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FileStream f = new FileStream("dizhi",FileMode.Open,FileAccess.Read);
BinaryReader b = new BinaryReader(f);
byte[] byteImage = b.ReadBytes((int)f.Length);
MemoryStream m = new MemoryStream((byte[])byteImage);
Image image = Image.formStream(m);
private static void TestImageFromStream()
{
string str = @"http://www.XXXX.1.gif";
FileStream fs = new FileStream(str, FileMode.Open, FileAccess.Read);
BinaryReader by = new BinaryReader(fs);
int length = (int)fs.Length;
byte[] imgbyte = by.ReadBytes(length);
MemoryStream ms = new MemoryStream(imgbyte);
ms.Seek(0, SeekOrigin.Begin);
Image image = Image.FromStream(ms);
}