C#读取Excel表中的数据时，为何有些行的字段内容读取不到

解决同一列中“字符串”和“数字”两种格式同时存在，读取时，不能正确显示“字符串”格式的问题

 

 OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.RestoreDirectory = true;
            openFileDialog.DefaultExt = "xls";
            openFileDialog.Filter = "Excel files(*.xls)|*.xls";
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                #region Excel to DataSet
                string fileName = openFileDialog.FileName;
           &n