How to set wpf image source from string data? [duplicate] - wpf

Question

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How do you convert a byte array to a hexadecimal string, and vice versa?
(53 answers)
Closed 7 years ago.
I have a string value in cs code from [Image] column of mytable in mydatabase that type is varbinary(Max), now want to set value to source of Image control.
I wrote this code, but not set image to source :
string strImage = "0xFFD8FFE000104A46494600010....."
static byte[] GetBytes(string str)
{
byte[] bytes = new byte[str.Length * sizeof(char)];
System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
return bytes;
}
In constructor :
var bytes = GetBytes(strImage);
var myImage = new MyImageModel {Content = bytes};
MyImg.DataContext = myImage;
In Xaml:
<Image x:Name="MyImg" Source="{Binding Path=Content}"/>
The above code does not work and is not an error.

Answer 1

You can use a converter and bind your byte string to the Source property of the image. (So Content is your byte string)
<converters:BytesToImageConverter x:Key="BytesToImageConverter" />
<Image x:Name="MyImg" Source="{Binding Path=Content, Converter={StaticResource BytesToImageConverter}}"/>
Converter code:
public class BytesToImageConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value == null)
return null;
if (!(value is byte[]))
throw new ArgumentException("Only byte[] values are supported.");
if (((byte[])value).Length == 0)
return null;
// return new ImageSourceConverter().ConvertFrom(value);
BitmapImage image = new BitmapImage();
using (MemoryStream ms = new MemoryStream((byte[])value))
{
ms.Position = 0;
image.BeginInit();
image.CreateOptions = BitmapCreateOptions.PreservePixelFormat;
image.CacheOption = BitmapCacheOption.OnLoad;
image.UriSource = null;
image.StreamSource = ms;
image.EndInit();
}
image.Freeze();
return image;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
return value;
}
}

Answer 2

For converting string code to Image File Use the conversion Like this
public BitmapImage Base64ToImage( byte[] byteArray)
{
byteArray; // your bytes
BitmapImage img = new BitmapImage();
using (MemoryStream stream = new MemoryStream(byteArray))
{
img.BeginInit();
img.StreamSource = stream;
img.CacheOption = BitmapCacheOption.OnLoad;
img.EndInit();
img.Freeze();
}
return img;
}
It will Give you a Image you can Directly Bind this Image to UI