Razor 中的动态匿名类型导致 RuntimeBinderException [英] Dynamic Anonymous type in Razor causes RuntimeBinderException

问题描述

我收到以下错误:

'object' 不包含 'RatingName' 的定义

'object' does not contain a definition for 'RatingName'

当您查看匿名动态类型时，它显然具有 RatingName.

When you look at the anonymous dynamic type, it clearly does have RatingName.

我意识到我可以用元组来做到这一点，但我想了解为什么会出现错误消息.

I realize I can do this with a Tuple, but I would like to understand why the error message occurs.

推荐答案

在我看来，具有内部属性的匿名类型是一个糟糕的 .NET 框架设计决策.

Anonymous types having internal properties is a poor .NET framework design decision, in my opinion.

这是一个快速且不错的扩展来解决这个问题，即将匿名对象立即转换为 ExpandoObject.

Here is a quick and nice extension to fix this problem i.e. by converting the anonymous object into an ExpandoObject right away.

public static ExpandoObject ToExpando(this object anonymousObject)
{
    IDictionary<string, object> anonymousDictionary =  new RouteValueDictionary(anonymousObject);
    IDictionary<string, object> expando = new ExpandoObject();
    foreach (var item in anonymousDictionary)
        expando.Add(item);
    return (ExpandoObject)expando;
}

使用起来非常简单:

return View("ViewName", someLinq.Select(new { x=1, y=2}.ToExpando());

当然在您看来:

@foreach (var item in Model) {
     <div>x = @item.x, y = @item.y</div>
}

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