C#实现仿msn提示消息在登录后只弹出一次的效果

在 codeproject 上看到一个很不错的控件，完全能够自定义弹出窗口的样式、内容、链接，该控件支持Mozilla, Internet Explorer 和 Opera，我试用了一下，效果非常不错，推荐大家使用。

• Download demo project (C# and VB.NET) - 38.1 Kb
• Download control with source - 37.7 Kb
• Download control documentation - 71.1 Kb

• Open online sample [^].

下面主要介绍该控件结合cookie实现登录后只提醒一次的功能！
一、定义变量}

#region members
protected AgronetControl.PopupWin pwVegnet;
private  string downmoontest="downmoontest";
#endregion

二、按钮事件

#region Events
        private void Page_Load(object sender, System.EventArgs e)
        {
            pwVegnet.LinkClicked+=new EventHandler(pwVegnet_LinkClicked);
            this.pwVegnet.Visible=false;
            if(!IsPostBack)
            {
                bool bl=IsShowMessage();
                if(bl)
                {
                    SetMessage();
                    setCookies(downmoontest,"yes",1);
                }
                else
                {
                    this.pwVegnet.Visible=false;
                }
            }
        }
        /// <summary>
        /// 注销按钮
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnLogOff_Click(object sender, System.EventArgs e)
        {
            RemoveAll();
        }
        private void pwVegnet_LinkClicked(object sender, EventArgs e)
        {
            //此处可以加上"下次是否显示之类的脚本"---downmoon 
            Page.Response.Redirect(@"http://www.vegnet.com.cn/user/");
        }

三、主要方法：

#region Methods
private void SetMessage()
{
pwVegnet.HideAfter = 5000 ;
pwVegnet.Visible = true ;
pwVegnet.Title = textTitle.Text;
pwVegnet.Message = textMsg.Text;
pwVegnet.Text = textFull.Text;
pwVegnet.DragDrop = true ;
pwVegnet.OffsetX = 30 ;
pwVegnet.OffsetY = 15 ;
pwVegnet.DockMode = AgronetControl.PopupDocking.BottomRight;
// 随机弹出窗口样式
int t = GetRandomID( 1 , 4 );
switch (t)
{
case 1 : pwVegnet.ColorStyle = AgronetControl.PopupColorStyle.Red; break ;
case 2 : pwVegnet.ColorStyle = AgronetControl.PopupColorStyle.Green; break ;
case 3 : pwVegnet.ColorStyle = AgronetControl.PopupColorStyle.Blue; break ;
case 4 : pwVegnet.ColorStyle = AgronetControl.PopupColorStyle.Violet; break ;
default :pwVegnet.ColorStyle = AgronetControl.PopupColorStyle.Green; break ;
}
pwVegnet.Link = @" http://www.vegnet.com.cn " ;

}

private bool IsShowMessage()
{
string str = getCookies(downmoontest);
if (str == string .Empty || str.ToLower() == " no " )
{
return true ;
}
else
{
return false ;
}

}
public void MsgBox( string strDebug)
{
Page.Response.Write( " <script language=javascript>alert(' " + strDebug.Replace( " ' " , "" ).Replace( " " , "" ) + " ');</script> " );
// Page.Response.End();
}
public static string RandomKey( int b, int e)
{
return DateTime.Now.ToString( " yyyyMMdd-HHmmss-fff- " ) + GetRandomID(b,e);
}

public static int GetRandomID( int minValue, int maxValue)
{
Random ri = new Random( unchecked (( int )DateTime.Now.Ticks));
int k = ri.Next(minValue,maxValue);
return k;
}

#region 读cookie
private void setCookies( string cook, string valuee, int num)
{
// Response.Cookies.Clear();
HttpCookie cookie ;
cookie = Request.Cookies[cook];
if (cookie == null )
{
cookie = new HttpCookie(cook);
cookie.Value = valuee;
cookie.Expires = DateTime.Now.AddDays(num);
HttpContext.Current.Response.Cookies.Add(cookie);
}
else
{
cookie.Value = valuee;
}

}

#endregion
#region 写cookie
private string getCookies( string cook)
{
HttpCookie readcookie = Request.Cookies[cook];
if (readcookie != null && readcookie.Value != null )
{
return readcookie.Value;
}
else
{
return string .Empty;
}
}

#endregion

#region 去除SESSION/注销
/// <summary>
/// 去除SESSION/注销
/// </summary>
public void RemoveAll()
{
HttpCookieCollection cooks = HttpContext.Current.Response.Cookies;
cooks[downmoontest].Expires = new DateTime( 1999 , 10 , 12 );
HttpContext.Current.Response.Cookies.Add(cooks[downmoontest]);
}

#endregion


#endregion

实现效果：

http://www.codeproject.com/KB/custom-controls/asppopup.aspx