没有使用硬代码的Excel到DataGridView

我试图读取Excel数据网格视图，而不做硬编码风格。 我试图做到这一点时遇到了错误。 任何人都可以帮助我吗？

Excel.Workbook workbook; Excel.Worksheet NwSheet; Excel.Range ShtRange; Microsoft.Office.Interop.Excel.Application ExcelObj = null; OpenFileDialog filedlgExcel = new OpenFileDialog(); filedlgExcel.Title = "Select file"; filedlgExcel.InitialDirectory = @"c:\"; filedlgExcel.FileName = txtFileName.Text; filedlgExcel.Filter = "Excel Sheet(*.xlsx)|*.xlsx|All Files(*.*)|*.*"; filedlgExcel.FilterIndex = 1; filedlgExcel.RestoreDirectory = true; if (filedlgExcel.ShowDialog() == DialogResult.OK) { //Excel.Workbook theWorkbook = ExcelObj.Workbooks.Open( // filedlgExcel.FileName, 0, true, 5, // "", "", true, Excel.XlPlatform.xlWindows, "\t", false, false, // 0, true); workbook = ExcelObj.Workbooks.Open(filedlgExcel.FileName , Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value); NwSheet = (Excel.Worksheet)workbook.Sheets.get_Item(1); ShtRange = NwSheet.UsedRange; //gives the used cells in sheet //Reading Excel file. //Creating dataTable to read the containt of the Sheet in File. //Set header name for (int Cnum = 1; Cnum <= ShtRange.Columns.Count; Cnum++) { dt.Columns.Add(new DataColumn((ShtRange.Cells[1, Cnum] as Excel.Range).Value2.ToString())); } dt.AcceptChanges(); //store coumn names to array string[] columnNames = (from dc in dt.Columns.Cast<DataColumn>() select dc.ColumnName).ToArray(); //populate fields for (int Rnum = 2; Rnum <= ShtRange.Rows.Count; Rnum++) { DataRow dr = dt.NewRow(); for (int Cnum = 1; Cnum <= ShtRange.Columns.Count; Cnum++) { dr[Cnum - 1] = (ShtRange.Cells[Rnum, Cnum] as Excel.Range).Value2.ToString(); } dt.Rows.Add(dr); dt.AcceptChanges(); } workbook.Close(true, Missing.Value, Missing.Value); ExcelObj.Quit(); foreach (DataRow dr in dt.Rows) { string strEmployee = dr["Employee Name"].ToString(); obj1 = new List<employeeschedule>(); for (int i = 1; i < dt.Columns.Count; i++) { string period = dr[i].ToString(); string[] split = period.Split('–'); employeeschedule es = new employeeschedule(); string day = columnNames[i]; if (split[0] == "Rest Day") { es.day = day; es.startTime = split[0]; es.endTime = split[0]; es.restDay = "Yes"; } else { es.day = day; es.startTime = split[0]; es.endTime = split[1]; es.restDay = "No"; } obj1.Add(es); } dict.Add(strEmployee, obj1); dgvEmployeeShift.DataSource = dt; } } } 

他们向我展示了一个错误“对象引用未设置为对象的实例”。

 workbook = ExcelObj.Workbooks.Open(filedlgExcel.FileName , Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value); 

任何帮助将不胜感激。

Answer 1

您在开始时将ExcelObj设置为null，然后从不初始化它

 Microsoft.Office.Interop.Excel.Application ExcelObj = null; 

尝试使它= new Microsoft.Office.Interop.Excel.Application();

Answer 2

或者，您可以使用OleDb提供程序来读取Excel工作表。

 string cnStr=@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=c:\myFolder\myExcel2007file.xlsx;Extended Properties=" + "\"Excel 12.0 Xml;HDR=YES;IMEX=1\""; DataTable dt=new DataTable(); string sql="Select * From [Sheet1$]"; using(OleDbConnection cn=new OleDbConnection(cnstr)) { using(OleDbDataAdapter adapter=new OleDbDataAdapter(sql,cn)) { adapter.Fill(dt); } } 

OleDb是ADO.NET（.net框架的数据库集成API）的提供者API，它公开来自不同数据源的数据，包括Microsoft Access数据库或Microsoft Excel电子表格等等。

看看MSDN文章/教程的链接：

1. 如何使用ADO.NET在Excel工作簿中使用Visual Basic .NET检索和修改logging
2. 如何使用Visual C＃2005或Visual C＃.NET将数据传输到Excel工作簿