For anyone having the same problem: You are probably using the following code

(which up to some point in time was provided at https://docs.telerik.com/blazor-ui/components/grid/state?_ga=2.133702286.1442066412.1587385045-1627434252.1580897464#information-in-the-grid-state

using Microsoft.JSInterop;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Threading.Tasks;
using Telerik.DataSource;

namespace Your.Namespace
{
     public class LocalStorageService : ILocalStorageService
    {
        protected IJSRuntime JsRuntimeInstance { get; set; }

        public LocalStorageService(IJSRuntime jsRuntime)
        {
            JsRuntimeInstance = jsRuntime;
        }

        public ValueTask SetItem(string key, object data)
        {
            return JsRuntimeInstance.InvokeVoidAsync("localStorage.setItem", new object[]
            {
                key,
                JsonConvert.SerializeObject(data)
            });
        }

        public async Task<T> GetItem<T>(string key)
        {
            var data = await JsRuntimeInstance.InvokeAsync<string>("localStorage.getItem", key);
            if (!string.IsNullOrEmpty(data))
            {
                return JsonConvert.DeserializeObject<T>(data, new JsonSerializerSettings()
                {
                    Converters = new JsonConverter[]
                    {
                        new FilterDescriptorJsonConverter()
                    },
                    NullValueHandling = NullValueHandling.Ignore
                });
            }

            return default;
        }

        public ValueTask RemoveItem(string key)
        {
            return JsRuntimeInstance.InvokeVoidAsync("localStorage.removeItem", key);
        }
    }

// to store the serialized grid state, we need to have a custom serialized
// based on Newtonsoft.Json serialization. In the future this may not be required
    public class FilterDescriptorJsonConverter : JsonConverter
    {
        public override bool CanConvert(Type objectType)
        {
            return objectType == typeof(FilterDescriptorBase);
        }

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue,
            JsonSerializer serializer)
        {
            JObject filterDescriptor = JObject.Load(reader);

            return filterDescriptor.ToObject<FilterDescriptor>(serializer);
        }

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
        }
    }
}

If you replace this code with the following, it will work again.

using Microsoft.JSInterop;
using System.Threading.Tasks;
using System.Text.Json;

namespace Your.Namespace
{
    public class LocalStorageService : ILocalStorageService
    {
        protected IJSRuntime JsRuntimeInstance { get; set; }

        public LocalStorageService(IJSRuntime jsRuntime)
        {
            JsRuntimeInstance = jsRuntime;
        }

        public ValueTask SetItem(string key, object data)
        {
            return JsRuntimeInstance.InvokeVoidAsync("localStorage.setItem", new object[]
            {
                key,
                JsonSerializer.Serialize(data)
            });
        }

        public async Task<T> GetItem<T>(string key)
        {
            var data = await JsRuntimeInstance.InvokeAsync<string>("localStorage.getItem", key);
            if (!string.IsNullOrEmpty(data))
            {
                return JsonSerializer.Deserialize<T>(data);
            }

            return default;
        }

        public ValueTask RemoveItem(string key)
        {
            return JsRuntimeInstance.InvokeVoidAsync("localStorage.removeItem", key);
        }
    }
}

Regards,

René

Hello Marin,

I found the reason causing the problem.

My LocalStorageService (based on example code from Telerik) was using Newtonsoft.Json + Newtonsoft.Json.Linq + a FilterDescriptorJsonConverter based on JsonConverter.

Your provided code sample uses System.Text.Json instead and does not need the FilterDescriptorJsonConverter class anymore.

With those changes my project works as expected again.

With which release did the handling of the LocalStorage change?

Regards,

René

Hello Marin,

upon watching your video, one obvious difference between your sample and our usecase is that all our tables where we use GridState have a column for expanding/closing the details for the entries.  Maybe the problem is connected to that?

I will try to reproduce the problem with your sample project, when I find the time.

Regards,

René