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1.To display the images in Xamarin.Forms, try placing the image file in the resource folder of the each platform project. Or if you place the files in the shared project, please set the Build Action to EmbeddedResource.
To load images in Xamarin.Forms, you could check this document:
2.For the file which is set Build Action to Content, the VS provides to Application.GetContentStream method to access the file. But it is only supported in ASP.NET, it doesn't work in the .Net Standard referenced by Xamarin.Forms.
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