Linq中的case语句可以为null的datetime字段

Question

我有可查询数据时间字段的linq查询,该字段根据条件填充值.

var result=(from t1 in context.table1
            join t2 in context.table2 
            on t1.id equals t2.fieldId
            select new model1
            {
                name= t2.name,
                DateCompleted = t1.Status == "Success" 
                    ? Convert.ToDateTime(t1.CompletedDate)
                    : Null
            }).ToList();

这里DateCompleted可以为空.如果状态成功那么我只需要完成日期.其他明智的我需要显示null.现在":Null"部分抛出错误.

谢谢Subin

Answer 1

试试这个

var result=(from t1 in context.table1
             join t2 in context.table2 
            on t1.id equals t2.fieldId
            select new model1
            {
             name= t2.name,
             DateCompleted = t1.Status == "Success" ? Convert.ToDateTime(t1.CompletedDate): (DateTime?)null
                                                           }).ToList();