C# 有没有办法创建一个行为与dynamic或ExpandooObject相同的类？

我想创建一个具有固定属性的类，并能够将其扩展为动态或扩展对象可以。 e、 g:

用法：

DynamicInstance myCustomObj = new DynamicInstance();

myCustomObj.FixedTestProperty = "FixedTestValue";
myCustomObj.DynamicCreatedTestProperty = "Custom dynamic property value";

最后，如果我用json.net或其他东西序列化该类，输出如下内容：

{
   FixedTestProperty: 'FixedTestValue',
   DynamicCreatedTestProperty: 'Custom dynamic property value'
}

---

您需要继承

DynamicObject

并重写

TryGetMember

和

TrySetMember

方法。下面是一个类，它有一个名为

one

的属性。但是，您可以动态添加更多内容

public class ExpandOrNot : DynamicObject
{
    public string One { get; set; }

    // The inner dictionary.
    Dictionary<string, object> dictionary
        = new Dictionary<string, object>();

    // This property returns the number of elements
    // in the inner dictionary.
    public int Count
    {
        get
        {
            return dictionary.Count;
        }
    }

    // If you try to get a value of a property 
    // not defined in the class, this method is called.
    public override bool TryGetMember(
        GetMemberBinder binder, out object result)
    {
        // Converting the property name to lowercase
        // so that property names become case-insensitive.
        string name = binder.Name.ToLower();

        // If the property name is found in a dictionary,
        // set the result parameter to the property value and return true.
        // Otherwise, return false.
        return dictionary.TryGetValue(name, out result);
    }

    // If you try to set a value of a property that is
    // not defined in the class, this method is called.
    public override bool TrySetMember(
        SetMemberBinder binder, object value)
    {
        // Converting the property name to lowercase
        // so that property names become case-insensitive.
        dictionary[binder.Name.ToLower()] = value;

        // You can always add a value to a dictionary,
        // so this method always returns true.
        return true;
    }
}

更多信息

---

这可以在DynamicObject上使用TrySetMember

---

下面的示例演示了如何操作：

那么，您尝试了什么？从

DynamicObject

继承确实是一种方法。您可以使用库。有关更多信息，请参见此内容。@s.m.是的，我想是的，但在这个实现中，我缺少固定属性的intellisense。也许有办法避免这种情况。因为如果我没有这个属性的intellisense，我认为没有理由创建我自己的对象，而不是创建一个动态的foo=new ExpandoObject（）。@Saravana谢谢，我看到了，但是在博客上发布了。我会看看这个回购协议。哦，好吧，我明白了，但是当我键入exp时，无法在IntelliSense上获得固定属性。如果引用类型为

动态

，那么不，您将无法获得任何IntelliSense。但是如果你投到

ExpandoOrNot

，你将获得该组织成员的智能。这是真的！谢谢还有一件事。你知道为什么JObject.FromObject（exp）返回一个空的JObject吗？

public class ExpandOrNot : DynamicObject
{
    public string One { get; set; }

    // The inner dictionary.
    Dictionary<string, object> dictionary
        = new Dictionary<string, object>();

    // This property returns the number of elements
    // in the inner dictionary.
    public int Count
    {
        get
        {
            return dictionary.Count;
        }
    }

    // If you try to get a value of a property 
    // not defined in the class, this method is called.
    public override bool TryGetMember(
        GetMemberBinder binder, out object result)
    {
        // Converting the property name to lowercase
        // so that property names become case-insensitive.
        string name = binder.Name.ToLower();

        // If the property name is found in a dictionary,
        // set the result parameter to the property value and return true.
        // Otherwise, return false.
        return dictionary.TryGetValue(name, out result);
    }

    // If you try to set a value of a property that is
    // not defined in the class, this method is called.
    public override bool TrySetMember(
        SetMemberBinder binder, object value)
    {
        // Converting the property name to lowercase
        // so that property names become case-insensitive.
        dictionary[binder.Name.ToLower()] = value;

        // You can always add a value to a dictionary,
        // so this method always returns true.
        return true;
    }
}

dynamic exp = new ExpandOrNot { One = "1" };
exp.Two = "2";