WCF REST API返回.net应用程序类型

Question

I have an API that can returns multiple things that I don't know in advance so I have to put as return type System.Object .

I have some problems for some types. Like when it returns different objects its fine but when it returns an System.Int32 , it doesn't work and tells me:

Cannot serialize parameter of type 'System.Int32' because it is not the exact type 'System.Object' in the method signature and is not in the known types collection.

Any idea ?

I know we can use ServiceKnownType but I'd like to know if there is other way to do it? I would need all the existing types (int, bool, string, etc..) in this ...

Answer 1

Do not return System.Object type on service contracts, even when it WCF 4 REST. How default serializers/formatters could produce response for your contract.

You can return byte array, convert your System.Object into string and return it. Anyway you can always serialize your objects to XML or JSON and return as string.

Also link to forum with same question, maybe it helps you: http://social.msdn.microsoft.com/Forums/nl-NL/wcf/thread/1f43e9b4-39a4-481b-88f0-18c7d4416745

Answer 2

You can make a simple if statement that checks to see if it is a int and then you can convert it to a object. By the way integers are not able to become objects til they are a string so if I did this I would do a simple:

blah.toString();

and bam you can now use it as a object.