MSChart实例

MSChart是VS中自带的图表控件，功能比较强大，效果也比较丰富。下面只提供一个例子，以供新接触的朋友参考。

先看下效果图：

看完效果图上代码啦。

使用这个控件需要先在页面注册一下。

1 2	<%@ Register Assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"     Namespace="System.Web.UI.DataVisualization.Charting" TagPrefix="asp" %>

如果你是在VS工具箱中直接拖动的，上述注册控件的代码是可以自动生成的。

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<div>     <asp:DropDownList ID="ddlSelectType" runat="server" AutoPostBack="true">         <asp:ListItem Text="柱状图" Value="Column" />         <asp:ListItem Text="饼图" Value="Pie" />         <asp:ListItem Text="折线图" Value="Line" />     </asp:DropDownList>     <div>         <asp:Chart ID="Chart1" runat="server" BorderlineDashStyle="Solid" BorderlineColor="Gray"             Width="768px" BackGradientStyle="DiagonalLeft" BackSecondaryColor="AliceBlue"             BackColor="WhiteSmoke">             <Legends>                 <asp:Legend Name="Lgd" BackColor="Transparent" Docking="Top" />             </Legends>             <Series>                 <asp:Series Name="Series1" IsValueShownAsLabel="true" CustomProperties="DrawingStyle=Cylinder, MinPixelPointWidth=20, MaxPixelPointWidth=35, PointWidth=0.3"                     IsXValueIndexed="False" ShadowOffset="1" Legend="Lgd" ChartArea="ChartArea1" />             </Series>             <ChartAreas>                 <asp:ChartArea Name="ChartArea1" BackColor="White" BackSecondaryColor="Azure" BackGradientStyle="DiagonalLeft"                     ShadowOffset="2">                     <AxisY>                         <MajorGrid LineColor="LightSlateGray" LineDashStyle="Dash" />                     </AxisY>                     <AxisX>                         <MajorGrid Enabled="False" />                         <LabelStyle Font="Microsoft Sans Serif, 8pt" />                     </AxisX>                 </asp:ChartArea>             </ChartAreas>         </asp:Chart>     </div> </div>

上面在控件内部设置了很多属性，用于控制图表显示的效果。

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protected void Page_Load(object sender, EventArgs e) {     if (!IsPostBack)     {         ChartBind(SeriesChartType.Line);     }     ddlSelectType.SelectedIndexChanged += new EventHandler(ddlSelectType_SelectedIndexChanged); }            /// <summary> /// 准备数据源 /// </summary> /// <returns>数据源</returns> public DataTable PrepareData() {     DataTable dt = new DataTable();     dt.Columns.Add("subject", typeof(string));     dt.Columns.Add("score", typeof(float));     dt.Rows.Add("数学", 80);     dt.Rows.Add("语文", 89);     dt.Rows.Add("英语", 97);     dt.Rows.Add("物理", 78);     dt.Rows.Add("化学", 76);     return dt; }            /// <summary> /// 图表绑定 /// </summary> /// <param name="chartType">图表类型</param> public void ChartBind(SeriesChartType chartType) {     DataTable dt = PrepareData();     Chart1.Series["Series1"].Points.DataBind(dt.DefaultView, "subject", "score", "LegendText=subject,YValues=score,ToolTip=subject");     Chart1.Series["Series1"].ChartType = chartType;//图表类型     Chart1.DataBind(); }            /// <summary> /// 下拉框选择 /// </summary> protected void ddlSelectType_SelectedIndexChanged(object sender, EventArgs e) {     SeriesChartType chartType;     string value = this.ddlSelectType.SelectedValue;     switch (value)     {         case "Column": chartType = SeriesChartType.Column; break;//柱状图         case "Pie": chartType = SeriesChartType.Pie; break;//饼图         case "Line": chartType = SeriesChartType.Line; break;//折线图         default: chartType = SeriesChartType.Column; break;     }     ChartBind(chartType); }

值得一提的是，只要指定了图表类别，绑定的代码共用一套，即可显示不同的图表效果。

本文转自 guwei4037  51CTO博客，原文链接:http://blog.51cto.com/csharper/1345242