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public async Task<HttpResponseMessage> getOne(HttpRequestMessage request, int id) { return CreateResponse(async () => { var category = await _unitOfWork.Categories.GetSingleAsync(id); var categoryVm = Mapper.Map<Category, CategoryViewModel>(category); HttpResponseMessage response = request.CreateResponse<CategoryViewModel>(HttpStatusCode.OK, categoryVm); return response; }); }

Base Class 

protected Task<IHttpActionResult> CreateResponse(Func<IHttpActionResult, Task> function) { IHttpActionResult response = null; try { response = function.Invoke(); } }
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Read up on Cross cutting concerns.

You are giving yourself unnecessary trouble. Your example can be reduced to :

public async Task<IHttpActionResult> getOne(int id) { var category = await _unitOfWork.Categories.GetSingleAsync(id); var categoryVm = Mapper.Map<Category, CategoryViewModel>(category); return Ok(categoryVm); }

Try to keep controller lean.

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