CODEWITHSUNDEEP
blazorstackexchange.redisblazor-client-sideblazor-webassembly
Kubus
Kubus

Reputation: 777

How to use StackExchange.Redis in a Blazor WebAssembly app?

I tried to call ConnectionMultiplexer.ConnectAsync in a Blazor client-side component in the following way: 

protected override async Task OnInitializedAsync()
{
  var configuration = new ConfigurationOptions
  {
    AbortOnConnectFail = false,
    ConnectTimeout = 3000,
    SyncTimeout = 5000,
    KeepAlive = 180,
    EndPoints =
    {
      {
        "localhost", 6379
      }
    }
  };

  await ConnectionMultiplexer.ConnectAsync(configuration);

  await base.OnInitializedAsync();
}

This throws an exception:

children could not be evaluated

How Is it possible to use StackExchange.Redis in a Blazor WebAssembly app?

Edit:

I found a more verbose error message in the VS output:

  Unhandled exception rendering component: Cannot start threads on this runtime.

System.NotSupportedException: Cannot start threads on this runtime. at (wrapper managed-to-native) System.Threading.Thread.Thread_internal(System.Threading.Thread,System.MulticastDelegate) at System.Threading.Thread.StartInternal (System.Object principal, System.Threading.StackCrawlMark& stackMark) <0x3b02590 + 0x00008> in :0 at System.Threading.Thread.Start (System.Threading.StackCrawlMark& stackMark) <0x3b02450 + 0x0004e> in :0 at System.Threading.Thread.Start (System.Object parameter) <0x3b022d0 + 0x0003a> in :0 at Pipelines.Sockets.Unofficial.DedicatedThreadPoolPipeScheduler.StartWorker (System.Int32 id) [0x0003a] in C:\Code\Pipelines.Sockets.Unofficial\src\Pipelines.Sockets.Unofficial\DedicatedThreadPoolPipeScheduler.cs:112 at Pipelines.Sockets.Unofficial.DedicatedThreadPoolPipeScheduler..ctor (System.String name, System.Int32 workerCount, System.Int32 useThreadPoolQueueLength, System.Threading.ThreadPriority priority) [0x00072] in C:\Code\Pipelines.Sockets.Unofficial\src\Pipelines.Sockets.Unofficial\DedicatedThreadPoolPipeScheduler.cs:74 at StackExchange.Redis.SocketManager..ctor (System.String name, System.Int32 workerCount, StackExchange.Redis.SocketManager+SocketManagerOptions options) [0x0006e] in //src/StackExchange.Redis/SocketManager.cs:98 at StackExchange.Redis.SocketManager..ctor (System.String name, System.Int32 workerCount, System.Boolean useHighPrioritySocketThreads) [0x00000] in //src/StackExchange.Redis/SocketManager.cs:44 at StackExchange.Redis.SocketManager.get_Shared () [0x0000c] in //src/StackExchange.Redis/SocketManager.cs:132 at StackExchange.Redis.ConnectionMultiplexer.OnCreateReaderWriter (StackExchange.Redis.ConfigurationOptions configuration) [0x00000] in //src/StackExchange.Redis/ConnectionMultiplexer.ReaderWriter.cs:9 at StackExchange.Redis.ConnectionMultiplexer..ctor (StackExchange.Redis.ConfigurationOptions configuration) [0x000d6] in //src/StackExchange.Redis/ConnectionMultiplexer.cs:1150 at StackExchange.Redis.ConnectionMultiplexer.CreateMultiplexer (System.Object configuration, StackExchange.Redis.ConnectionMultiplexer+LogProxy log, System.EventHandler`1[StackExchange.Redis.ConnectionFailedEventArgs]& connectHandler) [0x0000d] in //src/StackExchange.Redis/ConnectionMultiplexer.cs:957 at StackExchange.Redis.ConnectionMultiplexer.ConnectImplAsync (System.Object configuration, System.IO.TextWriter log) [0x0003a] in /_/src/StackExchange.Redis/ConnectionMultiplexer.cs:854 at Joker.BlazorApp.Sample.Pages.ProductsComponentBase.OnInitializedAsync () [0x0007c] in C:\Users\tomas.fabian\source\repos\Joker.BlazorApp.Sample\Joker.BlazorApp.Sample\Pages\ProductsComponentBase.cs:52 at Microsoft.AspNetCore.Components.ComponentBase.RunInitAndSetParametersAsync () <0x37da140 + 0x0013a> in :0

Upvotes: 0

Views: 1594

Answers (1)

Vencovsky
Vencovsky

Reputation: 31693

You cannot use StackExchange Redis in blazor webassembly because that is like an SDK for connecting and managing the redis, not the redis it self.

And the error message saying

Unhandled exception rendering component: Cannot start threads on this runtime.

Means that it cannot run the redis in webassembly.

If you want to use StackExchange Redis, you need to create some api that will be connected with the redis.

If you want to cache some data in the client side, you can either user localStorage/sessionStorage or IndexedDB.

Upvotes: 1

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