How to consume web api from windows form

hi guys,, l'm learn how to consume wep api from windows form, when I try consume wep api using webform run properly and can cunsume all method, but when I'm consume wep api from windows form I'm getting error with the message Configuration system failed to initialize, I'm just try to get all data from Web APIs using windows form.

Any help could be appreciated.

this the code behind

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Web.Script.Serialization;
using System.Net.Http;
using System.Net.Http.Formatting;
using System.Net;
namespace WinFormConsumeRestfulApi
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
using (HttpClient _Client = new HttpClient())
{
_Client.BaseAddress = new Uri("http://localhost:1028/RestfullApis/");
HttpResponseMessage respon = _Client.GetAsync("api/peminjamanBuku").Result;
var pinjamBuku = respon.Content.ReadAsAsync>().Result;
dataGridView1.DataSource = pinjamBuku;
}
}
}
}

this the web api Controller

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
namespace Restfull_Apis.Controllers
{
public class PeminjamanBukuController : ApiController
{
[HttpPost]
public IEnumerable Get()
{
using (perpustakaanEntities entity = new perpustakaanEntities())
{
return entity.tbl_peminjaman.ToList();
}
}
public tbl_peminjaman Get(int id)
{
using (perpustakaanEntities entity = new perpustakaanEntities())
{
return entity.tbl_peminjaman.FirstOrDefault(p => p.id_peminjaman == id);
}
}
public void Post([FromBody] tbl_peminjaman _PinjamBuku)
{
using (perpustakaanEntities entity = new perpustakaanEntities())
{
entity.tbl_peminjaman.Add(_PinjamBuku);
entity.SaveChanges();
}
}
public void Put(int id, [FromBody] tbl_peminjaman Pinjam)
{
using (perpustakaanEntities entity = new perpustakaanEntities())
{
var _entity = entity.tbl_peminjaman.FirstOrDefault(p => p.id_peminjaman == id);
_entity.tanggal_pinjam = Pinjam.tanggal_pinjam;
_entity.tanggal_kembali = Pinjam.tanggal_kembali;
_entity.id_buku = Pinjam.id_buku;
_entity.id_anggota = Pinjam.id_anggota;
_entity.id_petugas = Pinjam.id_petugas;
entity.SaveChanges();
}
}
public void Delete(int id)
{
using (perpustakaanEntities entity = new perpustakaanEntities())
{
entity.tbl_peminjaman.Remove(entity.tbl_peminjaman.FirstOrDefault(p => p.id_peminjaman == id));
entity.SaveChanges();
}
}
}
}

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Salman Beg5y ago
Accepted answer
Hey i think you didn't added required nuget package in window forms application. Check this link, https://stackoverflow.com/questions/32716174/call-and-consume-web-api-in-winform-using-c-net/32716351
+1
Tri Setia5y ago
ok thanks for the answer,,
l will try it.
0
Suraj Dubey5y ago
Hi,

try this it will you

https://docs.microsoft.com/en-us/aspnet/web-api/overview/advanced/calling-a-web-api-from-a-net-client?WT.mc_id=DT-MVP-5003235

https://www.c-sharpcorner.com/article/consume-web-api-in-winform-for-file-handling/
+1