Setting image source in view model in .NET MAUI app

Question

In my .NET MAUI app, I want to be able to set my image source by binding it to a property in my view model -- see below:

public partial class MyViewModel : BaseViewModel
{
   [ObservableProperty]
   ImageSource myImageSource;

   void Init()
   {
        if(somevalue == "something")
           MyImageSource = ImageSource.FromFile("image_a.png");
        else
           MyImageSource = ImageSource.FromFile("image_b.png");
   }
}

And in my XAML page< I do this:

<Image
   Source{Binding MyImageSource}
   HeightRequest="30"
   HorizontalOptions="Center"
   VerticalOptions="Center" />

This doesn't display the image but no errors. In my view model, I also tried MyImageSource = ImageSource.FromResource("MyProject.Resources.Images.image_a.png"); which also doesn't display the image.

The images I want to display are in Resources > Images folder.

What am I doing wrong here? How do I set the image source to a file in a folder under Resources through my view model?

What is your property type in the view model? string or ImageSource? — Sam
– Sam, Commented Mar 10, 2023 at 6:20
Also, do you just use the filename or include the path as well? So far, I tried it as string with just filename and it doesn't work. — Sam
– Sam, Commented Mar 10, 2023 at 6:23

H.A.H. · Accepted Answer · 2023-03-10 06:32:16Z

11

In project:

<MauiImage Include="Resources\Images\*" />

File in folder:

Resources/Images/dotnet_bot.svg

Define:

[ObservableProperty]
ImageSource image;

Use:

Image = "dotnet_bot.png";

answered Mar 10, 2023 at 6:32

H.A.H.

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2 Comments

dpant Feb 9 at 10:08

What if the image file is in the cache directory of the device? For example, what if the image file is created like this: var filePath = Path.Combine(FileSystem.CacheDirectory, Path.GetRandomFileName()); using var fileStream = File.Create(filePath);

H.A.H. Feb 10 at 19:23

@dpant You can get image source from file, uri or stream. learn.microsoft.com/en-us/dotnet/api/…

Jessie Zhang -MSFT · Accepted Answer · 2023-03-10 07:45:23Z

2

A method is to set your images's Build Action to Embedded resource and set value for MyImageSource in your view Model constructor,just as follows:

public partial  class MyViewModel:ObservableObject 
    {
        [ObservableProperty]
        ImageSource myImageSource;
    
        public MyViewModel()
        {
            MyImageSource = ImageSource.FromResource("YourAppName.Resources.Images.test.png", typeof(MyViewModel).GetTypeInfo().Assembly); 
        }
       
        }
    }

And bind like this:

<Image   Source="{Binding MyImageSource }" Aspect="AspectFill" WidthRequest="50"   HeightRequest="50" />

Note:

1.YourAppName is the name of the app,you can change it to yours.

2.Please change your images' Build Action to Embedded resource

answered Mar 10, 2023 at 7:45

Jessie Zhang -MSFT

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2 Comments

Anurag Over a year ago

Where do we find the App Name in the project?

Christophe Sep 22 at 20:20

In csproj file. In your solution, double click the name of your project. It will open the csproj for that project. Then you can see ApplicationTitle

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