri uri = new Uri("http://www.51aspx.com/");
  WebRequest req = WebRequest.Create(uri);
  WebResponse resp = req.GetResponse();
  Stream str = resp.GetResponseStream();
  StreamReader sr = new StreamReader(str,System.Text.Encoding.Default);
  string t = sr.ReadToEnd();
  this.Response.Write(t.ToString());


11.获取" . "后面的字符


Code:
i.ToString().Trim().Substring(i.ToString().Trim().LastIndexOf(".")+1).ToLower().Trim()


12. 打开新的窗口并传送参数:

  传送参数:
Code:
response.write("<script>window.open(’*.aspx?id="+this.DropDownList1.SelectIndex+"&id1="+...+"’)</script>")


接收参数:

Code:
string a = Request.QueryString("id");
string b = Request.QueryString("id1");


12.为按钮添加对话框



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


13.删除表格选定记录


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


14.删除表格记录警告



Code:
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;
  }
}


15.点击表格行链接另一页


Code:
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



Code:
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



Code:
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 + "’)");
}


16.表格超连接列传递参数

Code:
<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")%>’ />



17.表格点击改变颜色



Code:
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



Code:
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=’’;");
}


18.关于日期格式
  日期格式设定
Code:
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"))
Code:
19.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


Code:
// 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
20.清空Cookie



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


21.自定义异常处理



Code:
//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
}


22.Panel 横向滚动,纵向自动扩展

Code:
<asp:panel style="overflow-x:scroll;overflow-y:auto;"></asp:panel>



23.回车转换成Tab
(1)

Code:
<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>



(2) //当在有keydown事件的控件上敲回车时,变为tab



Code:
public void Tab(System.Web .UI.WebControls .WebControl webcontrol)
{
webcontrol.Attributes .Add ("onkeydown", "if(event.keyCode==13) event.keyCode=9");
}


24.DataGrid超级连接列
Code:
DataNavigateUrlField="字段名" DataNavigateUrlFormatString="http://xx/inc/delete.aspx?ID={0}"


25.DataGrid行随鼠标变色



Code:
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"+"\"");
  }
}


26.模板列


Code:
<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" horiz></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



Code:
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;
  }
  }
}


27.数字格式化


Code:
【<%#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");


28.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 】
Code:
<%# 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
Code:
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))([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);
29.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
30.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:


Code:
<?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
31.读取DataGrid控件TextBox值


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


33.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*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?

Code:
<asp:TemplateColumn HeaderText="数量">
<ItemTemplate>
<asp:TextBox id="ShuLiang" runat=’server’ Text=’<%# DataBinder.Eval(Container.DataItem,"DG_ShuLiang")%>’

/>
<asp:RegularExpressionValidator id="revS" runat="server" C ErrorMessage="must be integer" Validati />
</ItemTemplate>
</asp:TemplateColumn>
<asp:TemplateColumn HeaderText="单价">
<ItemTemplate>
<asp:TextBox id="DanJian" runat=’server’ Text=’<%# DataBinder.Eval(Container.DataItem,"DG_DanJian")%>’

/>
<asp:RegularExpressionValidator id="revS2" runat="server" C ErrorMessage="must be numeric" Validati />
</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>


34.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。
Code:
page_load
page.smartNavigation=true

35.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 ?


Code:
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")
  }
}


36.对话框




Code:
private static string ScriptBegin = "<script language=\"JavaScript\">";
private static string ScriptEnd = "</script>";
public static void ConfirmMessageBox(string PageTarget,string Content)
{
  string C+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);
}


37. 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 年= DateTime.Now.Year;
  1.3 取当前月
int 月= DateTime.Now.Month;
  1.4 取当前日
int 日= DateTime.Now.Day;
  1.5 取当前时
int 时= DateTime.Now.Hour;
  1.6 取当前分
int 分= DateTime.Now.Minute;
  1.7 取当前秒
int 秒= DateTime.Now.Second;
  1.8 取当前毫秒
int 毫秒= DateTime.Now.Millisecond;
38.自定义分页代码:
  先定义变量 :


Code:
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();


39.DataGrid使用:
  添加删除确认:

Code:
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:



Code:
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:




Code:
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["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



Code:
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
  }
}


40.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:

Code:
Application["ConnStr"]=this.Context.Request.PhysicalApplicationPath+ConfigurationSettings.
  AppSettings["ConnStr"].ToString();


41. 变量.ToString()
  字符型转换 转为字符串



Code:
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%



42、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);
43.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)

Code:
<SCRIPT language="javascript">
<!--
  function gook(pws)
  {
  frm.submit();
  }
//-->
</SCRIPT> <body leftMargin="0" topMargin="0"  marginwidth="0" marginheight="0">
<form name="frm" action=" http://www.51aspx.com/ " 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:




Code:
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");
}


44.datagrid分页中如果删除时出现超出索引




Code:
public void jumppage(System.Web.UI.WebControls.DataGrid dg)
{
int int_PageLess; //定义页面跳转的页数
//如果当前页是最后一页
if(dg.CurrentPageIndex == dg.PageCount-1)
{
//如果就只有一页
if(dg.CurrentPageIndex == 0)
{
//删除后页面停在当前页
dg.CurrentPageIndex = dg.PageCount-1;
}
else
{
//如果最后一页只有一条记录
if((dg.Items.Count % dg.PageSize == 1) || dg.PageSize == 1)
{
//把最后一页最后一条记录删除后,页面应跳转到前一页
int_PageLess = 2;
}
else //如果最后一页的记录数大于1,那么在最后一页删除记录后仍然停在当前页
{
int_PageLess = 1;
}
dg.CurrentPageIndex = dg.PageCount - int_PageLess;
}
}
}


45.警告窗口

/**//// <summary>
/// 服务器端弹出alert对话框
/// </summary>
/// <param name="str_Message">提示信息,例子:"不能为空!"</param>
/// <param name="page">Page类</param>
Code:
public void Alert(string str_Message,Page page)
{
page.RegisterStartupScript("","<script>alert('"+str_Message+"');</script>");
}

36.重载此警告窗口,使某控件获得焦点


Code:
/**//// <summary>
/// 服务器端弹出alert对话框,并使控件获得焦点
/// </summary>
/// <param name="str_Ctl_Name">获得焦点控件Id值,比如:txt_Name</param>
/// <param name="str_Message">提示信息,例子:"请输入您姓名!"</param>
/// <param name="page">Page类</param>
public void Alert(string str_Ctl_Name,string str_Message,Page page)
{
page.RegisterStartupScript("","<script>alert('"+str_Message+"');document.forms(0)."+str_Ctl_Name+".focus(); document.forms(0)."+str_Ctl_Name+".select();</script>");
}


47.确认对话框


Code:
/**//// <summary>
/// 服务器端弹出confirm对话框
/// </summary>
/// <param name="str_Message">提示信息,例子:"您是否确认删除!"</param>
/// <param name="btn">隐藏Botton按钮Id值,比如:btn_Flow</param>
/// <param name="page">Page类</param>
public void Confirm(string str_Message,string btn,Page page)
{
page.RegisterStartupScript("","<script> if (confirm('"+str_Message+"')==true){document.forms(0)."+btn+".click();}</script>");
}


48.重载确认对话框,点击确定触发一个隐藏按钮事件,点击取消触发一个隐藏按钮事件

Code:
/**//// <summary>
/// 服务器端弹出confirm对话框,询问用户准备转向那些操作,包括“确定”和“取消”时的操作
/// </summary>
/// <param name="str_Message">提示信息,比如:"成功增加数据,单击\"确定\"按钮填写流程,单击\"取消\"修改数据"</param>
/// <param name="btn_Redirect_Flow">"确定"按钮id值</param>
/// <param name="btn_Redirect_Self">"取消"按钮id值</param>
/// <param name="page">Page类</param>
public void Confirm(string str_Message,string btn_Redirect_Flow,string btn_Redirect_Self,Page page)
{
page.RegisterStartupScript("","<script> if (confirm('"+str_Message+"')==true){document.forms(0)."+btn_Redirect_Flow+".click();}else{document.forms(0)."+btn_Redirect_Self+".click();}</script>");
}


49.获得焦点


Code:
/**//// <summary>
/// 使控件获得焦点
/// </summary>
/// <param name="str_Ctl_Name">获得焦点控件Id值,比如:txt_Name</param>
/// <param name="page">Page类</param>
public void GetFocus(string str_Ctl_Name,Page page)
{
page.RegisterStartupScript("","<script>document.forms(0)."+str_Ctl_Name+".focus(); document.forms(0)."+str_Ctl_Name+".select();</script>");
}


50.子窗体返回主窗体


Code:
**////<summary>
///名称:redirect
///功能:子窗体返回主窗体
///参数:url
///返回值:空
///</summary>
public void redirect(string url,Page page)
{
if ( Session["IfDefault"]!=(object)"Default")
{
page.RegisterStartupScript("","<script>window.top.document.location.href='"+url+"';</script>");
}
}



51.判断是否为数字




Code:
/**//// <summary>
/// 名称:IsNumberic
/// 功能:判断输入的是否是数字
/// 参数:string oText:源文本
/// 返回值: bool true:是 false:否
/// </summary>
public bool IsNumberic(string oText)
{
try
{
int var1=Convert.ToInt32 (oText);
return true;
}
catch
{
return false;
}
}


获得字符串实际长度(包括中文字符)




Code:
//获得字符串oString的实际长度
public int StringLength(string oString)
{
byte[] strArray=System.Text .Encoding.Default .GetBytes (oString);
int res=strArray.Length ;
return res;
}
 
posted @ 2009-05-30 11:37  Larify  阅读(276)  评论(0编辑  收藏  举报