How Can I Efficiently Load Images at Runtime in My WPF Application?

WPF Runtime Image Loading: A Comprehensive Guide

When developing a WPF application, you may need to dynamically load images at runtime. While this seems simple, there are some subtleties that need to be taken care of to display the image correctly.

Load image from URI

A common way to load images in WPF is to use the BitmapImage class. It supports loading images from URI, allowing you to specify remote and local image sources. For example, to load an image from a remote URL, you can use the following code:

var uri = new Uri("http://...");
var bitmap = new BitmapImage(uri);

Load image from local file path

Alternatively, if your image is stored locally, you can use the file:// URI by constructing it from a file path:

var path = Path.Combine(Environment.CurrentDirectory, "Bilder", "sas.png");
var uri = new Uri(path);

Load image as assembly resource

For images embedded as assembly resources, you should use the Pack URI scheme:

var uri = new Uri("pack://application:,,,/Bilder/sas.png");

Please make sure the image file has a "Resource" build action in Visual Studio.

Assign BitmapImage to Image control

After creating the BitmapImage, you need to assign it to the Source property of the Image control. This will display the image in the WPF window:

image1.Source = bitmap;

Troubleshooting: Resolving red squiggly lines in code

If a red squiggly line appears under your code, make sure you include the following using statement to import the necessary WPF namespace:

using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;

Also, please verify that the referenced image file exists in the correct path or assembly location.

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