“严重性代码描述项目文件行抑制状态错误CS1983返回类型”

Question

“严重性代码描述项目文件行抑制状态 错误CS1983异步方法的返回类型必须为void，任务，任务，类似任务的类型，IAsyncEnumerable或IAsyncEnumerator CapstoneUVTapEx C：\ Users \ Thor \ source \ repos \ CapstoneUVTapEx \ CapstoneUVTapEx \ MainForms \ Main.cs 103有效 “

 public async bool CheckIfIDexist(int x)
        {
            try
            {
                FirebaseResponse firebaseResponse = await client.GetTaskAsync("user/" + x);
                Data data = firebaseResponse.ResultAs<Data>();
                int y = int.Parse(data.id);
                if (x == y)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }