ASP.NET Web API read model inside action filter

Question

I have a special case when I need to get some data from request body (or model let say) inside action filter (AuthorizationFilterAttribute). I have found this way:

public async override Task OnAuthorizationAsync(HttpActionContext actionContext, CancellationToken cancellationToken)
{
    var model = await actionContext.Request.Content.ReadAsAsync<XYZ>();
    var valueINeed = model.Something;
    etc...
}

This works fine but unfortunately after calling ReadAsAsync<> once it is not possible to read model again (I guess that ReadAsAsync<> move position in underlining stream). Because it can't be read again model not make it into controller action:

public async Task<HttpResponseMessage> Put([FromBody]XYZ order)
{
    // order is null here
}

Any thoughts how to read model in action filter or how to work around this problem?

Community · Accepted Answer · 2017-05-23 12:12:46Z

1

In Web API, the response body is a read forward only stream. So once you read it, you cannot read it again.

Consider passing the something in query params or some other parameter, other than body.

edited May 23, 2017 at 12:12

CommunityBot

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answered Sep 3, 2014 at 14:17

Mrchief

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