C# 圖表與 SQLite 數據

Question

有很多與 C# 圖表相關的問題與 SQL 數據，但我沒有發現 SQLite 數據。

以前，我設法使它與 SQL 數據一起工作，但現在我被 SQLite 困住了。

以下是一些鏈接到組合框的變量，它們有效。 我還創建了幾個文本框來查看它們輸出的值和它們的工作原理。

SQLiteConnection con = new SQLiteConnection(DataAccess.ConString("Default"));
IDbConnection cn = new SQLiteConnection(DataAccess.ConString("Default"));
string eID = "";
string pID = "";
string baseQuery = "SELECT [Date], [Full_Name], [Exercise_Name], [Total_Sets], [Total_Reps], [Average_Reps], [Average_Weight] FROM [Daily Progress] dp, [Person] p, [Exercise Details] ed " +
         "WHERE  (dp.[Exercise_ID] = ed.[Exercise_ID] AND dp.[Person_ID] = p.[Person_ID]) ";
string eFilter = " AND ed.[Exercise_ID] = ";
string pFilter = " AND p.[Person ID] = ";
string dateOrder = " ORDER BY [Date]";

這是我添加圖表的代碼。

private void loadChart()
        {
            try
            {
                chart1.Titles.Clear();
                chart1.Series.Clear();

                SQLiteCommand cmd = new SQLiteCommand(baseQuery + eFilter + eID + pFilter + pID + dateOrder, con);
                con.Open();
                SQLiteDataReader dr = cmd.ExecuteReader();
                DataTable dt = new DataTable();

                dt.Load(dr);
                chart1.DataBind();
                con.Close();

                chart1.DataSource = dt;              


                cb_Total_Days.DataSource = dt;
                cb_Total_Days.DisplayMember = "Workout_Days";


                chart1.Titles.Add(cb_Workout_Name.SelectedText.ToString());
                chart1.Titles.Add(cb_Person_Name.SelectedText.ToString());
                                
                chart1.Series.Add("Total Sets");
                chart1.Series["Total Sets"].XValueMember = "Date";
                chart1.Series["Total Sets"].YValueMembers = "Total_Sets";
                chart1.Series["Total Sets"].ChartType = SeriesChartType.Column;
                chart1.Series["Total Sets"]["PixelPointWidth"] = "20";
                chart1.Series["Total Sets"].IsValueShownAsLabel = true;
                chart1.Series["Total Sets"].LabelBorderWidth = 3;
                chart1.Series["Total Sets"].SmartLabelStyle.Enabled = true;

                chart1.Series.Add("Average Reps");
                chart1.Series["Average Reps"].XValueMember = "Date";
                chart1.Series["Average Reps"].YValueMembers = "Average_Reps";
                chart1.Series["Average Reps"].ChartType = SeriesChartType.Spline;
                chart1.Series["Average Reps"].BorderWidth = 5;
                chart1.Series["Average Reps"].IsValueShownAsLabel = true;
                chart1.Series["Average Reps"].LabelBorderWidth = 3;
                chart1.Series["Average Reps"].MarkerStyle = MarkerStyle.Cross;
                chart1.Series["Average Reps"].MarkerSize = 15;
                chart1.Series["Average Reps"].SmartLabelStyle.Enabled = true;

                chart1.Series.Add("Average Weight");
                chart1.Series["Average Weight"].XValueMember = "Date";
                chart1.Series["Average Weight"].YValueMembers = "Average_Weight";
                chart1.Series["Average Weight"].ChartType = SeriesChartType.Spline;
                chart1.Series["Average Weight"].BorderWidth = 5;
                chart1.Series["Average Weight"].IsValueShownAsLabel = true;
                chart1.Series["Average Weight"].LabelBorderWidth = 3;
                chart1.Series["Average Weight"].MarkerStyle = MarkerStyle.Star10;
                chart1.Series["Average Weight"].MarkerSize = 15;
                chart1.Series["Average Weight"].SmartLabelStyle.Enabled = true;

                chart1.Series.Add("Total Reps");
                chart1.Series["Total Reps"].XValueMember = "Date";
                chart1.Series["Total Reps"].YValueMembers = "Total_Reps";
                chart1.Series["Total Reps"].ChartType = SeriesChartType.Spline;
                chart1.Series["Total Reps"].BorderWidth = 5;
                chart1.Series["Total Reps"].IsValueShownAsLabel = true;
                chart1.Series["Total Reps"].LabelBorderWidth = 3;
                chart1.Series["Total Reps"].MarkerStyle = MarkerStyle.Diamond;
                chart1.Series["Total Reps"].SmartLabelStyle.Enabled = true;

                chart1.ChartAreas[0].AxisX.LabelStyle.Format = "d-MMM";
                chart1.ChartAreas[0].AxisX.LabelStyle.Angle = -45;
                chart1.ChartAreas[0].AxisX.ScrollBar.Enabled = true;

                chart1.ChartAreas[0].AxisY.MajorGrid.Enabled = false;
                chart1.ChartAreas[0].AxisX.MajorGrid.LineDashStyle = ChartDashStyle.Dot;

                
            }
            catch (Exception) { con.Close(); }
            finally { con.Close(); }
        }

當我運行圖表時，沒有出現錯誤，但圖表只是保持空白，什么也不會出現。

我添加了幾個復選框以實時啟用該系列並開始出現錯誤。 這些是事件處理程序

private void chk_TotalSets_CheckedStateChanged(object sender, EventArgs e)
        {
            Series ts = chart1.Series["Total Sets"];
            ts.Enabled = chk_Total_Sets.Checked;
        }

        private void chk_TotalReps_CheckStateChanged(object sender, EventArgs e)
        {
            Series tr = chart1.Series["Total Reps"];
            tr.Enabled = chk_Total_Reps.Checked;
        }

        private void chk_AvgReps_CheckStateChanged(object sender, EventArgs e)
        {
            Series ar = chart1.Series["Average Reps"];
            ar.Enabled = chk_Avg_Reps.Checked;
        }

        private void chk_AvgWeight_CheckStateChanged(object sender, EventArgs e)
        {
            Series aw = chart1.Series["Average Weight"];
            aw.Enabled = chk_Avg_Weight.Checked;
        }

這是錯誤

System.ArgumentException
  HResult=0x80070057
  Message=A chart element with the name 'Average Reps' could not be found in the 'SeriesCollection'.
  Source=System.Windows.Forms.DataVisualization
  StackTrace:
   at System.Windows.Forms.DataVisualization.Charting.ChartNamedElementCollection`1.get_Item(String name)
   at Workout_Tracker_SQLite.Visualization.chk_AvgReps_CheckStateChanged(Object sender, EventArgs e) in C:\GitHub\Workout-Tracker-SQLite\Forms\Chart_Form.cs:line 188
   at System.Windows.Forms.CheckBox.OnCheckStateChanged(EventArgs e)
   at System.Windows.Forms.CheckBox.set_CheckState(CheckState value)
   at System.Windows.Forms.CheckBox.set_Checked(Boolean value)
   at Workout_Tracker_SQLite.Visualization.btn_LoadChart_Click(Object sender, EventArgs e) in C:\GitHub\Workout-Tracker-SQLite\Forms\Chart_Form.cs:line 203
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(Form mainForm)
   at Workout_Tracker_SQLite.Program.Main() in C:\GitHub\Workout-Tracker-SQLite\Classes\Program.cs:line 21

  This exception was originally thrown at this call stack:
    System.Windows.Forms.DataVisualization.Charting.ChartNamedElementCollection<T>.this[string].get(string)
    Workout_Tracker_SQLite.Visualization.chk_AvgReps_CheckStateChanged(object, System.EventArgs) in Chart_Form.cs
    System.Windows.Forms.CheckBox.OnCheckStateChanged(System.EventArgs)
    System.Windows.Forms.CheckBox.CheckState.set(System.Windows.Forms.CheckState)
    System.Windows.Forms.CheckBox.Checked.set(bool)
    Workout_Tracker_SQLite.Visualization.btn_LoadChart_Click(object, System.EventArgs) in Chart_Form.cs
    System.Windows.Forms.Control.OnClick(System.EventArgs)
    System.Windows.Forms.Button.OnClick(System.EventArgs)
    System.Windows.Forms.Button.OnMouseUp(System.Windows.Forms.MouseEventArgs)
    System.Windows.Forms.Control.WmMouseUp(ref System.Windows.Forms.Message, System.Windows.Forms.MouseButtons, int)
    ...
    [Call Stack Truncated]

Answer 1

我發現 Select 查詢存在語法錯誤。 感謝@TaW 的指導。