Question

我正在尝试加入LINQ＆amp; LAMBDA。但是获取错误声明无法将匿名类型＃1隐式转换为BRAND_NAME_MAP_ID。我对Lambdas很新，并且坚持到这里。

public BRAND_NAME_MAP_MASTER GetBrandNameBrandNameMapID(int BrandNameMapID)
{
    PFC_BRAND_NAME_MAP_MASTER objBrandNameMap = Db.PFC_BRAND_NAME_MAP_MASTERs
        .Join(SIRDC.INGREDIENT_BRAND_NAME_MAPs,
              a => a.BRAND_NAME_MAP_ID, 
              b => b.BRAND_NAME_MAP_ID,
              (a, b) => new {a, b})
        .Where(x => x.a.BRAND_NAME_MAP_ID == PFCBrandNameMapID)
        .FirstOrDefault(); //Getting error here

    return objPFCBrandNameMap;
}

Answer 1

您的查询返回包含两个属性的匿名类型，a为PFC_BRAND_NAME_MAP_MASTER，b为INGREDIENT_BRAND_NAME_MAP。看起来你只需要第一个属性，所以只需添加一个Select来获取它：

PFC_BRAND_NAME_MAP_MASTER objBrandNameMap = Db.PFC_BRAND_NAME_MAP_MASTERs
    .Join(SIRDC.INGREDIENT_BRAND_NAME_MAPs,
          a => a.BRAND_NAME_MAP_ID, 
          b => b.BRAND_NAME_MAP_ID,
          (a, b) => new {a, b})
    .Where(x => x.a.BRAND_NAME_MAP_ID == PFCBrandNameMapID)
    .Select(x => x.a) /Add this line
    .FirstOrDefault();

不能隐式地将anonymoustype＃1转换为Object

1 个答案: