Storing WPF Image Resources

In code to load a resource in the executing assembly where my image Freq.png was in the folder Icons and defined as Resource:

this.Icon = new BitmapImage(new Uri(@"pack://application:,,,/" 
    + Assembly.GetExecutingAssembly().GetName().Name 
    + ";component/" 
    + "Icons/Freq.png", UriKind.Absolute)); 

I also made a function:

/// <summary>
/// Load a resource WPF-BitmapImage (png, bmp, ...) from embedded resource defined as 'Resource' not as 'Embedded resource'.
/// </summary>
/// <param name="pathInApplication">Path without starting slash</param>
/// <param name="assembly">Usually 'Assembly.GetExecutingAssembly()'. If not mentionned, I will use the calling assembly</param>
/// <returns></returns>
public static BitmapImage LoadBitmapFromResource(string pathInApplication, Assembly assembly = null)
{
    if (assembly == null)
    {
        assembly = Assembly.GetCallingAssembly();
    }

    if (pathInApplication[0] == '/')
    {
        pathInApplication = pathInApplication.Substring(1);
    }
    return new BitmapImage(new Uri(@"pack://application:,,,/" + assembly.GetName().Name + ";component/" + pathInApplication, UriKind.Absolute)); 
}

Usage (assumption you put the function in a ResourceHelper class):

this.Icon = ResourceHelper.LoadBitmapFromResource("Icons/Freq.png");

Note: see MSDN Pack URIs in WPF:
pack://application:,,,/ReferencedAssembly;component/Subfolder/ResourceFile.xaml

Some people are asking about doing this in code and not getting an answer.

After spending many hours searching I found a very simple method, I found no example and so I share mine here which works with images. (mine was a .gif)

Summary:

It returns a BitmapFrame which ImageSource "destinations" seem to like.

Use:

doGetImageSourceFromResource ("[YourAssemblyNameHere]", "[YourResourceNameHere]");

Method:

static internal ImageSource doGetImageSourceFromResource(string psAssemblyName, string psResourceName)
{
    Uri oUri = new Uri("pack://application:,,,/" +psAssemblyName +";component/" +psResourceName, UriKind.RelativeOrAbsolute);
    return BitmapFrame.Create(oUri);
}

Learnings:

From my experiences the pack string is not the issue, check your streams and especially if reading it the first time has set the pointer to the end of the file and you need to re-set it to zero before reading again.

I hope this saves you the many hours I wish this piece had for me!

If you're using Blend, to make it extra easy and not have any trouble getting the correct path for the Source attribute, just drag and drop the image from the Project panel onto the designer.