我需要在MSChart之类的“ CW21”,“ CW22”等MSChart中格式化时间轴的标签。


有一个LabelStyle.Format属性,但这不支持(AFAIK)日历周。它使用DateTime格式化字符串。有没有办法介绍自定义格式器?
在框架中,我找到了Calendar.GetWeekOfYear方法,该方法可以为我提供正确的星期数。现在的问题是如何将它们整合在一起?


是否有任何好的策略以通用方式在轴上设置自己的标签? (不事先知道轴的最小/最大点)

最佳答案

是的,您可以使用Chart.FormatNumber事件,例如:

private void FillChart()
{
    // register the format event
    this.chart1.FormatNumber += new EventHandler<FormatNumberEventArgs>(chart1_FormatNumber);

    // fill the data table with values
    DataTable dt = new DataTable();
    dt.Columns.Add("X", typeof(DateTime));
    dt.Columns.Add("Y", typeof(double));

    dt.Rows.Add(DateTime.Today.AddDays(1), 10);
    dt.Rows.Add(DateTime.Today.AddDays(8), 30);
    dt.Rows.Add(DateTime.Today.AddDays(15), 10);
    dt.Rows.Add(DateTime.Today.AddDays(21), 20);
    dt.Rows.Add(DateTime.Today.AddDays(25), 40);
    dt.Rows.Add(DateTime.Today.AddDays(31), 25);

    // bind the data table to chart
    this.chart1.Series.Clear();

    var series = this.chart1.Series.Add("Series 1");
    series.XValueMember = "X";
    series.YValueMembers = "Y";

    series.ChartType = SeriesChartType.Line;
    this.chart1.DataSource = dt;
    this.chart1.DataBind();

    // set a custom format to recognize the AxisX label in the event handler
    this.chart1.ChartAreas[0].AxisX.LabelStyle.Format = "CustomAxisXFormat";

}

void chart1_FormatNumber(object sender, FormatNumberEventArgs e)
{
    if (e.ElementType == ChartElementType.AxisLabels &&
        e.Format == "CustomAxisXFormat")
    {
        if (e.ValueType == ChartValueType.DateTime)
        {
            var currentCalendar = CultureInfo.CurrentCulture.Calendar;
            e.LocalizedValue = "CW" +
                currentCalendar.GetWeekOfYear(DateTime.FromOADate(e.Value),
                System.Globalization.CalendarWeekRule.FirstDay,
                CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek);
        }
    }
}




结果如下:

关于c# - MsChart:如何在X轴上将日历周号显示为标签?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/7009113/

10-09 05:28