如何访问在剃刀编辑模板包含模型实例？ [英] How can I access the containing model instance in a Razor editor template?

问题描述

我在名为下拉编辑模板，我调用以下code一 UIHint 。

 如果（ViewData.ModelMetadata.AdditionalValues​​.ContainsKey（TemplateControlParameters））
{
    VAR cparms =（词典＆LT;字符串对象＆gt;）ViewData.ModelMetadata.AdditionalValues​​ [TemplateControlParameters];
    。VAR LISTNAME = cparms [SelectListName]的ToString（）;
    名单=（的SelectList）计算机[LISTNAME]
}
 

的 SelectListName 的控制参数应该指向外模式的的SelectList 属性，即包含物业作为模型此模板编辑。但是，我无法找到一个方法来引用包含模型实例，仅包含模型类型。我怎样才能访问该模板被调用为模型的实例？

最接近的解决方案：我创建了覆盖视图（字符串的viewName，串masterName，对象模型）并注入该视图派生Controller类模型的选择列表字典（的IDictionary＆LT;字符串的SelectList＆GT; ）到视图中的数据：

 保护覆盖的ViewResult视图（字符串的viewName，串masterName，对象模型）
{
    VAR的结果= base.View（的viewName，masterName，模型）;
    如果（（型号为ViewModelBase）及＆放大器;！（ViewData.ContainsKey（SelectListsViewDataKey）））
    {
        VAR VM =（ViewModelBase）模型;
        result.ViewData.Add（SelectListsViewDataKey，vm.GetSelectLists（））;
    }
    返回结果;
}
 

解决方案

您可以得到母公司的元数据，但我不认为你可以得到父模型实例：

  @ {
    VAR ParentType的= ViewData.ModelMetadata.ContainerType;
    VAR元= ModelMetadataProviders.Current.GetMetadataForType（NULL，ParentType的）;
}
 

I have the following code in an editor template called DropDown, which I invoke with a UIHint.

if (ViewData.ModelMetadata.AdditionalValues.ContainsKey("TemplateControlParameters"))
{
    var cparms = (Dictionary<string, object>)ViewData.ModelMetadata.AdditionalValues["TemplateControlParameters"];
    var listName = cparms["SelectListName"].ToString();
    list = (SelectList)ViewData[listName];
}

The SelectListName control parameter is supposed to point to a SelectList property of the 'outer' model, i.e. the model that contains the property being edited by this template. However, I can't find a way to reference the containing model instance, only the containing model type. How can I access the instance of the model that this template is being invoked for?

CLOSEST SOLUTION: I have created a derived Controller class that overrides View(string viewName, string masterName, object model) and injects the view model's select list dictionary (IDictionary<string, SelectList>) into the view data:

protected override ViewResult View(string viewName, string masterName, object model)
{
    var result = base.View(viewName, masterName, model);
    if ((model is ViewModelBase) && (!ViewData.ContainsKey(SelectListsViewDataKey)))
    {
        var vm = (ViewModelBase)model;
        result.ViewData.Add(SelectListsViewDataKey, vm.GetSelectLists());
    }
    return result;
}

解决方案

You could get the parent metadata but I don't think that you can get the parent model instance:

@{
    var parentType = ViewData.ModelMetadata.ContainerType;
    var metadata = ModelMetadataProviders.Current.GetMetadataForType(null, parentType);
}

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