EnvelopeGenerator/EnvelopeGenerator.WebUI/EnvelopeGenerator.WebUI.Client/Services/CustomDataSourceWizardJsonDataConnectionStorage.cs

using DevExpress.DataAccess.Json;
using DevExpress.DataAccess.Web;
using DevExpress.DataAccess.Wizard.Services;

namespace EnvelopeGenerator.WebUI.Client.Services
{
    public class CustomDataSourceWizardJsonDataConnectionStorage : IDataSourceWizardJsonConnectionStorage
    {
        public static JsonDataConnection GetDefaultConnection() {
            var uriJsonSource = new UriJsonSource() {
                Uri = new Uri(@"https://raw.githubusercontent.com/DevExpress-Examples/DataSources/master/JSON/customers.json"),
            };
            return new JsonDataConnection(uriJsonSource) { StoreConnectionNameOnly = true, Name = "NWindProductsJson" };
        }
        public static List<JsonDataConnection> GetConnections() {
            var connections = new List<JsonDataConnection> {
                GetDefaultConnection()
            };
            return connections;
        }

        bool IJsonConnectionStorageService.CanSaveConnection => false;
        bool IJsonConnectionStorageService.ContainsConnection(string connectionName) {
            return GetConnections().Any(x => x.Name == connectionName);
        }

        IEnumerable<JsonDataConnection> IJsonConnectionStorageService.GetConnections() {
            return GetConnections();
        }

        JsonDataConnection IJsonDataConnectionProviderService.GetJsonDataConnection(string name) {
            var connection = GetConnections().FirstOrDefault(x => x.Name == name);
            if(connection == null)
                throw new InvalidOperationException();
            return connection;
        }

        void IJsonConnectionStorageService.SaveConnection(string connectionName, JsonDataConnection connection, bool saveCredentials) { }
    }
}