添加工作表到当前Excel工作簿

Question

我试图用C＃中的工作表添加到现有的Excel实例，但我得到

对象的错误不设置到对象的实例

抛出的这行代码是与newSheet =

开始我不知道这是为什么被抛出，因为我声明我的变量newSheet，我已经实例化xlApp之一----我需要做什么为了使这个语法按预期工作而改变？

public static void AddNewSheet() 
{ 
    Excel.Application xlApp; 
    xlApp = new Excel.Application(); 
    Excel.Worksheet Jobs, Estimates; 
    string filePath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + @"\Test.xlsx"; 
    var xlWorkBook = xlApp.Workbooks.Open(filePath); 
    Excel.Worksheet newSheet; 

    //Add a new worksheet to the workbook 
    newSheet = (Excel.Worksheet)xlApp.Worksheets.Add(System.Reflection.Missing.Value, 
              xlWorkBook.Worksheets[xlWorkBook.Worksheets.Count], 
              System.Reflection.Missing.Value, 
              System.Reflection.Missing.Value); 
} 

编辑
附加代码 - 与加入已创建工作簿的工作表希望帮助。

namespace GenerateExcelWorkbookData 
{ 
    public partial class Form1 : Form 
    { 
     public static Excel.Application xlApp; 
     public static Excel.Workbook xlWorkBook; 
     public static Excel.Worksheet xlWorkSheet; 
     public static Excel.Worksheet newSeet; 

     Main() 
     { 
      //Query Excel To Get DataTable Here 

      //Excel Info 
      xlApp = new Excel.Application(); 
      xlWorkBook = xlApp.Workbooks.Add(misValue); 
      xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1); 

      CreateSubWorksheets(); 
     } 
     public static void CreateSubWorksheets() 
     { 
      string sheetNameprefix = "SS"; 
      Excel.Worksheet sheet1; 

      sheet1 = xlApp.ActiveWorkbook.Worksheets.Item["Newly Added"]; 
      Excel.Range range = sheet1.Range["A1"].CurrentRegion; 
      object OriginalData = range.Value; 
      string OriginalAddress = range.Address; 

      while (range.Cells[2, 1].Value != null && range.Cells[2, 1].Value != "") 
      { 
       range.AutoFilter(1, range.Cells[2, 1].Value); 

       newSeet = (Excel.Worksheet)xlApp.Worksheets.Add(System.Reflection.Missing.Value, 
               xlWorkBook.Worksheets[xlWorkBook.Worksheets.Count], 
               System.Reflection.Missing.Value, 
               System.Reflection.Missing.Value); 

       //Do more stuff here 
      } 
     } 
    } 
} 

Answer 1

尝试......

Microsoft.Office.Interop.Excel.Application Excel = null; 
     Microsoft.Office.Interop.Excel._Workbook oWB = null; 
     Microsoft.Office.Interop.Excel._Worksheet oSheet = null; 

     try 
     { 
      Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application(); 

      if (xlApp == null) 
      { 
       return false; 
      } 

      Excel.Workbook xlWorkBook; 
      Excel.Worksheet xlWorkSheet; 
      object misValue = System.Reflection.Missing.Value; 
      xlWorkBook = xlApp.Workbooks.Add(misValue); 

      xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.Add(); 
      xlWorkSheet.Name = "Details"; 


}