先给大家来个最终效果:
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:
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Dictionary< int , int> Datas { get { Dictionary< int , int> d = new Dictionary< int , int>(); d.Add(1, 35); d.Add(2, 45); d.Add(3, 20); 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:
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<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:
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protected void Page_Load( object sender, EventArgs e) { Data_Binding(); } private void Data_Binding() { int totals = 100; foreach (KeyValuePair< int , int > 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" ); } |
以上就是ASP.NET实现渐变图片的方法,希望对大家的学习有所帮助。