C# 使用Base64编码实现图片的上传

效果图

 

 代码如下

//选择图片

OpenFileDialog ofd = new OpenFileDialog();
ofd.Title = "选择要上传的图片";
ofd.Filter = "All Files(*.*)|*.*|位图(*.bmp)|*.bmp|JPEG(*.jpg)|*.jpg";
ofd.ShowDialog();
textBox1.Text = ofd.FileName;
if (!File.Exists(ofd.FileName))
{
MessageBox.Show("???");
return;
}

////////////

//上传图片

string strPath = textBox1.Text.Trim();
System.IO.MemoryStream m = new System.IO.MemoryStream();
System.Drawing.Bitmap bp = new System.Drawing.Bitmap(strPath);
bp.Save(m, System.Drawing.Imaging.ImageFormat.Png);
byte[] b = m.GetBuffer();
string base64string = Convert.ToBase64String(b);
//自己写入库操作

............

 

//////////

//显示图片    解码

//查询操作

............

byte[] imageBytes=Convert.FromBase64String(base编码);

MemoryStream memoryStream = new MemoryStream(imageBytes, 0, imageBytes.Length);

memoryStream.Write(imageBytes, 0, imageBytes.Length);
Image image = Image.FromStream(memoryStream);
this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
this.pictureBox1.Image = image;