.NET Framework 4.7 to .NET 5 Migration with Galasoft MVVMLight Library

Question

We are migrating our WPF application to .NET 5.

Today we faced some problems with Galasoft Library named MVVMLight . We saw that there are no updates for .NET Standard. We cannot use ae EventToCommand class.

Do you know which options could we manage?

Answer 1

The regular MVVMLight and MVVMLightLibs NuGet packages are incompatible with .NET 5, they are only compatible with .NET Framwork and a few other platforms. However, there are dedicated packages for .NET Standard 1.0 which will work for .NET 5, too.

• MVVMLightStd10
• MVVMLightLibsStd10

You can read more about these versions on the offical MVVMLight web page here . Please be aware, that this version does not support the IServiceProvider interface.

One particular interface, IServiceProvider, which is used by the SimpleIoc component, is not available in .NET Standard 1.0. [...] the ServiceLocator class is not available anymore.

This affects SimpleIoC, which you have to get through the static SimpleIoc.Default member instead.

// OLD var nav = ServiceLocator.Current.GetInstance<INavigationService>();
// NEW
var nav = SimpleIoc.Default.GetInstance<INavigationService>();

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An alternative is to use the the XamlBehaviors for WPF if you are searching for a repacement for EventToCommand . This is a library by Microsoft that replaces the legacy Blend behaviors.

You can install the NuGet package Microsoft.Xaml.Behaviors.Wpf , which is compatible with .NET Framework, .NET Core and .NET 5. The equivalent to EventToCommand there is InvokeCommandAction .