无法将源类型'System Linq IQueryable <decimal>'转换为目标类型十进制

Question

我的linq代码是;

decimal A = (from _a in parameterEntities.BlockOfBuildingsAndParcels 
        where _a.status == 1 && _a.isActive == "1" 
        select _a.areaOfDecar) 

_a.areaOfDecar类型是decimal但它仍需要选择只有one价值，你需要使用FirstOrDefault只选择工作不正常

Answer 1

您试图分配IQueryable<decimal>到decimal一个记录：

decimal A = (from _a in parameterEntities.BlockOfBuildingsAndParcels 
      where _a.status == 1 && _a.isActive == "1" 
      select _a.areaOfDecar).FirstOrDefault();