如何在ASP图表控件中的图表中显示错误消息 [英] How to display Error message into chart in asp chart controls

问题描述

我有一个图表，当rows.count == 0时，我必须将消息显示为无数据" 其他是条形图.

I have a chart where I have to display message as "No Data Present",when rows.count == 0 else the bar chart as usually.

我可以知道如何显示该消息吗?

May i know how to display that message.

谢谢.

推荐答案

尝试一下:

protected void ChartExample_DataBound(object sender, EventArgs e)
{
    // If there is no data in the series, show a text annotation
    if(ChartExample.Series[0].Points.Count == 0)
    {
        System.Web.UI.DataVisualization.Charting.TextAnnotation annotation = 
            new System.Web.UI.DataVisualization.Charting.TextAnnotation();
        annotation.Text = "No data for this period";
        annotation.X = 5;
        annotation.Y = 5;
        annotation.Font = new System.Drawing.Font("Arial", 12);
        annotation.ForeColor = System.Drawing.Color.Red;
        ChartExample.Annotations.Add(annotation);
    }
}

谢谢

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