This is the last of the series and you can find the previous parts below:

FluentValidation and PostSharp for RESTful WCF parameter validation – Part 1
FluentValidation and PostSharp for RESTful WCF parameter validation – Part 2
FluentValidation and PostSharp for RESTful WCF parameter validation – Part 3

The promised example solution at: https://github.com/naeemkhedarun/WcfValidation 

You will need PostSharp 2.0 installed, the community edition is fine.

This is a functional RESTful WCF service where you can send a product using a JSON request, and have the same product sent back in the response.

[RestArgumentValidation]
public ProductItem Create([ProductItemValidator] ProductItem instance)
{
    return new ProductItem
               {
                   Name = instance.Name
               };
}

On my current project we use a structure similar to the sample project to organise our attributes and validators.

To test this service I’m using the REST Console application for Chrome. First we need to set up our target:

When we make the request we should get a helpful HTTP Status Code of 400 (Bad Request):

We should also get a response body giving us some more detail about the issue with our request.

To make a valid request, we simply send the correct request body which looks like:

Running the request once more we receive the proper response:

And there you have it, I hope you’ve found this useful!