ASP.Net WEB API 2.0中基于属性的路由/版本控制

Question

我正在尝试在Asp.Net Web API中使用版本控制。以下是项目的结构。

为了支持版本控制，我添加了Microsoft.AspNet.WebApi.Versioning NuGet程序包。以下是WebApiConfig的代码段：

    public static void Register(HttpConfiguration config)
    {
        var constraintResolver = new DefaultInlineConstraintResolver()
        {
            ConstraintMap =
            {
                ["apiVersion"] = typeof(ApiVersionRouteConstraint)
            }
        };
        config.MapHttpAttributeRoutes(constraintResolver);
        config.AddApiVersioning();
        // Web API configuration and services

        // Web API routes
        //config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );
    }

下面是控制器的代码：

[ApiVersion("1.0")]
[RoutePrefix("api/v{version:apiVersion}/employeemanagement")]
public class EmployeeManagementController : ApiController
{
    [Route("GetTest")]
    [HttpGet]
    public string GetTest()
    {
        return "Hello World";
    }

    [Route("GetTest2")]
    [HttpGet]
    public string GetTest2()
    {
        return "Another Hello World";
    }

    [Route("saveemployeedata")]
    [HttpPost]
    public async Task<GenericResponse<int>> SaveEmployeeData(EmployeeData employeeData, ApiVersion apiVersion)
    {
        //code goes here
    }

    [Route("updateemployeedata")]
    [HttpPost]
    public async Task<GenericResponse<int>> UpdateEmployeeData([FromBody]int id, ApiVersion apiVersion)
    {
        //code goes here            
    }
}

如果我在UpdateEmployeeData中使用[FromBody]，则会出现以下错误：

{
"Message": "The request is invalid.",
"MessageDetail": "The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Threading.Tasks.Task`1[AlphaTest.API.Models.ResponseModels.GenericResponse`1[System.Int32]] UpdateEmployeeData(Int32, Microsoft.Web.Http.ApiVersion)' in 'AlphaTest.API.Controllers.V1.EmployeeManagementController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter."
}

以下是URL和数据，我正在传递以生成上述错误：http://localhost:53963/api/v1.0/EmployeeManagement/updateemployeedata

如果我删除[FromBody]，它会给我404找不到错误。

[请帮助我了解我在这里做错了，这导致上述错误。

Answer 1

您可以使用包含名为Id的属性的object作为操作UpdateEmployeeData的parameter而不是直接int Id，例如：

public class Request
{
    public int Id { get; set; }
}

动作将是：

[Route("updateemployeedata")]
[HttpPost]
public async Task<GenericResponse<int>> UpdateEmployeeData([FromBody]Request request, ApiVersion apiVersion)
{
    //code goes here            
}

希望您能找到帮助。