console.writeline输出的值怎么是-1

做了个小实验
 Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Console.WriteLine("我来阿")
        TextBox1.Text = Console.Read()

    End Sub
不知道为什么输出了阿"-1"