Can you create HttpClient read-only property and re-use it in your methods?

Question

Is there any issue with below implementation inside Blazor component? A lot of examples repeatedly use CreateClient inside every method and I am wondering if it can be handled by a property, in one place to avoid repetition.

@inject IHttpClientFactory ClientFactory

@code{
    private HttpClient Client => ClientFactory.CreateClient("api");
    private object myData;

    private async Task GetData()
    {
        myData = await Client.GetFromJsonAsync<MyClass>("endpoint");
    }
}

"Is there any issue with below implementation inside Blazor component?" From a design standpoint, you're piling all your data access into your component. Your component has lots of responsibilities. It's getting the data, managing the data and displaying the data: there's no "Separation of Concerns." If you're Ok with that, continue. — MrC aka Shaun Curtis
– MrC aka Shaun Curtis, Commented Jan 11, 2023 at 18:06
@MrCakaShaunCurtis how instead should I write component that displays data from the api? — Pawel
– Pawel, Commented Jan 11, 2023 at 19:06
@Pawel - ideally move the code to access the API into a typed HttpClient (see learn.microsoft.com/en-us/dotnet/architecture/microservices/… ... Then that typed client can hide the API access and deserialization into required types, e.g. MyClass. — Neil W
– Neil W, Commented Jan 11, 2023 at 20:11

Neil W · Accepted Answer · 2023-01-11 17:54:31Z

1

Your code is fine.

The HttpClientFactory will take care of disposal of HttpMessageHandlers.

The => syntax essentially means that you've created an Alias (left-hand side) for running code (right-hand side).

In other words, you ARE calling CreateClient inside every method, except you've made your life a little easier by using an Alias Client.

answered Jan 11, 2023 at 17:54

Neil W

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