字互操作 COMException：“值超出范围。”

Question

我正在尝试从数据库中获取一些数据，将其插入到 Word 文档中，在所选范围上使用 ConvertToTable 将其转换为表格，但我收到 COMException：'Value out of range.'。 我的代码有什么问题，我不明白？

  string finalString = "";
  string rowAsString = "";
  string colAsString = "";
  int NumColumns = 0;
  int NumRows = 0;
  foreach (DataTable table in _ds.Tables)
  {
    foreach (DataColumn col in table.Columns)
    {
      NumColumns++;
      if (NumColumns == table.Columns.Count)
      {
        colAsString += col.Caption;
      }
      else
      {
        colAsString += col.Caption + "\t";
      }
    }
    colAsString.TrimEnd('\t');
    foreach (DataRow row in table.Rows)
    {
      NumRows++;
      rowAsString += string.Join("\t", row.ItemArray.Select(c => c.ToString()).ToArray()) + Environment.NewLine;
    }
  }
  if (NumRows > 0)
  {
    finalString = colAsString + Environment.NewLine + rowAsString.Substring(0, rowAsString.Length - 2);

    Word.Selection sel = Globals.ThisAddIn.Application.Selection;
    sel.Text = finalString;
    Word.Range rng = sel.Range;

    Application.DoEvents();

    object Separator = 1;
    object AutoFitBehavior = 0;

    rng.ConvertToTable(Separator, (object)NumColumns, (object)NumRows, AutoFitBehavior);
  }

有关错误的更多详细信息：

************** Exception Text **************
System.Runtime.InteropServices.COMException (0x800A1200): Value out of range
   at Microsoft.Office.Interop.Word.Range.ConvertToTable(Object& Separator, Object& NumRows, Object& NumColumns, Object& InitialColumnWidth, Object& Format, Object& ApplyBorders, Object& ApplyShading, Object& ApplyFont, Object& ApplyColor, Object& ApplyHeadingRows, Object& ApplyLastRow, Object& ApplyFirstColumn, Object& ApplyLastColumn, Object& AutoFit, Object& AutoFitBehavior, Object& DefaultTableBehavior)