【Stimulsoft Reports.WinForms教程】使用自动更新的实时报表预览

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此示例构建具有自动内容更新的实时实时报表。例如，使用带有一些文本的报表和带有两个系列的图表。在Form1初始化方法中，找到必要的报表组件，报表从应用程序资源加载：

private StiText text = null;
private StiChart chart = null;
 
public Form1()
{
    //
    // Required for Windows Form Designer support
    //
    InitializeComponent();
 
    stiReport1.Render();
    StiComponentsCollection comps = stiReport1.RenderedPages[0].GetComponents();
    text = comps["Text1"] as StiText;
    chart = comps["Chart1"] as StiChart;
}

所述timer1_Tick定时器事件改变所选择的报表组件（如角度）的属性，并重绘报表。首先，应用文本轮换：

private System.Windows.Forms.Timer timer1;
 
private void timer1_Tick(object sender, System.EventArgs e)
{
    if (text == null)return;
 
    //Rotate text
    float angle = text.TextOptions.Angle;
    angle -= 1f;
    if (angle < 0)angle = 359;
    text.TextOptions.Angle = angle;
...

接下来，由于图表示例有两个系列，因此应对每个系列进行旋转：

...
    //Rotate series 1
    angle = ((StiDoughnutSeries)chart.Series[0]).StartAngle;
    angle -= 1f;
    if (angle < 0)angle = 359;
    ((StiDoughnutSeries)chart.Series[0]).StartAngle = angle;
 
    //Rotate series 2
    angle = ((StiDoughnutSeries)chart.Series[1]).StartAngle;
    angle += 1f;
    if (angle > 359)angle = 0;
    ((StiDoughnutSeries)chart.Series[1]).StartAngle = angle;
...

最后，实时更新报表：

...
    RectangleD rect = stiPreviewControl1.GetComponentRect(text);
    stiPreviewControl1.InvalidatePageRect(rect.ToRectangle());
 
    rect = stiPreviewControl1.GetComponentRect(chart);
    stiPreviewControl1.InvalidatePageRect(rect.ToRectangle());
    //stiPreviewControl1.View.Invalidate(); 
}

示例代码的结果如下图所示：