C# 在LINQ查询中使用GROUPBY时，无法翻译LINQ表达式“GroupByShapeExpression:”

我想对表中的每一列求和，如下所示：

此表的模型称为TotalConfiguration，如下所示：

public class Projects
    {
        [Key]
        public Guid IdProject { get; set; }
        [Required]
        public string OwnerName { get; set; }
        [Required]
        public string ProjectAdress1 { get; set; }
        public string ProjectAdress2 { get; set; }
        [Required]
        public string ProjectPostcode { get; set; }
        [Required]
        public string ProjectCity { get; set; }
        public TotalConfiguration TotalConfiguration { get; set; }
}

 public class ProjectsUser
    { 
        [Key]
        public int IdProjectsUser { get; set; }
        [ForeignKey("User")]
        public Guid IdUser { get; set; }
        [ForeignKey("Projects")]
        public Guid IdProject { get; set; }
        [Required]
        public virtual User User { get; set;}
        [Required]
        public virtual Projects Projects { get; set; }
    }

此名为“项目”的表的模型如下所示：

public class Projects
    {
        [Key]
        public Guid IdProject { get; set; }
        [Required]
        public string OwnerName { get; set; }
        [Required]
        public string ProjectAdress1 { get; set; }
        public string ProjectAdress2 { get; set; }
        [Required]
        public string ProjectPostcode { get; set; }
        [Required]
        public string ProjectCity { get; set; }
        public TotalConfiguration TotalConfiguration { get; set; }
}

 public class ProjectsUser
    { 
        [Key]
        public int IdProjectsUser { get; set; }
        [ForeignKey("User")]
        public Guid IdUser { get; set; }
        [ForeignKey("Projects")]
        public Guid IdProject { get; set; }
        [Required]
        public virtual User User { get; set;}
        [Required]
        public virtual Projects Projects { get; set; }
    }

这个名为ProjectsUser的表格的模型如下所示：

public class Projects
    {
        [Key]
        public Guid IdProject { get; set; }
        [Required]
        public string OwnerName { get; set; }
        [Required]
        public string ProjectAdress1 { get; set; }
        public string ProjectAdress2 { get; set; }
        [Required]
        public string ProjectPostcode { get; set; }
        [Required]
        public string ProjectCity { get; set; }
        public TotalConfiguration TotalConfiguration { get; set; }
}

 public class ProjectsUser
    { 
        [Key]
        public int IdProjectsUser { get; set; }
        [ForeignKey("User")]
        public Guid IdUser { get; set; }
        [ForeignKey("Projects")]
        public Guid IdProject { get; set; }
        [Required]
        public virtual User User { get; set;}
        [Required]
        public virtual Projects Projects { get; set; }
    }

在我的控制器中，我想将所有列和TotalConfiguration的对象相加。我的代码：

public IActionResult GetTotalConfiguration GUID用户ID { TotalConfiguration totalConfiguration3=\u context.ProjectsUser .Wherex=>x.IdUser==userId .GroupByx=>x.IdUser .Selectx=>新的总体配置 { 一月=x.Sumx=>x.Projects.TotalConfiguration.一月， 二月=x.Sumx=>x.Projects.TotalConfiguration.一月， 三月=x.Sumx=>x.Projects.TotalConfiguration.一月， April=x.Sumx=>x.Projects.TotalConfiguration.一月， May=x.Sumx=>x.Projects.TotalConfiguration.一月， June=x.Sumx=>x.Projects.TotalConfiguration.一月， July=x.Sumx=>x.Projects.TotalConfiguration.一月， 八月=x.Sumx=>x.Projects.TotalConfiguration.一月， 九月=x.Sumx=>x.Projects.TotalConfiguration.一月， 十月=x.Sumx=>x.Projects.TotalConfiguration.一月， 十一月=x.Sumx=>x.Projects.TotalConfiguration.一月， 十二月=x.Sumx=>x.Projects.TotalConfiguration.一月， } .FirstOrDefault； 如果运行此代码，则会出现错误：

System.InvalidOperationException: 'The LINQ expression 'GroupByShaperExpression:
KeySelector: p.IdUser, 
ElementSelector:EntityShaperExpression: 
    EntityType: ProjectsUser
    ValueBufferExpression: 
        ProjectionBindingExpression: EmptyProjectionMember
    IsNullable: False

    .Sum(x => x.Projects.TotalConfiguration.January)' could not be translated. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to 'AsEnumerable', 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'. See https://go.microsoft.com/fwlink/?linkid=2101038 for more information.'

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当我将结果保存到IEnumerable时，没有出现此错误，但我想将结果保存为TotalConfiguration对象

您不能在GroupBy之后使用导航属性

应重写查询：

变量查询= 来自pu in_context.ProjectsUser 设tc=pu.TotalConfiguration 按pu.IdUser将tc分组为g 选择新的总体配置 { idTotalConfiguration=g.键， 一月=x.Sumx=>x.一月， 二月=x.Sumx=>x.二月， 三月=x.Sumx=>x.March， 四月=x.Sumx=>x.April， 五月=x.Sumx=>x.May， 六月=x.Sumx=>x.June， 七月=x.Sumx=>x.July， 八月=x.Sumx=>x.August， 九月=x.Sumx=>x.九月， 十月=十月份， 11月=x.Sumx=>x.11月， 十二月=x.Sumx=>x.December };

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非常非常感谢您的回答。我非常感谢您的帮助。我尝试使用您的代码，但出现了很多错误。我尝试修复它并测试此代码，但出现了与我的问题相同的错误。让我检查一下。从内存中在浏览器中编写。@AdrianWróbel，修复了答案。