MVC父子嵌套视图返回模型 [英] MVC parent and child nested views returning models

问题描述

假设我有一个带parentModel的parent.cshtml视图和一个带有childModel的child.cshtml视图. 此子操作为[ChildActionOnly]，并呈现在parent.cshtml中:@Html.Action("ChildAction").

Suppose I have a parent.cshtml view with a parentModel, and a child.cshtml view with a childModel. This child action is [ChildActionOnly] and is rendered in parent.cshtml: @Html.Action("ChildAction").

现在，在控制器/ParentAction中

Now, in controller/ParentAction

public ActionResult ParentAction() {return View();}
[HttpPost] 
public ActionResult ParentAction(ParentModel parentmodel) { 
    if(!ModelState.IsValid) {
      ...
      ModelState.AddModelError("", "parent view has an error");
    }
    return View(parentmodel); // pass the ball back to user
}

在控制器/ChildAction中

in controller/ChildAction

[ChildActionOnly]
public ActionResult ChildAction() {return View();}
[HttpPost] 
public ActionResult ChildAction(ChildModel childmodel) { 
     if(!ModelState.IsValid) {
       ...
       ModelState.AddModelError("", "child view has an error");
    }
    //??? return ParentView(parentmodel, childmodel) ??? how do i do this??? 
}

在子操作中，如何返回ParentView(它也呈现ChildView)，并将数据保存在其模型中?

In the child action, how do I return to the ParentView (that also renders the ChildView), and preserve the data in their models?

-----

我的意思是如何不这样做.子操作中的return View(childmodel);无法获得我们想要看到的内容，因为它只会为我们提供仅具有子视图的部分"页面，而父部分丢失了. RedirectToAction("ParentAction");将再次为我们提供完整视图，但将丢失模型.不确定如何在嵌套视图中处理返回的模型.那就是我被困住的地方.

My point is how not to do that. return View(childmodel); from child action will not get us what we want to see, because it will only give us a 'partial' page with child view only, the parent part is missing. RedirectToAction("ParentAction"); will give us full view again, but it will lose the models. Not sure how to handle returning models in nested views. That's where I am stuck.

推荐答案

首先，您必须创建一个包装ParentModel和ChildModel的通用模型，否则将ChildModel用作ParentModel的属性.建议您在这种情况下使用Html.RenderPartial而不是调用子操作并呈现子视图.

First you have to create a common model that wraps the ParentModel and ChildModel else put the ChildModel as a property of the ParentModel. Instead of calling a child action and render the child view I would suggest you use Html.RenderPartial in this case.

假设ParentModel包装了ChildModel，然后从ParentView.cshtml中渲染the ChildView.cshtml，

Let say the ParentModel wraps the ChildModel then from the ParentView.cshtml you could render the ChildView.cshtml by,

@Html.Partial("ChildView", Model.ChildModel);

现在，从子发布操作中，您必须构建ParentModel并返回ParentView.

Now from the child post action you have to build the ParentModel and return the ParentView.

[HttpPost] 
public ActionResult ChildAction(ChildModel childmodel) { 
    if(!ModelState.IsValid) 
    {
       ...
       ModelState.AddModelError("", "child view has an error");
    } 

    ParentModel model = .. build the model from querying database.

    return View("ParentView", model);
}

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