转全角半角(C#，VB.NET)

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        /**//// <summary>
        /// 转全角的函数(SBC case)
        /// </summary>
        /// <param name="input">任意字符串</param>
        /// <returns>全角字符串</returns>
        ///<remarks>
        ///全角空格为12288，半角空格为32
        ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
        ///</remarks>
        public string ToSBC(string input)
        {
            //半角转全角：
            char[] c=input.ToCharArray();
            for (int i = 0; i < c.Length; i++)
            {
                if (c[i]==32)
                {
                    c[i]=(char)12288;
                    continue;
                }
                if (c[i]<127)
                    c[i]=(char)(c[i]+65248);
            }
            return new string(c);
        }

        /**//// <summary>
        /// 转半角的函数(DBC case)
        /// </summary>
        /// <param name="input">任意字符串</param>
        /// <returns>半角字符串</returns>
        ///<remarks>
        ///全角空格为12288，半角空格为32
        ///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
        ///</remarks>
        public string ToDBC(string input)
        {
            char[] c=input.ToCharArray();
            for (int i = 0; i < c.Length; i++)
            {
                if (c[i]==12288)
                {
                    c[i]= (char)32;
                    continue;
                }
                if (c[i]>65280 && c[i]<65375)
                    c[i]=(char)(c[i]-65248);
            }
            return new string(c);
        }

VB版本：

    Public Function ToSBC()Function ToSBC(ByVal input As String) As String '转全角
        Dim c As Char() = input.ToCharArray
        Dim i As Integer = 0
        While i < c.Length
            If c(i) = ChrW(32) Then
                c(i) = ChrW(12288)
            ElseIf AscW(c(i)) < 127 Then
                c(i) = ChrW((AscW(c(i)) + 65248))
            End If
            System.Math.Min(System.Threading.Interlocked.Increment(i), i - 1)
        End While
        Return New String(c)
    End Function

Public Function ToDBC()Function ToDBC(ByVal input As String) As String '转半角

        Dim c As Char() = input.ToCharArray
        Dim i As Integer = 0
        While i < c.Length
            If AscW(c(i)) = 12288 Then
                c(i) = ChrW(32)
            ElseIf AscW(c(i)) > 65280 AndAlso AscW(c(i)) < 65375 Then
                c(i) = ChrW(AscW(c(i)) - 65248)
            End If
            System.Math.Min(System.Threading.Interlocked.Increment(i), i - 1)
        End While
        Return New String(c)
    End Function