c# - 将 varbinary 位图从 SQL Server CE 加载到图片框中

Question

我正在尝试将预先保存的图像从 SQL Server CEVarBinary列加载到PictureBox.

列内容是以varbinary格式存储的位图图像。

MemoryStream ms = new MemoryStream();
byte[] outbyte = new byte[100];
Int32 ordinal = 0;

conn.Open();
SqlCeDataReader reader = cmd.ExecuteReader();

while (reader.Read())
{
     ordinal = reader.GetOrdinal("FaceStamp");//FaceStamp: VarBinary column storing Bmp.
     outbyte = (byte[])reader[ordinal];
     ms.Write(outbyte, 0, outbyte.Length);
     ms.Seek(0, SeekOrigin.Begin);
     pictureBox1.Image = Image.FromStream(ms);
}          

conn.Close();

// Code below is the code I used to save the Bitmap image to the database
Bitmap bmi = cam.GetBitmap(); // Capture image from webcam which I've tested working.
ImageConverter converter = new ImageConverter();
byte[] byteArray = new byte[0];
byteArray = (byte[])converter.ConvertTo(bmi, typeof(byte[])); 
insert.Parameters.AddWithValue("@image", byteArray);
insert.ExecuteNonQuery();

我在以下行收到错误：

pictureBox1.Image = Image.FromStream(ms);

说

{“参数无效。”}

有小费吗？

谢谢你。

Answer 1

在转换保存为字节数组的图像时，我通常会执行以下操作：

byte[] outbyte = (byte[])reader[ordinal];
using (MemoryStream ms = new MemoryStream(outbyte))
{
    Bitmap image = new Bitmap(ms);
    pictureBox1.Image = image;
}

要将原始图像转换为字节数组，您可以查看这个 SO question。