Question

当我运行代码行Mapper.Map（Account，User）;我收到“缺少类型映射配置或不支持的映射”异常。我还要注意Mapper.Map（Account）行;不抛出异常并返回预期结果。我想要做的是将值从Account移动到User而不创建User的新实例。任何帮助都会很棒。谢谢！

public class AccountUpdate
{
    [Email]
    [Required]
    public string Email { get; set; }

    [Required]
    [StringLength(25, MinimumLength = 3, ErrorMessage = "Your name must be between 3 and 25 characters")]
    public string Name { get; set; }

    public string Roles { get; set; }
}

public class User
{
    public User()
    {
        Roles = new List<Role>();
    }
    public int UserId { get; set; }
    public string Email { get; set; }
    public string Name { get; set; }
    public byte[] Password { get; set; }
    public byte[] Salt { get; set; }
    public DateTime CreatedOn { get; set; }
    public DateTime LastLogin { get; set; }
    public virtual ICollection<Role> Roles { get; set; }
}


Mapper.CreateMap<AccountUpdate, User>().ForMember(d => d.Roles, s => s.Ignore());

Answer 1

您没有映射目标类的所有成员。

致电Mapper.AssertConfigurationIsValid();了解有关问题的详细信息：

Unmapped members were found. Review the types and members below.
Add a custom mapping expression, ignore, add a custom resolver, or modify the source/destination type
==============================================================
AccountUpdate -> User (Destination member list)
ConsoleApplication1.AccountUpdate -> ConsoleApplication1.User (Destination member list)
--------------------------------------------------------------
UserId
Password
Salt
CreatedOn
LastLogin

要解决此问题，请明确忽略未映射的成员。

我刚试过这个：

Mapper.CreateMap<AccountUpdate, User>()
        .ForMember(d => d.Roles, s => s.Ignore())
        .ForMember(d => d.UserId, s => s.Ignore())
        .ForMember(d => d.Password, s => s.Ignore())
        .ForMember(d => d.Salt, s => s.Ignore())
        .ForMember(d => d.CreatedOn, s => s.Ignore())
        .ForMember(d => d.LastLogin, s => s.Ignore());

Mapper.AssertConfigurationIsValid();

var update = new AccountUpdate
{
    Email = "foo@bar.com",
    Name = "The name",
    Roles = "not important"
};

var user = Mapper.Map<AccountUpdate, User>(update);

Trace.Assert(user.Email == update.Email);
Trace.Assert(user.Name == update.Name);

这也有效：

var user = new User();
Mapper.Map(update, user);

Trace.Assert(user.Email == update.Email);
Trace.Assert(user.Name == update.Name);

Answer 2

项目中记录的问题概述了一个潜在的解决方案，即使用源对象作为映射，而不是目标。 original thread is here以及相关的代码示例为：

debug.apk

在链接问题中还有一个更通用的扩展方法，也可能有助于节省时间。

AutoMapper异常

2 个答案: