Dictionary input parameter of a WCF method not receiving the value

Question

I declared a method like this:

public int MyFunc(int x1, Dictionary<string, string> x2 , string x3 , Guid x4)

and I sended a request from Postman with this body:

{
   
"x1" : "1",
"x2" : {
        "IsRevisit": true,
        "key2": "value2"
       },
"x3" : "test",
"x4" : "A3E133EA-A692-482A-837A-0BDC9F2D0536"
}

Problem : x1, x3 and x4 are receiving their value but nothing for x2. I put break point on the line:

Solutions didn't work

• I declared the method like this:

public int MyFunc(int x1, Dictionary<string, object> x2 , string x3 , Guid x4)

• I sended dictionary like this: "IsRevisit": "true"

Eventually, I declared a structure similar to a dictionary to accomplish what I intended. However, I'm encountering this problem of receiving the value. Why it's happening?

Project Information

• WCF Service
• .net framework 4.6
• Visual Studio 2022 version 17.6.2

Answer 1

To catch the specific error you got, you may use WCF Trace Logging.

We need to know what type are we passing so that it can deserialise that object in wcf. So WCF is strongly typed.

public int MyFunc(int x1, Dictionary<string, object> x2 , string x3 , Guid x4)

The WCF will throw Exception because public int MyFunc(Dictionary<string, object> x2) catch all type defined that WCF can not deserialise.

You may define a method like below :

 [OperationContract]
     int Method(MyClass myClassObject);

And put it like this Dictionary<string,myClassObject>.Then it will work.