將DateTime轉換為字符串實體框架

Question

我有以下代碼，嘗試將d.dateofbirth和d.dateofdeath作為字符串返回，但運氣不佳。

我嘗試使用tostring（）或convert，但是在運行時都將它們都轉換為sql，因此無法正常工作，

我需要能夠在同一gridview單元中的兩行上顯示DOB和DOD，如下所示：

DOB DOD

到目前為止，這是我的代碼：

fmsEntities context = new fmsEntities();
var query = from f in context.funerals
            where f.IsPencil == 0
            join d in context.deceaseddetails on f.DeceasedID equals d.ID
            join i in context.funeralservices on f.ID equals i.FuneralID
            where i.IsAlternative == 0
            join h in context.htvalues on f.HtValuesID equals h.ID
            join p in context.placeofdeaths on f.PlaceOfDeathID equals p.ID
            join c in context.coroners on f.CoronerID equals c.ID
            select new DataBindingProjection { DeceasedName = (d.LastName + Environment.NewLine + d.FirstName),
            DOBDOD = Convert.ToString(d.DateOfBirth)};

var dataobjects = query.ToList();

dataGridView1.DataSource = dataobjects;

private class DataBindingProjection
{
    public string DeceasedName {get; set;}
    public string DOBDOD {get; set;}
}

更新，按照注釋中的建議在構建dataProjection之前移至ToList，

fmsEntities context = new fmsEntities();
        var query = (from f in context.funerals
                    where f.IsPencil == 0
                    join d in context.deceaseddetails on f.DeceasedID equals d.ID
                    join i in context.funeralservices on f.ID equals i.FuneralID
                    where i.IsAlternative == 0
                    join h in context.htvalues on f.HtValuesID equals h.ID
                    join p in context.placeofdeaths on f.PlaceOfDeathID equals p.ID
                    join c in context.coroners on f.CoronerID equals c.ID
                    select new { f , d , i , h , p , c }).ToList();

        var dataobjects = query.Select(d => new DataBindingProjection {DeceasedName = (d.LastName + Environment.NewLine + d.FirstName),
                                        DOBDOD = (d.DateOfBirth.ToString() + Environment.NewLine + d.DateOfDeath.ToString())});

        dataGridView1.DataSource = dataobjects;
    }

    private class DataBindingProjection
    {
        public string DeceasedName {get; set;}
        public string DOBDOD {get; set;}
    }

Answer 1

James，請考慮在首次調用“ ToList（）”之后進行投影，如下所示：

var dataobjects = query
.ToList()
.Select(d => new DataBindingProjection { DeceasedName = (d.LastName + Environment.NewLine + d.FirstName),
            DOBDOD = Convert.ToString(d.DateOfBirth)})
.ToList();