c# 根据泛型返回任意类型

注意通过这种方式，类型要能转化成功才行，不然会报类型转化的错误的

/// <summary>
/// 根据传递过来的泛型来获取对应的类型数据
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="hSSFCell"></param>
/// <returns></returns>
private T GetCellValue<T>(NPOI.SS.UserModel.ICell hSSFCell)
{
    Type t = typeof(T);
    if (hSSFCell == null)
    {
        return default(T);
    }
    if (hSSFCell.CellType == NPOI.SS.UserModel.CellType.Numeric)
    {
        // NPOI中数字和日期都是NUMERIC类型的，这里对其进行判断是否是日期类型
        if (NPOI.SS.UserModel.DateUtil.IsCellDateFormatted(hSSFCell))
        {
            return (T)(object)hSSFCell.DateCellValue;
        }
        return (T)(object)hSSFCell.NumericCellValue;
    }
    if (hSSFCell.CellType == NPOI.SS.UserModel.CellType.String)
    {
        return (T)(object)hSSFCell.StringCellValue;
    }
    if (hSSFCell.CellType == NPOI.SS.UserModel.CellType.Boolean)
    {
        return (T)(object)hSSFCell.BooleanCellValue;
    }
    if (hSSFCell.CellType == NPOI.SS.UserModel.CellType.Blank)
    {
        return default(T);
    }
    if (hSSFCell.CellType == NPOI.SS.UserModel.CellType.Error)
    {
        return (T)(object)hSSFCell.ErrorCellValue;
    }
    return default(T);
}