Question

我在C＃中创建了一个与捐赠数据相关联的图表。每周，捐赠总额都记录在表格中。图表将这些数字拉出并以折线图形式绘制。

我遇到的问题是，每周都会记录为一周中的某一天，因此基于周工作的控件无法正常工作。我附上了我的代码和下面结果的图片。

我想知道为什么这里的每个数据点都显示为一周中的某一天。我是如何加载数据的？

感谢您提供任何帮助。

这是我的代码：

        #region Chart4
        string DonationSelect = this.DonationSelect.SelectedValue;
        Time = Convert.ToInt32(DonationSelect);

        if (Time > 3)
            Chart4.Series[0].IsValueShownAsLabel = false;
        else
            Chart4.Series[0].IsValueShownAsLabel = true;

        Chart4.Series[0].ChartType = SeriesChartType.Line;
        Chart4.ChartAreas["ChartArea1"].AxisX.IsMarginVisible = true;

        StartDate = GetNextDay(DateTime.Today, DayOfWeek.Sunday);
        TargetDate = GetNextDay(StartDate.AddMonths(-1 * Time), DayOfWeek.Sunday);

        for (DateTime i = TargetDate; i <= DateTime.Now; i = i.AddDays(7))
        {
            int Donations = 0;
            var oDonation = oDatabase.ExecuteScalar(@"SELECT Offering FROM 
            tblStats WHERE Date=@Date",
                "Date", i);

            if (oDonation != null && oDonation != DBNull.Value)
            {
                Donations = Convert.ToInt32(oDonation);
            }
            //int Attendance = Convert.ToInt32();

            string Date = i.ToShortDateString();

            Chart4.Series[0].Points.AddXY(Date, Donations);
        }

        StripLine StripLine = new StripLine();

        StripLine.BackColor = Color.LightGray;
        StripLine.Interval = 1;
        StripLine.IntervalType = DateTimeIntervalType.Weeks;
        StripLine.StripWidth = .5;
        StripLine.StripWidthType = DateTimeIntervalType.Weeks;
        StripLine.IntervalOffset = 0;
        StripLine.IntervalOffsetType = DateTimeIntervalType.Days;

        Chart4.Legends.Add(new Legend("Legend3"));
        Chart4.Series[0].Legend = "Legend3";
        Chart4.Series[0].IsVisibleInLegend = true;
        Chart4.Series[0].LegendText = "Donations";
        Chart4.BorderSkin.SkinStyle = BorderSkinStyle.Emboss;
        Chart4.BackColor = Color.PowderBlue;
        Chart4.Series[0].BorderWidth = 3;
        Chart4.Series[0].BorderColor = Color.Orange;
        Chart4.ChartAreas["ChartArea1"].AxisX.Title = "Date";
        Chart4.ChartAreas["ChartArea1"].BackColor = Color.LightGray;
        Chart4.ChartAreas["ChartArea1"].BackSecondaryColor = Color.White;
        Chart4.ChartAreas["ChartArea1"].BackGradientStyle = GradientStyle.TopBottom;
        Chart4.ChartAreas["ChartArea1"].AxisX.StripLines.Add(StripLine);
        #endregion

Donation Chart

Answer 1

根据http://msdn.microsoft.com/en-us/library/system.globalization.calendar.getweekofyear.aspx，您可以尝试替换这些行：

string Date = i.ToShortDateString();
Chart4.Series[0].Points.AddXY(Date, Donations);

与那些：

  DateTimeFormatInfo dfi = DateTimeFormatInfo.CurrentInfo;
  Calendar cal = dfi.Calendar;
  Chart4.Series[0].Points.AddXY(cal.GetWeekOfYear(i, dfi.CalendarWeekRule, 
                                      dfi.FirstDayOfWeek), Donations);

Answer 2

好的，所以我昨天更多地摆弄了它，这就是问题所在： string Date = i.ToShortDateString（）;

        Chart4.Series[0].Points.AddXY(Date, Donations);

问题在于，为了使日期正常工作，需要将它们作为DateTime变量而不是字符串添加到轴中。因此，任何与周工作的事情都只能以7个字符串为单位计算。正确的代码在这里：

            Chart4.Series[0].Points.AddXY(i, Donations);

感谢您指出我正确的方向！

.Net Chart将日期显示为一周中的天数

2 个答案: