具有实体框架的自动映射器,初始化错误

Question

我有一个使用Code First的EF6 MVC应用程序来生成模型.我试图在模型和该模型的视图模型表示之间使用AutoMapper创建映射.但是,当我执行映射时,我收到错误:

Mapper未初始化.使用适当的配置调用Initialize.如果您正试图通过容器或以其它方式使用映射器实例,请确保您不必静态Mapper.Map方法的任何电话,如果你使用ProjectTo或UseAsDataSource扩展方法,确保你在适当的IConfigurationProvider通实例.

我肯定是在初始化Mapper,但我无法弄清楚配置失败的原因.在这种情况下,有没有人可以帮助我成功使用AutoMapper？

以下是我如何配置和初始化Mapper的代码:

    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Code First模型:

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:

   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; }
}

Answer 1

只需从一种类型到另一种类型创建地图.不要将映射从一种类型的列表创建到另一种类型的列表.Automapper可以自动处理集合.

实际上,您告诉Automapper如何将a 映射List<A>到a List<B>而不告诉Automapper如何实际映射A到B.将您的注册更改为以下内容:

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

您仍然可以将a映射List<PTConnection>到一个List<PTConnectionViewModel>很好的,以及大多数其他集合类型.