使用 c# 创建多个 Excel 图表对象

Question

我现在花了几个小时试图从我的 C# 应用程序在 Excel 中创建一些图表。我正在尝试创建多个图表对象。有没有更好的方法来做到这一点？我确定行“chartObject[col] = (Excel.Chart)oWB.Charts.Add(Missing.Value, Missing.Value, Missing.Value, Missing.Value);”是我要去错的地方。

目前，当我调用这条线时，它有时会创建最后一张图表的副本，但有时它会起作用。我完全看不懂它的逻辑。

谢谢

private void CreateCharts(Excel.Worksheet oWS, int numRows, int numCols)
    {
        Excel.Workbook oWB = (Excel.Workbook)oWS.Parent;
        Excel.Series oSeries;
        //Excel._Chart chartObject;
        Excel.Chart[] chartObject = new Excel.Chart[numCols];
        Excel.SeriesCollection[] oSeriesCollection = new Excel.SeriesCollection[numCols];
        int length = numRows + 2;
        string colname;

        //then you can assign as much as series you want,
        for (int col = 0; col < numCols; col++)
        {
            //create a new chart
            chartObject[col] = (Excel.Chart)oWB.Charts.Add(Missing.Value, Missing.Value, Missing.Value, Missing.Value);
            chartObject[col].ChartType = Excel.XlChartType.xlLine;
            oSeriesCollection[col] = (Excel.SeriesCollection)chartObject[col].SeriesCollection();

            //add the actual occupancy
            colname = GetExcelColumnName(col * 3 + 1);
            oSeries = oSeriesCollection[col].NewSeries();
            oSeries.Values = oWS.Range[colname + "2", colname + length];

            //add the expected occupancy
            colname = GetExcelColumnName(col * 3 + 2);
            oSeries = oSeriesCollection[col].NewSeries();
            oSeries.Values = oWS.Range[colname + "2", colname + length];
        }
    }

Answer 1

问题在于 Excel 中的 Chart 对象实际上是一个图表工作表，而图表本身是一个 ChartObject 对象，而您使用 Shape 处理它的对象。这里是 a link 和 another one 稍微讨论了一下，还有来自 this MS link 的一些 VBA 代码显示了一点，请注意有几种不同的方法可以完成它：

Sub AddChart_Excel()   
  Dim objShape As Shape   

  ' Create a chart and return a Shape object reference.   
  ' The Shape object reference contains the chart.   
  Set objShape = ActiveSheet.Shapes.AddChart(XlChartType.xlColumnStacked100)   

  ' Ensure the Shape object contains a chart. If so,   
  ' set the source data for the chart to the range A1:C3.  
  If objShape.HasChart Then  
    objShape.Chart.SetSourceData Source:=Range("'Sheet1'!$A$1:$C$3")  
  End If  
End Sub