AsyncOperationManager.cs

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using System.Threading;
 
namespace System.ComponentModel;
 
public static class AsyncOperationManager
{
    [EditorBrowsable(EditorBrowsableState.Advanced)]
    public static SynchronizationContext SynchronizationContext
    {
        get
        {
            if (System.Threading.SynchronizationContext.Current == null)
            {
                System.Threading.SynchronizationContext.SetSynchronizationContext(new SynchronizationContext());
            }
            return System.Threading.SynchronizationContext.Current;
        }
        set
        {
            System.Threading.SynchronizationContext.SetSynchronizationContext(value);
        }
    }
 
    public static AsyncOperation CreateOperation(object? userSuppliedState)
    {
        return AsyncOperation.CreateOperation(userSuppliedState, SynchronizationContext);
    }
}