Question

我在数据源中有值，数据源没有问题。我必须将X和Y值分配给图表。图表抛出一个错误，并说没有名为“TotalInboundArrivals”的列。

ChartControl chart = new ChartControl();
chart.Location = new Point(38, 301);
chart.Size = new Size(789, 168);
Series series = new Series("Series1", ViewType.Bar);
chart.Series.Add(series);
series.DataSource = ds;
series.ArgumentScaleType = ScaleType.Numerical;
series.ArgumentDataMember = "TotalInboundArrivals"; //throws error here
series.ValueScaleType = ScaleType.Numerical;
series.ValueDataMembers.AddRange(new string[] { "StartTime" }); //throws error here 

((SideBySideBarSeriesView)series.View).ColorEach = true;
((XYDiagram)chart.Diagram).AxisY.Visible = true;
chart.Legend.Visible = true;
chart.Visible = true;
chart.Dock = DockStyle.Fill;
xtraTabPage1.Controls.Add(chart);

我的问题在哪里？有什么建议吗？

Answer 1

你经历过Series.DataSource Property。您错误地将DataSet作为DataSource分配给系列。想想看，它如何搜索数据源中的列。尝试将Ds.Tables["TableName"]指定为数据源。

创建数据源表

private DataTable CreateChartData(int rowCount) {
            // Create an empty table.
            DataTable table = new DataTable("Table1");

            // Add two columns to the table.
            table.Columns.Add("Argument", typeof(Int32));
            table.Columns.Add("Value", typeof(Int32));

            // Add data rows to the table.
            Random rnd = new Random();
            DataRow row = null;
            for (int i = 0; i < rowCount; i++) {
                row = table.NewRow();
                row["Argument"] = i;
                row["Value"] = rnd.Next(100);
                table.Rows.Add(row);
            }

指定与数据源

对应的系列属性

Series series = new Series("Series1", ViewType.Bar);
            chart.Series.Add(series);

            // Generate a data table and bind the series to it.
            series.DataSource = CreateChartData(50);

            // Specify data members to bind the series.
            series.ArgumentScaleType = ScaleType.Numerical;
            series.ArgumentDataMember = "Argument";
            series.ValueScaleType = ScaleType.Numerical;
            series.ValueDataMembers.AddRange(new string[] { "Value" });

检查Examples并浏览创建Charts -> Providing Data部分，以便更好地理解它。

Reference

希望这有帮助。

Devexpress xtraChart如何分配x和y值？

1 个答案: