How to ensure ASP.net Web API controller's parameter is not null?

Question

I created a ASP.net Web API controller like that:

public class UsersController : ApiController
{
    //...
    public void Put([FromBody]User_API user, long UpdateTicks)
    {
        user.UpdateTicks = UpdateTicks;
        //...
    }
}

The "user" parameter will be null if the client does not provide correct arguments. Can I make a global filter to check every parameter like this, and will return a 400 message if any error occurs.

check out this stackoverflow.com/questions/11686690/…

cuongle
– cuongle

2013-01-25 07:23:47 +00:00
Commented Jan 25, 2013 at 7:23 — cuongle
– cuongle, Commented Jan 25, 2013 at 7:23

guogangj · Accepted Answer · 2013-01-25 07:42:59Z

11

Finally, I got the solution:

public class ModelValidateFilterAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        if (actionContext.ActionArguments.Any(v => v.Value==null))
        {
            actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.BadRequest);
        }
    }
}

And...

//In Application_Start()
GlobalConfiguration.Configuration.Filters.Add(new ModelValidateFilterAttribute());

answered Jan 25, 2013 at 7:42

guogangj

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2 Comments

dubs Over a year ago

This solution will work fine when your action does not use the FromUri parameter attribute. I have found that if you use (for example): FromUri (Name="request") and your parameter name is myRequest, then the expected ActionArguments will be null - returning a BadResponse. I have not found a clean way around this yet.

Thomas Over a year ago

@dubs could you do a for each and type check on object? argument.GetType().IsClass

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