使用 Web API 设置 Unity

1.将 Unity 添加到项目中

如果你使用 NuGet， 你可以使用 Unity-package 。在程序包管理器控制台中运行 Install-Package Unity。这将为你的项目添加 Unity 库（及其依赖项）。

2.创建 IDependencyResolver 的实现

例如：

public class UnityResolver : IDependencyResolver
{
    protected IUnityContainer Container;

    public UnityResolver(IUnityContainer container)
    {
        if (container == null)
        {
            throw new ArgumentNullException("container");
        }
        this.Container = container;
    }

    public object GetService(Type serviceType)
    {
        try
        {
            return Container.Resolve(serviceType);
        }
        catch (ResolutionFailedException)
        {
            return null;
        }
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        try
        {
            return Container.ResolveAll(serviceType);
        }
        catch (ResolutionFailedException)
        {
            return new List<object>();
        }
    }

    public IDependencyScope BeginScope()
    {
        var child = Container.CreateChildContainer();
        return new UnityResolver(child);
    }

    public void Dispose()
    {
        Container.Dispose();
    }
}

3.在你的 WebApiConfig 中注册你的 IDependencyResolver

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Routes goes here..

        // Create your container.
        var container = new UnityContainer();

        // Do registrations here...

        // Assign your container.
        config.DependencyResolver = new UnityResolver(container);
    }
}