导入excle（非空）后，显示空白

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导入excel代码：

  private void button1_Click_1(object sender, EventArgs e)
      {
         try
         {
            OpenFileDialog openFileDialog = new OpenFileDialog();

            openFileDialog.Filter = "Excel File (.xls,.xlsx)|*.xls; *.xlsx";

            openFileDialog.FilterIndex = 1;

            openFileDialog.Multiselect = false;

            DialogResult dResult = openFileDialog.ShowDialog();

            if (dResult == DialogResult.OK)
            {
                  System.IO.FileStream stream = new System.IO.FileStream(openFileDialog.FileName, System.IO.FileMode.Open, System.IO.FileAccess.Read, System.IO.FileShare.ReadWrite);

                  sp.gcSpreadSheet1.OpenExcel(stream);

                  stream.Close();

                  MessageBox.Show("导入成功");

            }
         }
         catch (Exception ex)
         {
            MessageBox.Show(ex.ToString());
         }
      }

导入前正常

导入后空白（excel文件并不是空白的）