C# 可选参数导致Swashback.AspNetCore中出现null异常

我有一个

asp.net core 2.0

api控制器操作，带有一个可选（且可为空）参数

Swashback.AspNetCore 1.0.0

当此参数出现在方法签名中时，生成Swagger文档失败，但如果我将其从签名中删除，则生成成功。看起来可选参数是错误的原因，但我不知道为什么

我正在使用Swashback与aspnet api版本控制的集成：

控制器动作：

[HttpGet("{id}")]
public IActionResult GetPerson(int id, [FromQuery] bool? includeContactInfo = null)
{
    var includeInfo = (includeContactInfo.HasValue && includeContactInfo.Value == true);
    var person = _repo.GetPerson(id, includeInfo);
    if (person == null)
    {
        return NotFound();
    }

    if (includeInfo)
    {
        // using AutoMapper to map between entity and dto
        var personFullDto = Mapper.Map<PersonFullDto>(person);
        return Ok(personFullDto);
    }

    var personBasicDto = Mapper.Map<PersonBasicDto>(person);
    return Ok(personBasicDto);
}

我还使用了来自的SwaggerDefaultValues.cs类

当我检查

description

对象的

includeContactInfo

可选/查询参数时，

description.RouteInfo

为空

错误消息：

Object reference not set to an instance of an object.

堆栈跟踪：

at ContactsApp.Services.SwaggerDefaultValues.Apply(Operation operation, OperationFilterContext context) in C:\Users\me\Documents\Visual Studio 2017\Projects\ContactsApp\ContactsApp\Services\SwaggerDefaultValues.cs:line 37
at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.CreateOperation(ApiDescription apiDescription, ISchemaRegistry schemaRegistry)
at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.CreatePathItem(IEnumerable`1 apiDescriptions, ISchemaRegistry schemaRegistry)
at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GetSwagger(String documentName, String host, String basePath, String[] schemes)
at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.<Invoke>d__6.MoveNext()

在C:\Users\me\Documents\Visual Studio 2017\Projects\ContactsApp\ContactsApp\Services\SwaggerDefaultValues.Apply中的ContactsApp.Services.SwaggerDefaultValues.Apply（操作操作，操作过滤器上下文）中
在swashbucklk.AspNetCore.swagggergen.swagggergenerator.CreateOperation（APISHEMARegistry schemaRegistry和APISHEMARegistry schemaRegistry）
位于swashback.AspNetCore.SwaggerGen.SwaggerGenerator.CreatePathItem（IEnumerable`1 apiDescriptions，ISchemaRegistry schemaRegistry）
在System.Linq.Enumerable.ToDictionary[TSource，TKey，TElement]（IEnumerable`1源，Func`2键选择器，Func`2元素选择器，IEqualityComparer`1比较器）
位于swashback.AspNetCore.SwaggerGen.SwaggerGenerator.GetSwagger（String documentName、String host、String basePath、String[]schemes）
在swashback.AspNetCore.Swagger.Swagger.d_u6.MoveNext（）中

使用空条件运算符：

parameter.Default = description.RouteInfo?.DefaultValue;

---

使用空条件运算符：

parameter.Default = description.RouteInfo?.DefaultValue;

at ContactsApp.Services.SwaggerDefaultValues.Apply(Operation operation, OperationFilterContext context) in C:\Users\me\Documents\Visual Studio 2017\Projects\ContactsApp\ContactsApp\Services\SwaggerDefaultValues.cs:line 37
at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.CreateOperation(ApiDescription apiDescription, ISchemaRegistry schemaRegistry)
at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.CreatePathItem(IEnumerable`1 apiDescriptions, ISchemaRegistry schemaRegistry)
at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable`1 source, Func`2 keySelector, Func`2 elementSelector, IEqualityComparer`1 comparer)
at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GetSwagger(String documentName, String host, String basePath, String[] schemes)
at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.<Invoke>d__6.MoveNext()

parameter.Default = description.RouteInfo?.DefaultValue;