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，用于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>
/// 準備數據源
/// </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。