可以。获得使用标志接口和扩展方法的语法

You can get the syntax by using marker interfaces and extension methods.

先决条件：接口需要定义它后来被扩展方法的合同。基本上，接口定义了能够实现一特质的合同;理想情况下，你添加接口的类应该已经具备了本接口的所有成员，这样的没有的额外的实施是必需的。

Prerequisite: the interfaces need to define the contract which is later used by the extension method. Basically the interface defines the contract for being able to "implement" a trait; ideally the class where you add the interface should already have all members of the interface present so that no additional implementation is required.

public class Client {
  public double Weight { get; }

  public double Height { get; }
}

public interface TClientWeight {
  double Weight { get; }
}

public interface TClientHeight {
  double Height { get; }
}

public class ClientA: Client, TClientWeight { }

public class ClientB: Client, TClientHeight { }

public class ClientC: Client, TClientWeight, TClientHeight { }

public static class TClientWeightMethods {
  public static bool IsHeavierThan(this TClientWeight client, double weight) {
    return client.Weight > weight;
  }
  // add more methods as you see fit
}

public static class TClientHeightMethods {
  public static bool IsTallerThan(this TClientHeight client, double height) {
    return client.Height > height;
  }
  // add more methods as you see fit
}

使用这样的：

var ca = new ClientA();
ca.IsHeavierThan(10); // OK
ca.IsTallerThan(10); // compiler error

编辑：提出的问题是如何额外的数据可能被存储。

The question was raised how additional data could be stored. This can also be addressed by doing some extra coding:

public interface IDynamicObject {
  bool TryGetAttribute(string key, out object value);
  void SetAttribute(string key, object value);
  // void RemoveAttribute(string key)
}

public class DynamicObject: IDynamicObject {
  private readonly Dictionary<string, object> data = new Dictionary<string, object>(StringComparer.Ordinal);

  bool IDynamicObject.TryGetAttribute(string key, out object value) {
    return data.TryGet(key, out value);
  }

  void IDynamicObject.SetAttribute(string key, object value) {
    data[key] = value;
  }
}

然后，将性状的方法可以添加和检索数据

And then, the trait methods can add and retrieve data if the "trait interface" inherits from IDynamicObject:

public class Client: DynamicObject { /* implementation see above */ }

public interface TClientWeight, IDynamicObject {
  double Weight { get; }
}

public class ClientA: Client, TClientWeight { }

public static class TClientWeightMethods {
  public static bool HasWeightChanged(this TClientWeight client) {
    object oldWeight;
    bool result = client.TryGetAttribute("oldWeight", out oldWeight) && client.Weight.Equals(oldWeight);
    client.SetAttribute("oldWeight", client.Weight);
    return result;
  }
  // add more methods as you see fit
}

请注意：通过实施 IDynamicMetaObjectProvider 以及对象甚至会允许暴露通过DLR的动态数据，用动态使用时，使得进入透明的附加属性关键字。

Note: by implementing IDynamicMetaObjectProvider as well the object would even allow to expose the dynamic data through the DLR, making the access to the additional properties transparent when used with the dynamic keyword.