using HTTP Client to interact with Restful service created with ASP.Net WebAPI

Refer back to the article on how to implement CRUD operation using WebAPI. Today I am going to show you the other side of the story.

 

The code is surprisingly simple, let me show you one by one:

 

1. Create

 

public async Task<bool>CreateAsync(Person person)

        {

            HttpResponseMessage response = await PostAsJsonAsync<Person>(ServiceUris.ControllerBaseAddress, person);

            return response.IsSuccessStatusCode;

        }

 

2. Read all

 

        public async Task<IEnumerable<Person>> GetAsync()

        {

            var response = Get(ServiceUris.ControllerBaseAddress);

            if (response.IsSuccessStatusCode)

            {

                return await response.Content.ReadAsAsync<List<Person>>();

            }

            else

            {

                return null;

            }

        }

 

3. Read one

 

         public async Task<Person> GetAsync(int id)

        {

            var response = Get(UriAddress(id));

            if (response.IsSuccessStatusCode)

            {

               return await response.Content.ReadAsAsync<Person>();            

            }

            else

            {

                throw new HttpClientException(response);

            }

        }

 

4. Update

 

        public async Task<bool> UpdateAsync(Person person)

        {

            var putUri = UriAddress(person.Id);        

            Debug.WriteLine(putUri);

            HttpResponseMessage response = await PutAsJsonAsync<Person>(putUri, person);

            return response.IsSuccessStatusCode;

        }

 

5. Delete

 

public async Task DeleteAsync(int id)

        {

            await base.DeleteAsync(UriAddress(id));

        }

 

 

The constructor of the class is looks like the following:

 

 

public PersonManager(string baseAddress)

            : base(baseAddress)

        {

        }

 

I have a few unit test cases for it, let me show you some:     

 

 

 

        [TestMethod]

        public void PersonManagerGetAsyncTest()

        {

            var target = new PersonManager(TestSettingsLocal.ServiceBaseAddress);

 

            var result = target.GetAsync().Result;

 

            Assert.IsNotNull(result);

 

            foreach (var p in result)

            {

                Debug.WriteLine(p.ToString());

            }

        }

 

        public void PersonManagerGetAsyncByIdTest()

        {

            var target = new PersonManager(TestSettingsLocal.ServiceBaseAddress);

 

            var result = target.GetAsync(1).Result;

 

            Assert.AreEqual("Peter", result.FirstName);

            Assert.AreEqual("Lu", result.LastName);

 

        }

 

You might notice that the code here is very simple, it does not even have HTTP related code. Well the code here is simple is because there is a base class does all the heavy lifting behind the scene. This is how the class is defined.

 

 public class MyServiceProxy : ProxyBase

{

}

 

 

For these who are interested to see how ProxyBase is written, please drop me an email, I will send you the source code for the base class.