c# - 如何从数据表c#winform生成折线图

Question

我正在使用 Interop.Excel 从数据表中导出数据并生成折线图。

我可以像这样成功地将数据从数据导出到excel

public static bool Export(System.Data.DataTable dt, string sheetName)
{
    object Missing = System.Reflection.Missing.Value;
    Excel.Application oXL;
    Excel.Workbook oWB;
    Excel.Worksheet oSheet;
    Excel.Range oRange;

    try
    {
        // Start Excel and get Application object. 
        oXL = new Excel.Application();

        // Set some properties 
        oXL.Visible = false;
        oXL.DisplayAlerts = false;

        // Get a new workbook. 
        oWB = oXL.Workbooks.Add(Missing);

        // Get the Active sheet 
        oSheet = (Excel.Worksheet)oWB.ActiveSheet;
        oSheet.Name = sheetName;

        oSheet.Cells[1, 1] = "Daily Finished Job History " + DateTime.Now.ToString("dd/MM/yyyy");

        oSheet.get_Range("A1", "A1").ColumnWidth = 13;
        oSheet.get_Range("B1", "B1").ColumnWidth = 13;
        oSheet.get_Range("C1", "C1").ColumnWidth = 25;
        oSheet.get_Range("A1", "C1").Font.Size = 14;

        oSheet.get_Range("A1", "C1").Font.Bold = true;
        oSheet.get_Range("A1", "C1").Merge(true);
        oSheet.get_Range("A1", "C1").Cells.HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;

        oSheet.get_Range("A3", "C3").Font.Bold = true;

        int rowCount = 3;
        for (int i = 1; i < dt.Columns.Count + 1; i++)
        {
            oSheet.Cells[rowCount, i] = dt.Columns[i - 1].ColumnName;
        }

        foreach (DataRow dr in dt.Rows)
        {
            rowCount += 1;
            for (int i = 1; i < dt.Columns.Count + 1; i++)
            {
                oSheet.Cells[rowCount, i] = dr[i - 1].ToString();
            }
        }

        // Resize the columns 
        oRange = oSheet.get_Range(oSheet.Cells[1, 1],
        oSheet.Cells[rowCount, dt.Columns.Count]);
        //oRange.EntireColumn.AutoFit();

        // Save the sheet and close 
        oSheet = null;
        oRange = null;

        string strParentDirectory = GetParentDirectory();
        strParentDirectory = strParentDirectory + "\\Data";
        if (!Directory.Exists(strParentDirectory))
        {
            Directory.CreateDirectory(strParentDirectory);
        }
        string strFileName = strParentDirectory + "\\DailyFinishedJobHistory_" + DateTime.Now.ToString("yyyyMMdd") + ".xls";
        if (File.Exists(strFileName))
        {
            File.Delete(strFileName);
        }
        FileStream file = new FileStream(strFileName, FileMode.Create);
        file.Close();

        oWB.SaveAs(strFileName, Excel.XlFileFormat.xlWorkbookNormal,
            Missing, Missing, Missing, Missing,
            Excel.XlSaveAsAccessMode.xlExclusive,
            Missing, Missing, Missing,
            Missing, Missing);
        oWB.Close(Missing, Missing, Missing);
        oWB = null;
        oXL.Quit();
    }
    catch
    {
        throw;
    }
    finally
    {
        // Clean up 
        // NOTE: When in release mode, this does the trick 
        GC.WaitForPendingFinalizers();
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();
    }

    return true;
}

public static string GetParentDirectory()
{
    System.IO.DirectoryInfo myDirectory = new DirectoryInfo(Environment.CurrentDirectory);
    return myDirectory.Parent.Parent.FullName;
}

现在我想根据我的数据表中的数据在同一张表中生成图表。

我的 excel 文件如下所示

我读了几篇文章和代码来从这个链接生成图表 http://www.dotnetbull.com/2011/09/exporting-pie-chart-into-excel-file.html http://csharp.net-informations.com /excel/csharp-excel-chart.htm http://www.daniweb.com/software-development/csharp/threads/80834/c-and-excel-chart-ranges

但仍然无法理解生成折线图的代码。如果有人帮助我在同一张表中生成图表，就像我在这里给出的图像一样，那将是非常有帮助的。

谢谢

Answer 1

试试这个作为起点：

'Create & Format Chart
Dim oChart As Excel.Chart

oChart = oXL.Parent.Charts.Add
With oChart
    .Name = "History"
    .HasTitle = True
    .ChartTitle.Font.ColorIndex = 11
    .ChartTitle.Font.Bold = True
    .ChartTitle.Font.Size = 12
    .ChartTitle.Font.Name = "Arial"
    .ChartTitle.Text = "Job History"
    .ChartType = Excel.XlChartType.xlLine
    .HasLegend = True
    .SeriesCollection(1).XValues = "=Sheet1!$A$4:$A$6"
    .SeriesCollection(1).Name = "=Sheet1!$B$3"
    .SeriesCollection(2).Name = "=Sheet1!$C$3"
    .SeriesCollection(3).Name = "=Sheet1!$D$3"
End With