求全角转半角的函数，大虾们帮帮忙！ 虾米谢了！

Question

比如全角４怎么转换为半角4呢？谢谢！

Answer 1

        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);
        }        private void button1_Click(object sender, EventArgs e)
        {            MessageBox.Show(ToDBC("５"));
        }

Answer 2

  
  //半角到全角   
  Microsoft.VisualBasic.Strings.StrConv("abc",Microsoft.VisualBasic.VbStrConv.Wide,0);   
  //全角到半角   
  Microsoft.VisualBasic.Strings.StrConv("ａｂｃ",Microsoft.VisualBasic.VbStrConv.Narrow,0);