Queuing asynchronous task in C#

Question

I have few methods that report some data to Data base. We want to invoke all calls to Data service asynchronously. These calls to data service are all over and so we want to mak

Answer 1

Please keep in mind that your first solution queueing all tasks to lists doesn't ensure that the tasks are executed one after another. They're all running in parallel because they're not awaited until the next tasks is startet.

So yes you've to use a SemapohoreSlim to use async locking and await. A simple implementation might be:

private readonly SemaphoreSlim _syncRoot = new SemaphoreSlim(1);

public async Task SendModuleDataToDSAsync(Module parameters)
{
    await this._syncRoot.WaitAsync();
    try
    {
        foreach (var setting in Module.param)
        {
           await SaveModule(setting);
           await SaveModule(GetAdvancedData(setting));
        }
    }
    finally
    {
        this._syncRoot.Release();
    }
}

If you can use Nito.AsyncEx the code can be simplified to:

public async Task SendModuleDataToDSAsync(Module parameters)
{
    using var lockHandle = await this._syncRoot.LockAsync();

    foreach (var setting in Module.param)
    {
       await SaveModule(setting);
       await SaveModule(GetAdvancedData(setting));
    }
}