ASP.NET Core 2.0 Web API从离子3接收/发送Json请求3

问题描述：

我有一个ASP.NET Core 2.0 Web API与离子3集成在一起。我在接收离子3应用程序发送的JSON数据时出现问题，这里是示例代码： -ASP.NET Core 2.0 Web API从离子3接收/发送Json请求3

import { Injectable } from '@angular/core'; 
import { Http, Headers } from '@angular/http'; 
import 'rxjs/add/operator/map'; 
import { AlertController, LoadingController } from 'ionic-angular'; 
import { FCM } from '@ionic-native/fcm'; 
@Injectable() 
export class ServerProvider { 
private baseurl = "http://localhost:9681/api"; 
private api: String[] = new Array(); 

public loader: any; 
constructor(public fcm: FCM, public http: Http, public alertCtrl: 
AlertController, public loadingCtrl: LoadingController) { 
this.api['auth'] = 'Authentication'; 
this.api['agency'] = 'Agencies'; 
this.api['user'] = 'Users'; 
this.api['route'] = 'Routes'; 
this.api['token'] = 'Tokens'; 
this.api['notification'] = 'Notifications'; 
this.api['salepoint'] = 'Salepoints'; 
} 

ServerRequest(api, request, data) { 
return new Promise((resolve) => { 
    let headers = new Headers(); 
    headers.append('Content-Type', 'application/json; charset=UTF-8'); 
    this.http.get(this.baseurl + "/" + this.api[api] + "/", {headers: headers}).map(res => res.json()).subscribe((result) => { 
    resolve(result); 
    console.log(result); 
    }, (error) => { 
    console.log(error); this.CreateAlert("Error", error, [ 
     { 
     text: 'Close', 
     handler:() => { 
      this.loader.dismiss(); 
     } 
     } 
    ]); 
    },() => { 
    this.loader.dismiss(); 
    }); 
}); 
}

后端： -

[Route("api/Authentication")] 
public class AuthenticationController : Controller 
{ 
    IConfiguration _configuration; 

    public AuthenticationController(IConfiguration configuration) 
    { 
     _configuration = configuration; 
    } 
    [HttpGet] 
    public JsonResult GetUser(JsonResult json) 
    { 
     AgencyUsers agencyusers = new AgencyUsers(_configuration); 
     return Json(agencyusers.GetUser(json)); 
    } 
}

我收到以下错误： -

An unhandled exception occurred while processing the request. InvalidOperationException: Could not create an instance of type 'Microsoft.AspNetCore.Mvc.JsonResult'. Model bound complex types must not be abstract or value types and must have a parameterless constructor.

接收（序列化和反序列化JSON）并发回JSON（数据或错误）的正确方法是什么？

你离子的应用程序实际上不发送任何数据。如果你想在你的请求中发送一些数据，那么'GET'是错误的请求类型。您应该在GET请求中包含参数到您的URL中（例如'http：//example.com/api/Authentication？id = 1'），或者对于具有JSON主体的请求，切换到'POST'或'PUT '而不是 –

谢谢，我对代码做了很多修改，现在它正在工作。 – Kuma

答

经过大量的挖掘和修改，我终于得到了API的正常工作。万一有人跑进我相似的问题，在这里我做了什么： -

在离子，我已经改变了从GET到POST HTTP请求。

ServerRequest(api, request, data) { 
return new Promise((resolve) => { 
let headers = new Headers(); 
headers.append('Content-Type', 'application/json; charset=UTF-8'); 
this.http.post(this.baseurl + "/" + this.api[api] + "/" + request, JSON.stringify(data),{headers:headers}).map(res => res.json()).subscribe((result) => { ... });}

在后端，使用newtonsoft（JObject）这救了我很多头JsonResult引起的，则改为方法类型IActionResult。

[HttpPost("GetAgencyUser")] 
public IActionResult GetAgencyUser([FromBody]JObject request) 
{ 
    try 
    { 
     if (request["id"] == null) 
     { 
      return Ok("id is not defined or incorrect JSON format"); 
     } 

     AgencyUsersMethods agencyusers = new AgencyUsersMethods(_configuration); 
     var result = agencyusers.GetAgencyUser(request); 

     if (result == null) 
     { 
      return Ok("User not Found"); 
     } 
     else 
     { 
      return Ok(result); 
     } 

    } 
    catch (Exception ex) 
    { 
     return BadRequest(ex.Message); 
    } 

}

ASP.NET Core 2.0 Web API从离子3接收/发送Json请求3

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