生成器将在单个 Swagger 文档中包含所有 API 操作。但是，如有必要，您可以创建多个文档。例如，您可能希望每个 API 版本都有一个单独的文档。

案例

添加服务、中间件(v1、v2)

builder.Services.AddSwaggerGen(options =>
{
    //定义多个Swagger 文档
    options.SwaggerDoc("v1", new Microsoft.OpenApi.Models.OpenApiInfo()
    {
        Title = "v1 标题",
        Version = "v1"
    });
    options.SwaggerDoc("v2", new Microsoft.OpenApi.Models.OpenApiInfo()
    {
        Title = "v2 标题",
        Version = "v2"
    });
});

app.UseSwagger();
app.UseSwaggerUI(options => {
    options.SwaggerEndpoint("/swagger/v1/swagger.json", "v1~~~");
    options.SwaggerEndpoint("/swagger/v2/swagger.json", "v2~~~");
});

添加两个Controller，分别属于v1、v2：

namespace SwaggerVersion.Controllers.v1
{
    [ApiController]
    [Route("[controller]")]
    [ApiExplorerSettings(GroupName = "v1")]
    public class OrderController : ControllerBase
    {
        [HttpGet]
        public IEnumerable<string> Get()
        {
            return new string[] { "value1", "value2" };
        }
    }
}
namespace SwaggerVersion.Controllers.v2
{
    [ApiController]
    [Route("[controller]")]
    [ApiExplorerSettings(GroupName = "v2")]
    public class OrderController : ControllerBase
    {
        [HttpGet]
        public IEnumerable<string> Get()
        {
            return new string[] { "value1", "value2" };
        }
    }
}

按约定为文档分配操作

您可以连接以下约定以根据控制器命名空间进行分组，就不需要[ApiExplorerSettings]了

// ApiExplorerGroupPerVersionConvention.cs
public class ApiExplorerGroupPerVersionConvention : IControllerModelConvention
{
    public void Apply(ControllerModel controller)
    {
        var controllerNamespace = controller.ControllerType.Namespace; // e.g. "Controllers.V1"
        var apiVersion = controllerNamespace.Split('.').Last().ToLower();

        controller.ApiExplorer.GroupName = apiVersion;
    }
}

// Startup.cs
public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc(c =>
        c.Conventions.Add(new ApiExplorerGroupPerVersionConvention())
    );

    ...
}