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。

<%@ 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。

<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。

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", );
    dt.Rows.Add("语文", );
    dt.Rows.Add("英语", );
    dt.Rows.Add("物理", );
    dt.Rows.Add("化学", );
    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。