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;
}
}
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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 />
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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" );
}
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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。