作代码也有一点时间了，一直在不停的COPY和PASTE，能力涨的有限，深深的研究我也不太会，会用，能用好就行了，但总是做表面功夫，也得有点长进呀，今天没什么事，把平常用的一点代码，改写成一个类库，编译完成后，以后再做代码，直接引用进来，方便。高手不要笑我，低手学习一下吧！
using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web;
using System.Text;
using System.Security.Cryptography;
using System.Drawing;
using System.Collections;
using System.Web.SessionState;
using System.Web.UI.HtmlControls;
namespace PublicFunction
{
public class Public : System.Web.UI.WebControls.WebControl
{
/**////下面是打开数据库和关闭数据库的公用函数
private static string ConnectionString = ConfigurationSettings.AppSettings["sqlconn"];
public static SqlConnection SqlConn =new SqlConnection(ConnectionString);
public static void SqlOpenDataBase()
{
if(SqlConn.State==ConnectionState.Open)
SqlConn.Close();
SqlConn.Open();
}
public static void SqlCloseDataBase()
{
SqlConn.Close();
}
/**////如果有验证所需的密码，而且在其它数据联接中，请打开下面几行
private static string PassConnectionString = ConfigurationSettings.AppSettings["passconn"];
public static SqlConnection PassConn =new SqlConnection(PassConnectionString);
public static void PassOpenDataBase()
{
if(PassConn.State==ConnectionState.Open)
PassConn.Close();
PassConn.Open();
}
public static void PassCloseDataBase()
{
PassConn.Close();
}
/**//* 1、编写： 2004-8-25
* 2、功能：让控件得到焦点
* 3、参数：System.Web.UI.Control control 任意已实例化的控件
* 4、返回值： 无
* 5、用途：使传入该方法的控件得到焦点
*/
public static bool SetFocus(System.Web.UI.Control control)
{
if (HttpContext.Current.Request.Browser.JavaScript)
{
control.Page.RegisterStartupScript("sf","<script language='javascript'>document.forms[0]." +
control.ClientID +".focus();</script>");
return true;
}
return false;
}
/**////用于转换为MD5加密字符串的函数
public static string HashCryptString(string strText,string method)
{
if(method == "MD5")
{
strText = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(strText,"MD5");
}
else if(method == "SHA1")
{
strText = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(strText,"SHA1");
}
else if(method=="BLOG")//这个加密方式取自于.TextBlog的加密函数
{
strText = strText.ToLower();
Byte[] clearBytes = new UnicodeEncoding().GetBytes(strText);
Byte[] hashedBytes = ((HashAlgorithm) CryptoConfig.CreateFromName("MD5")).ComputeHash(clearBytes);
return BitConverter.ToString(hashedBytes);
}
return strText;
}
/**////
/// 输出指定的信息
///
///
///一般引用时MessageBox(this,"我来也！");
public static void MessageBox( Page page, string msg )
{
StringBuilder StrScript = new StringBuilder();
StrScript.Append( "<script language=javascript>" );
StrScript.Append( "alert('"+ msg +"');" );
StrScript.Append( "</script>" );
if ( ! page.IsStartupScriptRegistered( "MessageBox" ) )
{
page.RegisterStartupScript( "MessageBox", StrScript.ToString() );
}
}
/**////
/// 取得随机数
///
/// 随机数的长度
///
public static string GetRandNum( int randNumLength )
{
System.Random randNum = new System.Random( unchecked( ( int ) DateTime.Now.Ticks ) );
StringBuilder sb = new StringBuilder( randNumLength );
for ( int i = 0; i < randNumLength; i++ )
{
sb.Append( randNum.Next( 0, 9 ) );
}
return sb.ToString();
}
/**//// 下面用于记录cookie的使用
///
public static void SaveCookie(string CookieName,string CookieValue,double ExpiresTime)
{
HttpCookie objCookie;
HttpCookieCollection objCookieColl
