文本框输入自动切换输入法问题

方法一：

private void textBox1_Enter(object sender, EventArgs e)
  {
  InputLanguage il = InputLanguage.InstalledInputLanguages[0];
  InputLanguage.CurrentInputLanguage = il;
  }
  private void textBox1_Leave(object sender, EventArgs e)
  {
  InputLanguage il = InputLanguage.InstalledInputLanguages[1];
  InputLanguage.CurrentInputLanguage = il;
  }

 方法二：

//获取计算机已安装输入法
string mm = "";
            foreach (InputLanguage l in InputLanguage.InstalledInputLanguages)
            {
                mm += "/" + l.LayoutName;
                          }
            textBox2.Text = mm;

 foreach (InputLanguage l in InputLanguage.InstalledInputLanguages)
            {
                  if (l.LayoutName.IndexOf("五笔") > -1)                InputLanguage.CurrentInputLanguage = l; 
            }