C＃转换为字节数组

Question

How can i convert this VBNet code into C#? ( ByteToImage is a User Defined Function use to convert Byte Array into Bitmap.

Dim Bytes() As Byte = CType(SQLreader("ImageList"), Byte())
picStudent.Image = jwImage.ByteToImage(Bytes)

I tried

byte[] Bytes = Convert.ToByte(SQLreader("ImageList")); // Error Here
picStudent.Image = jwImage.ByteToImage(Bytes);

but it generates an error saying: Cannot implicitly convert type 'byte' to 'byte[]'

What i am doing is basically converting an Image from database to byte array and displaying it on the picturebox.

Answer 1

byte[] Bytes = (byte[]) SQLreader("ImageList"); 
picStudent.Image = jwImage.ByteToImage(Bytes);

Answer 2

Try this

byte[] Bytes = (byte[])SQLreader("ImageList");

Hope this helps

Answer 3

The problem is you have an array of bytes ( byte[] in C# and Byte() in VB.Net) but the Convert.ToByte call just returns a simple byte . To make this work you need to cast the return of SQLreader to byte[] .

There is no perfect analogous construct for CType in C# but a simple cast here should do the trick

byte[] Bytes = (byte[])SQLreader("ImageList");

Answer 4

CType is the equivalent of a type cast, not an actual conversion.Besides, Convert.ToByte tries to convert its input to a single byte, not an array. The equivalent code is

byte[] bytes=(byte[])SQLreader("ImageList");