将图片转化为Base64字符串的流程是：首先使用BinaryFormatter将图片文件序列化为二进制数据，然后使用Convert类的ToBase64String方法。将Base64字符串转换为图片的流程正好相反：使用Convert类的FromBase64String得到图片文件的二进制数据，然后使用BinaryFormatter反序列化方法。
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/// <summary> /// 将图片数据转换为Base64字符串
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ToBase64(object sender, EventArgs e)
{
Image img = this.pictureBox.Image;
BinaryFormatter binFormatter = new BinaryFormatter();
MemoryStream memStream = new MemoryStream();
binFormatter.Serialize(memStream, img);
byte[] bytes = memStream.GetBuffer();
string base64 = Convert.ToBase64String(bytes);
this.richTextBox.Text = base64;
}
/// <summary>
/// 将Base64字符串转换为图片
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ToImage(object sender, EventArgs e)
{
string base64 = this.richTextBox.Text;
byte[] bytes = Convert.FromBase64String(base64);
MemoryStream memStream = new MemoryStream(bytes);
BinaryFormatter binFormatter = new BinaryFormatter();
Image img = (Image)binFormatter.Deserialize(memStream);
this.pictureBox.Image = img;
}
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