在WebApi 2中检测到属性的自引用循环。
在WebApi 2中检测到属性的自引用循环。
我创建了一个WebApi来将新产品和评论保存到数据库中。以下是WebApi的代码：
POST api/Products
[ResponseType(typeof(Product))]
public IHttpActionResult PostProduct(Product product)
{
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
db.Products.Add(product);
db.SaveChanges();
return CreatedAtRoute("DefaultApi", new { id = product.ProductId }, product);
}
Product类
public class Product
{
public int ProductId { get; set; }
[Required]
public string Name { get; set; }
public string Category { get; set; }
public int Price { get; set; }
//导航属性
public ICollection Reviews { get; set; }
}
Review类
public class Review
{
public int ReviewId { get; set; }
public int ProductId { get; set; }
[Required]
public string Title { get; set; }
public string Description { get; set; }
//导航属性
public Product Product { get; set; }
}
我正在使用谷歌浏览器扩展程序“POSTMAN”来测试该api。当我尝试通过在POSTMAN中创建一个POST请求来保存详细信息时：
{
"Name": "Product 4",
"Category": "Category 4",
"Price": 200,
"Reviews": [
{
"ReviewId": 1,
"ProductId": 1,
"Title": "Review 1",
"Description": "Test review 1",
"Product": null
},
{
"ReviewId": 2,
"ProductId": 1,
"Title": "Review 2",
"Description": "Test review 2",
"Product": null
}
]
}
出现以下错误：
"Message":"An error has occurred.",
"ExceptionMessage":"The 'ObjectContent`1' type failed to serialize the response body for content type 'application/json; charset=utf-8'.",
"ExceptionType":"System.InvalidOperationException",
"StackTrace":null,
"InnerException":{
"Message":"An error has occurred.",
"ExceptionMessage":"Self referencing loop detected for property 'Product' with type 'HelloWebAPI.Models.Product'.
如何解决这个错误？