c# - 简单注入(inject)器 - 自定义 WebViewPage

Question

我有一个使用翻译的小应用程序(目前)。我的翻译服务叫做翻译器(ITranslator)。

我的问题是我不想在每个 Controller (它返回一个 View )中检索这个类，所以我可以在我的 View 中使用它。

我在 ListService(我存储所有 SelectListItem 列表的地方)也有类似的问题。

CustomWebViewPage

public abstract class CustomViewPage<TModel> : WebViewPage<TModel>
{
    readonly IScriptFactory scriptFactory;
    readonly IMembership membership;
    readonly IListService listService;
    readonly ITranslator translator;

    IHtmlString path;

    public IMembership Membership { get { return this.membership; } }
    public override IPrincipal User { get { return this.membership.User; } }
    public IListService Lists { get { return this.listService; } }
    public ITranslator Translator { get { return this.translator; } }

    public CustomViewPage(IScriptFactory scriptFactory, IMembership membership,
        IListService listService, ITranslator translator)
    {
        this.scriptFactory = scriptFactory;
        this.membership = membership;
        this.listService = listService;
        this.translator = translator;
    }

    public IHtmlString OwnScriptsPath
    {
        get { return path ?? (path = scriptFactory.Create(this.Html).ToHtmlString()); }
    }

    private string languageHtml =
        "<meta name=\"language\" content=\"" + membership.CurrentLanguage + "\">";
    public IHtmlString MetaLanguage { get { return MvcHtmlString.Create(languageHtml); } }
}

和用法:

<div>
   @Lists.GetNationalities(Model.NationalityId)
</div>

但是，在运行应用程序时出现以下错误:

'[NAMESPACE].CustomViewPage' does not contain a constructor that takes 0 arguments

但是如果我创建第二个构造函数，Simple-Injector 将抛出错误，因为它不支持多个构造函数。

我怎样才能达到我想要的，或者不可能？

编辑

完整的堆栈跟踪

c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\vs\520dfaa2\f5e4578c\App_Web_index.cshtml.a8d08dba.jtlk7fxz.0.cs(40): error CS1729: 'SportsHub.SDK.Infrastructure.CustomViewPage' does not contain a constructor that takes 0 arguments

at System.Web.Compilation.AssemblyBuilder.Compile()
at System.Web.Compilation.BuildProvidersCompiler.PerformBuild()
at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath)
at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate)
at System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean throwIfNotFound)    at System.Web.Compilation.BuildManager.GetCompiledType(VirtualPath virtualPath)
at System.Web.Compilation.BuildManager.GetCompiledType(String virtualPath)
at System.Web.Mvc.BuildManagerWrapper.System.Web.Mvc.IBuildManager.GetCompiledType(String virtualPath)
at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer)
at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult)
at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<>c__DisplayClass2b.<BeginInvokeAction>b__1c()
at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult)

编辑2

正如@StriplingWarrior 和@Steven 所建议的，我使用了属性注入(inject)，但它似乎不适用于 WebViewPage

我在服务上对其进行了测试，属性注入(inject)成功，但在此类中，该属性为 null。

PS:我使用 get;set; 公开了这些属性

新建 View 页面:

public abstract class CustomViewPage<TModel> : WebViewPage<TModel>
{
    [Inject]
    public IScriptFactory scriptFactory { get; set; }
    [Inject]
    public IMembership membership { get; set; }
    [Inject]
    public IListService listService { get; set; }
    [Inject]
    public ITranslator translator { get; set; }

    IHtmlString scriptsPath;
    public IHtmlString OwnScriptsPath()
    {
        if (scriptsPath == null)
        {
            scriptsPath = scriptFactory.Create(this.Html).ToHtmlString();
        }
        return scriptsPath;
    }

    /// <summary>
    /// Renders the current user language with a meta tag
    /// </summary>
    public IHtmlString MetaLanguage()
    {
        return MvcHtmlString.Create("<meta name=\"language\" content=\"" + membership.CurrentLanguage + "\">");
    }

对于 InjectAttribute，我遵循了以下 documents .

Answer 1

你必须使用像this 这样的注册依赖容器。 .这样，当 ASP.NET 调用 SimpleInject 来解决依赖关系时，您可以指定所有接口(interface)以及匹配的实现是什么。

你也可以像这样创建一个无参数的构造函数:

public CustomViewPage() : base(new ScriptFactory(), new Membership()...) { }

但我不建议...让这种依赖关系解析逻辑正常工作是最好的事情。