基于单选按钮选择在运行时更改图像

Question

I need to change the background image at runtime, based on which RadioButton the user clicks. I'm doing this in a WPF project in Visual Studio, and I need to put the code in the Checked event in the xaml.cs file

I have an Image control called imgBackground, with 6 images in its Source collection, which are listed in an Images folder in the Solution Explorer.

I've tried:

this.imgBackground.Source = "filename.jpg";

both with and without the quotes, and with various paths (I've tried too many different variations to list them all here) and nothing works - everything I've tried just gives an error in the editor, before I even try to build and run anything (the error given varies depending on what I'm trying at the time).

Answer 1

If you are using relative paths as filenames like

this.imgBackground.Source = "filename.jpg";

then these files must be in the same directory as the .exe of your program is. One workaround would be to use absolute paths like

this.imgBackground.Source = @"C:\MyFolder\MyProject\filename.jpg";

Or, even further use the packaging mechanism of WPF or pack your images as resources into your assembly. Look at this thread.

EDIT:

For your clarification:

The Source -property demands an System.Windows.Media.ImageSource -object, which you must provide. Do it like this:

BitmapImage bi3 = new BitmapImage();
bi3.BeginInit();
bi3.UriSource = new Uri("filename.jpg", UriKind.Relative);
bi3.EndInit();
this.imgBackground.Source = bi3;

Please refer to this documentation here.