如何将位图转换为byte[]？
如何将位图转换为byte[]？
提问于 2008-11-06 09:09:50
基本上，我使用listviews插入事件插入图像，尝试从fileupload控件调整图像大小，然后使用LINQ将其保存到SQL数据库中。
我在fileupload控件中找到了一些代码来创建内容的新位图，但这是将其存储在服务器上的一个文件中，来自this source，但我需要将位图保存回SQL数据库，我认为我需要将其转换回byte[]格式。
那么如何将位图转换为byte[]格式呢？
如果我做错了这件事，我会很感激你能纠正我。
下面是我的代码：
// Find the fileUpload control
string filename = uplImage.FileName;
// Create a bitmap in memory of the content of the fileUpload control
Bitmap originalBMP = new Bitmap(uplImage.FileContent);
// Calculate the new image dimensions
int origWidth = originalBMP.Width;
int origHeight = originalBMP.Height;
int sngRatio = origWidth / origHeight;
int newWidth = 100;
int newHeight = sngRatio * newWidth;
// Create a new bitmap which will hold the previous resized bitmap
Bitmap newBMP = new Bitmap(originalBMP, newWidth, newHeight);
// Create a graphic based on the new bitmap
Graphics oGraphics = Graphics.FromImage(newBMP);
// Set the properties for the new graphic file
oGraphics.SmoothingMode = SmoothingMode.AntiAlias;
oGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
// Draw the new graphic based on the resized bitmap
oGraphics.DrawImage(originalBMP, 0, 0, newWidth, newHeight);
PHJamesDataContext db = new PHJamesDataContext();
System.IO.MemoryStream stream = new System.IO.MemoryStream();
newBMP.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);
stream.Position = 0;
byte[] data = new byte[stream.Length];
PHJProjectPhoto myPhoto =
new PHJProjectPhoto
{
ProjectPhoto = data,
OrderDate = DateTime.Now,
ProjectPhotoCaption = ProjectPhotoCaptionTextBox.Text,
ProjectId = selectedProjectId
};
db.PHJProjectPhotos.InsertOnSubmit(myPhoto);
db.SubmitChanges();回答 3
Stack Overflow用户
回答已采纳
发布于 2008-11-06 09:18:04
您应该能够将此块更改为
System.IO.MemoryStream stream = new System.IO.MemoryStream();
newBMP.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);
PHJProjectPhoto myPhoto =
new PHJProjectPhoto
{
ProjectPhoto = stream.ToArray(), // <<--- This will convert your stream to a byte[]
OrderDate = DateTime.Now,
ProjectPhotoCaption = ProjectPhotoCaptionTextBox.Text,
ProjectId = selectedProjectId
};Stack Overflow用户
发布于 2008-11-06 09:16:02
如果您已经有了MemoryStream，只需调用MemoryStream.ToArray获取数据即可。
Stack Overflow用户
发布于 2008-11-06 09:15:27
假设您的位图是bmp
byte[] data;
using(System.IO.MemoryStream stream = new System.IO.MemoryStream()) {
bmp.Save(stream, System.Drawing.Imaging.ImageFormat.Bmp);
stream.Position = 0;
data = new byte[stream.Length];
stream.Read(data, 0, stream.Length);
stream.Close();
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/268013
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