C# unicode GBK UTF-8和汉字互转

界面：

源码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace SomeConvert
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{

}

private void button1_Click(object sender, EventArgs e)
{
//汉字转为Unicode编码：
string hz = textBox1.Text.ToString();
byte[] b = Encoding.Unicode.GetBytes(hz);
string o = "";
foreach (var x in b)
{
o += string.Format("{0:X2}", x) + " ";
}
textBox2.Text = o;
}

private void button2_Click(object sender, EventArgs e)
{
//Unicode编码转为汉字：
string cd = textBox3.Text.ToString();
string cd2 = cd.Replace(" ", "");
cd2 = cd2.Replace("\r", "");
cd2 = cd2.Replace("\n", "");
cd2 = cd2.Replace("\r\n", "");
cd2 = cd2.Replace("\t", "");
if (cd2.Length % 4 != 0)
{
MessageBox.Show("Unicode编码为双字节，请删多或补少！确保是二的倍数。");
}
else
{
int len = cd2.Length / 2;
byte[] b = new byte[len];
for (int i = 0; i < cd2.Length; i += 2)
{
string bi = cd2.Substring(i, 2);
b[i / 2] = (byte)Convert.ToInt32(bi, 16);
}
string o = Encoding.Unicode.GetString(b);
textBox4.Text = o;
}
}

private void button3_Click(object sender, EventArgs e)
{
//汉字转成GBK十六进制码：
string hz = textBox5.Text.ToString();
byte[] gbk = Encoding.GetEncoding("GBK").GetBytes(hz);
string s1 = ""; string s1d = "";
foreach (byte b in gbk)
{
//s1 += Convert.ToString(b, 16)+" ";
s1 += string.Format("{0:X2}", b) + " ";
s1d += b + " ";
}
textBox6.Text = s1;

}

private void button4_Click(object sender, EventArgs e)
{
//GBK十六进制码转成汉字：
string cd = textBox7.Text.ToString();
string[] b4 = cd.Split(' ');
byte[] bs = new byte[2];
bs[0] = (byte)Convert.ToByte(b4[0], 16);
bs[1] = (byte)Convert.ToByte(b4[1], 16);
textBox8.Text = Encoding.GetEncoding("GBK").GetString(bs);
}

private void button5_Click(object sender, EventArgs e)
{
string hz = textBox9.Text.ToString();
//汉字转成UTF-8十六进制码：
byte[] utf8 = Encoding.UTF8.GetBytes(hz);
string s3 = ""; string s3d = "";
foreach (byte b in utf8)
{
//s3 += Convert.ToString(b, 16) + " ";
s3 += string.Format("{0:X2}", b) + " ";
s3d += b + " ";
}
textBox10.Text = s3;
}

private void button6_Click(object sender, EventArgs e)
{
//UTF-8十六进制码转成汉字：
string cd = textBox11.Text.ToString();
string[] b6 = cd.Split(' ');
byte[] bs = new byte[3];
bs[0] = (byte)Convert.ToByte(b6[0], 16);
bs[1] = (byte)Convert.ToByte(b6[1], 16);
bs[2] = (byte)Convert.ToByte(b6[2], 16);
textBox12.Text = Encoding.GetEncoding("UTF-8").GetString(bs);
}

}
}