Wpf TextChanged事件导致死循环，事件触发循环问题

//比特
private void txtb_TextChanged(object sender, TextChangedEventArgs e)
{
    if (ChangeTxtB) //如果当前是正在修改txtB，后面的代码不执行
        return;
    try
    {
        if (string.IsNullOrEmpty(txtb.Text))
        {
            txtb.Focus();
            return;
        }

        double number = double.Parse(txtb.Text);
        txtB.Text = (number / 8.0).ToString();
    }
    catch (Exception ex)
    {
        ShowError(ex.Message);
    }
}
//标识txtB对话框正在修改数据
private bool ChangeTxtB = false;
//字节
private void txtB_TextChanged_1(object sender, TextChangedEventArgs e)
{
label1.Content = "";
try
{
if (string.IsNullOrEmpty(txtB.Text))
{
    txtB.Focus();
    return;
}
//标识正在修改txtB
ChangeTxtB = true;
//吉字节变换是统一修改其他内容
double number = double.Parse(txtB.Text);
txtb.Text = (number * 8).ToString();//当修改Text属性时，txtb_TextChanged会立即同步触发
txtKB.Text = (number / 1024.0).ToString();
txtMB.Text = (number / 1024.0 / 1024.0).ToString();
txtGB.Text = (number / 1024.0 / 1024.0 / 1024.0).ToString();
txtTB.Text = (number / 1024.0 / 1024.0 / 1024.0 / 1024.0).ToString();
}
catch (Exception ex)
{
ShowError(ex.Message);
}
//标识结束修改txtB
ChangeTxtB = false;
}