• Asp.net常用的51个代码(非常实用) [转]


    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;
    }
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  • 原文地址:https://www.cnblogs.com/binbin695/p/1676684.html
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