引言
相信巨硬，我们便一直硬。Net版本到现在已经出了7了，8也已经在预览版了，相信在一个半月就会正式发布，其中也有很多拭目以待的新功能了，不仅仅有Apm和Tap的结合，TaskToAscynResult，以及UnsafeAccessor用来获取私有变量，性能比反射,EMIT更高，还有针对AsyncLocal封装的IAsyncContext，IAsyncState，用来存异步上下文的一些数据，当然了，最让我期待的还是自带了一个OpenFeign，在看新增的东西的时候，其他的都觉得一般般，个人觉得哈，当看到这个AutoClient新增的包的时候，好奇心的驱使下，我点进去看了一下，哇，官网终于出这玩意了，使用简单，根据特性，然后使用Sg来生成我们对应的实现从而我们只需要定义一个接口，打上特性，就可以生成一个对应的代理类，调用远程Api接口，太令人心动，为此特地升级了VS，下载了Net8，体验新功能，接下来，我们就看看他的使用案例。附官网链接:https://learn.microsoft.com/zh-cn/dotnet/api/microsoft.extensions.http.autoclient.autoclientattribute?view=dotnet-plat-ext-8.0
AutoClient
在使用自带的OpenFeign的时候，我们还需要下载一个扩展包 Microsoft.Extensions.Http.AutoClient，当然还有 Microsoft.Extensions.Http的扩展包了，接下来我们定义一个接口，IBussiness，打上AutoClient特性，第一个参数是我们在注入Httpclient的时候，给的名字，我这里叫TestApi，这里会根据使用了AutoClient特性自定生成一个BussIness的类，在下图可以看到，自动生成了一个AutoClient.g.cs文件，里面的类就是Bussiness，其中包括了我们的TestPost方法以及路由信息，在上面的代码中，我们使用了Post特性，代表我们这个是Post请求，以及方法参数限制必须有一个CancellationToken，这个Post里面的内容，就是我另外一个项目种的接口地址。
builder.Services.AddHttpClient("TestApi",s=>s.BaseAddress=new Uri(" http://localhost:5062"));
[AutoClient( Task<>
// <auto-generated/>#nullable enable#pragma warning disable CS1591 // Compensate for https://github.com/dotnet/roslyn/issues/54103namespace WebApplication1.Api
{
[global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.Gen.AutoClient", "8.0.0.0")] public class Bussiness : IBussiness
{ private static class Statics
{ public static readonly global::System.Net.Http.Headers.MediaTypeHeaderValue ApplicationJsonHeader = new("application/json")
{
CharSet = global::System.Text.Encoding.UTF8.WebName
}; public static readonly global::System.Net.Http.Headers.MediaTypeHeaderValue TextPlainHeader = new("text/plain")
{
CharSet = global::System.Text.Encoding.UTF8.WebName
}; public static readonly global::System.Uri UriTestPost = new("/Test/TestPost", global::System.UriKind.Relative); public static readonly global::Microsoft.Extensions.Http.Telemetry.RequestMetadata RequestMetadataTestPost = new()
{
DependencyName = "Bussiness",
RequestName = "TestPost",
RequestRoute = "/Test/TestPost"
};
} private readonly global::System.Net.Http.HttpClient _httpClient; private readonly global::Microsoft.Extensions.Http.AutoClient.AutoClientOptions _autoClientOptions; public Bussiness(global::System.Net.Http.HttpClient httpClient, global::Microsoft.Extensions.Http.AutoClient.AutoClientOptions autoClientOptions)
{
_httpClient = httpClient;
_autoClientOptions = autoClientOptions;
} public async global::System.Threading.Tasks.Task<string> TestPost(global::System.Threading.CancellationToken cancellationToken)
{ var httpRequestMessage = new global::System.Net.Http.HttpRequestMessage()
{
Method = global::System.Net.Http.HttpMethod.Post,
RequestUri = Statics.UriTestPost,
}; try
{ global::Microsoft.Extensions.Telemetry.TelemetryExtensions.SetRequestMetadata(httpRequestMessage, Statics.RequestMetadataTestPost); return await SendRequest<string>("Bussiness", Statics.RequestMetadataTestPost.RequestRoute, httpRequestMessage, cancellationToken)
.ConfigureAwait(false);
} finally
{
httpRequestMessage.Dispose();
}
} private async global::System.Threading.Tasks.Task<TResponse> SendRequest<TResponse>( string dependencyName, string path, global::System.Net.Http.HttpRequestMessage httpRequestMessage, global::System.Threading.CancellationToken cancellationToken) where TResponse : class
{ var response = await _httpClient.SendAsync(httpRequestMessage, cancellationToken).ConfigureAwait(false); if (typeof(TResponse) == typeof(global::System.Net.Http.HttpResponseMessage))
{ return (response as TResponse)!;
} try
{ if (!response.IsSuccessStatusCode)
{ var error = await global::Microsoft.Extensions.Http.AutoClient.AutoClientHttpError.CreateAsync(response, cancellationToken).ConfigureAwait(false); throw new global::Microsoft.Extensions.Http.AutoClient.AutoClientException(global::System.FormattableString.Invariant($"The '{dependencyName}' HTTP client failed with '{response.StatusCode}' status code."), path, error);
} if (typeof(TResponse) == typeof(string))
{#if NET5_0_OR_GREATER var rawContent = await response.Content.ReadAsStringAsync(cancellationToken).ConfigureAwait(false);#else
cancellationToken.ThrowIfCancellationRequested(); var rawContent = await response.Content.ReadAsStringAsync().ConfigureAwait(false);#endif
return (rawContent as TResponse)!;
} var mediaType = response.Content.Headers.ContentType?.MediaType; if (mediaType == "application/json")
{ var deserializedResponse = await global::System.Net.Http.Json.HttpContentJsonExtensions.ReadFromJsonAsync<TResponse>(response.Content, _autoClientOptions.JsonSerializerOptions, cancellationToken)
.ConfigureAwait(false); if (deserializedResponse == null)
{ var error = await global::Microsoft.Extensions.Http.AutoClient.AutoClientHttpError.CreateAsync(response, cancellationToken).ConfigureAwait(false); throw new global::Microsoft.Extensions.Http.AutoClient.AutoClientException(global::System.FormattableString.Invariant($"The '{dependencyName}' REST API failed to deserialize response."), path, error);
} return deserializedResponse;
} var err = await global::Microsoft.Extensions.Http.AutoClient.AutoClientHttpError.CreateAsync(response, cancellationToken).ConfigureAwait(false); throw new global::Microsoft.Extensions.Http.AutoClient.AutoClientException(global::System.FormattableString.Invariant($"The '{dependencyName}' REST API returned an unsupported content type ('{mediaType}')."), path, err);
} finally
{
response.Dispose();
}
}
}
[global::System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.Gen.AutoClient", "8.0.0.0")] public static class AutoClientsExtensions
{ public static global::Microsoft.Extensions.DependencyInjection.IServiceCollection AddBussiness(this global::Microsoft.Extensions.DependencyInjection.IServiceCollection services)
{ return services.AddBussiness(_ => { });
} public static global::Microsoft.Extensions.DependencyInjection.IServiceCollection AddBussiness( this global::Microsoft.Extensions.DependencyInjection.IServiceCollection services, global::System.Action<global::Microsoft.Extensions.Http.AutoClient.AutoClientOptions> configureOptions)
{ global::Microsoft.Extensions.DependencyInjection.OptionsServiceCollectionExtensions.AddOptionsWithValidateOnStart<global::Microsoft.Extensions.Http.AutoClient.AutoClientOptions, global::Microsoft.Extensions.Http.AutoClient.AutoClientOptionsValidator>(services, "Bussiness").Configure(configureOptions); global::Microsoft.Extensions.DependencyInjection.Extensions.ServiceCollectionDescriptorExtensions.TryAddSingleton<IBussiness>(services, provider =>
{ var httpClient = global::Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService<global::System.Net.Http.IHttpClientFactory>(provider).CreateClient("TestApi"); var autoClientOptions = global::Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService<global::Microsoft.Extensions.Options.IOptionsMonitor<global::Microsoft.Extensions.Http.AutoClient.AutoClientOptions>>(provider).Get("Bussiness"); return new Bussiness(httpClient, autoClientOptions);
}); return services;
}
}
}
下面这段代码，是我另一个项目接口的代码，可以看到，路由是Test，方法的路由是TestPost，返回了一个字符串true，因为，在使用AutoClient的时候，返回类型必须是引用类型，接下来，我们调用一下测试看看，在返回的结果中，我们可以看到返回了我们在另一个项目中返回的结果，true，同时，AutoClient还支持Get,Patch，Delete，Get，Put，Body（标记是在Body中），Header，Query等诸多特性，就是一个c#版本的OpenFeign，简直爽的不要不要的。
[Route("Test")]public class TestController : ControllerBase
{ public TestController()
{
}
[HttpPost("TestPost")] public Task<string> TestPost()
{
return Task.FromResult("true");
}
}
