App_Code/MsgBox.cs

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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;

/// <summary>
/// MsgBox 的摘要说明
/// </summary>
public class MsgBox
{
    //需要这个的就自己引用System.Web.Extensions.dll
    #region Ajax用的警告框
    //public static void Alert(string _Msg, UpdatePanel UP_Name)
    //{

    //    System.Web.UI.ScriptManager.RegisterClientScriptBlock(UP_Name, typeof(UpdatePanel), "AjaxMsgBox", "alert('" + _Msg + "');", true);
    //}
    #endregion

    #region 警告框
    /// <summary>
    /// 警告框
    /// </summary>
    /// <param name="_Msg">警告字串</param>
    /// <returns>警告框JS</returns>
    public static void Alert(string _Msg)
    {
        string StrScript;
        StrScript = ("<script language=javascript>");
        StrScript += ("alert('" + _Msg + "');");
        StrScript += ("</script>");
        System.Web.HttpContext.Current.Response.Write(StrScript);
    }
    /// <summary>
    /// 警告框
    /// </summary>
    /// <param name="_Msg">警告字串</param>
    /// <param name="_Page">this</param>
    /// <returns>警告框JS</returns>
    public static object Alert(string _Msg, Page _Page)
    {
        string StrScript;
        StrScript = ("<script language=javascript>");
        StrScript += ("alert('" + _Msg + "');");
        StrScript += ("</script>");
        _Page.ClientScript.RegisterStartupScript(_Page.GetType(), "MsgBox", StrScript.ToString());
        return StrScript;
    }
    /// <summary>
    /// 一个含有“确定”，点击以后就转到预设网址的警告框
    /// </summary>
    /// <param name="_Msg">警告字串</param>
    /// <param name="URL">“确定”以后要转到预设网址</param>
    /// <returns>警告框JS</returns>
    public static void Alert(string _Msg, string URL)