/// <summary>
/// Excel转换成DataTable（.xls）
/// </summary>
/// <param name="filePath">Excel文件路径</param>
/// <returns></returns>
public static DataTable ExcelToDataTable(string filePath)
{
var dt = new DataTable();
using (var file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
var hssfworkbook = new HSSFWorkbook(file);
var sheet = hssfworkbook.GetSheetAt(0);
for (var j = 0; j < 5; j++)
{
dt.Columns.Add(Convert.ToChar(((int)'A') + j).ToString());
}
var rows = sheet.GetRowEnumerator();
while (rows.MoveNext())
{
var row = (HSSFRow)rows.Current;
var dr = dt.NewRow();
for (var i = 0; i < row.LastCellNum; i++)
{
var cell = row.GetCell(i);
if (cell == null)
{
dri = null;
}
else
{
switch (cell.CellType)
{
case CellType.Blank:
dri = "null";
break;
case CellType.Boolean:
dri = cell.BooleanCellValue;
break;
case CellType.Numeric:
dri = cell.ToString();
break;
case CellType.String:
dri = cell.StringCellValue;
break;
case CellType.Error:
dri = cell.ErrorCellValue;
break;
case CellType.Formula:
try
{
dri = cell.NumericCellValue;
}
catch
{
dri = cell.StringCellValue;
}
break;
default:
dri = "=" + cell.CellFormula;
break;
}
}
}
dt.Rows.Add(dr);
}
}
return dt;
}