ASP.NET显示渐变图片

最终效果:

 

实现效果,首先准备一张图片,高度为25pixel,宽度为1至3pixel渐变的图片。可以这里下载

还要准备数据:

View Code
 Dictionary<intint> Datas
    {
        get
        {
            Dictionary<intint> d = new Dictionary<intint>();
            d.Add(135);
            d.Add(245);
            d.Add(320);
            return d;
        }
    }

 

ok,数据准备完了,在aspx里放三个Label控件,当然你可以显示在其它控件或是标签中,有一点要注意的是Width="300",它是渐变图片在100%的宽度。:

View Code
<asp:Label ID="Label1" runat="server" style="margin: 3px;" Text="" Width="300" BorderWidth="1"></asp:Label><br />
        <asp:Label ID="Label2" runat="server" style="margin: 3px;" Text="" Width="300" BorderWidth="1"></asp:Label><br />
        <asp:Label ID="Label3" runat="server" style="margin: 3px;" Text="" Width="300" BorderWidth="1"></asp:Label><br />

 

把数据显示于Label上: 

View Code
 protected void Page_Load(object sender, EventArgs e)
    {
        Data_Binding();
    }

    private void Data_Binding()
    {
        int totals = 100;
        foreach (KeyValuePair<intint> kvp in Datas)
        {
            double rate = kvp.Value / (double)totals;

            double width = rate * 300;
            switch (kvp.Key)
            {
                case 1:
                    this.Label1.Text = GradientImage(width, rate);
                    break;
                case 2:
                    this.Label2.Text = GradientImage(width, rate);
                    break;
                case 3:
                    this.Label3.Text = GradientImage(width, rate);
                    break;
            }
        }
    }

    private string GradientImage(double width, double rate)
    {
        return "<IMG height='21' src='images/bar.gif' width='" + width + "' align='absMiddle'> " + rate.ToString("p");
    }

 

posted @ 2012-04-01 23:07  Insus.NET  阅读(1440)  评论(3编辑  收藏  举报