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中的结构图ASP.NET核心未按预期处理原语

structuremap dependency-injection asp.net-core c#

Tom Troughton · 技术社区 · 6 年前

我有一个演示,用于演示中的各种DI生命周期ASP.NET核心。看起来像这样:

public interface IOperation
{
    Guid OperationId { get; }
}

public interface IOperationTransient : IOperation { }
public interface IOperationScoped : IOperation { }
public interface IOperationSingleton : IOperation { }
public interface IOperationInstance : IOperation { }

public class Operation : IOperationTransient, IOperationScoped,
    IOperationSingleton, IOperationInstance
{
    private Guid _guid;

    public Operation(Guid? value = null)
    {
        _guid = value == null ? Guid.NewGuid() : value.Value;
    }

    public Guid OperationId => _guid;
}

演示使用Web API控制器来显示DI生命周期之间的差异:

[Route("api/[controller]")]
public class ValuesController : Controller
{
    private readonly IOperationTransient _transientOperation;
    private readonly IOperationTransient _transientOperation2;
    private readonly IOperationScoped _scopedOperation;
    private readonly IOperationScoped _scopedOperation2;
    private readonly IOperationSingleton _singletonOperation;
    private readonly IOperationInstance _instanceOperation;

    public ValuesController(
        IOperationTransient transientOperation, IOperationTransient transientOperation2,
        IOperationScoped scopedOperation, IOperationScoped scopedOperation2,
        IOperationSingleton singletonOperation, IOperationInstance instanceOperation)
    {
        _transientOperation = transientOperation;
        _transientOperation2 = transientOperation2;
        _scopedOperation = scopedOperation;
        _scopedOperation2 = scopedOperation2;
        _singletonOperation = singletonOperation;
        _instanceOperation = instanceOperation;
    }

    [HttpGet]
    public Dictionary<string, IOperation> Get() =>
        new Dictionary<string, IOperation> {
            { "Transient", _transientOperation },
            { "Transient2", _transientOperation2 },
            { "Scoped", _scopedOperation },
            { "Scoped2", _scopedOperation2 },
            { "Singleton", _singletonOperation },
            { "Instance", _instanceOperation }
        };
}

services.AddTransient<IOperationTransient, Operation>();
services.AddScoped<IOperationScoped, Operation>();
services.AddSingleton<IOperationSingleton, Operation>();
services.AddSingleton<IOperationInstance>(new Operation(Guid.Empty));

这将显示JSON,它在每次刷新时为两个临时实现显示不同的GUID,为刷新时更改的两个作用域实现中的每一个显示相同的值,为刷新时不更改的singleton显示相同的值,并且实例注册始终是空的GUID。

我想用 StructureMap's ASP.NET Core implementation described here .

registry.For<IOperationTransient>().Use<Operation>().AlwaysUnique();
registry.For<IOperationScoped>().Use<Operation>().ContainerScoped();
registry.For<IOperationSingleton>().Use<Operation>().Singleton();
registry.For<IOperationInstance>().Use(new Operation(Guid.Empty));

但现在当我运行应用程序时,我看到以下服务器异常:

ArgumentException:GUID的字节数组的长度必须正好为16个字节。参数名称:b
System.Guid..ctor(Byte[] b)
lambda_method(Closure , IBuildSession , IContext )
StructureMapBuildException:生成类型时出错系统.Guid

我试着从使用 Guid? 到a string 为了我的 OperationId 属性并再次运行它。这次我得到了以下例外:

StructureMapBuildPlanException:无法为创建生成计划混凝土类型内置演示。操作

new Operation(String value)String value=必需的原语未显式定义依赖关系

2.)容器.GetInstance(BuiltinDIDemo.IOperationTransient) 3.)容器.TryGetInstance(BuiltinDIDemo.IOperationTransient)
StructureMap.Pipeline.ConstructorInstance.ToBuilder(Type pluginType, Policies policies)

Nullable<Guid> 的和原语使用默认值?

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