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[英]ASP.NET Core - Bind IEnumerable<T> to a ViewModel field on POST
[英]Angular 8 post formData to ASP.NET Core API cannot bind IEnumerable/List
如标题所说
TypeScript模型
export interface RigheOrdiniBuoniSpesaData {
id: number;
id_ordine: number;
id_taglio_buono_spesa: number;
quantita: number;
}
这是另一个更大对象的一部分:
export class OrdiniBuoniSpesaData {
id: number;
// OTHER FIELD
// OTHER FIELD
// OTHER FIELD
righe_ordine: RigheOrdiniBuoniSpesaTableData;
}
保存方式
saveOrder(model: OrdiniBuoniSpesaData) {
const headerPost: HttpHeaders = new HttpHeaders();
headerPost.set('Content-type', 'application/x-www-form-urlencoded');
const formData: FormData = new FormData();
formData.append('id_cliente', model.id_cliente.toString());
// VARIOUS FORM FIELDS
//THIS IS ARRAY DATA
formData.append('righe_ordine', JSON.stringify(model.righe_ordine));
return this.http
.post<boolean>(
requestURL,
formData,
{ headers: headerPost }
)
.pipe(
catchError(this.handleError)
);
}
订单json(有效的Json)在Chrome请求捕获中与所有数据一起清晰可见:
[{"id":0,"id_ordine":0,"id_taglio_buono_spesa":1,"quantita":1},{"id":0,"id_ordine":0,"id_taglio_buono_spesa":1,"quantita":1},{"id":0,"id_ordine":0,"id_taglio_buono_spesa":1,"quantita":1},{"id":0,"id_ordine":0,"id_taglio_buono_spesa":3,"quantita":14}]
在API方面
JSON的接收模型
public class RigheOrdiniBuoniSpesaViewModel
{
public long id { get; set; }
public long id_ordine { get; set; }
public long id_taglio_buono_spesa { get; set; }
public int quantita { get; set; }
}
哪个在
public class OrdiniBuoniSpesaViewModel
{
public long id { get; set; }
//OTHER VARIOUS FIELDS
//I TRIED ALSO WITH LIST INSTEAD OF IENUMERABLE
public IEnumerable<RigheOrdiniBuoniSpesaViewModel> righe_ordine {get;set;}
}
(我也尝试过用列表代替无数的方式,仍然没有运气!)
api控制器签名:
[HttpPost]
public async Task<IActionResult> PostSaveOrder([FromForm] OrdiniBuoniSpesaViewModel model)
{.....code}
除righe_ordine数组外,所有字段均已正确绑定! 我可以正确看到每个字段,但是数组的计数为0。
足够奇怪的是,如果我在Visual Studio中的QuickWatch调试中检查了ASP网络请求对象(this.Request.Form):
this.Request.Form["righe_ordine"]
{[{"id":0,"id_ordine":0,"id_taglio_buono_spesa":1,"quantita":1},
{"id":0,"id_ordine":0,"id_taglio_buono_spesa":1,"quantita":1},
{"id":0,"id_ordine":0,"id_taglio_buono_spesa":1,"quantita":1},
{"id":0,"id_ordine":0,"id_taglio_buono_spesa":3,"quantita":14}]}
Microsoft.Extensions.Primitives.StringValues
存在并正确填充.....但是由于某种原因将其绑定到OrdiniBuoniSpesaViewModel失败。
我究竟做错了什么? 任何想法?
编辑:
目前,我发现的唯一解决方案是在进入控制器后直接捕获该值:
string righeJson = this.Request.Form["righe_ordine"].ToString();
if(!string.IsNullOrEmpty(righeJson))
model.righe_ordine = JsonConvert.DeserializeObject<IEnumerable<RigheOrdiniBuoniSpesaViewModel>>(righeJson);
我认为您需要像这样更改型号名称
在你的js代码中
formData.append('righeOrdine', JSON.stringify(model.righe_ordine));
和C#
public class OrdiniBuoniSpesaViewModel
{
public long id { get; set; }
//OTHER VARIOUS FIELDS
//I TRIED ALSO WITH LIST INSTEAD OF IENUMERABLE
public IEnumerable<RigheOrdiniBuoniSpesaViewModel> RigheOrdine {get;set;}
}
更新:只是为了增强
也许您需要先解析它,然后才能在控制器中使用它
你可以在这里阅读我的完整代码
我们将需要创建接口和类来实现它。
public interface IJsonParseService<T> where T : class
{
T ToObject(string json);
}
public class JsonParseService<T> : IJsonParseService<T> where T : class
{
public T ToObject(string json)
{
return JObject.Parse(json).Root.ToObject<T>();
}
}
然后注册
services.AddScoped(typeof(IJsonParseService<>), typeof(JsonParseService<>));
所以你的代码应该是这样的
private readonly IJsonParseService<RigheOrdiniBuoniSpesaViewModel> _jsonParsePostOptionDefaultVm;
jsonParsePostOptionDefaultVm.ToObject(viewModel.RigheOrdiniBuoniSpesaViewModel);
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