IExcelDataReader读取的是xlsx而不是xls文件

我是新的Excel数据读取器，我有一个问题。 我的程序只读取.xlsx文件，无法读取.xls文件。 任何帮助将不胜感激这里是我的代码： 

OpenFileDialog ope = new OpenFileDialog(); ope.Filter = "Excel Files|*.xls;*.xlsx;*.xlsm"; Invoke((Action)(() => { ope.ShowDialog(); })); label2.Invoke((MethodInvoker)delegate { label2.Visible = true; }); FileStream stream = new FileStream(ope.FileName, FileMode.Open); IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream); DataSet result = excelReader.AsDataSet(); string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["SQL"].ConnectionString; SqlConnection conna = new SqlConnection(connectionString); conna.Open(); foreach (DataTable table in result.Tables) { foreach (DataRow dr in table.Rows) { try { } } } excelReader.Close(); stream.Close();

非常感谢！

打开xls文件时的Debug： 

 The thread 0xf58 has exited with code 259 (0x103). The thread 0x2764 has exited with code 259 (0x103). 'ProjectExcelv2.vshost.exe' (CLR v4.0.30319: ProjectExcelv2.vshost.exe): Loaded 'C:\Users\Marios\Desktop\C# Projects\eStatistics\ProjectExcelv2\ProjectExcelv2\bin\Debug\ProjectExcelv2.exe'. Symbols loaded. 'ProjectExcelv2.vshost.exe' (CLR v4.0.30319: ProjectExcelv2.vshost.exe): Loaded 'C:\Users\Marios\Desktop\C# Projects\eStatistics\ProjectExcelv2\ProjectExcelv2\bin\Debug\Excel.4.5.dll'. Symbols loaded. 'ProjectExcelv2.vshost.exe' (CLR v4.0.30319: ProjectExcelv2.vshost.exe): Loaded 'C:\Users\Marios\Desktop\C# Projects\eStatistics\ProjectExcelv2\ProjectExcelv2\bin\Debug\ICSharpCode.SharpZipLib.dll'. Module was built without symbols. A first chance exception of type 'ICSharpCode.SharpZipLib.Zip.ZipException' occurred in ICSharpCode.SharpZipLib.dll 'ProjectExcelv2.vshost.exe' (CLR v4.0.30319: ProjectExcelv2.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.Transactions\v4.0_4.0.0.0__b77a5c561934e089\System.Transactions.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'ProjectExcelv2.vshost.exe' (CLR v4.0.30319: ProjectExcelv2.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.EnterpriseServices\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.EnterpriseServices.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. 'ProjectExcelv2.vshost.exe' (CLR v4.0.30319: ProjectExcelv2.vshost.exe): Loaded 'C:\Windows\Microsoft.Net\assembly\GAC_32\System.EnterpriseServices\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.EnterpriseServices.Wrapper.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled. A first chance exception of type 'System.NullReferenceException' occurred in ProjectExcelv2.exe

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