我常用的ComFunction类别

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections;
using Microsoft.Practices.EnterpriseLibrary.Data;

/// <summary>
/// ComFunction 的摘要说明

/// 一些通用的方法

/// </summary>
public class ComFunction
{
    public ComFunction()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    #region "返回用户登录名"
    /// <summary>
    /// 返回用户登录名

    /// </summary>
    /// <returns></returns>
    public static string GetUserEnName()
    {
        string strUserEnName = HttpContext.Current.User.Identity.Name;

        strUserEnName = strUserEnName.Substring(strUserEnName.IndexOf('\\') + 1);
        return strUserEnName;

    }
    #endregion

    #region "设置不缓存网页"
    /// <summary>
    /// 设置不缓存网页

    /// </summary>
    public static void SetNoWebCache()
    {
        HttpContext.Current.Response.Cache.SetNoServerCaching();
        HttpContext.Current.Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);
        HttpContext.Current.Response.Cache.SetNoStore();
        HttpContext.Current.Response.Cache.SetExpires(new DateTime(1900, 01, 01, 00, 00, 00, 00));
    }
    #endregion

    #region "在当前页面弹出提示框"
    /// <summary>
    /// 在当前页面弹出提示框
    /// 傅威2006-06-08
    /// </summary>
    /// <param name="page"></param>
    /// <param name="o"></param>
    /// <param name="strText"></param>
    public static void ShowMessageBox(Page page,string strText)
    {
        strText = strText.Replace("'", "").Replace(";", "").Replace("<", "").Replace(">", "").Replace("\\","/").Trim();
        page.ClientScript.RegisterStartupScript(page.GetType(), "", "<script>alert('" + strText + "');</script>");
    }
    #endregion

    #region "在当前页面弹出错误提示信息"
    /// <summary>
    /// 在当前页面弹出提示框
    /// 傅威2006-06-08
    /// </summary>
    /// <param name="page"></param>
    /// <param name="o"></param>
    /// <param name="strText"></param>
    public static void ShowErrorMessage(Page page, string strError)
    {
        strError = strError.Replace("'", "").Replace(";", "").Replace("<", "").Replace(">", "").Replace("\\", "/").Trim();
        page.ClientScript.RegisterStartupScript(page.GetType(), "", "<script>alert('" + "操作失败!错误原因:" + ComFunction.CutString(strError) + "');</script>");
    }
    #endregion

    #region "将ASP.NET 2.0 TextBox设置为只读"
    /// <summary>
    /// 将TextBox设置为只读

    /// 2006-05-22
    /// Written By FuWei
    /// </summary>
    /// <param name="textBox"></param>
    public static void SetTextBoxReadOnly(TextBox textBox)
    {
        textBox.Attributes["readonly"] = "true";
    }
    #endregion

    #region "读取页面参数"
    /// <summary>
    /// 返回页面传送参数

    /// 傅威编写
    /// 2006-08-08
    /// </summary>
    ///<param name="strPara">获取值页面</param>
    /// <param name="strPara">参数名称</param>
    /// <returns>返回值</returns>
    public static string GetParameter(Page page, string strParaName)
    {
        string strVal = "";
        if (page.Request.QueryString[strParaName] != null)
        {
            strVal = page.Request.QueryString[strParaName];
        }
        return strVal;
    }
    #endregion

    #region "检查文件大小"
    public static bool CheckFileLen(FileUpload fileUpLoad)
    {
        if (fileUpLoad.PostedFile.ContentLength / 1024.0 > WebConfigSet.GetMaxFileLen())
        {
            return false;
        }
        else
            return true;
    }
    #endregion

    #region "控件或得焦点"
    public static void setFocus(Control controls, Page page)
    {
        string strScript = String.Format("<script language=JavaScript>document.getElementById('{0}').focus();</script>", controls.ID);
        page.ClientScript.RegisterStartupScript(page.GetType(), "setFocus", strScript);
    }
    #endregion

    #region 剪切字符串

    /// <summary>
    /// 剪切字符传

    /// </summary>
    /// <param name="s">代剪切字符串</param>
    /// <returns>剪切后的字符串</returns>
    public static string CutString(string s)
    {
        if (s.Length < 20)
        {
            return s;
        }
        else
        {
            s = s.Substring(0, 20) + "...";

            return s;
        }
    }

    #endregion
}