Winform中导入exicel文件

Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
Microsoft.Office.Interop.Excel.Workbook workbook;
Microsoft.Office.Interop.Excel.Worksheet worksheet;

object oMissing = System.Reflection.Missing.Value;

workbook = excel.Workbooks.Open(filename, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing);

worksheet = ( Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];

int rowCount = worksheet.UsedRange.Rows.Count;
int colCount = worksheet.UsedRange.Columns.Count;

Microsoft.Office.Interop.Excel.Range range1;

System.Data.DataTable dt = new System.Data.DataTable();

for (int i = 0; i <= colCount; i++)
{
try
{
range1 = worksheet.get_Range((object)worksheet.Cells[1, i + 1], (object)worksheet.Cells[1, i + 1]);
dt.Columns.Add(range1.Value2.ToString());

}
catch (Exception)
{

}
}
for (int j = 1; j < rowCount; j++)
{
DataRow dr = dt.NewRow();
for (int i = 0; i <= colCount; i++)
{
try
{
range1 = worksheet.get_Range((object)worksheet.Cells[j + 1, i + 1], (object)worksheet.Cells[j + 1, i + 1]);
dr[i] = range1.Value2.ToString();
}
catch (Exception)
{ }
}

dt.Rows.Add(dr);
}
//DataGridView01.DataSource = dt;
excel.Quit();