如何区分半角和全角字符

如果要判断一个字符串里的全角字符数 ,只需用字符串的字节数减去字符串的字数即可:

 

            int wordsCount,bytesCount;
            string str = this.textBox1.Text;
            wordsCount = str.Length;
            bytesCount = Encoding.Default.GetByteCount(str);
            this.textBox2.Text = bytesCount.ToString();
            this.textBox3.Text = wordsCount.ToString();