全形(SBC case)半形(DBC case)轉換類

/* —— 使用VB系統函數 —— */

using System;
using System.Collections.Generic;
using System.Text;

using Microsoft.VisualBasic;

namespace CaseConvert
{
   /// <summary>
    /// 全形(SBC case)半形(DBC case)轉換類（使用VB系統函數）
    /// 缺陷——無法識別、。兩者都將識別為? /無法轉換為＼ 等
    /// </summary>
    class CaseVBConvert
    {

        /// <summary>
        /// 全形轉換為半形
        /// </summary>
        /// <param name="sbcCaseStr">全形字元串</param>
        /// <returns>半形字元串</returns>
        public static string Convert_SBC_2_DBC(string sbcCaseStr)
        {
            return Strings.StrConv(sbcCaseStr,VbStrConv.Narrow,0);
        }

        /// <summary>
        /// 半形轉換為全形
        /// </summary>
        /// <param name="dbcCaseStr">半形字元串</param>
        /// <returns>全形字元串</returns>
        public static string Convert_DBC_2_SBC(string dbcCaseStr)
        {
            return Strings.StrConv(dbcCaseStr, VbStrConv.Wide, 0);
        }
    }
}

/* —— 使用C# —— */

using System;
using System.Collections.Generic;
using System.Text;

namespace CaseConvert
{

    /// <summary>
    /// 全形(SBC case)半形(DBC case)轉換類（C#）
    /// 全形空格為12288，半形空格為32
    /// 其他字元半形(33-126)與全形(65281-65374)的對應關係是：均相差65248
    /// </summary>
    class CaseCSConvert
    {

        /// <summary>
        /// 全形轉換為半形
        /// </summary>
        /// <param name="sbcCaseStr">全形字元串</param>
        /// <returns>半形字元串</returns>
        public static string Convert_SBC_2_DBC(string sbcCaseStr)
        {
            string strReturn = "";

            char[] sbcChr = sbcCaseStr.ToCharArray();
            for (int i = 0; i < sbcChr.Length; i++)
            {
                if (sbcChr[i] == 12288)
                {
                    sbcChr[i] = (char)32;
                    continue;
                }
                if (sbcChr[i] > 65280 && sbcChr[i] < 65375)
                    sbcChr[i] = (char)(sbcChr[i] - 65248);
            }
            strReturn = new string(sbcChr);

            return strReturn;
        }

        /// <summary>
        /// 半形轉換為全形
        /// </summary>
        /// <param name="dbcCaseStr">半形字元串</param>
        /// <returns>全形字元串</returns>
        public static string Convert_DBC_2_SBC(string dbcCaseStr)
        {
            string strReturn = "";

            char[] dbcChr = dbcCaseStr.ToCharArray();
            for (int i = 0; i < dbcChr.Length; i++)
            {
                if (dbcChr[i] == 32)
                {
                    dbcChr[i] = (char)12288;
                    continue;
                }
                if (dbcChr[i] < 127)
                    dbcChr[i] = (char)(dbcChr[i] + 65248);
            }
            strReturn = new string(dbcChr);

            return strReturn;
        }
    }
}

以上是收集整理的兩種常用全/半形字元轉換函式

個人感覺還是後一種比較合適，至少不會產生誤轉換