npio导出put

var mapper = new NMapper.Mapper();
mapper.Map<Model>("columnName", m => m.属性, tryPut: (c, m) =>
{
    var ismain = ((Model)m).属性;
    c.CurrentValue = ismain.HasValue ? (属性.Value ? "Y" : "N") : ""; 
    return true;
});
mapper.Put<Model>(DataList, "Sheeet_Name", true)
response.Contents = stream => { mapper.Workbook.Write(stream); };