MVC 6 Controller 中的 ControllerContext 和 ViewEngines 属性在哪里?

问题描述

我创建了一个新的 MVC6 项目并构建了一个新站点.目标是获得视图的渲染结果.我找到了以下代码，但我无法让它工作，因为我找不到 ControllerContext 和 ViewEngines.

I've created a new MVC6 project and building a new site. The goal is to get the rendered result of a view. I found the following code, but I can't get it to work because I can't find the ControllerContext and the ViewEngines.

这是我要重写的代码:

protected string RenderPartialViewToString(string viewName, object model)
{
    if (string.IsNullOrEmpty(viewName))
        viewName = ControllerContext.RouteData.GetRequiredString("action");

    ViewData.Model = model;

    using (StringWriter sw = new StringWriter())
    {
        ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(ControllerContext, viewName);
        ViewContext viewContext = new ViewContext(ControllerContext, viewResult.View, ViewData, TempData, sw);
        viewResult.View.Render(viewContext, sw);

        return sw.GetStringBuilder().ToString();
    }
}

推荐答案

首先，我们可以利用 ASP.Net MVC Core 附带的内置依赖注入，这将为我们提供手动渲染视图所需的 ICompositeViewEngine 对象.例如，一个控制器看起来像这样:

First of all we can leverage the built in dependency injection that comes with ASP.Net MVC Core which will give us the ICompositeViewEngine object we need to render our views manually. So for example, a controller would look like this:

public class MyController : Controller
{
    private ICompositeViewEngine _viewEngine;

    public MyController(ICompositeViewEngine viewEngine)
    {
        _viewEngine = viewEngine;
    }

    //Rest of the controller code here
}

接下来，我们实际需要渲染视图的代码.请注意，它现在是一个 async 方法，因为我们将在内部进行异步调用:

Next, the code we actually need to render a view. Note that is is now an async method as we will be making asynchronous calls internally:

private async Task<string> RenderPartialViewToString(string viewName, object model)
{
    if (string.IsNullOrEmpty(viewName))
        viewName = ControllerContext.ActionDescriptor.ActionName;

    ViewData.Model = model;

    using (var writer = new StringWriter())
    {
        ViewEngineResult viewResult = 
            _viewEngine.FindView(ControllerContext, viewName, false);

        ViewContext viewContext = new ViewContext(
            ControllerContext, 
            viewResult.View, 
            ViewData, 
            TempData, 
            writer, 
            new HtmlHelperOptions()
        );

        await viewResult.View.RenderAsync(viewContext);

        return writer.GetStringBuilder().ToString();
    }
}

要调用方法，就这么简单:

And to call the method, it's as simple as this:

public async Task<IActionResult> Index()
{
    var model = new TestModel
    {
        SomeProperty = "whatever"
    }

    var renderedView = await RenderPartialViewToString("NameOfView", model);

    //Do what you want with the renderedView here

    return View();
}

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