.Net 7 HttpClient 送出 JSON要求並接收 json 回應

紀錄 PostAsJsonAsync, ReadFromJsonAsync 與 record 型別

參考型別 record

public record AuthResult(
    [property: JsonPropertyName("access_token")]
    string AccessToken,
    [property: JsonPropertyName("expires_in")]
    int ExpiresIn,
    [property: JsonPropertyName("token_type")]
    string TokenType
);

PostAsJsonAsync & ReadFromJsonAsync

private readonly HttpClient _httpClient;

public AuthService(HttpClient httpClient)
{
    _httpClient = httpClient;
}

public async Task<AuthResult> GetAccessTokenAsync()
{
    var response = await _httpClient.PostAsJsonAsync("oauth/token", new
        {
            grant_type = "client_credentials",
            client_id = "client_id",
            client_secret = "client_secret"
        }
    );

    response.EnsureSuccessStatusCode();

    var result = await response.Content.ReadFromJsonAsync<AuthResult>();

    return result;
}

private void ConfigureHttpClient(ServiceConfigurationContext context, IConfiguration configuration)
{
    context.Services.AddHttpClient<IAuthService, AuthService>(opt =>
    {
        var baseAddress = configuration.GetSection(nameof(AuthService))[nameof(opt.BaseAddress)];
        if (Uri.TryCreate(baseAddress, UriKind.Absolute, out var uri))
        {
            opt.BaseAddress = uri;
        }
    });
}

Test

[Fact]
public async Task Should_Get_AccessToken_From_AuthService()
{
    var authService = GetRequiredService<AuthService>();

    //Act
    var result = await authService.GetAccessTokenAsync();

    //Assert
    result.ShouldNotBeNull();
    result.AccessToken.ShouldNotBeNull();
}

PS5

.Net Core
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13 October 2025