EditorFor(model => model.PropertyName，new {myKey =“myValue”})
如何检查additionalViewData的内容，添加或附加到自定义HTML帮助程序中的键等的现有值？
我试过这些方法：
>转换为字典< string，object>()和add / append值：不起作用，因为它在MVC中的EditorFor的实现使用新的RouteValueDictionary(additionalViewData)，它将字典嵌入字典
>使用新的RouteValueDictionary(additionalViewData)转换为RouteValueDictionary，但与上述相同(或非常类似)的问题
我也开放“你做错了” – 也许我错过了一个更简单的方法。请记住，我想要做的是编写一个可重用的HTML帮助器，并向customViewData添加一些值以供自定义视图使用。一些值取决于属性的元数据，所以它不是那么容易，只是使用一堆不同的模板。
更新我正在做的事情的例子：
public static MvcHtmlString myNullableBooleanFor<TModel,TValue>(this HtmlHelper<TModel> htmlHelper,Expression<Func<TModel,TValue>> choice,string templateName,object additionalViewData)
{
ModelMetadata Metadata = ModelMetadata.FromLambdaExpression(choice,htmlHelper.ViewData);
/*
here need to add to additionalViewData some key values among them:
{ propertyName,Metadata.PropertyName }
*/
StringBuilder sb = new StringBuilder();
sb.AppendLine(htmlHelper.EditorFor(choice,templateName,additionalViewData).ToString());
MvcHtmlString validation = htmlHelper.ValidationMessageFor(choice);
if (validation != null)
sb.AppendLine(validation.ToString());
return new MvcHtmlString(sb.ToString());
}
更新当我将匿名对象转换为Dictionary< string，object>()并将该字典传递给EditorFor()时会发生什么：
我在Razor视图中放了一个断点，并检查了ViewData。看来，传递给EditorFor()的字典放在另一个Dictionary< string，object>()中。在“立即窗口”中，ViewData如下所示：
ViewData.Keys
Count = 4
[0]: "Comparer"
[1]: "Count"
[2]: "Keys"
[3]: "Values"
看看字典里面有字典的内容吗？是的，实际的数据是在那个内部的字典，但不出意料的是这不行。
增加赏金。
解决方法@H_502_29@
如果我理解正确，您将尝试迭代匿名类型的属性。如果是的话：
How do I iterate over the properties of an anonymous object in C#?
[编辑]
好的，这不止于此。这真的很麻烦我，因为我喜欢C#，它不会让我做Python做的，我也很喜欢。所以这里是一个解决方案，如果你使用C#4，但它是凌乱的，将工作的类似的问题，但我可能不完全是为你：
// Assume you've created a class to hold commonly used additional view data
// called MyAdditionalViewData. I would create an inheritance hierarchy to
// contain situation-specific (area-specific,in my case) additionalViewData.
class MyAdditionalViewData
{
public string Name { get; set; }
public string Sound { get; set; }
}
/* In your views */
// Pass an instance of this class in the call to your HTML Helper
EditorFor(model => model.PropertyName,new { adv = new MyAdditionalViewData { Name = "Cow",Sound = "Moo" } }) ;
/* In your HTML helper */
// Here's the C# 4 part that makes this work.
dynamic bovine = new ExpandoObject();
// Copy values
var adv = x.adv;
if (adv.Name != null) bovine.Name = adv.Name;
if (adv.Sound != null) bovine.Sound = adv.Sound;
// Additional stuff
bovine.Food = "Grass";
bovine.Contents = "Burgers";
// When the MVC framework converts this to a route value dictionary
// you'll get a proper object,not a dictionary within a dictionary
var dict = new RouteValueDictionary(bovine);
必须有更好的办法。
[编辑]
好的，这不止于此。这真的很麻烦我，因为我喜欢C#，它不会让我做Python做的，我也很喜欢。所以这里是一个解决方案，如果你使用C#4，但它是凌乱的，将工作的类似的问题，但我可能不完全是为你：
// Assume you've created a class to hold commonly used additional view data
// called MyAdditionalViewData. I would create an inheritance hierarchy to
// contain situation-specific (area-specific,in my case) additionalViewData.
class MyAdditionalViewData
{
public string Name { get; set; }
public string Sound { get; set; }
}
/* In your views */
// Pass an instance of this class in the call to your HTML Helper
EditorFor(model => model.PropertyName,new { adv = new MyAdditionalViewData { Name = "Cow",Sound = "Moo" } }) ;
/* In your HTML helper */
// Here's the C# 4 part that makes this work.
dynamic bovine = new ExpandoObject();
// Copy values
var adv = x.adv;
if (adv.Name != null) bovine.Name = adv.Name;
if (adv.Sound != null) bovine.Sound = adv.Sound;
// Additional stuff
bovine.Food = "Grass";
bovine.Contents = "Burgers";
// When the MVC framework converts this to a route value dictionary
// you'll get a proper object,not a dictionary within a dictionary
var dict = new RouteValueDictionary(bovine);
必须有更好的办法。
