转全角半角(C#，VB.NET)

       /// 转全角的函数(SBC case) /// 
      /// 任意字符串 /// 全角字符串 ///
       ///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 ///

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);
}

///

/// 转半角的函数(DBC case) ///

/// 任意字符串
/// 半角字符串 ///
///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 ///
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

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