MSChart實例

MSChart是VS中自帶的圖表控件，功能比較強大，效果也比較豐富。下面只提供一個例子，以供新接觸的朋友參考。

先看下效果圖：

看完效果圖上代碼啦。

使用這個控件需要先在頁面注冊一下。

<%@ 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工具箱中直接拖動的，上述注冊控件的代碼是可以自動生成的。

<div>  
    <asp:DropDownList ID="ddlSelectType" runat="server" AutoPostBack="true">  
        <asp:ListItem Text="柱狀圖" Value="Column" />  
        <asp:ListItem Text="餅圖" Value="Pie" />  
        <asp:ListItem Text="折線圖" 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>  

上面在控件內部設置了很多屬性，用於控制圖表顯示的效果。

protected void Page_Load(object sender, EventArgs e)  
{  
    if (!IsPostBack)  
    {  
        ChartBind(SeriesChartType.Line);  
    }  
    ddlSelectType.SelectedIndexChanged += new EventHandler(ddlSelectType_SelectedIndexChanged);  
}  
  
/// <summary>  
/// 准備數據源  
/// </summary>  
/// <returns>數據源</returns>  
public DataTable PrepareData()  
{  
    DataTable dt = new DataTable();  
    dt.Columns.Add("subject", typeof(string));  
    dt.Columns.Add("score", typeof(float));  
    dt.Rows.Add("數學", 80);  
    dt.Rows.Add("語文", 89);  
    dt.Rows.Add("英語", 97);  
    dt.Rows.Add("物理", 78);  
    dt.Rows.Add("化學", 76);  
    return dt;  
}  
  
/// <summary>  
/// 圖表綁定  
/// </summary>  
/// <param name="chartType">圖表類型</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;//圖表類型  
    Chart1.DataBind();  
}  
  
/// <summary>  
/// 下拉框選擇  
/// </summary>  
protected void ddlSelectType_SelectedIndexChanged(object sender, EventArgs e)  
{  
    SeriesChartType chartType;  
    string value = this.ddlSelectType.SelectedValue;  
    switch (value)  
    {  
        case "Column": chartType = SeriesChartType.Column; break;//柱狀圖  
        case "Pie": chartType = SeriesChartType.Pie; break;//餅圖  
        case "Line": chartType = SeriesChartType.Line; break;//折線圖  
        default: chartType = SeriesChartType.Column; break;  
    }  
    ChartBind(chartType);  
} 

值得一提的是，只要指定了圖表類別，綁定的代碼共用一套，即可顯示不同的圖表效果。