App_Code/Common.cs

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using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Text.RegularExpressions;
using System.Net.Mail;


    /// <summary>
    /// 常用ASP.NET函数
    /// </summary>
public class Common
{
    public Common() { }

    /// <summary>
    /// 显示指定长度字符串
    /// </summary>
    /// <returns></returns>
    public static string DisLength(string str, int len)
    {
        if (str.Length > len)
            return str.Substring(0, len) + "...";
        else
            return str;
    }

    /// <summary>
    /// 返回字符串真实长度
    /// </summary>
    /// <param name="str">字符串</param>
    /// <returns>字符串真实长度</returns>
    public static int GetStringLength(string str)
    {
        return Encoding.Default.GetBytes(str).Length;
    }


    /// <summary>
    /// 返回随机上传文件名称
    /// </summary>
    public static string GetRndNumber()
    {
        Random rand = new Random(unchecked((int)DateTime.Now.Ticks));
        return DateTime.Now.ToShortDateString().Replace("-", "") + rand.Next().ToString().Substring(0, 5);
    }

    /// <summary>
    /// 获得当前绝对路径
    /// </summary>
    /// <param name="strPath">路径字符串</param>
    /// <returns>当前绝对路径</returns>
    public static string GetMapPath(string strPath)
    {
        return System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, strPath);
    }

    /// <summary>