• ASP.NET程序中常用的三十三种代码


    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"+"\"");
     }
    }

      
    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 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))([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)

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  • 原文地址:https://www.cnblogs.com/wubin264/p/1275041.html
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