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c#常用函数代码

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("<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)

19.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

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版

21.读取DataGrid控件TextBox值



foreach(DataGrid dgi in yourDataGrid.Items)

{

TextBox tb = (TextBox)dgi.FindControl("yourTextBoxId");

tb.Text....

}

23.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?



〖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.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 ?



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[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("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;

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(a<DataGrid1.PageCount)

{

this.DataGrid1.CurrentPageIndex=a;

}



bind();

29.DataGrid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;i<dt.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;
}

posted on 2012-09-16 14:30 ** 阅读(432) 评论(0)  编辑  收藏


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