C＃中的“无形状”对象

Question

I am receiving objects using wcf, each object is different and I would like to instead of creating an object for each received object so I can manipulate it, to pass/copy each received object to only one shapeless object each time. It there such a thing?

A pseudo-code example:

Shapeless_object = received_obj_A;
if (Shapeless_object.name = "I_dont_know") {
   Shapeless_object.count++;
}

Shapeless_object = received_obj_B;
if (Shapeless_object.name = "I_dont_know_too") {
   Shapeless_object.count--;
   Shapeless_object.age = 20;
}

received_obj_A and B are different with different parameters but passed in a single object. I hope I made my question as clear as possible.

Answer 1

You mention WCF origins: it is easy to add interfaces to WCF types via partial class : just declare the common interface - perhaps:

interface ICommon {
    string name {get;}
    // ...
}

Then tell the compiler to infer the interface for each of your WCF types:

namespace TheWcfNamespace {
    partial class SomeWcfType : ICommon {}
    partial class AnotherWcfType : ICommon {}
    partial class WhateverWcfType : ICommon {}
}

As long as SomeWcfType etc all have the members to implement the interface, you can now treat all your WCF objects as ICommon .

---

Alternatively, you might be able to do what you want here via dynamic - just replace Shapeless_object with dynamic - however, that seems an abuse of the intent. A more classic implementation here would be interfaces:

if(obj is IDontKnow) {
   // TODO: access as an IDontKnow
}

if (obj is IDontKnowToo) {
    // TODO: access as an IDontKnowToo
}

You can of course combine this with the partial class approach mentioned above.

Answer 2

You could cast them to dynamic , but it would be a performance hit.

dynamic shapeless = received_obj_A;
if (shapeless .name = "I_dont_know") {
   shapeless.count++;
}

shapeless  = received_obj_B;
if (shapeless.name = "I_dont_know_too") {
   shapeless.count--;
   shapeless.age = 20;
}

Note that you do lose static typing, obviously.

Answer 3

Do you mean this?

var a = received_obj_A;
if (a.name = "I_dont_know") {
   Shapeless_object.count++;
}

var b = received_obj_B;
if (b.name = "I_dont_know_too") {
   Shapeless_object.count--;
   Shapeless_object.age = 20;
}

Dont use the base object here, because you need to check for the instance and try to cast it.

Don't do:

object a = received_obj_A; // Here you need to cast

if (a.name = "I_dont_know") {
   Shapeless_object.count++;
}

object b = received_obj_B; // Here you need to cast
if (b.name = "I_dont_know_too") {
   Shapeless_object.count--;
   Shapeless_object.age = 20;
}