如何为Task<EventCallback>类型字段赋值

Task<EventCallback> task = Task.Run(() =>
{
    // 执行异步操作，生成EventCallback类型结果
    EventCallback result = SomeAsyncMethod();
    return result;
});

TaskCompletionSource<EventCallback> tcs = new TaskCompletionSource<EventCallback>();
// 执行异步操作，生成EventCallback类型结果
EventCallback result = SomeAsyncMethod();
tcs.SetResult(result);
Task<EventCallback> task = tcs.Task;

async Task<EventCallback> GetEventCallbackAsync()
{
    // 执行异步操作，生成EventCallback类型结果
    EventCallback result = await SomeAsyncMethod();
    return result;
}

Task<EventCallback> task = GetEventCallbackAsync();