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CS4010 How to convert async lambda expression to delegate type 'TaskAction'


CS4010 How to convert async lambda expression to delegate type 'TaskAction'

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CS4010 How to convert async lambda expression to delegate type 'TaskAction'
Tag : chash , By : Martin
Date : November 29 2020, 12:01 PM

fixed the issue. Will look into that further The TaskAction may not be an async expression. It has to be synchronous. CANoe's framework will make sure that it is executed in a background task.
Best would be to call whatever synchronous method GetLastKnownUpdateStatus is finally calling to directly like this
public async void GetLastKnownUpdateStatus(string UUIDStr, short ClientId)
{
    UpdateStatusInfo x = new UpdateStatusInfo();
    if (Execution.WaitForTask((canceltoken) => {
          x = GetLastKnownUpdateStatusSync(UUIDStr, ClientId); return true;
        }
    ) > Execution.WAIT_TIMEOUT)
    {
        Output.WriteLine("GetLastKnownUpdateStatus: "+ x.State.ToString());
    }
}
public async void GetLastKnownUpdateStatus(string UUIDStr, short ClientId)
{
    UpdateStatusInfo x = new UpdateStatusInfo();
    if (Execution.WaitForTask((canceltoken) => { 
          x = GetLastKnownUpdateStatus(UUIDStr, ClientId).ConfigureAwait(false).GetAwaiter().GetResult(); return true;
        }
    ) > Execution.WAIT_TIMEOUT)
    {
        Output.WriteLine("GetLastKnownUpdateStatus: "+ x.State.ToString());
    }
}

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Convert async lambda expression to delegate type System.Func<T>?


Tag : chash , By : Mahyar Sepehr
Date : March 29 2020, 07:55 AM
I hope this helps you . No can do. When someone expects a Func f you can assume it will be invoked with something like result = f() - i.e., it does not know about async behavior. If you cheat it by using .Result like you have - it will deadlock on UI thread because it wants to schedule the code after await (in _Fetch) on the UI thread, but you have already blocked it with .Result.
Async lambda can be passed to Action since it has no return value - or to Func or Func>.

Cannot convert async lambda expression to delegate type 'Func<bool, string, bool>'


Tag : chash , By : Dov
Date : March 29 2020, 07:55 AM
seems to work fine I would personally use the foreach implementation, but answering the concrete question.
Without async the Aggregate overload used has the following signature:
bool Aggregate<bool, string>(bool seed, Func<bool, string, bool> func)
Task<bool> Aggregate<bool, string>(Task<bool> seed, Func<Task<bool>, string, Task<bool>> func)
return await _serverPortsConfig.CacheServerPorts
    .Select(cacheServerPort => $"http://{url.Host}:{cacheServerPort}{url.AbsolutePath}")
    .Aggregate(Task.FromResult(true), async (current, memoryCacheUrl) => 
        await current && await FlushUrlAsync(recursive, memoryCacheUrl));

Converting VB.NET code to C#: Cannot convert lambda expression to type 'Delegate' because it is not a delegate type


Tag : chash , By : Kbotei
Date : March 29 2020, 07:55 AM
it should still fix some issue Okay, so I've got I got a VB project that I'm converting to C#. So far, so good. The problem is delegates/actions are quite different between the two languages and I'm struggling to work out the difference. , Your register method should be defined as:
private void Register(int id, Action<string> method)
{
    methods.Add(id, method);
}
private void Setup()
{
    Register(5, new Action<string>((string a) => LogName(a)));
}

Cannot convert async lambda expression to delegate


Tag : chash , By : Nicholas Hunter
Date : March 29 2020, 07:55 AM
will be helpful for those in need UpsertData Class: Change HttpOperationResponse to HttpOperationResponse
protected async Task<HttpOperationResponse<Botdata>> UpsertData(string channelId, string userId, string conversationId, BotStoreType storeType, BotData data)
{
    var _result = new HttpOperationResponse<Botdata>();
    _result.Request = new HttpRequestMessage();
    try
    {
        var address = AddressFrom(channelId, userId, conversationId);
        await memoryDataStore.SaveAsync(address, storeType, data, CancellationToken.None);
    }
    catch (HttpException e)
    {
        _result.Body = data;
        _result.Response = new HttpResponseMessage { StatusCode = HttpStatusCode.PreconditionFailed };
        return _result;
    }
    catch (Exception)
    {
        _result.Response = new HttpResponseMessage { StatusCode = HttpStatusCode.InternalServerError };
        return _result;
    }
    _result.Body = data;
    _result.Response = new HttpResponseMessage { StatusCode = HttpStatusCode.OK };
    return _result;
}
    botsClient.Setup(d => d.BotState.SetConversationDataWithHttpMessagesAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<BotData>(), It.IsAny<Dictionary<string, List<string>>>(), It.IsAny<CancellationToken>()))
        .Returns((string channelId, string conversationId, BotData data, Dictionary<string, List<string>> headers, CancellationToken token) =>
        {
            return  mockConnectorFactory.UpsertData(channelId, null, conversationId, BotStoreType.BotConversationData, data);
        });

c#-WPF: Cannot convert async lambda expression to delegate type 'Func<int>'


Tag : chash , By : wrb302
Date : March 29 2020, 07:55 AM
hop of those help? Your whole method is suboptimal. You could rewrite your code to be much simpler. A few comments on your existing code first, however.
You're using Task.Factory.StartNew(), which is dangerous. In most cases you should simply use Task.Run() You're using Task.Wait() and Task.Result, which is also suboptimal, not to mention, that Task.Result includes Task.Wait() when accessing it. But I guess, that you want to test the lambda, so it's ok here.
private int Server_Get_Int(){
    var task = Task.Run(async () => {
        var c = Server_Connect();
        return (await c.GetAsync("todos/set")).ResultAs<int>();
    });

    int result = task.Result;
    Console.WriteLine(result);
    return result;
}
private async Task<int> Server_Get_Int_Async(){
    return await Task.Run(async () => {
        var c = Server_Connect();
        return (await c.GetAsync("todos/set")).ResultAs<int>();
    });
}
public async Task Foo()
{
    // This is the fetch task that's going to be completed sometime in the future. You should almost in any case use configure await on your tasks. For reasons see below.
    Task<int> intTask = Server_Get_Int_Async().ConfigureAwait(false);

    // Do something other with the task object

    // Finally await it and print
    int result = await intTask;
    Console.WriteLine(result);
}


// Do this if you just need the result and nothing else.
public async Task Bar() 
{
    int result = await Server_Get_Int_Async().ConfigureAwait(false);

   Console.WriteLine(result);
}
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