關於從數據表生成折線圖的問題c＃

Question

我正在使用Interop.Excel從數據表導出數據並生成折線圖。我有一個代碼，從數據表到Excel並創建圖表有哪些出口數據，但該代碼在這一行

Excel.Axis yAxis = (Excel.Axis)xlChart.Axes(Excel.XlAxisType.xlSeriesAxis, 
Excel.XlAxisGroup.xlPrimary); 

和錯誤消息我得到給錯誤值不在預期範圍內

我的線圖生成完整代碼。

private void button1_Click(object sender, EventArgs e) 
    { 
     System.Data.DataTable dt = GetGraphData(); 

     Excel.Application xla = new Excel.Application(); 
     xla.Visible = true; 
     Excel.Workbook wb = xla.Workbooks.Add(Excel.XlSheetType.xlWorksheet); 
     Excel.Worksheet ws = (Excel.Worksheet)wb.ActiveSheet; 
     //********************** Now create the chart. ***************************** 
     Excel.ChartObjects chartObjs = (Excel.ChartObjects)ws.ChartObjects(Type.Missing); 
     Excel.ChartObject chartObj = chartObjs.Add(250, 60, 300, 300); 
     Excel.Chart xlChart = chartObj.Chart; 

     int nRows = 2; 
     int nColumns = dt.Rows.Count; 
     string upperLeftCell = "B2"; 
     int endRowNumber = System.Int32.Parse(upperLeftCell.Substring(1)) 
      + nRows - 1; 
     char endColumnLetter = System.Convert.ToChar(
      Convert.ToInt32(upperLeftCell[0]) + nColumns - 1); 
     string upperRightCell = System.String.Format("{0}{1}", 
      endColumnLetter, System.Int32.Parse(upperLeftCell.Substring(1))); 
     string lowerRightCell = System.String.Format("{0}{1}", 
      endColumnLetter, endRowNumber); 

     Excel.Range rg = ws.get_Range(upperLeftCell, lowerRightCell); 
     for (int i = 1; i <= dt.Rows.Count; i++) 
     { 
      rg[1, i] = dt.Rows[i - 1][0].ToString();   //For Adding Header Text 
      rg[2, i] = int.Parse(dt.Rows[i - 1][1].ToString()); //For Adding Datarow Value 
     } 


     Excel.Range chartRange = ws.get_Range(upperLeftCell, lowerRightCell); 
     xlChart.SetSourceData(chartRange, Type.Missing); 
     xlChart.ChartType = Excel.XlChartType.xlLine; 

     // *******************Customize axes: *********************** 
     Excel.Axis xAxis = (Excel.Axis)xlChart.Axes(Excel.XlAxisType.xlCategory, 
      Excel.XlAxisGroup.xlPrimary); 
     //xAxis.HasTitle = true; 
     // xAxis.AxisTitle.Text = "X Axis"; 

     Excel.Axis yAxis = (Excel.Axis)xlChart.Axes(Excel.XlAxisType.xlSeriesAxis, 
      Excel.XlAxisGroup.xlPrimary); 
     //yAxis.HasTitle = true; 
     //yAxis.AxisTitle.Text = "Y Axis"; 

     Excel.Axis zAxis = (Excel.Axis)xlChart.Axes(Excel.XlAxisType.xlValue, 
      Excel.XlAxisGroup.xlPrimary); 
     //zAxis.HasTitle = true; 
     //zAxis.AxisTitle.Text = "Z Axis"; 

     // *********************Add title: ******************************* 
     xlChart.HasTitle = true; 
     xlChart.ChartTitle.Text = "Project Status Graph"; 

     // *****************Set legend:*************************** 
     xlChart.HasLegend = true; 

     FileStream file = new FileStream(@"c:\pop.xls", FileMode.Create); 
     file.Close(); 

     wb.SaveCopyAs(@"c:\pop.xls"); 

     // ****************For Quiting The Excel Aplication *********************** 
     if (xla != null) 
     { 
      xla.DisplayAlerts = false; 
      wb.Close(); 
      wb = null; 
      xla.Quit(); 
      xla = null; 
     } 
    } 

    private System.Data.DataTable GetGraphData() 
    { 
     System.Data.DataTable dt = new System.Data.DataTable(); 
     dt.Columns.AddRange(new DataColumn[2] { new DataColumn("ProjectStatus"), new DataColumn("per") }); 

     DataRow dr1 = dt.NewRow(); 
     dr1[0] = "Compleet"; 
     dr1[1] = 20; 
     dt.Rows.Add(dr1); 

     DataRow dr2 = dt.NewRow(); 
     dr2[0] = "Pending"; 
     dr2[1] = 20; 
     dt.Rows.Add(dr2); 

     DataRow dr3 = dt.NewRow(); 
     dr3[0] = "UnCompleet"; 
     dr3[1] = 20; 
     dt.Rows.Add(dr3); 

     return dt; 

    } 

正在尋求幫助。謝謝

Answer 1

我的同事告訴我，根據intellisense，第一個參數（Excel.XlAxisType.xlSeriesAxis）的值僅對3D圖表有效。

你在創建什麼樣的圖表？