C# 在ASP.NET核心中延迟加载后未加载虚拟属性

首先，我读了所有属于这个问题的答案，但到目前为止没有任何帮助，所以在标记为重复之前，先读一次

我创建了一个名为ProjectMaster的实体，该实体的虚拟属性名为ClientMaster。当我只在mvc中工作时，它正在加载数据。但现在我已经迁移到CORE，这里没有加载。 在谷歌搜索之后，我知道有两件事需要实现，即使用延迟加载加载虚拟属性

• 安装Microsoft.EntityFrameworkCore.Proxies

• 在启动内部的ConfigureServices中调用

  UseLazyLoadingProxies（）

  服务

我已经完成了这两个步骤，也完成了各种备选方案。 但我仍然无法加载数据。在这里，我将共享entity和ConfigurationService方法

实体：

[Table("ProjectMaster")]
public partial class ProjectMaster
{
    [Key]
    public Guid ProjectId { get; set; }

    [Required]
    [StringLength(500)]
    public string ProjectName { get; set; }

    [Required]
    [StringLength(500)]
    public string ProjectCode { get; set; }

    public Guid ClientId { get; set; }

    public Guid CreatedBy { get; set; }

    public virtual ClientMaster ClientMaster { get; set; }
}

[Table("ClientMaster")]
public partial class ClientMaster
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public ClientMaster()
    {
        ProjectMasters = new HashSet<ProjectMaster>();
    }

    [Key]
    public Guid ClientId { get; set; }

    [Required]
    [StringLength(100)]
    public string ClientName { get; set; }

    public Guid CreatedBy { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<ProjectMaster> ProjectMasters { get; set; }
}

   public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddEntityFrameworkProxies();
        services.AddDbContextPool<ApplicationDBContext>(options =>
        {
            options.UseSqlServer(Configuration.GetConnectionString("amcConn"));
            options.UseLazyLoadingProxies(true);
        });
        //services.AddDbContextPool<ApplicationDBContext>(options => options.UseSqlServer(Configuration.GetConnectionString("amcConn")));
       // services.AddDbContextPool<ApplicationDBContext>(options => options.UseLazyLoadingProxies().UseSqlServer(Configuration.GetConnectionString("amcConn")));


        services.AddSession();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

    }

public ApiResult<List<ProjectMaster>> getallProject()
    {
        try
        {
            AMCContext _contect = new AMCContext();
            return new ApiResult<List<ProjectMaster>>
            (new ApiResultCode(ApiResultType.Success), _contect.ProjectMasters.ToList());
        }

[表格（“ProjectMaster”）]
公共部分类ProjectMaster
{
[关键]
公共Guid项目ID{get；set；}
[必需]
[长度（500）]
公共字符串ProjectName{get；set；}
[必需]
[长度（500）]
公共字符串项目代码{get；set；}
公共Guid客户端ID{get；set；}
通过{get；set；}创建的公共Guid
公共虚拟客户端主机客户端主机{get；set；}
}
[表（“客户主机”）]
公共部分类ClientMaster
{
[System.Diagnostics.CodeAnalysis.SuppressMessage（“Microsoft.Usage”，“CA2214:DoNotCallOverridableMethodsInConstructors”）]
公共客户端主机（）
{
ProjectMasters=newhashset（）；
}
[关键]
公共Guid客户端ID{get；set；}
[必需]
[长度（100）]
公共字符串ClientName{get；set；}
通过{get；set；}创建的公共Guid
[System.Diagnostics.CodeAnalysis.SuppressMessage（“Microsoft.Usage”，“CA2227:CollectionPropertiesShouldBreadOnly”）]
公共虚拟ICollection ProjectMasters{get；set；}
}

启动：

[Table("ProjectMaster")]
public partial class ProjectMaster
{
    [Key]
    public Guid ProjectId { get; set; }

    [Required]
    [StringLength(500)]
    public string ProjectName { get; set; }

    [Required]
    [StringLength(500)]
    public string ProjectCode { get; set; }

    public Guid ClientId { get; set; }

    public Guid CreatedBy { get; set; }

    public virtual ClientMaster ClientMaster { get; set; }
}

[Table("ClientMaster")]
public partial class ClientMaster
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public ClientMaster()
    {
        ProjectMasters = new HashSet<ProjectMaster>();
    }

    [Key]
    public Guid ClientId { get; set; }

    [Required]
    [StringLength(100)]
    public string ClientName { get; set; }

    public Guid CreatedBy { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<ProjectMaster> ProjectMasters { get; set; }
}

   public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddEntityFrameworkProxies();
        services.AddDbContextPool<ApplicationDBContext>(options =>
        {
            options.UseSqlServer(Configuration.GetConnectionString("amcConn"));
            options.UseLazyLoadingProxies(true);
        });
        //services.AddDbContextPool<ApplicationDBContext>(options => options.UseSqlServer(Configuration.GetConnectionString("amcConn")));
       // services.AddDbContextPool<ApplicationDBContext>(options => options.UseLazyLoadingProxies().UseSqlServer(Configuration.GetConnectionString("amcConn")));


        services.AddSession();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

    }

public ApiResult<List<ProjectMaster>> getallProject()
    {
        try
        {
            AMCContext _contect = new AMCContext();
            return new ApiResult<List<ProjectMaster>>
            (new ApiResultCode(ApiResultType.Success), _contect.ProjectMasters.ToList());
        }

public void配置服务（IServiceCollection服务）
{
配置（选项=>
{
//此lambda确定给定请求是否需要非必要cookie的用户同意。
options.checkApprovered=context=>true；
options.MinimumSameSitePolicy=SameSiteMode.None；
});
服务。AddEntityFrameworkProxies（）；
services.AddDbContextPool（选项=>
{
options.UseSqlServer（Configuration.GetConnectionString（“amcConn”）；
选项。使用LazyLoadingProxies（true）；
});
//services.AddDbContextPool（options=>options.UseSqlServer（Configuration.GetConnectionString（“amcConn”））；
//services.AddDbContextPool（options=>options.UseLazyLoadingProxies（）.UseSqlServer（Configuration.GetConnectionString（“amcConn”））；
services.AddSession（）；
services.AddMvc（）.SetCompatibilityVersion（CompatibilityVersion.Version_2_2）；
}

控制器：

[Table("ProjectMaster")]
public partial class ProjectMaster
{
    [Key]
    public Guid ProjectId { get; set; }

    [Required]
    [StringLength(500)]
    public string ProjectName { get; set; }

    [Required]
    [StringLength(500)]
    public string ProjectCode { get; set; }

    public Guid ClientId { get; set; }

    public Guid CreatedBy { get; set; }

    public virtual ClientMaster ClientMaster { get; set; }
}

[Table("ClientMaster")]
public partial class ClientMaster
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public ClientMaster()
    {
        ProjectMasters = new HashSet<ProjectMaster>();
    }

    [Key]
    public Guid ClientId { get; set; }

    [Required]
    [StringLength(100)]
    public string ClientName { get; set; }

    public Guid CreatedBy { get; set; }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
    public virtual ICollection<ProjectMaster> ProjectMasters { get; set; }
}

   public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            // This lambda determines whether user consent for non-essential cookies is needed for a given request.
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddEntityFrameworkProxies();
        services.AddDbContextPool<ApplicationDBContext>(options =>
        {
            options.UseSqlServer(Configuration.GetConnectionString("amcConn"));
            options.UseLazyLoadingProxies(true);
        });
        //services.AddDbContextPool<ApplicationDBContext>(options => options.UseSqlServer(Configuration.GetConnectionString("amcConn")));
       // services.AddDbContextPool<ApplicationDBContext>(options => options.UseLazyLoadingProxies().UseSqlServer(Configuration.GetConnectionString("amcConn")));


        services.AddSession();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

    }

public ApiResult<List<ProjectMaster>> getallProject()
    {
        try
        {
            AMCContext _contect = new AMCContext();
            return new ApiResult<List<ProjectMaster>>
            (new ApiResultCode(ApiResultType.Success), _contect.ProjectMasters.ToList());
        }

public apireult getallProject（）
{
尝试
{
AMCContext_contect=新的AMCContext（）；
返回新结果
（新的ApiResultCode（ApiResultType.Success），\u contect.ProjectMasters.ToList（））；
}

这里是我迄今为止所做的所有努力

这里需要注意的一点是，这个实体存在于类库项目中，所有必要的包都已加载到其中

---

如果有，请给我一些有用的建议。

我当前使用的版本

<PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="2.2.4" />

样本实体

public class Post : BaseEntity
{
    public string Title { get; set; }
    public string ShortDescription { get; set; }
    public string Content { get; set; }
    public PostStatus PostStatus { get; set; }
    public int Views { get; set; }
    public virtual User User { get; set; }
    public virtual ICollection<Comment> Comments { get; set; }
    public virtual Media Medias { get; set; }
}

public class Comment : BaseEntity
{
    public string Content { get; set; }
    public virtual Comment ParentComment { get; set; }
    public virtual Post Post { get; set; }
    public virtual User? User { get; set; }
    public CommentStatus CommentStatus { get; set; }
}

当您使用延迟加载时，它会在您尝试访问时加载值 您可以使用foreach循环来实现此目的，如图所示 下面：

---

它将通过Include工作，但这将添加渴望加载的方法。我想通过延迟加载来实现这一点。我已经尝试了你建议的所有方法。嗯，另一件事我可以建议它删除obj并调试文件夹，然后清理。重新生成并运行你的项目。我已经尝试了你建议的方法，但也不起作用。我不明白为什么会这样t简单的一步是不会导致我。