Odd image.source behavior in WPF

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I have .PNG files in the debug folder that I use as imagebrushes and diffusematerials with no issue. I.E.:

C#

myImageBrush.ImageSource = New BitmapImage(New Uri("image0.png", UriKind.Relative))

Now I have two Image controls and I set the source I.E.:

C#

myImage.Source = New BitmapImage(New Uri("image0.png", UriKind.Relative))

Nothing appears.

What I have tried:

Unless I set a breakpoint, inspect the Image in debug AND expand the source section and scroll to the bottom and then continue. If I do that, the image displays - I don't have to do anything else.

SO I have .PNG files that work fine - except on Image controls. If I expand the Image details in debug mode, I have no issue, otherwise the Image simply doesn't display.

Any idea what is going on?

Posted 7-Sep-23 18:59pm

kamikazehighland

Updated 8-Sep-23 9:52am

Deeksha Shenoy

v2

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Comments

Richard MacCutchan 8-Sep-23 5:33am

Where is the code that actually paints the image?

kamikazehighland 8-Sep-23 8:09am

Private myImage As New Image

Private Sub Window_Loaded(sender As Object, e As RoutedEventArgs)
myImage.Margin = New Thickness(12, 12, 0, 0)
myImage.HorizontalAlignment = HorizontalAlignment.Left
myImage.Width = 100
myImage.Source = New BitmapImage(New Uri("image0.png", UriKind.Relative))
myGrid.Children.Add(myImage)
End Sub

Richard MacCutchan 8-Sep-23 10:20am

Take a look at How to: Use the Image Element - WPF .NET Framework | Microsoft Learn[^], it shows how you should set imager properties.

[no name] 8-Sep-23 11:16am

Add an "ImageFailed" event handler. Since you're doing "relative" addressing, it probable couldn't find the image "relative" to the image control.

https://learn.microsoft.com/en-us/dotnet/api/system.windows.controls.image.imagefailed?view=windowsdesktop-7.0

kamikazehighland 8-Sep-23 12:54pm

It's odd that "New BitmapImage(New Uri("image0.png", UriKind.Relative))" works well for Imagebrushes but not Images. I put the full path with UriKind.Absolute and it works with no issue. And especially odd that when I pause and view the Source info that makes it work all of a sudden.

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Member 11634771 · Answer 1 · 2024-03-14T04:12:00

I'm so late, but
how about my suggestion?

var bitmapImage = new BitmapImage();

bitmapImage.BeginInit();

bitmapImage.UriSource = new Uri("pen.png", UriKind.RelativeOrAbsolute);

bitmapImage.CacheOption = BitmapCacheOption.OnLoad;

bitmapImage.EndInit();

MyImage.Source = bitmapImage;

from WPF Relative Image Path Problem (BitmapImage and UriSource) ~ Ladofa[^]