C#实现VB中的asc和chr函数，字符（含中文）转ASCII

        /// <summary>
        /// 传入单个字符，得到字符的ASCII码
        /// </summary>
        /// <param name="chr">汤</param>
        /// <returns>-13120</returns>
        public static int ASCII(string chr)
        {
            Encoding ecode = Encoding.GetEncoding("GB18030");
            Byte[] codeBytes = ecode.GetBytes(chr);
            if (IsTwoBytesChar(chr))
            {
                // 双字节码为高位乘256，再加低位
                // 该为无符号码，再减65536
                return (int)codeBytes[0] * 256 + (int)codeBytes[1] - 65536;
            }
            else
            {
                return (int)codeBytes[0];
            }
        }
        /// <summary>
        /// 传入单个字符的ASCII码，得到ASCII码对应的字符（含双字节）
        /// </summary>
        /// <param name="asc">-13120</param>
        /// <returns>汤</returns>
        public static string Character(int asc)
        {
            //asc = asc + 65536;
            Encoding asciiEncoding = Encoding.GetEncoding("GB18030");
            Byte[] chrByte = BitConverter.GetBytes((short)asc);
            string strCharacter = string.Empty;
            if (asc < 0 || asc > 255)
            {
                Byte[] chrByteStr = new byte[2];
                chrByteStr[0] = chrByte[1];
                chrByteStr[1] = chrByte[0];
                strCharacter = asciiEncoding.GetString(chrByteStr);
            }
            else
            {
                Byte[] chrByteStr = new byte[1];
                chrByteStr[0] = chrByte[0];
                strCharacter = asciiEncoding.GetString(chrByteStr);
            }
            return (strCharacter);
        }

　　下面对应单元测试

        [TestMethod]
        public void CharacterTest()
        {
            Assert.AreEqual(CommonFuntion.Character(-13120), "汤");
            Assert.AreEqual(CommonFuntion.Character(-10544), "中");
        }
        [TestMethod]
        public void ASCIITest()
        {
            Assert.AreEqual(CommonFuntion.ASCII("中"), -10544);
            Assert.AreEqual(CommonFuntion.ASCII("汤"), -13120);
        }
        [TestMethod]
        public void ASCIIAndCharTest()
        {
            Assert.AreEqual("中", CommonFuntion.Character(CommonFuntion.ASCII("中")));
            Assert.AreEqual("汤", CommonFuntion.Character(CommonFuntion.ASCII("汤")));
            Assert.AreEqual("A", CommonFuntion.Character(CommonFuntion.ASCII("A")));
            Assert.AreEqual("￥", CommonFuntion.Character(CommonFuntion.ASCII("￥")));
            Assert.AreEqual(-13120, CommonFuntion.ASCII(CommonFuntion.Character(-13120)));
            Assert.AreEqual(-10544, CommonFuntion.ASCII(CommonFuntion.Character(-10544)));
        }