[Solved] ASP.Net Error: Unable to cast object of type JArray to type JObject

Hi merictokatlio...,

Check the modified code.

HTML

<asp:GridView runat="server" ID="gvIlkokul"></asp:GridView>

Namespaces

C#

using System.Net;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

VB.Net

Imports System.Net
Imports Newtonsoft.Json
Imports Newtonsoft.Json.Linq

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    string stRead =
        (new WebClient()).DownloadString("https://onyuzyonetim.eba.gov.tr/api/show/plans/daily?date=2020-10-19&classType=ilkokul");
    var jArray = JsonConvert.DeserializeObject<JArray>(stRead).Root.ToList();
    List<Eba_Ilkokul> ilkokuls = new List<Eba_Ilkokul>();
    foreach (JObject jObject in jArray)
    {
        Eba_Ilkokul ilkokul = new Eba_Ilkokul();
        ilkokul.classLevel = ((JValue)jObject["classLevel"]).Value.ToString();
        ilkokul.title = ((JValue)jObject["title"]).Value.ToString();
        ilkokul.hour = ((JValue)jObject["hour"]).Value.ToString();
        ilkokul.day = Convert.ToDateTime(((JValue)jObject["day"]).Value).ToString("dd/MM/yyyy");
        ilkokul.trtLink = ((JValue)jObject["trtLink"]).Value.ToString();
        ilkokul.ebaLink = ((JValue)jObject["ebaDownloadLink"]).Value.ToString();
        ilkokul.ebaDownloadLink = ((JValue)jObject["title"]).Value.ToString();
        ilkokul.subject = ((JValue)jObject["subject"]).Value.ToString();
        ilkokuls.Add(ilkokul);
    }

    gvIlkokul.DataSource = ilkokuls;
    gvIlkokul.DataBind();
}

public class Eba_Ilkokul
{
    public string title { get; set; }
    public string hour { get; set; }
    public string day { get; set; }
    public string classLevel { get; set; }
    public string trtLink { get; set; }
    public string ebaLink { get; set; }
    public string ebaDownloadLink { get; set; }
    public string subject { get; set; }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim stRead As String =
        (New WebClient()).DownloadString("https://onyuzyonetim.eba.gov.tr/api/show/plans/daily?date=2020-10-19&classType=ilkokul")
    Dim jArray = JsonConvert.DeserializeObject(Of JArray)(stRead).Root.ToList()
    Dim ilkokuls As List(Of Eba_Ilkokul) = New List(Of Eba_Ilkokul)()

    For Each jObject As JObject In jArray
        Dim ilkokul As Eba_Ilkokul = New Eba_Ilkokul()
        ilkokul.classLevel = (CType(jObject("classLevel"), JValue)).Value.ToString()
        ilkokul.title = (CType(jObject("title"), JValue)).Value.ToString()
        ilkokul.hour = (CType(jObject("hour"), JValue)).Value.ToString()
        ilkokul.day = Convert.ToDateTime(CType(jObject("day"), JValue).Value).ToString("dd/MM/yyyy")
        ilkokul.trtLink = (CType(jObject("trtLink"), JValue)).Value.ToString()
        ilkokul.ebaLink = (CType(jObject("ebaDownloadLink"), JValue)).Value.ToString()
        ilkokul.ebaDownloadLink = (CType(jObject("title"), JValue)).Value.ToString()
        ilkokul.subject = (CType(jObject("subject"), JValue)).Value.ToString()
        ilkokuls.Add(ilkokul)
    Next

    gvIlkokul.DataSource = ilkokuls
    gvIlkokul.DataBind()
End Sub

Public Class Eba_Ilkokul
    Public Property title As String
    Public Property hour As String
    Public Property day As String
    Public Property classLevel As String
    Public Property trtLink As String
    Public Property ebaLink As String
    Public Property ebaDownloadLink As String
    Public Property subject As String
End Class