Question

我正在设计一个ASP.Net Webapi 2解决方案，该解决方案可能会从[Frombody]接收请求消息的一种形式，如下所示。

我应该如何设计将绑定到传入请求消息的具体类？任何建议将不胜感激。

<?xml version="1.0" encoding="utf-8"?>
<RequestMessage>
  <Shapes>
    <RectangleInfo></RectangleInfo>
  </Shapes>
</RequestMessage>

or

<RequestMessage>
  <Shapes>
    <CicleInfo></CicleInfo>
  </Shapes>
</RequestMessage>

or

<RequestMessage>
  <Shapes>
    <SquareInfo></SquareInfo>
  </Shapes>
</RequestMessage>

Answer 1

请考虑使用ModelBinder接口并返回正确类型的IShape：RectangleShape，CicleShape或SquareShape。完成后，您的控制器方法将如下所示：

    public Task<HttpResponseMessage> GetShape(
        [ModelBinder] IShape shape = null) { ... }

您的资料夹看起来像

using System;
using System.Net;
using System.Web.Http.Controllers;
using System.Web.Http.ModelBinding;

/// <summary>Web API ModelBinder for Shape.</summary>
/// <example>
/// At service startup include:
/// config.Services.Insert(typeof(ModelBinderProvider), 0, new SimpleModelBinderProvider(typeof(IShape), new ShapeBinder()));
/// <br/>
/// On controller methods that need a IShape
/// public async Task<HttpResponseMessage> SomeMethod([ModelBinder] IShape shape)
/// </example>
public class ShapeBinder : IModelBinder
{
    /// <summary>Create a Shape.</summary>
    /// <returns>true if a valid shape .  false otherwise.</returns>
    public bool BindModel(HttpActionContext actionContext, ModelBindingContext bindingContext)
    {
        if (bindingContext.ModelType == typeof(IShape))
        {
            return CreateShape(actionContext, bindingContext);
        }

        return false;
    }

您的班级层次结构将类似于

     public abstract class Shape : IShape { .. properties for all shapes ... }
     public class SquareShape : RectangleShape { ... special case rectangle syntactic sugar that makes it a square ... }
     public class RectangleShape : Shape { ... rectangle properties }
     public class CicleShape : Shape { ... cicle properties }

您甚至有一天可能会添加

     public class CircleShape : EllipseShape { ... circle special case of ellipse properties ... }
     public class EllipseShape : Shape { ... ellipse properties ... }

也许答案与您所想的不同，但是您说了Any suggestion，这可能会为您提供很好的服务。

WebApi2 FromBody RequestMessage不同类型

1 个答案: