我已将数据库中的Image保存为二进制文件：
Microsoft.Win32.OpenFileDialog fd = new Microsoft.Win32.OpenFileDialog();
if (fd.ShowDialog() == true)
{
ILogo.Source = new BitmapImage(new Uri(fd.FileName));
Stream stream = File.OpenRead(fd.FileName);
binaryImage = new byte[stream.Length];
stream.Read(binaryImage, 0, (int)stream.Length);
}
_merchantInfo.Logo = binaryImage;
我想阅读图片并显示图像工具，我试过这个：
_merchantInfo = new MerchantInfo();
_merchantInfo = _context.MerchantInfo.FirstOrDefault();
byte[] binaryPhoto = (byte[])_merchantInfo.Logo;
Stream stream = new MemoryStream(binaryPhoto);
_merchantLogo = new BitmapImage();
_merchantLogo.StreamSource = stream;
ILogo.Source = _merchantLogo;
无错误，但图像未显示在图像框中：（
我的代码中是否有错误？
感谢。
答案 0 :(得分：0)
最后我解决了这个问题，这里是存储的代码，并将数据库中的图像检索为二进制文件：
存储图像：
Microsoft.Win32.OpenFileDialog fd = new Microsoft.Win32.OpenFileDialog();
if (fd.ShowDialog() == true)
{
ILogo.Source = new BitmapImage(new Uri(fd.FileName));
Stream stream = File.OpenRead(fd.FileName);
binaryImage = new byte[stream.Length];
stream.Read(binaryImage, 0, (int)stream.Length);
}
_merchantInfo.Logo = binaryImage;
_context.SaveChanges();
图像检索和显示：
merchantInfo = new MerchantInfo();
_merchantInfo = _context.MerchantInfo.FirstOrDefault();
byte[] binaryPhoto = (byte[])_merchantInfo.Logo;
Stream stream = new MemoryStream(binaryPhoto);
_merchantLogo = new BitmapImage();
_merchantLogo.BeginInit();
_merchantLogo.StreamSource = stream;
_merchantLogo.EndInit();
ILogo.Source = _merchantLogo;
感谢大家帮助我：）
答案 1 :(得分：-1)
我创建了这个类，我正在使用它没有任何问题，尝试并分享它。
/// <summary>
/// created by Henka Programmer.
/// Class to make the converting images formats and data structs so easy.
/// This Class supporte the following types:
/// - BtimapImage,
/// - Stream,
/// - ByteImage
///
/// and the other option is image resizing.
/// </summary>
public class Photo
{
public BitmapImage BitmapImage;
public System.IO.Stream Stream;
public byte[] ByteImage;
public Photo(Uri PhotoUri)
{
this.BitmapImage = new BitmapImage(PhotoUri);
this.Stream = new MemoryStream();
this.Stream = this.BitmapImage.StreamSource;
this.ByteImage = StreamToByteArray(this.Stream);
}
public Photo(Bitmap Photo_Bitmap)
: this((ImageSource)(new ImageSourceConverter().ConvertFrom(Photo_Bitmap)))
{
/*
ImageSourceConverter c = new ImageSourceConverter();
byte[] bytes = (byte[])TypeDescriptor.GetConverter(Photo_Bitmap).ConvertTo(Photo_Bitmap, typeof(byte[]));
Photo ph = new Photo(bytes);*/
}
public Photo(ImageSource PhotoSource) : this(PhotoSource as BitmapImage) { }
public Photo(BitmapImage BitmapPhoto)
{
this.BitmapImage = BitmapPhoto;
this.ByteImage = GetByteArrayFromImageControl(BitmapPhoto);
this.Stream = new MemoryStream();
WriteToStream(this.Stream, this.ByteImage);
}
public Photo(string path)
{
try
{
this.Stream = System.IO.File.Open(path, System.IO.FileMode.Open);
this.BitmapImage = new BitmapImage();
BitmapImage.BeginInit();
BitmapImage.StreamSource = Stream;
BitmapImage.EndInit();
this.ByteImage = StreamToByteArray(this.Stream);
}
catch (Exception exception)
{
Debug.WriteLine(exception.Message);
}
}
public Photo(byte[] byteimage)
{
this.ByteImage = new byte[byteimage.Length];
this.ByteImage = byteimage;
// WriteToStream(this.Stream, this.ByteImage);
//MemoryStream ms = new MemoryStream(byteimage);
this.Stream = new MemoryStream(byteimage);
}
private void WriteToStream(Stream s, Byte[] bytes)
{
using (var writer = new BinaryWriter(s))
{
writer.Write(bytes);
}
}
private byte[] StreamToByteArray(Stream inputStream)
{
if (!inputStream.CanRead)
{
throw new ArgumentException();
}
// This is optional
if (inputStream.CanSeek)
{
inputStream.Seek(0, SeekOrigin.Begin);
}
byte[] output = new byte[inputStream.Length];
int bytesRead = inputStream.Read(output, 0, output.Length);
Debug.Assert(bytesRead == output.Length, "Bytes read from stream matches stream length");
return output;
}
private BitmapImage BitmapImageFromBytes(byte[] bytes)
{
BitmapImage image = new BitmapImage();
using (System.IO.MemoryStream imageStream = new System.IO.MemoryStream())
{
imageStream.Write(ByteImage, 0, ByteImage.Length);
imageStream.Seek(0, System.IO.SeekOrigin.Begin);
image.BeginInit();
image.CacheOption = BitmapCacheOption.OnLoad;
image.StreamSource = imageStream;
image.EndInit();
//image.Freeze();
}
return image;
}
public BitmapImage GetResizedBitmap(int width, int height)
{
ImageSource imgSrc = CreateResizedImage(this.ByteImage, width, height);
return new Photo(GetEncodedImageData(imgSrc, ".jpg")).BitmapImage;
}
private ImageSource CreateResizedImage(byte[] imageData, int width, int height)
{
BitmapImage bmpImage = new BitmapImage();
bmpImage.BeginInit();
if (width > 0)
{
bmpImage.DecodePixelWidth = width;
}
if (height > 0)
{
bmpImage.DecodePixelHeight = height;
}
bmpImage.StreamSource = new MemoryStream(imageData);
bmpImage.CreateOptions = BitmapCreateOptions.None;
bmpImage.CacheOption = BitmapCacheOption.OnLoad;
bmpImage.EndInit();
Rect rect = new Rect(0, 0, width, height);
DrawingVisual drawingVisual = new DrawingVisual();
using (DrawingContext drawingContext = drawingVisual.RenderOpen())
{
drawingContext.DrawImage(bmpImage, rect);
}
RenderTargetBitmap resizedImage = new RenderTargetBitmap(
(int)rect.Width, (int)rect.Height, // Resized dimensions
96, 96, // Default DPI values
PixelFormats.Default); // Default pixel format
resizedImage.Render(drawingVisual);
return resizedImage;
}
internal byte[] GetEncodedImageData(ImageSource image, string preferredFormat)
{
byte[] returnData = null;
BitmapEncoder encoder = null;
switch (preferredFormat.ToLower())
{
case ".jpg":
case ".jpeg":
encoder = new JpegBitmapEncoder();
break;
case ".bmp":
encoder = new BmpBitmapEncoder();
break;
case ".png":
encoder = new PngBitmapEncoder();
break;
case ".tif":
case ".tiff":
encoder = new TiffBitmapEncoder();
break;
case ".gif":
encoder = new GifBitmapEncoder();
break;
case ".wmp":
encoder = new WmpBitmapEncoder();
break;
}
if (image is BitmapSource)
{
MemoryStream stream = new MemoryStream();
encoder.Frames.Add(BitmapFrame.Create(image as BitmapSource));
encoder.Save(stream);
stream.Seek(0, SeekOrigin.Begin);
returnData = new byte[stream.Length];
BinaryReader br = new BinaryReader(stream);
br.Read(returnData, 0, (int)stream.Length);
br.Close();
stream.Close();
}
return returnData;
}
public byte[] GetByteArrayFromImageControl(BitmapImage imageC)
{
MemoryStream memStream = new MemoryStream();
JpegBitmapEncoder encoder = new JpegBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(imageC));
encoder.Save(memStream);
return memStream.GetBuffer();
}
public ImageSource ToImageSource()
{
ImageSource imgSrc = this.BitmapImage as ImageSource;
return imgSrc;
}
public System.Windows.Controls.Image ToImage()
{
System.Windows.Controls.Image Img = new System.Windows.Controls.Image();
Img.Source = this.ToImageSource();
return Img;
}
}