简单注入器中 HttpConfiguration 的依赖注入

Question

我的HelpController中出现错误：

帮助控制器类型的构造函数包含参数 名称"config"并键入未注册的 HttpConfiguration。 请确保已注册 HttpConfiguration，或更改 帮助控制器的构造函数。

有没有其他方法可以解决此问题，因为我使用Configuration来获取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 并放回 VS 生成的无参数构造函数中。您的HelpController应如下所示。

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; }
}