简单连接中的LINQ错误 - 连接子句中某个表达式的类型不正确

Question

我正在尝试使用JOIN执行简单的LINQ，但会出现错误

the type of one of the expressions in the join clause is incorrect

CODE：

var select2 = from si in db.San_Imovel
                              join sic in db.San_Imovel_caracteristica      <--- ERROR 
                              on si.Imovel_Id equals sic.Imovel_Id
                             where si.Credenciada_Id == credenciada_Id                    
                             select new
                             {
                                 si.Celula_Id, 
                                 si.Credenciada_Id, 
                                 si.Imovel_Id,
                                 si.NomeArquivo, 
                                 si.TipoDsc1, 
                                 si.BairroDsc1,
                                 si.AreaRealPrivativa,                                  
                                 si.ValorImovel,
                                 si.ValorCondominio, 
                                 si.ValorIPTU, 
                                 si.Lat2, 
                                 si.Lon2,
                                 si.Bairro1, 
                                 si.NomeCidade,
                                 si.Transacao_ID
                             };

Answer 1

如果您的媒体资源包含long和int?类型，那么您可以尝试此加入：

var select2 = from si in db.San_Imovel
              join sic in db.San_Imovel_caracteristica
                            .Where(x => x.Imovel_Id.HasValue)
              on si.Imovel_Id equals (long)sic.Imovel_Id.Value
              where si.Credenciada_Id == credenciada_Id                    
              select new { ... }