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[英]How can I check if I have an image from my SQL Server database or not using C#
[英]How can I add an image in my database sqlite using dbContext WPF c#?
我想以字節形式在圖像列中將圖像添加到數據庫中,我正在使用SQLite保存數據庫數據,並使用dbContext c#編寫了WPF應用程序以編寫代碼
有人可以幫我嗎?
private void ChooseImageButtonClick(object sender, RoutedEventArgs e)
{
Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
dlg.Filter = "Choose Image(*.JPG;*.PNG;*.GIF)|*.jpg;*.png;*.gif";
if (dlg.ShowDialog() == true)
{
string FileName = dlg.FileName.ToString();
BitmapImage bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.UriSource = new Uri(FileName);
bitmap.EndInit();
ImageBox.Source = bitmap;
}
}
private void savebtnClick(object sender, RoutedEventArgs e)
{
using (DatabaseContext dbContext = new DatabaseContext())
{
Person p = new Person
{
Id = int.Parse(Idtextbox.Text),
Name = Nametextbox.Text,
Image = image
};
dbContext.Person.Add(p);
dbContext.SaveChanges();
RefreshList();
}
}
只需先將BitmapImage轉換為字節數組
byte[] image;
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
encoder.QualityLevel = 100;
using (MemoryStream ms = new MemoryStream())
{
encoder.Frames.Add(BitmapFrame.Create((BitmapSource)ImageBox.Source));
encoder.Save(ms);
image = ms.ToArray();
}
encoder = null;
並在您的數據庫上下文中-添加
using (DatabaseContext dbContext = new DatabaseContext())
{
Part part = new Part();
part.Id = int.Parse(TextBoxID.Text);
part.Name = TextBoxName.Text;
part.Image = image;
dbContext.Part.Add(part);
dbContext.SaveChanges();
RefreshPartsList();
}}
要將字節數組轉換回BitmapImage:
byte[] imageData = part.Image; // that you get from db
if (imageData == null || imageData.Length == 0)
{
//Show error msg or return here;
return;
}
var image = new BitmapImage();
using (var ms = new System.IO.MemoryStream(imageData))
{
image.BeginInit();
image.CacheOption = BitmapCacheOption.OnLoad;
image.StreamSource = ms;
image.EndInit();
image.Freeze();
}
在“零件”類中添加屬性
public byte[] ImageCol { get; set; }
然后從“ OpenFileDialog”中從所選文件創建圖像。 例如
OpenFileDialog openFileDialog = new OpenFileDialog
{
Filter = "Image Files(*.BMP;*.JPG;*.JPEG;*.GIF;*.PNG)|*.BMP;*.JPG;*.JPEG;*.GIF;*.PNG",
InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
};
if (openFileDialog.ShowDialog()==DialogResult.OK)
{
var imageFromFile = System.Drawing.Image.FromFile(openFileDialog.FileName);
part.ImageCol = imageFromFile.ConvertBitmapImagetoBytes();
}
將位圖轉換為字節[]
public static byte[] ConvertBitmapImagetoBytes(this Image image)
{
MemoryStream ms = new MemoryStream();
image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
return ms.ToArray();
}
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