c# – AutoMapperMappingException – 缺少类型映射配置或不支持

发布时间：2020-12-15 08:15:00 所属栏目：百科来源：网络整理

导读：当我在我的代码中实现IReadOnlyList时,我的单元测试抛出了AutoMapperMappingException. 从挖掘文章和文档,我的猜测是AutoMapper需要对只读类型进行特殊编码.这会是什么样的？注意：我尝试了Mapper.AssertConfigurationIsValid();正如另一篇文章所建议,但没

当我在我的代码中实现IReadOnlyList时,我的单元测试抛出了AutoMapperMappingException.

从挖掘文章和文档,我的猜测是AutoMapper需要对只读类型进行特殊编码.这会是什么样的？

注意：我尝试了Mapper.AssertConfigurationIsValid();正如另一篇文章所建议,但没有任何改进

Test Name: CreateOrder_ValidContract_CreatesNewOrder Test
FullName: ACME.Maintenance.Domain.Test.OrderServiceTest.CreateOrder_ValidContract_CreatesNewOrder
Test Source: C:Usersmedocumentsvisual studio
2015ProjectsACME.MaintenanceACME.Maintenance.Domain.TestOrderServiceTest.cs
: line 65 Test Outcome: Failed Test Duration: 0:00:00.0233941

Result StackTrace: at lambda_method(Closure,ContractDto,Contract
,ResolutionContext ) at
ACME.Maintenance.Domain.ContractService.GetById(String contractId) in
C:Usersmedocumentsvisual studio
2015ProjectsACME.MaintenanceACME.Maintenance.DomainContractService.cs:line
34 at
ACME.Maintenance.Domain.Test.OrderServiceTest.CreateOrder_ValidContract_CreatesNewOrder()
in C:Usersmedocumentsvisual studio
2015ProjectsACME.MaintenanceACME.Maintenance.Domain.TestOrderServiceTest.cs:line
69 Result Message: Test method
ACME.Maintenance.Domain.Test.OrderServiceTest.CreateOrder_ValidContract_CreatesNewOrder
threw exception: AutoMapper.AutoMapperMappingException: Missing type
map configuration or unsupported mapping.

Mapping types: ContractDto -> Contract

ACME.Maintenance.Domain.DTO.ContractDto -> ACME.Maintenance.Domain.Contract

Mapper.Initialize(cfg => cfg.CreateMap<ContractDto,Contract>());
Mapper.Initialize(cfg => cfg.CreateMap<PartDto,Part>());
[TestMethod]
public void CreateOrder_ValidContract_CreatesNewOrder()
    {
        //Arrange
        var orderService = new OrderService();
        var contractService = new ContractService(_contractRepository);
        var contract = contractService.GetById(ValidContractId);

        // Act
        var newOrder = orderService.CreateOrder(contract);

        // Assert
        Assert.IsInstanceOfType(newOrder,typeof(Order));

        Guid guidOut;
        Assert.IsTrue(Guid.TryParse(newOrder.OrderId,out guidOut));

        Assert.AreEqual(newOrder.Status,ContractStatus.New);
        Assert.IsInstanceOfType(newOrder.Items,typeof(IReadOnlyList<OrderItem>));

    }

ContractService类：

public Contract GetById(string contractId)
    {
        var contractDto = _contractRepository.GetById(contractId);
        var contract = Mapper.Map<ContractDto,Contract>(contractDto);
        Mapper.AssertConfigurationIsValid();
        return contract;
    }

合同类：

public class Contract
{
    public string ContractId { get; set; }
    public DateTime ExpirationDate { get; set; }

}

ContractDto类：

public class ContractDto
{
    public string ContractId { get; set; }
    public DateTime ExpirationDate { get; set; }

}

解决方法

你的问题是你多次调用Mapping.Initialize：它不是附加的,所以你要覆盖以前的映射,这就是你将地图从ContractDto丢失到Contract的原因

因此,在测试的Setup方法中,您应该像这样调用它：

Mapper.Initialize(cfg => {
     cfg.CreateMap<ContractDto,Contract>();
     cfg.CreateMap<PartDto,Part>();
});

（编辑：李大同）

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