使用 Swashbuckle 生成 Swagger 文檔時如何將泛型替換為具體類型？

Question

我的動作裝飾有：

[ProducesResponseType(typeof(ValidationException<ErrorEnum>), StatusCodes.Status400BadRequest)]

我需要將生成的響應更改為不同的類型。 所以我添加了一個操作過濾器：

public class ValidationExceptionFilter : IOperationFilter
{
    public void Apply(OpenApiOperation operation, OperationFilterContext context)
    {
        if (context.ApiDescription.ActionDescriptor is ControllerActionDescriptor cad)
        {
            var returnType = cad.MethodInfo.ReturnType;
            if (returnType.IsGenericType && returnType.GetGenericTypeDefinition() == typeof(ValidationException<>))
            {
                var schema = context.SchemaGenerator.GenerateSchema(typeof(ValidationExceptionDto), context.SchemaRepository);
                foreach (var item in operation.Responses["400"].Content)
                    item.Value.Schema = schema;
            }
        }
    }
}

但是生成 swagger json 時通用類型沒有被替換。我在這里缺少什么？

Answer 1

使用此行，您將獲得方法的返回類型：

var returnType = cad.MethodInfo.ReturnType;

例如，A controller 像：

[HttpGet]
[ProducesResponseType(400, Type = typeof(Some<WeatherForecast>))]
[ProducesResponseType(200, Type = typeof(WeatherForecast))]
public IEnumerable<WeatherForecast> Get()
{   
.......
}

您將獲得 IEnumerable WeatherForecast 類型，而不是 Some 或 WeatherForecast 類型

我試圖在方法上獲取 ProducesResponseTypeAttribute 並訪問 Type 屬性：

    public class ValidationExceptionFilter : IOperationFilter    
    {        
        public void Apply(OpenApiOperation operation, OperationFilterContext context)        
        {            
        if (context.ApiDescription.ActionDescriptor is ControllerActionDescriptor cad)            
        {                
        var attrs=cad.MethodInfo.GetCustomAttributes(typeof(ProducesResponseTypeAttribute),true);                
        foreach(var attr in attrs)              
        {                   
          if((attr as ProducesResponseTypeAttribute).Type.IsGenericType&& (attr as ProducesResponseTypeAttribute).Type.GetGenericTypeDefinition()==typeof(Some<>))                    {                       
         var schema = context.SchemaGenerator.GenerateSchema(typeof(SomeDto), context.SchemaRepository);                        
        foreach (var item in operation.Responses["400"].Content)                            
        item.Value.Schema = schema;                    
        }                
      }            
     }        
   }    
 }

響應類型已修改：

json文件：