如何在Web表单中包含局部视图

我查看了MVC源代码,看看我是否能弄清楚如何做到这一点。控制器上下文、视图、视图数据、路由数据和html呈现方法之间似乎存在非常紧密的耦合。

最大的问题似乎是HttpContext-MVC页面依赖于HttpContextBase(而不是像WebForms那样依赖于HttpContext),虽然两者都实现了IServiceProvider,但它们并不相关。MVC的设计者们深思熟虑地决定不改变遗留的WebForms来使用新的上下文库,但他们确实提供了一个包装器。

public class WebFormController : Controller { }

public static class WebFormMVCUtil
{

    public static void RenderPartial( string partialName, object model )
    {
        //get a wrapper for the legacy WebForm context
        var httpCtx = new HttpContextWrapper( System.Web.HttpContext.Current );

        //create a mock route that points to the empty controller
        var rt = new RouteData();
        rt.Values.Add( "controller", "WebFormController" );

        //create a controller context for the route and http context
        var ctx = new ControllerContext( 
            new RequestContext( httpCtx, rt ), new WebFormController() );

        //find the partial view using the viewengine
        var view = ViewEngines.Engines.FindPartialView( ctx, partialName ).View;

        //create a view context and assign the model
        var vctx = new ViewContext( ctx, view, 
            new ViewDataDictionary { Model = model }, 
            new TempDataDictionary() );

        //render the partial view
        view.Render( vctx, System.Web.HttpContext.Current.Response.Output );
    }

}

<% WebFormMVCUtil.RenderPartial( "ViewName", this.GetModel() ); %>

完成控制器的流程 用于渲染视图,以及 Keith的解决方案只是用给定的模型渲染视图

一般步骤:

1. 创建实用程序类
3. 在你的 aspx 或 master page ,调用该实用程序方法进行局部渲染,传递控制器、视图以及要渲染的模型(作为对象)(如果需要),

让我们在这个例子中仔细检查一下

1) 创建一个名为的类 MVCUtility

    //Render a partial view, like Keith's solution
    private static void RenderPartial(string partialViewName, object model)
    {
        HttpContextBase httpContextBase = new HttpContextWrapper(HttpContext.Current);
        RouteData routeData = new RouteData();
        routeData.Values.Add("controller", "Dummy");
        ControllerContext controllerContext = new ControllerContext(new RequestContext(httpContextBase, routeData), new DummyController());
        IView view = FindPartialView(controllerContext, partialViewName);
        ViewContext viewContext = new ViewContext(controllerContext, view, new ViewDataDictionary { Model = model }, new TempDataDictionary(), httpContextBase.Response.Output);
        view.Render(viewContext, httpContextBase.Response.Output);
    }

    //Find the view, if not throw an exception
    private static IView FindPartialView(ControllerContext controllerContext, string partialViewName)
    {
        ViewEngineResult result = ViewEngines.Engines.FindPartialView(controllerContext, partialViewName);
        if (result.View != null)
        {
            return result.View;
        }
        StringBuilder locationsText = new StringBuilder();
        foreach (string location in result.SearchedLocations)
        {
            locationsText.AppendLine();
            locationsText.Append(location);
        }
        throw new InvalidOperationException(String.Format("Partial view {0} not found. Locations Searched: {1}", partialViewName, locationsText));
    }       

    //Here the method that will be called from MasterPage or Aspx
    public static void RenderAction(string controllerName, string actionName, object routeValues)
    {
        RenderPartial("PartialRender", new RenderActionViewModel() { ControllerName = controllerName, ActionName = actionName, RouteValues = routeValues });
    }

    public class RenderActionViewModel
    {
        public string ControllerName { get; set; }
        public string ActionName { get; set; }
        public object RouteValues { get; set; }
    }

DummyController

    //Here the Dummy controller with Dummy view
    public class DummyController : Controller
    {
      public ActionResult PartialRender()
      {
          return PartialView();
      }
    }

PartialRender.cshtml (剃刀视图) 虚拟控制器 对于以下内容,请注意,它将使用Html辅助程序执行另一个渲染操作。

@model Portal.MVC.MvcUtility.RenderActionViewModel
@{Html.RenderAction(Model.ActionName, Model.ControllerName, Model.RouteValues);}

MasterPage 或 页面 母板页 或 页面 页。(假设我们有一个名为控制器主页登录的PartialView)。

    <% MyApplication.MvcUtility.RenderAction("Home", "Login", new { }); %>

或者,如果你有一个进入行动的模型

    <% MyApplication.MvcUtility.RenderAction("Home", "Login", new { Name="Daniel", Age = 30 }); %>

这个解决方案很棒, 不使用ajax调用 ,这不会导致 对于嵌套视图,它 所以 不会为您带来新的会话 ,而且 将处理检索ActionResult的方法

多亏了 Using MVC RenderAction within a Webform

类似这样(使用jQuery)

<div id="mvcpartial"></div>

<script type="text/javascript">
$(document).load(function () {
    $.ajax(
    {    
        type: "GET",
        url : "urltoyourmvcaction",
        success : function (msg) { $("#mvcpartial").html(msg); }
    });
});
</script>

我正在使用MVC 2。NET 4需要将TextWriter传递到ViewContext中,因此您必须传入httpContextWrapper。回应。输出如下图所示。

    public static void RenderPartial(String partialName, Object model)
    {
        // get a wrapper for the legacy WebForm context
        var httpContextWrapper = new HttpContextWrapper(HttpContext.Current);

        // create a mock route that points to the empty controller
        var routeData = new RouteData();
        routeData.Values.Add(_controller, _webFormController);

        // create a controller context for the route and http context
        var controllerContext = new ControllerContext(new RequestContext(httpContextWrapper, routeData), new WebFormController());

        // find the partial view using the viewengine
        var view = ViewEngines.Engines.FindPartialView(controllerContext, partialName).View as WebFormView;

        // create a view context and assign the model
        var viewContext = new ViewContext(controllerContext, view, new ViewDataDictionary { Model = model }, new TempDataDictionary(), httpContextWrapper.Response.Output);

        // render the partial view
        view.Render(viewContext, httpContextWrapper.Response.Output);
    }

这是一种类似的方法,对我来说一直有效。其策略是将部分视图呈现为字符串,然后在WebForm页面中输出。

 public class TemplateHelper
{
    /// <summary>
    /// Render a Partial View (MVC User Control, .ascx) to a string using the given ViewData.
    /// http://www.joeyb.org/blog/2010/01/23/aspnet-mvc-2-render-template-to-string
    /// </summary>
    /// <param name="controlName"></param>
    /// <param name="viewData"></param>
    /// <returns></returns>
    public static string RenderPartialToString(string controlName, object viewData)
    {
        ViewDataDictionary vd = new ViewDataDictionary(viewData);
        ViewPage vp = new ViewPage { ViewData = vd};
        Control control = vp.LoadControl(controlName);

        vp.Controls.Add(control);

        StringBuilder sb = new StringBuilder();
        using (StringWriter sw = new StringWriter(sb))
        {
            using (HtmlTextWriter tw = new HtmlTextWriter(sw))
            {
                vp.RenderControl(tw);
            }
        }

        return sb.ToString();
    }
}

在代码后面的页面中,您可以执行以下操作

public partial class TestPartial : System.Web.UI.Page
{
    public string NavigationBarContent
    {
        get;
        set;
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        NavigationVM oVM = new NavigationVM();

        NavigationBarContent = TemplateHelper.RenderPartialToString("~/Views/Shared/NavigationBar.ascx", oVM);

    }
}

在页面中,您将可以访问呈现的内容

<%= NavigationBarContent %>

希望这能有所帮助!

这个解决方案采取了不同的方法。它定义了一个 System.Web.UI.UserControl 这种方法类似于HTML的AJAX调用,因为参数(如果有的话)是通过URL查询字符串给出的。

/控件/PartialViewControl.ascx文件

<%@ Control Language="C#" 
AutoEventWireup="true" 
CodeFile="PartialViewControl.ascx.cs" 
Inherits="PartialViewControl" %>

/控件/PartialViewControl.ascx.cs:

public partial class PartialViewControl : System.Web.UI.UserControl {
    [Browsable(true),
    Category("Configutation"),
    Description("Specifies an absolute or relative path to the content to display.")]
    public string contentUrl { get; set; }

    protected override void Render(HtmlTextWriter writer) {
        string requestPath = (contentUrl.StartsWith("http") ? contentUrl : "http://" + Request.Url.DnsSafeHost + Page.ResolveUrl(contentUrl));
        WebRequest request = WebRequest.Create(requestPath);
        WebResponse response = request.GetResponse();
        Stream responseStream = response.GetResponseStream();
        var responseStreamReader = new StreamReader(responseStream);
        var buffer = new char[32768];
        int read;
        while ((read = responseStreamReader.Read(buffer, 0, buffer.Length)) > 0) {
            writer.Write(buffer, 0, read);
        }
    }
}

<%@ Page Language="C#" %>
<%@ Register Src="~/controls/PartialViewControl.ascx" TagPrefix="mcs" TagName="PartialViewControl" %>
<h1>My MVC Partial View</h1>
<p>Below is the content from by MVC partial view (or any other URL).</p>
<mcs:PartialViewControl runat="server" contentUrl="/MyMVCView/"  />

FWW,我需要能够从现有的webforms代码中动态渲染部分视图,并将其插入到给定控件的顶部。我发现Keith的回答会导致部分视图在外部呈现 <html />

使用Keith和Hilarius的答案作为灵感,而不是直接呈现给HttpContext。电流。回应。输出时,我呈现了html字符串,并将其作为LiteralControl添加到相关控件中。

在静态辅助类中:

    public static string RenderPartial(string partialName, object model)
    {
        //get a wrapper for the legacy WebForm context
        var httpCtx = new HttpContextWrapper(HttpContext.Current);

        //create a mock route that points to the empty controller
        var rt = new RouteData();
        rt.Values.Add("controller", "WebFormController");

        //create a controller context for the route and http context
        var ctx = new ControllerContext(new RequestContext(httpCtx, rt), new WebFormController());

        //find the partial view using the viewengine
        var view = ViewEngines.Engines.FindPartialView(ctx, partialName).View;

        //create a view context and assign the model
        var vctx = new ViewContext(ctx, view, new ViewDataDictionary { Model = model }, new TempDataDictionary(), new StringWriter());

        // This will render the partial view direct to the output, but be careful as it may end up outside of the <html /> tag
        //view.Render(vctx, HttpContext.Current.Response.Output);

        // Better to render like this and create a literal control to add to the parent
        var html = new StringWriter();
        view.Render(vctx, html);
        return html.GetStringBuilder().ToString();
    }

    internal void AddPartialViewToControl(HtmlGenericControl ctrl, int? insertAt = null, object model)
    {
        var lit = new LiteralControl { Text = MvcHelper.RenderPartial("~/Views/Shared/_MySharedView.cshtml", model};
        if (insertAt == null)
        {
            ctrl.Controls.Add(lit);
            return;
        }
        ctrl.Controls.AddAt(insertAt.Value, lit);
    }