• c#常用函数代码


    1. 打开新的窗口并传送参数:

      传送参数:

    response.write("scriptwindow.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["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 :)

    }

      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 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)

      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?

      〖思归〗

    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;ie.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(aDataGrid1.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;idt.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");

    }

    34 日期类型和字符串类型转换

     /// <summary>
        /// 输入的DateTime转换成本系统自定义字符串格式
        /// </summary>
        /// <param name="dt"></param>
        /// <returns>如果是非法日期,则返回null</returns>
        public static string Date2String(DateTime dt)
        {
            return dt.ToString("yyyyMMdd");
        }

        /// <summary>
        /// 输入的字符串转变成DateTime
        /// </summary>
        /// <param name="strdt"></param>
        /// <returns>如果是空字符串,返回一个缺省的DateTime,客户程序需要对此进行判断</returns>
        public static DateTime String2Date(string strdt)
        {
            if (strdt != null && strdt != "")
            {
                return new DateTime(
                    int.Parse(strdt.Substring(0, 4)),
                    int.Parse(strdt.Substring(4, 2)),
                    int.Parse(strdt.Substring(6, 2)));
            }
            else
            {
                return new DateTime();
            }
        }

    35、C#判断参数数据类型

       /// <summary>
            /// 判断字符串是否为空
            /// </summary>
            /// <param name="str"></param>
            /// <returns></returns>
            public bool IsNull(string str)
            {
                if (str == "" || str == null)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            /// <summary>
            /// 判断是否是数字类型
            /// </summary>
            /// <param name="str">需要判断的字符串</param>
            /// <returns></returns>
            public bool IsInt(string str)
            {
                try
                {               
                    int i = Convert.ToInt32(str);
                    return true;                   
                   
                }
                catch (Exception ex)
                {
                    LogManager.SaveInfo("数据" + str + ":" + ex.ToString());
                    return false;
                }
            }
            /// <summary>
            /// 判断是否是日期类型
            /// </summary>
            /// <param name="str"></param>
            /// <returns></returns>
            public bool IsDate(string str)
            {
                try
                {               
                    DateTime dt = Convert.ToDateTime(str);
                    return true;
                }
                catch (Exception ex)
                {
                    LogManager.SaveInfo("数据" + str + ":" + ex.ToString());
                    return false;
                }
            }

    36、判断字符串长度
            /// <summary>
            /// 判断字符串是否超出长度
            /// </summary>
            /// <param name="str"></param>
            /// <returns></returns>
            public bool IsMaxLength(string str, int len)
            {
                if (str.Length > len)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            /// <summary>
            /// 判断是否最大数值大于最小数值
            /// </summary>
            /// <param name="maxstr">最大值</param>
            /// <param name="minstr">最小值</param>
            /// <returns></returns>
            public bool IsCompareTo(string maxstr, string minstr)
            {
                if (Convert.ToInt32(maxstr) >= Convert.ToInt32(minstr))
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }

    37、把数组里面的空值转换为0或者null

            public void ConvertNullToInt(string[] args)
            {
                for (int i = 0; i < args.Length; i++)
                {
                    if(IsNull(args[i]))
                    {
                        args[i] = "0";
                    }
                }
            }

    38、修改DataSet中的数据行或列的值

            public DataSet AddStrToDataSet(DataSet ds0, string num)
            {
                DataTable dt = new DataTable();
                dt = ds0.Tables[0];
                dt.Columns.Add("totalrows");
                //DataRow dr = dt.NewRow();
                //dr[0] = totalpage;
                //dt.Rows.Add(dr);
                //ds.Tables.Add(dt);
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    dt.Rows[i]["totalrows"] = num;
                }
                dt.AcceptChanges();
                return ds0;
            }

    39、实现ILIST对Datatable、DataSet转换

     /**/
            /// <summary>
            /// Ilist<T> 转换成 DataSet
            /// </summary>
            /// <param name="list"></param>
            /// <returns></returns>
            public static DataSet ConvertToDataSet<T>(IList<T> i_objlist)
            {
                if (i_objlist == null || i_objlist.Count <= 0)
                {
                    return null;
                }

                DataSet ds = new DataSet();
                DataTable dt = new DataTable(typeof(T).Name);
                DataColumn column;
                DataRow row;

                System.Reflection.PropertyInfo[] myPropertyInfo = typeof(T).GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance);

                foreach (T t in i_objlist)
                {
                    if (t == null)
                    {
                        continue;
                    }

                    row = dt.NewRow();

                    for (int i = 0, j = myPropertyInfo.Length; i < j; i++)
                    {
                        System.Reflection.PropertyInfo pi = myPropertyInfo[i];

                        string name = pi.Name;

                        if (dt.Columns[name] == null)
                        {
                            column = new DataColumn(name, pi.PropertyType);
                            dt.Columns.Add(column);
                        }

                        row[name] = pi.GetValue(t, null);
                    }

                    dt.Rows.Add(row);
                }

                ds.Tables.Add(dt);

                return ds;
            }
            /**/
            /// <summary>
            /// Ilist<T> 转换成 DataTable
            /// </summary>
            /// <param name="list"></param>
            /// <returns></returns>
            public static DataTable ConvertToDataTable<T>(IList<T> i_objlist)
            {
                if (i_objlist == null || i_objlist.Count <= 0)
                {
                    return null;
                }
                DataTable dt = new DataTable(typeof(T).Name);
                DataColumn column;
                DataRow row;

                System.Reflection.PropertyInfo[] myPropertyInfo = typeof(T).GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance);

                foreach (T t in i_objlist)
                {
                    if (t == null)
                    {
                        continue;
                    }

                    row = dt.NewRow();

                    for (int i = 0, j = myPropertyInfo.Length; i < j; i++)
                    {
                        System.Reflection.PropertyInfo pi = myPropertyInfo[i];

                        string name = pi.Name;

                        if (dt.Columns[name] == null)
                        {
                            column = new DataColumn(name, pi.PropertyType);
                            dt.Columns.Add(column);
                        }

                        row[name] = pi.GetValue(t, null);
                    }

                    dt.Rows.Add(row);
                }
                return dt;
            }

            /**/
            /// <summary>
            /// Ilist 转换成 DataTable
            /// </summary>
            /// <param name="list"></param>
            /// <returns></returns>
            public static DataTable ConvertToDataTable(IList i_objlist)
            {
                if (i_objlist == null || i_objlist.Count <= 0)
                {
                    return null;
                }
                DataTable dt = new DataTable();
                DataRow row;

                System.Reflection.PropertyInfo[] myPropertyInfo = i_objlist[0].GetType().GetProperties();

                foreach (System.Reflection.PropertyInfo pi in myPropertyInfo)
                {
                    if (pi == null)
                    {
                        continue;
                    }
                    dt.Columns.Add(pi.Name, System.Type.GetType(pi.PropertyType.ToString()));
                }
                for (int j = 0; j < i_objlist.Count; j++)
                {
                    row = dt.NewRow();
                    for (int i = 0; i < myPropertyInfo.Length; i++)
                    {
                        System.Reflection.PropertyInfo pi = myPropertyInfo[i];
                        row[pi.Name] = pi.GetValue(i_objlist[j], null);
                    }
                    dt.Rows.Add(row);
                }
                return dt;
            }

           //
             /**//// <summary> 
            /// 实现对IList到DataSet的转换   我测试稍快一点
            /// </summary> 
            /// <param name="list">待转换的IList</param> 
            /// <returns>转换后的DataSet</returns> 
            public static DataSet ListToDataSet(IList list)  
            {  
                DataSet ds=new DataSet();  
                DataTable dt = new DataTable();  
     
                //此处遍历IList的结构并建立同样的DataTable  
                System.Reflection.PropertyInfo[] p = list[0].GetType().GetProperties();  
                foreach (System.Reflection.PropertyInfo pi in p)  
                {  
                    dt.Columns.Add(pi.Name,System.Type.GetType(pi.PropertyType.ToString()));  
                }  
     
                for (int i = 0; i < list.Count; i++)  
                {  
                    ArrayList TempList = new ArrayList();  
                    //将IList中的一条记录写入ArrayList  
                    foreach (System.Reflection.PropertyInfo pi in p)  
                    {  
                        object oo = pi.GetValue(list[i], null);  
                        TempList.Add(oo);  
                    }  
                      
                    object[] item=new object[p.Length];  
                    //遍历ArrayList向object[]里放数据  
                    for (int j = 0; j < TempList.Count; j++)  
                    {  
                        item.SetValue(TempList[j], j);  
                    }  
                    //将object[]的内容放入DataTable  
                        dt.LoadDataRow(item, true);  
                }  
                //将DateTable放入DataSet  
                ds.Tables.Add(dt);
     
                //返回DataSet  
                return ds;  
            }  

            /**/
            /// <summary>
            /// Ilist 转换成 DataSet
            /// </summary>
            /// <param name="list"></param>
            /// <returns></returns>
            public static DataSet ConvertToDataSet(IList i_objlist)
            {
                if (i_objlist == null || i_objlist.Count <= 0)
                {
                    return null;
                }
                DataSet ds = new DataSet();
                DataTable dt = new DataTable();
                DataRow row;

                System.Reflection.PropertyInfo[] myPropertyInfo = i_objlist[0].GetType().GetProperties();

                foreach (System.Reflection.PropertyInfo pi in myPropertyInfo)
                {
                    if (pi == null)
                    {
                        continue;
                    }
                   // dt.Columns.Add(pi.Name, System.Type.GetType(pi.PropertyType.ToString()));
                    dt.Columns.Add(pi.Name);
                }
                for (int j = 0; j < i_objlist.Count; j++)
                {
                    row = dt.NewRow();
                    for (int i = 0; i < myPropertyInfo.Length; i++)
                    {
                        System.Reflection.PropertyInfo pi = myPropertyInfo[i];
                        row[pi.Name] = pi.GetValue(i_objlist[j], null);
                    }
                    dt.Rows.Add(row);
                }
                ds.Tables.Add(dt);
                return ds;
            }

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  • 原文地址:https://www.cnblogs.com/xiarifeixue/p/1671970.html
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