C# 半角？全角

/// <summary>

    /// 将资料表中已修改的资料行数据去左右空格、全角转半角

    /// </summary>

    public sealed class FieldFitString

    {

        const string _SEPERATOR = "&^*";



        /// <summary>

        /// 将资料表中已修改的资料行数据去左右空格、全角转半角

        /// </summary>

        /// <param name="dt"></param>

        public static void FitString(DataTable dt)

        {

            DataTable tmp = dt.GetChanges();

            if (tmp == null) return;



            //枚举Columns,仅处理字符类型的Field

            //枚举DataRow,仅处理新增、修改状态的记录

            string tmpFileNames = string.Empty;



            //取出字段

            for (int i = 0; i < dt.Columns.Count; i++)

            {

                if (dt.Columns[i].DataType == Type.GetType("System.String"))

                {

                    tmpFileNames += _SEPERATOR + dt.Columns[i].Caption;

                }

            }



            string[] FileNames = tmpFileNames.Split(new string[] { _SEPERATOR }, StringSplitOptions.RemoveEmptyEntries);



            //仅处理已修改的资料行

            foreach (DataRow dr in dt.Rows)

            {

                if (dr.RowState == DataRowState.Added || dr.RowState == DataRowState.Modified)

                {

                    foreach (string filename in FileNames)

                    {

                        dr[filename] = RemoveChar(ConvertEx.ToString(dr[filename]));

                    }

                }

            }

        }





        /// <summary>

        /// 将资料表中已修改的资料行数据去左右空格、全角转半角

        /// </summary>

        /// <param name="str"></param>

        /// <returns></returns>

        public static string RemoveChar(string str)

        {

            if (String.IsNullOrEmpty(str)) return str;



            try

            {

                string NewStr = string.Empty;

                char[] c = str.ToCharArray();

                for (int i = 0; i < c.Length; i++)

                {

                    byte[] b = System.Text.Encoding.Unicode.GetBytes(c, i, 1);





                    if (b.Length == 2)

                    {

                        //全角

                        if (b[1] == 255 || b[1] == 48)

                        {

                            b[0] = (byte)(b[0] + 32);

                            b[1] = 0;

                            NewStr += System.Text.Encoding.Unicode.GetChars(b)[0];

                        }

                        else

                        {

                            NewStr += c[i];

                        }

                    }

                }



                return NewStr.Trim();//去左右空格



            }

            catch

            {

                return str;

            }

        }



    }