简单注射器中HttpConfiguration的依赖注入

Question

我的HelpController中有一个错误：

类型HelpController的构造函数包含名称为“config”的参数和未注册的HttpConfiguration类型。请确保HttpConfiguration已注册，或更改HelpController的构造函数。

有什么办法可以解决这个问题吗?因为我使用Configuration获取Configuration.GetModelDescriptionGenerator();。

public class HelpController : Controller
{
    private const string ErrorViewName = "Error";

    public HelpController(HttpConfiguration config)
    {
        Configuration = config;
    }

    public HttpConfiguration Configuration { get; private set; }

    ...

    public ActionResult ResourceModel(string modelName)
    {
        if (!String.IsNullOrEmpty(modelName))
        {
            ModelDescriptionGenerator modelDescriptionGenerator = Configuration.GetModelDescriptionGenerator();
            ModelDescription modelDescription;
            if (modelDescriptionGenerator.GeneratedModels.TryGetValue(modelName, out modelDescription))
            {
                return View(modelDescription);
            }
        }

        return View(ErrorViewName);
    }
}

Answer 1

将构造函数更改为private，并返回VS生成的无参数构造函数。你的HelpController应该是这样的。

public class HelpController : Controller
{
    private const string ErrorViewName = "Error";

    public HelpController()
        : this(GlobalConfiguration.Configuration)
    {
    }

    private HelpController(HttpConfiguration config)
    {
        Configuration = config;
    }


    public HttpConfiguration Configuration { get; private set; }
}