我需要一段代码,根据参数键,它只允许一个线程同时执行:
private static readonly ConcurrentDictionary<string, SemaphoreSlim> Semaphores = new();
private async Task<TModel> GetValueWithBlockAsync<TModel>(string valueKey, Func<Task<TModel>> valueAction)
{
var semaphore = Semaphores.GetOrAdd(valueKey, s => new SemaphoreSlim(1, 1));
try
{
await semaphore.WaitAsync();
return await valueAction();
}
finally
{
semaphore.Release(); // Exception here - System.ObjectDisposedException
if (semaphore.CurrentCount > 0 && Semaphores.TryRemove(valueKey, out semaphore))
{
semaphore?.Dispose();
}
}
}
我时常会遇到这样的错误:
The semaphore has been disposed. : System.ObjectDisposedException: The semaphore has been disposed.
at System.Threading.SemaphoreSlim.CheckDispose()
at System.Threading.SemaphoreSlim.Release(Int32 releaseCount)
at Project.GetValueWithBlockAsync[TModel](String valueKey, Func`1 valueAction)
我能想象的所有情况都是线程安全.请帮忙,我错过了什么案子?