如何从字节数组创建位图？

You'll need to get those bytes into a MemoryStream:

Bitmap bmp;
using (var ms = new MemoryStream(imageData))
{
bmp = new Bitmap(ms);
}

That uses the Bitmap(Stream stream) constructor overload.

UPDATE: keep in mind that according to the documentation, and the source code I've been reading through, an ArgumentException will be thrown on these conditions:

stream does not contain image data or is null.
-or-
stream contains a PNG image file with a single dimension greater than 65,535 pixels.

Can be as easy as:

var ms = new MemoryStream(imageData);
System.Drawing.Image image = Image.FromStream(ms);


image.Save("c:\\image.jpg");

Testing it out:

byte[] imageData;


// Create the byte array.
var originalImage = Image.FromFile(@"C:\original.jpg");
using (var ms = new MemoryStream())
{
originalImage.Save(ms, ImageFormat.Jpeg);
imageData = ms.ToArray();
}


// Convert back to image.
using (var ms = new MemoryStream(imageData))
{
Image image = Image.FromStream(ms);
image.Save(@"C:\newImage.jpg");
}

Guys thank you for your help. I think all of this answers works. However i think my byte array contains raw bytes. That's why all of those solutions didnt work for my code.

However i found a solution. Maybe this solution helps other coders who have problem like mine.

static byte[] PadLines(byte[] bytes, int rows, int columns) {
int currentStride = columns; // 3
int newStride = columns;  // 4
byte[] newBytes = new byte[newStride * rows];
for (int i = 0; i < rows; i++)
Buffer.BlockCopy(bytes, currentStride * i, newBytes, newStride * i, currentStride);
return newBytes;
}


int columns = imageWidth;
int rows = imageHeight;
int stride = columns;
byte[] newbytes = PadLines(imageData, rows, columns);


Bitmap im = new Bitmap(columns, rows, stride,
PixelFormat.Format8bppIndexed,
Marshal.UnsafeAddrOfPinnedArrayElement(newbytes, 0));


im.Save("C:\\Users\\musa\\Documents\\Hobby\\image21.bmp");

This solutions works for 8bit 256 bpp (Format8bppIndexed). If your image has another format you should change PixelFormat .

And there is a problem with colors right now. As soon as i solved this one i will edit my answer for other users.

*PS = I am not sure about stride value but for 8bit it should be equal to columns.

And also this function Works for me.. This function copies 8 bit greyscale image into a 32bit layout.

public void SaveBitmap(string fileName, int width, int height, byte[] imageData)
{


byte[] data = new byte[width * height * 4];


int o = 0;


for (int i = 0; i < width * height; i++)
{
byte value = imageData[i];




data[o++] = value;
data[o++] = value;
data[o++] = value;
data[o++] = 0;
}


unsafe
{
fixed (byte* ptr = data)
{


using (Bitmap image = new Bitmap(width, height, width * 4,
PixelFormat.Format32bppRgb, new IntPtr(ptr)))
{


image.Save(Path.ChangeExtension(fileName, ".jpg"));
}
}
}
}

In addition, you can simply convert byte array to Bitmap.

var bmp = new Bitmap(new MemoryStream(imgByte));

You can also get Bitmap from file Path directly.

Bitmap bmp = new Bitmap(Image.FromFile(filePath));

This was helpful to me: https://www.tek-tips.com/viewthread.cfm?qid=1264492 (Reference answer)

I understand the question as follows:

• I have a byte array that contains pixel data e.g. in RGB format (24bit/pixel)
• From this raw pixel data I want to create a Bitmap

This code worked for me:

int width = ...;
int height = ...;
byte[] pixelArray = new byte[] {
// Creation of the actual data is not in the scope of this answer
};


Bitmap bmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppRgb);


// Create a BitmapData and lock all pixels to be written
BitmapData bmpData = bmp.LockBits(
new Rectangle(0, 0, bmp.Width, bmp.Height),
ImageLockMode.WriteOnly, bmp.PixelFormat);
// Copy the data from the byte array into BitmapData.Scan0
Marshal.Copy(pixelArray, 0, bmpData.Scan0, pixelArray.Length);


// Unlock the pixels
bmp.UnlockBits(bmpData);


// Do something with your image, e.g. save it to disc
bmp.Save("c:\\temp\\mybmp.bmp", ImageFormat.Bmp);