TROUBLESHOOTING DURING .NET6 MIGRATION

NET6 migration, there are some general issues that need to be addressed independent of Next Design.
Here are some issues that the Next Design development team has encountered and how to resolve them for your reference.

For more information, please refer to the official Microsoft literature.

Error due to unavailability of namespace in System.Windows.Forms.

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NET6, if the UseWindowsForms attribute is not set to true in the project file, the System.Windows.Forms namespace is not available and an error will occur.

Example code using the System.Windows.Forms namespace:

using System.Windows.Forms;
					
namespace MyExt
{
	/// <summary>
	/// エクステンションのエントリポイントです
	/// </summary>
	public class MyExtEntryPoint : ExtensionBase
	{
		/// <summary>
		/// アクティベート時の処理です。
		/// </summary>
		protected override void OnActivate()
		{
			var form = new Form();
		}
	}
}

Solution

Set the UseWindowsForms attribute to true in the project file that references the System.Windows.Forms namespace. To set the setting, edit the project file (project name.csproj) using Visual Studio or a text editor.

Example of a project file before resolution:

<!--csprojの設定-->
<Project Sdk="Microsoft.NET.Sdk">

	<PropertyGroup>
		<TargetFramework>net6.0-windows</TargetFramework>
	</PropertyGroup>

</Project>

Example of a resolved project file:

<!--csprojの設定-->
<Project Sdk="Microsoft.NET.Sdk">

	<PropertyGroup>
		<TargetFramework>net6.0-windows</TargetFramework>
		<UseWindowsForms>true</UseWindowsForms>
	</PropertyGroup>

</Project>

Reactive Extensions interface does not exist and an error occurs

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NET6, the following interfaces in Reactive Extensions (hereafter referred to as Rx) have changed, NET6, the following interfaces in Reactive Extensions (hereafter referred to as Rx) have been changed, which may result in errors.

Code Example:

m_TargetEventSubscription =
Throttle(EventThrottleSpan, DispatcherScheduler.Current)
.ObserveOnDispatcher(DispatcherPriority)
.SubscribeSafely(m_Handler, HandleEvent);.

Solution

This can be resolved by restoring the interface with reference to the following official Rx program.

The image will not be displayed.

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NET6, the Sdk setting in the project file is Microsoft.NET.Sdk and the UseWPF attribute is not set to true the icons contained in that project will not be displayed when referenced from other projects.
This attribute may not be true for projects that do not implement views using WPF, for example.

Example of project setup:

<!--csprojの設定-->
<Project Sdk="Microsoft.NET.Sdk">

	<PropertyGroup>
		<TargetFramework>net6.0-windows</TargetFramework>
	</PropertyGroup>

</Project>

Solution

Set the UseWPF attribute to true in the project file. To set, edit the project file (project name.csproj) in Visual Studio or a text editor.

Example of project setup:

<!--csprojの設定-->
<Project Sdk="Microsoft.NET.Sdk">

	<PropertyGroup>
		<TargetFramework>net6.0-windows</TargetFramework>
		<UseWPF>
	</PropertyGroup>

</Project>

Warning displayed for null comparison with System.Windows.GridLength

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IN .NET6 GridLength will no longer tolerate null.
Therefore, GridLength A warning is issued if an implementation is comparing objects of type null.

Code Example:

var length = new GridLength();
if(length == null)
{
	// ...
}

Warning message:

The value of type 'GridLength' is never equal to 'null' of type 'GridLength?

Solution

GridLength will never be null, so remove unnecessary implementations that are being compared to null.

Code Example:

var length = new GridLength();.
// ...