How Can I Import one .net framework WPFControl or one .net5 WPFControl into The new .net5 Winform?

Question

I've tried to used a .net framework WPFUserControl into the .net5 WPF (.net framework WPF certainly too) , and how can I use this control into my .NET5 Winform? I guess .NET5 Winform can't use ElementHost anymore.right?

Answer 1

No, you can use ElementHost in WinForm to host WPF Control in .Net5, but you need to use the newer version of 2019. I test a .Net5 WinForm project to host WPF DataGrid in Visual Studio Enterprise 2019 Version 16.8.1.
Here is my steps and code for you:
Step 1: Create a .Net5 Winform project named WPNet5 and make it's .csproj as below:

<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">  
  
  <PropertyGroup>  
    <OutputType>WinExe</OutputType>  
    <TargetFramework>net5.0-windows</TargetFramework>  
    <UseWindowsForms>true</UseWindowsForms>  
    <UseWPF>true</UseWPF>  
  </PropertyGroup>  
  
</Project>  

Step 2: Add a WPF UserControl named WPFControls

Step 3: Code for WPFControls.xaml

 <Grid>  
        <DataGrid x:Name="dataGrid" ItemsSource="{Binding }" AutoGenerateColumns="False"  SelectionMode="Extended" SelectionUnit="CellOrRowHeader" >  
            <DataGrid.Columns>  
                <DataGridTextColumn Header="Name" Width="80" Binding="{Binding Name}"/>  
                <DataGridTextColumn Header="Age" Width="50" Binding="{Binding Age}" />  
                <DataGridHyperlinkColumn Header="Email" Width="150"   Binding="{Binding Email}"/>  
            </DataGrid.Columns>  
        </DataGrid>  
    </Grid>  

WPFControls.cs

 public partial class WPFControls : UserControl  
        {  
            public WPFControls()  
            {  
                InitializeComponent();  
                ObservableCollection<Member> memberData = new ObservableCollection<Member>();  
                Random radom = new Random();  
                for (int i = 1; i < 20; i++)  
                {  
                    Member men = new Member();  
                    men.Age = radom.Next(100).ToString();  
                    men.Name = "JOE" + i.ToString();  
                    men.Email = new Uri("mailto:JOE" + i.ToString() + "+@school.com");  
                    memberData.Add(men);  
                }  
                dataGrid.DataContext = memberData;  
            }  
      
        }  
      
        public class Member  
        {  
            public string Name { get; set; }  
            public string Age { get; set; }  
            public Uri Email { get; set; }  
        }  

Step 4: Code for Form1.cs:

 public partial class Form1 : Form  
    {  
        private ElementHost _elemHost = new ElementHost();  
        private WPFControls _WPFDataGrid = new WPFControls();   
        public Form1()  
        {  
            InitializeComponent();  
            _elemHost.Location = new Point(10, 10);  
            _elemHost.Child = _WPFDataGrid;   
            _elemHost.Width = 400;  
            _elemHost.Height = 300;  
            this.Controls.Add(_elemHost);    
        }  
  
    }  

Step 5: Run and get the result picture:

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