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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