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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
如標題所說
TypeScript模型
export interface RigheOrdiniBuoniSpesaData {
id: number;
id_ordine: number;
id_taglio_buono_spesa: number;
quantita: number;
}
這是另一個更大對象的一部分:
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)
);
}
訂單json(有效的Json)在Chrome請求捕獲中與所有數據一起清晰可見:
[{"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; }
}
哪個在
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;}
}
(我也嘗試過用列表代替無數的方式,仍然沒有運氣!)
api控制器簽名:
[HttpPost]
public async Task<IActionResult> PostSaveOrder([FromForm] OrdiniBuoniSpesaViewModel model)
{.....code}
除righe_ordine數組外,所有字段均已正確綁定! 我可以正確看到每個字段,但是數組的計數為0。
足夠奇怪的是,如果我在Visual Studio中的QuickWatch調試中檢查了ASP網絡請求對象(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
存在並正確填充.....但是由於某種原因將其綁定到OrdiniBuoniSpesaViewModel失敗。
我究竟做錯了什么? 任何想法?
編輯:
目前,我發現的唯一解決方案是在進入控制器后直接捕獲該值:
string righeJson = this.Request.Form["righe_ordine"].ToString();
if(!string.IsNullOrEmpty(righeJson))
model.righe_ordine = JsonConvert.DeserializeObject<IEnumerable<RigheOrdiniBuoniSpesaViewModel>>(righeJson);
我認為您需要像這樣更改型號名稱
在你的js代碼中
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:只是為了增強
也許您需要先解析它,然后才能在控制器中使用它
你可以在這里閱讀我的完整代碼
我們將需要創建接口和類來實現它。
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>();
}
}
然后注冊
services.AddScoped(typeof(IJsonParseService<>), typeof(JsonParseService<>));
所以你的代碼應該是這樣的
private readonly IJsonParseService<RigheOrdiniBuoniSpesaViewModel> _jsonParsePostOptionDefaultVm;
jsonParsePostOptionDefaultVm.ToObject(viewModel.RigheOrdiniBuoniSpesaViewModel);
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