使用您自己的视图引擎

Question

我的项目中有母版页，其中包含有关网站版权的一些信息以及其中的一些联系信息。我想将它从母版页中取出并放在静态文件中（出于某种原因，这些文件必须放在〜/ Content文件夹中）。有没有一种方法可以在我看来像

<% Html.Include("~/Content/snippet.html") %>   // not a real code

Answer 1

最好使用部分视图（即使它只包含静态文本）并将其包含在Html.Partial帮助器中。但如果你坚持：

<%= File.ReadAllText(Server.MapPath("~/Content/snippet.html")) %>

Answer 2

如果您在.Net MVC 5中，并希望在不使用Razor渲染它的情况下包含HTML文件的部分文件：

@Html.Raw(File.ReadAllText(Server.MapPath("~/Views/Shared/ICanHaz.html")))

Answer 3

使用您自己的视图引擎

使用

@Html.Partial("_CommonHtmlHead")

作为

/Views/Shared/_CommonHtmlHead.html

或

/Views/MyArea/Shared/_CommonHtmlHead.htm

对我来说是最好的。

使用System.Web.Mvc.VirtualPathProviderViewEngine升序类为此创建自己的视图引擎似乎相对容易：

/// <summary>
/// Simple render engine to load static HTML files, supposing that view files has the html/htm extension, supporting replacing tilda paths (~/MyRelativePath) in the content
/// </summary>
public class HtmlStaticViewEngine : VirtualPathProviderViewEngine
{
    private static readonly ILog _log = LogManager.GetLogger(typeof (HtmlStaticViewEngine));

    protected readonly DateTime? AbsoluteTimeout;
    protected readonly TimeSpan? SlidingTimeout;
    protected readonly CacheItemPriority? Priority;

    private readonly bool _useCache;

    public HtmlStaticViewEngine(TimeSpan? slidingTimeout = null, DateTime? absoluteTimeout = null, CacheItemPriority? priority = null)
    {
        _useCache = absoluteTimeout.HasValue || slidingTimeout.HasValue || priority.HasValue;

        SlidingTimeout = slidingTimeout;
        AbsoluteTimeout = absoluteTimeout;
        Priority = priority;

        AreaViewLocationFormats = new[]
        {
            "~/Areas/{2}/Views/{1}/{0}.html",
            "~/Areas/{2}/Views/{1}/{0}.htm",
            "~/Areas/{2}/Views/Shared/{0}.html",
            "~/Areas/{2}/Views/Shared/{0}.htm"
        };
        AreaMasterLocationFormats = new[]
        {
            "~/Areas/{2}/Views/{1}/{0}.html",
            "~/Areas/{2}/Views/{1}/{0}.htm",
            "~/Areas/{2}/Views/Shared/{0}.html",
            "~/Areas/{2}/Views/Shared/{0}.htm"
        };
        AreaPartialViewLocationFormats = new[]
        {
            "~/Areas/{2}/Views/{1}/{0}.html",
            "~/Areas/{2}/Views/{1}/{0}.htm",
            "~/Areas/{2}/Views/Shared/{0}.html",
            "~/Areas/{2}/Views/Shared/{0}.htm"
        };

        ViewLocationFormats = new[]
        {
            "~/Views/{1}/{0}.html",
            "~/Views/{1}/{0}.htm",
            "~/Views/Shared/{0}.html",
            "~/Views/Shared/{0}.htm"
        };
        MasterLocationFormats = new[]
        {
            "~/Views/{1}/{0}.html",
            "~/Views/{1}/{0}.htm",
            "~/Views/Shared/{0}.html",
            "~/Views/Shared/{0}.htm"
        };
        PartialViewLocationFormats = new[]
        {
            "~/Views/{1}/{0}.html",
            "~/Views/{1}/{0}.htm",
            "~/Views/Shared/{0}.html",
            "~/Views/Shared/{0}.htm"
        };

        FileExtensions = new[]
        {
            "html",
            "htm",
        };
    }

    protected virtual string GetContent(string viewFilePath)
    {
        string result = null;
        if (!string.IsNullOrWhiteSpace(viewFilePath))
        {
            if (_useCache)
            {
                result = TryCache(viewFilePath);
            }

            if (result == null)
            {
                using (StreamReader streamReader = File.OpenText(viewFilePath))
                {
                    result = streamReader.ReadToEnd();
                }

                result = ParseContent(result);

                if (_useCache)
                {
                    CacheIt(viewFilePath, result);
                }
            }
        }

        return result;
    }

    static readonly Regex TildaRegularExpression = new Regex(@"~/", RegexOptions.Compiled);

    /// <summary>
    /// Finds all tilda paths in the content and replace it for current path
    /// </summary>
    /// <param name="content"></param>
    /// <returns></returns>
    protected virtual string ParseContent(string content)
    {
        if (String.IsNullOrWhiteSpace(content))
        {
            return content;
        }

        string absolutePath = VirtualPathUtility.ToAbsolute("~/");

        string result = TildaRegularExpression.Replace(content, absolutePath);
        return result;
    }

    protected override IView CreatePartialView(ControllerContext controllerContext, string partialPath)
    {
        HttpContextBase httpContextBase = controllerContext.RequestContext.HttpContext;

        string filePath = httpContextBase.Server.MapPath(partialPath);
        string content = GetContent(filePath);
        return new StaticView(content);
    }

    protected override IView CreateView(ControllerContext controllerContext, string viewPath, string masterPath)
    {
        HttpContextBase httpContextBase = controllerContext.RequestContext.HttpContext;

        string result = null;
        if (!string.IsNullOrWhiteSpace(masterPath))
        {
            string filePath = httpContextBase.Server.MapPath(masterPath);
            result = GetContent(filePath);
        }

        string physicalViewPath = httpContextBase.Server.MapPath(viewPath);
        result += GetContent(physicalViewPath);
        return new StaticView(result);
    }

    protected virtual string TryCache(string filePath)
    {
        HttpContext httpContext = HttpContext.Current;
        if (httpContext != null && httpContext.Cache != null)
        {
            string cacheKey = CacheKey(filePath);
            return (string)httpContext.Cache[cacheKey];
        }
        return null;
    }

    protected virtual bool CacheIt(string filePath, string content)
    {
        HttpContext httpContext = HttpContext.Current;
        if (httpContext != null && httpContext.Cache != null)
        {
            string cacheKey = CacheKey(filePath);
            httpContext.Cache.Add(cacheKey, content, new CacheDependency(filePath), AbsoluteTimeout.GetValueOrDefault(Cache.NoAbsoluteExpiration), SlidingTimeout.GetValueOrDefault(Cache.NoSlidingExpiration), Priority.GetValueOrDefault(CacheItemPriority.AboveNormal), CacheItemRemovedCallback);
            return true;
        }

        return false;
    }

    protected virtual string CacheKey(string serverPath)
    {
        return serverPath;
    }

    protected virtual void CacheItemRemovedCallback(string key, object value, CacheItemRemovedReason reason)
    {
        _log.InfoFormat("CacheItemRemovedCallback(string key='{0}', object value = ..., {1} reason={2})", key, reason.GetType().Name, reason);
    }
}

public class MvcApplication : System.Web.HttpApplication
{
    protected void Application_Start()
    {
        ViewEngines.Engines.Add(new HtmlStaticViewEngine(new TimeSpan(12,0,0,0)));
    }
}

public class StaticView : IView
{
    private readonly string _text;

    public StaticView(string text)
    {
        _text = text;
    }

    public void Render(ViewContext viewContext, TextWriter writer)
    {
        if (! string.IsNullOrEmpty(_text))
        {
            writer.Write(_text);
        }
    }
}

注意：此代码仅在使用简单的渲染用途时进行测试部分观点

Answer 4

您是否有理由将内容保存在HTML文件中而不是部分视图中？

如果您在snippet.ascx文件夹中创建名为Views/Shared的文件，则可以使用snippet.ascx

将该<% Html.RenderPartial("snippet"); %>文件的内容导入任意视图

Answer 5

要将静态html文件包含到MVC视图中，请执行以下操作：

<!-- #include virtual="~\Content\snippet.htm" -->

Answer 6

对于ASP .NET Core 3.1 Razor页面，您可以这样做：

@Html.Raw(System.IO.File.ReadAllText("wwwroot/Content/snippet.html"));

在此处查看有关静态文件的文档：

https://docs.microsoft.com/en-us/aspnet/core/fundamentals/static-files?view=aspnetcore-3.1

包括从〜/ Content到ASP.NET MVC视图的静态html文件

6 个答案:

使用您自己的视图引擎