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我有以下代码，试图将 d.dateofbirth 和 d.dateofdeath 作为字符串返回，但运气不佳。

我曾尝试使用 tostring() 或 convert 但两者都在运行时转换为 sql 因此不起作用，

我需要能够在同一 gridview 单元格中的 2 行上显示 DOB 和 DOD，如下所示：

出生日期

到目前为止，这是我的代码：

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;}
}

按照评论中的建议，在构建 dataProjection 之前更新、移动到列表，

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;}
    }
4

1 回答 1

1

詹姆斯，请考虑在第一次调用“ToList()”之后进行投影，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();
于 2013-09-12T11:28:49.347 回答