Return Json object with Duplicate Keys using C#

Question

I\'m using WEB API to receive the request from the Client application to save the Contact Information and I need to send the Error Message only if data has an error otherwise no

Answer 1

No, this is not possible.

This would be invalid* JSON:

{
    "error" : {
        "SaveContactMethod":"FirstName Invalid",
        "SaveContactMethod":"LastName Invalid",
        "SaveContactMethod":"MiddleName Invalid"
    }
}

You can check this here:

Warning:Duplicate key, names should be unique.[Code 23, Structure 9]
Warning:Duplicate key, names should be unique.[Code 23, Structure 13]

_{*Depending on what you call valid}

_{If you realy want to go this route, according to RFC 4627, you could use the StringBuilder class.}

---

Since you don't seem to understand, what Depending on what you call valid means.

ECMA-262:

In the case where there are duplicate name Strings within an object, lexically preceding values for the same key shall be overwritten.

That means: If you get three SaveContactMethod's, you only want "MiddleName Invalid" in ECMA Script (JS). With c# serialization, this would not even be possible. You need to write your own JsonSerializer for it.