具有实体框架的自动映射器，初始化错误 [英] Automapper with Entity Framework, Initialization Error

问题描述

我有一个使用Code First生成模型的EF6 MVC应用.我正在尝试使用AutoMapper在模型和该模型的视图模型表示之间创建映射.但是，当我执行映射时，会收到错误消息:

I have an EF6 MVC app using Code First to generate the models. I am trying to create a mapping using AutoMapper between the model and a view model representation of that model. However, when I do the mapping I receive the error:

映射器未初始化.调用适当的初始化 配置.如果您尝试通过 容器或其他方式，请确保您没有对的任何调用 静态Mapper.Map方法，如果您使用的是ProjectTo或 UseAsDataSource扩展方法，请确保您传入 适当的IConfigurationProvider实例.

Mapper not initialized. Call Initialize with appropriate configuration. If you are trying to use mapper instances through a container or otherwise, make sure you do not have any calls to the static Mapper.Map methods, and if you're using ProjectTo or UseAsDataSource extension methods, make sure you pass in the appropriate IConfigurationProvider instance.

我肯定是在初始化Mapper，但是我无法弄清为什么配置失败.在这种情况下，谁能提供一些帮助我成功使用AutoMapper的帮助?

I am definitely initializing the Mapper, but I am not able to figure out why the configuration is failing. Could anyone provide some assistance on what I can do to successfully use AutoMapper in this situation?

以下是我如何配置和初始化Mapper的代码:

Here is the code for how I am configuring and initializing the Mapper:

    var pTConnections = _db.PTConnections.Include(p => p.PTConnectionClass).ToList();

        Mapper.Initialize(cfg =>
        {
            cfg.CreateMap<PTConnection, PTConnectionViewModel>()
                .AfterMap((s, d) => { foreach (var i in d.PTCredentialAssignments) i.PTConnection = d; });

            cfg.CreateMap<PTCredentialAssignment, PTCredentialAssignmentViewModel>()
                .ForMember(m => m.PTCredential, opt => opt.Ignore())
                .ForMember(m => m.PTConnection, opt => opt.Ignore());

            cfg.CreateMap<PTVendor, PTVendorViewModel>()
                .ForMember(m => m.PTCredentials, opt => opt.Ignore())
                .ForMember(m => m.PTConnections, opt => opt.Ignore());

            cfg.CreateMap<PTCredential, PTCredentialViewModel>();

            cfg.CreateMap<PTConnectionClass, PTConnectionClassViewModel>()
                .ForMember(m => m.PTConnections, opt => opt.Ignore());

            cfg.CreateMap<PTConnectionContactAssignment, PTConnectionContactAssignmentViewModel>()
                .ForMember(m => m.PTConnection, opt => opt.Ignore());

        });

    var dest = Mapper.Map<List<PTConnection>, List<PTConnectionViewModel>>(pTConnections);

这是我的代码优先模型:

Here is my Code First Model:

public partial class PTConnection
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public PTConnection()
    {
        PTConnectionAssignments = new HashSet<PTConnectionAssignment>();
        PTCredentialAssignments = new HashSet<PTCredentialAssignment>();
        PTConnectionContactAssignments = new HashSet<PTConnectionContactAssignment>();
    }

    [Key]
    public int PTCID { get; set; }

    [Column(TypeName = "datetime2")]
    public DateTime ModifiedDate { get; set; }

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

    [Required]
    [StringLength(255)]
    public string ConnectionName { get; set; }

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

    public int Port { get; set; }

    public string Comment { get; set; }

    public int PTCCID { get; set; }

    public bool? IsDisabled { get; set; }

    public int PTVID { get; set; }

    public virtual PTConnectionClass PTConnectionClass { get; set; }

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

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

    public virtual PTVendor PTVendor { get; set; }

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

public partial class PTCredential
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public PTCredential()
    {
        PTCredentialAssignments = new HashSet<PTCredentialAssignment>();
        PTCredentialContactAssignments = new HashSet<PTCredentialContactAssignment>();
    }

    [Key]
    public int PTCRID { get; set; }

    [Column(TypeName = "datetime2")]
    public DateTime ModifiedDate { get; set; }

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

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

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

    public string Directory { get; set; }

    public bool? IsDisabled { get; set; }

    public string Comments { get; set; }

    public int? PTVID { get; set; }

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

    public virtual PTVendor PTVendor { get; set; }

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

public partial class PTVendor
{
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
    public PTVendor()
    {
        PTConnections = new HashSet<PTConnection>();
        PTCredentials = new HashSet<PTCredential>();
        PTIneligableCredentialVendorAssignments = new HashSet<PTIneligableCredentialVendorAssignment>();
        PTVendorAssignments = new HashSet<PTVendorAssignment>();
        PTVendorContactAssignments = new HashSet<PTVendorContactAssignment>();
    }

    [Key]
    public int PTVID { get; set; }

    [Column(TypeName = "datetime2")]
    public DateTime ModifiedDate { get; set; }

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

    [Required]
    [StringLength(50), Display(Name="Vendor Name")]
    public string Name { get; set; }

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

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

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

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

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

[Table("PTCredentialAssignment")]
public partial class PTCredentialAssignment
{
    [Key]
    public int PTCRAID { get; set; }

    [Column(TypeName = "datetime2")]
    public DateTime ModifiedDate { get; set; }

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

    public int PTCID { get; set; }

    public int PTCRID { get; set; }

    public virtual PTConnection PTConnection { get; set; }

    public virtual PTCredential PTCredential { get; set; }
}

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

    [Key]
    public int PTCCID { get; set; }

    [Column(TypeName = "datetime2")]
    public DateTime ModifiedDate { get; set; }

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

    [Required]
    [StringLength(50)]
    public string Class { get; set; }

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

[Table("PTConnectionContactAssignment")]
public partial class PTConnectionContactAssignment
{
    [Key]
    public int PTCCAID { get; set; }

    [Column(TypeName = "datetime2")]
    public DateTime ModifiedDate { get; set; }

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

    public int PTCID { get; set; }

    [Required]
    [StringLength(60)]
    public string FirstName { get; set; }

    [Required]
    [StringLength(60)]
    public string LastName { get; set; }

    [Required]
    [StringLength(10)]
    public string PhoneNumber { get; set; }

    [StringLength(20)]
    public string Extension { get; set; }

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

    [StringLength(60)]
    public string Title { get; set; }

    public string Comment { get; set; }

    public virtual PTConnection PTConnection { get; set; }
}

这是我的ViewModel:

Here is my ViewModel:

   public partial class PTConnectionViewModel
    {
        [Key]
        public int PTCID { get; set; }

        [Column(TypeName = "datetime2")]
        public DateTime ModifiedDate { get; set; }

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

        [Required]
        [StringLength(255)]
        public string ConnectionName { get; set; }

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

        public int Port { get; set; }

        public string Comment { get; set; }

        public int PTCCID { get; set; }

        public bool? IsDisabled { get; set; }

        public int PTVID { get; set; }

        public virtual PTConnectionClassViewModel PTConnectionClass { get; set; }

        public virtual ICollection<PTConnectionAssignmentViewModel> PTConnectionAssignments { get; set; }

        public virtual ICollection<PTCredentialAssignmentViewModel> PTCredentialAssignments { get; set; }

        public virtual PTVendorViewModel PTVendor { get; set; }

        public virtual ICollection<PTConnectionContactAssignmentViewModel> PTConnectionContactAssignments { get; set; }
    }

public partial class PTVendorViewModel
{
    [Key]
    public int PTVID { get; set; }

    [Column(TypeName = "datetime2")]
    public DateTime ModifiedDate { get; set; }

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

    [Required]
    [StringLength(50), Display(Name="Vendor Name")]
    public string Name { get; set; }

    public virtual ICollection<PTConnectionViewModel> PTConnections { get; set; }

    public virtual ICollection<PTCredentialViewModel> PTCredentials { get; set; }

}

public partial class PTCredentialViewModel
{
    [Key]
    public int PTCRID { get; set; }

    [Column(TypeName = "datetime2")]
    public DateTime ModifiedDate { get; set; }

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

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

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

    public string Directory { get; set; }

    public bool? IsDisabled { get; set; }

    public string Comments { get; set; }

    public int? PTVID { get; set; }

    public virtual ICollection<PTCredentialAssignmentViewModel> PTCredentialAssignments { get; set; }

    public virtual PTVendorViewModel PTVendor { get; set; }

    public virtual ICollection<PTCredentialContactAssignmentViewModel> PTCredentialContactAssignments { get; set; }
}

public partial class PTCredentialAssignmentViewModel
{
    [Key]
    public int PTCRAID { get; set; }

    [Column(TypeName = "datetime2")]
    public DateTime ModifiedDate { get; set; }

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

    public int PTCID { get; set; }

    public int PTCRID { get; set; }

    public virtual PTConnectionViewModel PTConnection { get; set; }

    public virtual PTCredentialViewModel PTCredential { get; set; }
}

public partial class PTConnectionClassViewModel
{

    [Key]
    public int PTCCID { get; set; }

    [Column(TypeName = "datetime2")]
    public DateTime ModifiedDate { get; set; }

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

    [Required]
    [StringLength(50)]
    public string Class { get; set; }

    public virtual ICollection<PTConnectionViewModel> PTConnections { get; set; }
}

public partial class PTConnectionContactAssignmentViewModel
{
    [Key]
    public int PTCCAID { get; set; }

    [Column(TypeName = "datetime2")]
    public DateTime ModifiedDate { get; set; }

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

    public int PTCID { get; set; }

    [Required]
    [StringLength(60)]
    public string FirstName { get; set; }

    [Required]
    [StringLength(60)]
    public string LastName { get; set; }

    [Required]
    [StringLength(10)]
    public string PhoneNumber { get; set; }

    [StringLength(20)]
    public string Extension { get; set; }

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

    [StringLength(60)]
    public string Title { get; set; }

    public string Comment { get; set; }

    public virtual PTConnectionViewModel PTConnection { get; set; }
}

推荐答案

只需将地图从一种类型创建为另一种即可.不要将地图从一种类型的列表创建为另一种类型的列表. Automapper可以自动处理集合.

Just create the map from one type to another. Don't create the map from a List of one type to a list of another type. Automapper can automatically handle collections.

实际上，您是在告诉Automapper如何将List<A>映射到List<B>，而没有告诉Automapper如何将A实际映射到B.将您的注册更改为以下内容:

In effect, you're telling Automapper how to map a List<A> to a List<B> without telling Automapper how to actually map A to B. Change your registration to the following:

Mapper.Initialize(cfg => 
{
    cfg.CreateMap<PTConnection, PTConnectionViewModel>();
});

您仍然可以将List<PTConnection>以及大多数其他集合类型映射到List<PTConnectionViewModel>.

You can still map a List<PTConnection> to a List<PTConnectionViewModel> just fine, as well as most other collection types.

这篇关于具有实体框架的自动映射器，初始化错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！