c# Base64编码和图片的互相转换代码

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;     }