c# - 如何使用aspnet ApiVersioning在Swashbuckle中配置MultipleApiVersions

如何将swashbuckle配置为使用Aspnet APIVerisoning？
https://github.com/Microsoft/aspnet-api-versioning
在我的Startup.cs中，我有以下代码来初始化基于属性的路由、api版本控制和swagger。

var constraintResolver = new DefaultInlineConstraintResolver()
{
    ConstraintMap =
    {
        ["apiVersion"] = typeof( ApiVersionRouteConstraint )
    }
};
config.MapHttpAttributeRoutes(constraintResolver);
config.AddApiVersioning();

config.EnableSwagger(c =>
{
    c.MultipleApiVersions(
        (apiDesc, targetApiVersion) => ResolveVersionSupportByRouteConstraint(apiDesc, targetApiVersion),
        (vc) =>
        {
            vc.Version("v1", "Swashbuckle Dummy API V1");
            vc.Version("v2", "Swashbuckle Dummy API V2");
        });
}



public static bool ResolveVersionSupportByRouteConstraint(ApiDescription apiDesc, string targetApiVersion)
{
    var versionConstraint = (apiDesc.Route.Constraints.ContainsKey("apiVersion"))
        ? apiDesc.Route.Constraints["apiVersion"] as RegexRouteConstraint
        : null;

    return (versionConstraint == null)
        ? false
        : versionConstraint.Pattern.Split('|').Contains(targetApiVersion);
}

当resolveversionsupportbyrouteconstraintmethod激发时，路由模板包含文本api字符串“api/v{version}/users”我的用户控制器用[apiversion（“1.0”）]修饰，并且我定义了以下路由[route（“api/v{version:apiversion}/users”）]。当我用postman访问api/v1/users时，这个调用是有效的，但是我不知道如何使用swashbuck/swagger来实现这个功能。
我希望我的夸大其词的文档看起来像asp.net core api样板文件的示例，只是我将owin与owin startup类一起使用，而不是使用.net core:https://github.com/ASP-NET-Core-Boilerplate/Templates/blob/master/MVC%206%20API.md

最佳答案

您可以找到here
这就是我在启动自托管owin应用程序时所做的：

public void Configuration(IAppBuilder appBuilder)
    {
        HttpConfiguration config = new HttpConfiguration();
        //configure your app

        config.AddApiVersioning(o =>
        {
            o.ReportApiVersions = true;
            o.ApiVersionReader = new UrlSegmentApiVersionReader();
        });
        var constraintResolver = new DefaultInlineConstraintResolver()
        {
            ConstraintMap = { ["apiVersion"] = typeof(ApiVersionRouteConstraint) }
        };
        config.MapHttpAttributeRoutes(constraintResolver);
        SwaggerConfiguration.Configure(config);
        appBuilder.UseWebApi(config);
    }

swagger的配置非常简单，这里的主要部分是versionedappiexplorer（确保您传递了正确的api groupnameformat，我的格式是v1、v2等）：

public static class SwaggerConfiguration
{
    public static void Configure(HttpConfiguration config)
    {
        var apiExplorer = config.AddVersionedApiExplorer(o => o.GroupNameFormat = "'v'V");
        config.EnableSwagger(
                swagger =>
                {
                    swagger.MultipleApiVersions(
                        (apiDesc, targetApiVersion) => apiDesc.GetGroupName() == targetApiVersion,
                        versionBuilder =>
                        {
                            foreach (var group in apiExplorer.ApiDescriptions)
                            {
                                var description = "";
                                if (group.IsDeprecated) description += "This API deprecated";

                                versionBuilder.Version(group.Name, $"Service API {group.ApiVersion}")
                                    .Description(description);
                            }
                        });
                    swagger.DocumentFilter<VersionFilter>();
                    swagger.OperationFilter<VersionOperationFilter>();
                })
            .EnableSwaggerUi(cfg => cfg.EnableDiscoveryUrlSelector());
    }

在控制器中添加属性apiversion和routeprefix

[ApiVersion("1")]
[RoutePrefix("api/v{version:apiVersion}/history")]
public class HistoryController: ApiController

如果您对versionfilter和versionoperationfilter感到困惑，那么这里有相应的代码。这个过滤器修改swagger中的结果路由和参数（如果没有这个过滤器，路由将看起来像/v{version}/{actionname}，并且包含必需的参数version）

public class VersionFilter : IDocumentFilter
{
    public void Apply(SwaggerDocument swaggerDoc, SchemaRegistry schemaRegistry, IApiExplorer apiExplorer)
    {
        swaggerDoc.paths = swaggerDoc.paths
            .ToDictionary(
                path => path.Key.Replace("v{version}", swaggerDoc.info.version),
                path => path.Value
            );
    }
}
public class VersionOperationFilter : IOperationFilter
{
    public void Apply(Operation operation, SchemaRegistry schemaRegistry, ApiDescription apiDescription)
    {
        var version = operation.parameters?.FirstOrDefault(p => p.name == "version");
        if (version != null)
        {
            operation.parameters.Remove(version);
        }
    }
}