C#读取Excel报错：exception from HRREULT解决方案

C#读取Excel报错：exception from HRREULT

C# code

Object Nothing = Missing.Value;            //WdSaveFormat 为Excel文档的保存格式             object format = Excel.XlFileFormat.xlOpenXMLWorkbook;            Excel.XlFileFormat version = Excel.XlFileFormat.xlExcel8;            OpenFileDialog openFile = new OpenFileDialog();            openFile.Filter = "Excel文档(*.xlsx)|*.xlsx|Excel97-2003文档(*.xls)|*.xls";            if (System.Windows.Forms.DialogResult.OK == openFile.ShowDialog())            {                string path = openFile.FileName;//文件路径变量                 if (System.IO.Path.GetExtension(path).ToLower() == ".xlsx")                {                    version = Excel.XlFileFormat.xlOpenXMLWorkbook;                }                try                {                    Excel.Application excelApp = new Excel.Application();               //Excel应用程序变量                     Excel.Workbook excelBook = excelApp.Workbooks.Open(path, version, Nothing, Nothing, Nothing, Nothing, Excel.XlSaveAsAccessMode.xlExclusive, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing, Nothing);                    Excel.Worksheet excelSheet = (Excel.Worksheet)excelApp.ActiveSheet;                    Excel.Range test = (Excel.Range)excelSheet.Cells[1, 1];                    MessageBox.Show(test.Value2.ToString());                }                catch (Exception ex)                {                    MessageBox.Show("Excel创建失败！\n原因：" + ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);                }            }