求大神帮帮忙啊，帮我看看这样写那有问题，c#简单加密问题

[北漂90后大叔]

老手让把文件转换成byst[],并把其中的数+1，简单的加密，使文件让其他人打不开，然后再把刚刚的过程反过来，使byst[]中的数-1，使文件解密，我写了下面的代码，但是只能执行一次+1或-1，不能再反过来解密刚毕业，啥也不会，求解救！！！咋解决，跪求啊

private void button3_Click(object sender, EventArgs e)
        {
            FileStream fs = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read);
            byte[] infbytes = new byte[fs.Length];
            fs.Read(infbytes, 0, infbytes.Length);
            fs.Close();
            byte[] bytes={};
            int[] inn = { };

            for (int i = 0; i == infbytes.Length; i++)
            {
                 inn[i] = infbytes[i]+1;
                 bytes[i] = (byte)inn[i];
            }

            File.WriteAllBytes(textBox1.Text, bytes);
                MessageBox.Show("加密成功");
        }

        private void button4_Click(object sender, EventArgs e)
        {
            FileStream fs = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read);
            byte[] infbytes = new byte[fs.Length];
            fs.Read(infbytes, 0, infbytes.Length);
            fs.Close();
            byte[] bytes = {};
            int[] inn = { };

            for (int i = 0; i == infbytes.Length; i++)
            {
                inn[i] = infbytes[i] - 1;
                bytes[i] = (byte)inn[i];
            }

            File.WriteAllBytes(textBox1.Text, bytes);
            MessageBox.Show("解密成功");
        }

错误如下：

[wg5945]

i < infbytes.Length

[Poopaye]

我很好奇是谁教你这样写for循环的？可以揍他。

[本拉灯]

byte[] bytes=new byte[infbytes.Length]; int[] inn = new byte[infbytes.Length]; for (int i = 0; i <= infbytes.Length; i++) { inn[i] = infbytes[i]+1; bytes[i] = (byte)inn[i]; } byte[] bytes=new byte[infbytes.Length]; int[] inn = new byte[infbytes.Length]; for (int i = 0; i <= infbytes.Length; i++) { inn[i] = infbytes[i]-1; bytes[i] = (byte)inn[i]; }

[crystal_lz]

引用 3 楼 wyd1520 的回复:

byte[] bytes=new byte[infbytes.Length]; int[] inn = new byte[infbytes.Length]; for (int i = 0; i <= infbytes.Length; i++) { inn[i] = infbytes[i]+1; bytes[i] = (byte)inn[i]; } byte[] bytes=new byte[infbytes.Length]; int[] inn = new byte[infbytes.Length]; for (int i = 0; i <= infbytes.Length; i++) { inn[i] = infbytes[i]-1; bytes[i] = (byte)inn[i]; }

你和他是同一个老师吗？ <=

[北漂90后大叔]

各位，大神，快！求解救啊，别老笑了[/img][/img]

[北漂90后大叔]

引用 1 楼 wg5945 的回复:

i < infbytes.Length

写成小于也不行啊！！！大神求解救啊！！！

[ajianchina]

搞定了别忘记结贴

private void button3_Click(object sender, EventArgs e)
{
	FileStream fs = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read);
	BinaryReader r = new BinaryReader(fs);
	r.BaseStream.Seek(0, SeekOrigin.Begin);
	byte[] bytes = r.ReadBytes((int)r.BaseStream.Length);
	for(int i = 0;i<bytes.Length;i++)
	{
		bytes[i] += 1;
	}
	File.WriteAllBytes(textBox1.Text, bytes);
	MessageBox.Show("加密成功");
}

private void button4_Click(object sender, EventArgs e)
{
	FileStream fs = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read);
	BinaryReader r = new BinaryReader(fs);
	r.BaseStream.Seek(0, SeekOrigin.Begin);
	byte[] bytes = r.ReadBytes((int)r.BaseStream.Length);
	for (int i = 0; i < bytes.Length; i++)
	{
		bytes[i] -= 1;
	}
	File.WriteAllBytes(textBox1.Text, bytes);
	MessageBox.Show("解密成功");
}

[ajianchina]

没测，上面的代码应该会有异常，加一下释放

private void button3_Click(object sender, EventArgs e)
{
	byte[] bytes;
	using (FileStream fs = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read))
	{
		BinaryReader r = new BinaryReader(fs);
		r.BaseStream.Seek(0, SeekOrigin.Begin);
		bytes = r.ReadBytes((int)r.BaseStream.Length);
		for (int i = 0; i < bytes.Length; i++)
		{
			bytes[i] += 1;
		}
	   
	}
	File.WriteAllBytes(textBox1.Text, bytes);
	MessageBox.Show("加密成功");
}




private void button4_Click(object sender, EventArgs e)
{
	byte[] bytes;
	using (FileStream fs = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read))
	{
		BinaryReader r = new BinaryReader(fs);
		r.BaseStream.Seek(0, SeekOrigin.Begin);
		bytes = r.ReadBytes((int)r.BaseStream.Length);
		for (int i = 0; i < bytes.Length; i++)
		{
			bytes[i] -= 1;
		}
	}
	File.WriteAllBytes(textBox1.Text, bytes);
	MessageBox.Show("解密成功");
}

[北漂90后大叔]

引用 7 楼 ajianchina 的回复:

搞定了别忘记结贴

private void button3_Click(object sender, EventArgs e)
{
	FileStream fs = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read);
	BinaryReader r = new BinaryReader(fs);
	r.BaseStream.Seek(0, SeekOrigin.Begin);
	byte[] bytes = r.ReadBytes((int)r.BaseStream.Length);
	for(int i = 0;i<bytes.Length;i++)
	{
		bytes[i] += 1;
	}
	File.WriteAllBytes(textBox1.Text, bytes);
	MessageBox.Show("加密成功");
}

private void button4_Click(object sender, EventArgs e)
{
	FileStream fs = new FileStream(textBox1.Text, FileMode.Open, FileAccess.Read);
	BinaryReader r = new BinaryReader(fs);
	r.BaseStream.Seek(0, SeekOrigin.Begin);
	byte[] bytes = r.ReadBytes((int)r.BaseStream.Length);
	for (int i = 0; i < bytes.Length; i++)
	{
		bytes[i] -= 1;
	}
	File.WriteAllBytes(textBox1.Text, bytes);
	MessageBox.Show("解密成功");
}

谢谢大哥，必须结贴，终于下班了！