C#•10mo ago

issues loading winform with api rest

hi i got the following code:

using Json.Net;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Net.Http;
using Syncfusion.WinForms.DataGrid;

namespace SfDataGrid_REST_API
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            sfDataGrid1.DataSource = GetRESTData("http://45.237.184.122:4000/clientes?limit=10");
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "OrderID" });
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "CustomerID" });
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "EmployeeID" });
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "Freight" });
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "ShipCity" });
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "Verified" });
        }

        private JArray GetRESTData(string uri)
        {
            var webRequest = (HttpWebRequest)WebRequest.Create(uri);
            var webResponse = (HttpWebResponse)webRequest.GetResponse();
            var reader = new StreamReader(webResponse.GetResponseStream());
            string data = reader.ReadToEnd();
            return JsonConvert.DeserializeObject<JArray>(data);       
        }
    }
}

using Json.Net;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Net.Http;
using Syncfusion.WinForms.DataGrid;

namespace SfDataGrid_REST_API
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            sfDataGrid1.DataSource = GetRESTData("http://45.237.184.122:4000/clientes?limit=10");
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "OrderID" });
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "CustomerID" });
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "EmployeeID" });
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "Freight" });
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "ShipCity" });
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "Verified" });
        }

        private JArray GetRESTData(string uri)
        {
            var webRequest = (HttpWebRequest)WebRequest.Create(uri);
            var webResponse = (HttpWebResponse)webRequest.GetResponse();
            var reader = new StreamReader(webResponse.GetResponseStream());
            string data = reader.ReadToEnd();
            return JsonConvert.DeserializeObject<JArray>(data);       
        }
    }
}

but getting this: Newtonsoft.Json.JsonSerializationException: 'Deserialized JSON type 'Newtonsoft.Json.Linq.JObject' is not compatible with expected type 'Newtonsoft.Json.Linq.JArray'. Path '', line 1, position 9636.' what im missing?

8 Replies

Angius•10mo ago

reason you're rawdogging it with JObjects and JArrays instead of proper classes? Any reason you're using the deprecated WebRequest instead of HttpClient? The error just tells you that the response contains a single object, but you're trying to get an array out of it So, a quick fix would be using JObject instead of JArray But it'd be putting lipstick on a pig

agaitan026•10mo ago

any reason i should use httpclient? is faster?

Angius•10mo ago

It's not deprecated

agaitan026•10mo ago

was a sample provided 😦 just learning

Angius•10mo ago

Well it's a bad sample then, just gonna say straight away

agaitan026•10mo ago

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            sfDataGrid1.DataSource = GetRESTData("http://45.237.184.122:4000/clientes?limit=10");
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "idclave_nombre" });
        }

        private JObject GetRESTData(string uri)
        {
            var webRequest = (HttpWebRequest)WebRequest.Create(uri);
            var webResponse = (HttpWebResponse)webRequest.GetResponse();
            var reader = new StreamReader(webResponse.GetResponseStream());
            string data = reader.ReadToEnd();
            return JsonConvert.DeserializeObject<JObject>(data);

        }
    }
}

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            sfDataGrid1.DataSource = GetRESTData("http://45.237.184.122:4000/clientes?limit=10");
            this.sfDataGrid1.Columns.Add(new GridTextColumn() { MappingName = "idclave_nombre" });
        }

        private JObject GetRESTData(string uri)
        {
            var webRequest = (HttpWebRequest)WebRequest.Create(uri);
            var webResponse = (HttpWebResponse)webRequest.GetResponse();
            var reader = new StreamReader(webResponse.GetResponseStream());
            string data = reader.ReadToEnd();
            return JsonConvert.DeserializeObject<JObject>(data);

        }
    }
}

i see i should redo all with httpclient then

Angius•10mo ago

Getting data from an API should be something more akin to

private static HttpClient _client = new();

private async Task<SomeDataClass> GetData(string url)
{
    return await _client.GetFromJsonAsync<SomeDataClass>(url);
}

private static HttpClient _client = new();

private async Task<SomeDataClass> GetData(string url)
{
    return await _client.GetFromJsonAsync<SomeDataClass>(url);
}

With SomeDataClass being a class that describes your JSON Which you can even generate, if need be $jsongen

MODiX•10mo ago

Use https://app.quicktype.io or https://json2csharp.com to generate classes from your JSON

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issues loading winform with api rest