https://gitee.com/kuiyu/dotnetcodes/tree/master/DotNet.Utilities/%E6%B1%89%E5%AD%97%E8%BD%AC%E6%8B%BC%E9%9F%B3

 textBox2.Text = PinYin.GetCodstring(textBox1.Text);

EcanConvertToCh toCh = new EcanConvertToCh();
textBox3.Text = toCh.convertCh(textBox1.Text);