剃须刀引擎模板中的类 [英] Classes in razor engine template

问题描述

是否可以在模板中创建类?像...

Is it possible to create classes within a template? Something like...

@{
    public class MyClass {
        public MyClass() {
            Three = new List<string>();
        }

        public string One { get; set; }
        public int Two { get; set; }
        public List<string> Three { get; set; }
    }
}

当前，我得到无法编译模板.请查看错误列表以获取详细信息."当我尝试这样做时.我想获取XML内容，并使用XmlSerializer在模板中创建MyClass的实例.我不能先进行反序列化并将其推入模型中，因为类可能会因模板而异.

Currently I get "Unable to compile template. Check the Errors list for details." when I try to do this. I would like to take XML content and use XmlSerializer to create an instance of MyClass within the template. I can't do the deserialization before hand and shove it into the model because the classes could vary depending on the template.

推荐答案

我将发布 CodePlex讨论在这里:

我不确定目前是否可行.当您使用代码块(@ {})时，实际上是在方法中编写代码，例如您上面的代码将执行以下操作:

I'm not sure that is currently possible. When you use codeblocks (@{ }), you're actually writing code within a method, e.g. your above code would do something like:

public void Execute()
{
    this.Clear();
    public class MyClass {
        public MyClass() {
            Three = new List<string>();
        }

        public string One { get; set; }
        public int Two { get; set; }
        public List<string> Three { get; set;}
    }
}

...这当然不是有效的C#.您将面临的另一个问题是，要使用xml序列化/反序列化，必须知道类型，但是如果您在模板本身中定义类型，那么首先如何反序列化呢?

...which of course, is not valid C#. The other problem you will face, is that to use xml serialisation/deserialisation, the type must be known, but if you are defining your type within the template itself, how could you deserialise it in the first place?

您可能所能做的就是使用自定义基本模板:

What you could do, is use a custom base template:

public class CustomTemplateBase<T> : TemplateBase<T>
{
    public dynamic Instance { get; set; }

    public dynamic CreateInstance(string typeName)
    {
        Type type = Type.GetType(typeName);

        // You'd to your deserialisation here, I'm going to
        // just cheat and return a new instance.
        return Activator.CreateInstance(type);
    }
}

使用动态属性和动态返回类型，我们定义了一个方法，该方法使我们可以创建一个实例(通过激活或反序列化等)并调用该实例上的成员访问权限.要在模板中使用它，您可以执行以下操作:

Using a dynamic property and dynamic return type, we've defined a method that will let us create an instance (through activation or deserialisation, etc.) and call member access on it. To use that in a template, you could then do:

@{
  Instance = CreateInstance("ConsoleApplication1.MyClass, ConsoleApplication1");
  Instance.One = "Hello World";
}
<h1>@Instance.One</h1>

其中"MyClass"是在应用程序中的某个位置定义的.重要的是，我正在为每个模板创建一个实例.

Where "MyClass" is a defined somewhere in my application. The important thing is, I'm creating an instance per template.

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