Question

如何使用automapper在我的模型类中映射ICollection属性。

以下是示例：

 Mapper.CreateMap<Planiranje.Planning.Data.User, Model.Users>()
                .ForMember(dst => dst.UserId, opts => opts.MapFrom(src => src.UserId))
                .ForMember(dst => dst.Username, opts => opts.MapFrom(src => src.Username))
                .ForMember(dst => dst.Firstname, opts => opts.MapFrom(src => src.Firstname))
                .ForMember(dst => dst.Lastname, opts => opts.MapFrom(src => src.Lastname))
                .ForMember(dst => dst.Email, opts => opts.MapFrom(src => src.Email))
                .ForMember(dst => dst.Segment, opts => opts.MapFrom(src => src.Segment))
                .ForMember(dst => dst.Groups, opts => opts.MapFrom(src => src.Groups));

其中，群组属于ICollection类型。

通过此映射，我收到以下错误

The following property on System.Text.RegularExpressions.Group cannot be mapped: 
    Groups
Add a custom mapping expression, ignore, add a custom resolver, or modify the destination type System.Text.RegularExpressions.Group.
Context:
    Mapping to property Groups from Planiranje.Planning.Data.Group to System.Text.RegularExpressions.Group
    Mapping to property Groups from System.Collections.Generic.ICollection`1[[Planiranje.Planning.Data.Group, Planiranje, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]] to System.Collections.Generic.ICollection`1[[System.Text.RegularExpressions.Group, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]
    Mapping from type Planiranje.Planning.Data.User to Planiranje.Model.Users
Exception of type 'AutoMapper.AutoMapperConfigurationException' was thrown.

在我摆脱Syste.Text.RegularExpression后，我收到以下错误消息

The following property on Planiranje.Model.Groups cannot be mapped: 
    Groups
Add a custom mapping expression, ignore, add a custom resolver, or modify the destination type Planiranje.Model.Groups.
Context:
    Mapping to property Groups from Planiranje.Planning.Data.Group to Planiranje.Model.Groups
    Mapping to property Groups from System.Collections.Generic.ICollection`1[[Planiranje.Planning.Data.Group, Planiranje, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]] to System.Collections.Generic.ICollection`1[[Planiranje.Model.Groups, Planiranje, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]
    Mapping from type Planiranje.Planning.Data.User to Planiranje.Model.Users
Exception of type 'AutoMapper.AutoMapperConfigurationException' was thrown.

此外，这是我的源/目标类来源类

namespace Planiranje.Planning.Data
{
    using System;
    using System.Collections.Generic;

    public partial class User
    {
        public User()
        {
            this.Groups = new HashSet<Group>();
        }

        public int UserId { get; set; }
        public string Username { get; set; }
        public string Firstname { get; set; }
        public string Lastname { get; set; }
        public string Email { get; set; }
        public string Segment { get; set; }

        public virtual ICollection<Group> Groups { get; set; }
    }
}

namespace Planiranje.Planning.Data
{
    using System;
    using System.Collections.Generic;

    public partial class Group
    {
        public Group()
        {
            this.Users = new HashSet<User>();
        }

        public int GroupId { get; set; }
        public string GroupName { get; set; }

        public virtual ICollection<User> Users { get; set; }
    }
}

和目的地类：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Diagnostics;

namespace Planiranje.Model
{
    public class Users : ModelBase,IEntity
    {
        private int _userId;
        public int UserId 
        {
            get
            {
                return _userId;
            }
            set
            {
                _userId = value;
                RaisePropertyChanged("UserId");
            }
        }
        private string _username;
        public string Username 
        {
            get
            {
                return _username;
            }
            set
            {
                _username = value;
                RaisePropertyChanged("Username");
            }
        }
        private string _firstname;
        public string Firstname
        {
            get
            {
                return _firstname;
            }
            set
            {
                _firstname = value;
                RaisePropertyChanged("Firstname");
            }
        }
        private string _lastname;
        public string Lastname 
        {
            get
            {
                return _lastname;
            }
            set
            {
                _lastname = value;
                RaisePropertyChanged("Lastname");
            }
        }
        private string _email;
        public string Email
        {
            get
            {
                return _email;
            }
            set
            {
                _email = value;
                RaisePropertyChanged("Email");
            }
        }
        private string _segment;
        public string Segment 
        {
            get
            {
                return _segment;
            }
            set
            {
                _segment = value;
                RaisePropertyChanged("Segment");
            }

        }

        private IList<Groups> _groups;
        public virtual IList<Groups> Groups
        {
            get
            {
                return _groups;
            }
            set
            {
                _groups = value;
                RaisePropertyChanged("Groups");
            }
        }

        public ModelEntityState ModelEntityState { get; set;}

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Diagnostics;

namespace Planiranje.Model
{
    public class Groups :ModelBase, IEntity
    {
        private int _groupId;
        public int GroupId 
        {
            get
            {
                return _groupId;
            }
            set
            {
                _groupId = value;
                RaisePropertyChanged("UserId");
            }
        }
        private string _groupname;
        public string GroupName 
        {
            get
            {
                return _groupname;
            }
            set
            {
                _groupname = value;
                RaisePropertyChanged("GroupName");
            }
        }

        private ICollection<Users> _users;
        public virtual ICollection<Users> Users 
        {
            get
            {
                return _users;
            }
            set
            {
                _users = value;
                RaisePropertyChanged("Users");
            }
        }

        public ModelEntityState ModelEntityState { get; set; }
    }
}

Answer 1

AutoMapper会很好地映射ICollection组。那不是你的问题。异常描述的问题是：

您的源属性组属于类型 Planiranje.Planning.Data.Group
但是你的目的地物业集团属于System.Text.RegularExpressions.Group

我猜目标属性类型是错误的。

我想您的文件Model.Users.cs顶部有一个using System.Text.RegularExpressions。

如果是这样，您最好的解决方法可能是添加

using Group=Planiranje.Planning.Data.Group;

到Model.Users.cs

的顶部

Answer 2

我认为问题在于你的映射

Mapper.CreateMap<Planiranje.Planning.Data.User, Model.Users>()

您还必须定义映射

Mapper.CreateMap<Planiranje.Planning.Data.Group,Planiranje.Model.Groups>()

你必须以递归的方式为所有你的类所依赖的类型继续这样做。

我看到当有完整的类系列时，AutoMapper配置会变得非常大。

如何使用AutoMapper映射ManytoMany关系

2 个答案: