AsyncCompletedEventArgs.cs

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using System.Reflection;
 
namespace System.ComponentModel;
 
public class AsyncCompletedEventArgs : EventArgs
{
    public bool Cancelled { get; }
 
    public Exception? Error { get; }
 
    public object? UserState { get; }
 
    public AsyncCompletedEventArgs(Exception? error, bool cancelled, object? userState)
    {
        Cancelled = cancelled;
        Error = error;
        UserState = userState;
    }
 
    protected void RaiseExceptionIfNecessary()
    {
        if (Error != null)
        {
            throw new TargetInvocationException(System.SR.Async_ExceptionOccurred, Error);
        }
        if (Cancelled)
        {
            throw new InvalidOperationException(System.SR.Async_OperationCancelled);
        }
    }
}