在我的项目中，我有：

Form1.cs

using System;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        Form2 Form2 = new Form2();

        public Form1()
        {
            InitializeComponent();
            Form2.Show();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            var random = new Random();
            string number = random.Next(-10,10).ToString();
            textBox1.Text = number;
            Form2.InsertText(number);
        }
    }
}

字符串

Form2.cs

using System.Windows.Forms;
using System.Windows.Forms.Integration;

namespace WindowsFormsApp1
{
    public partial class Form2 : Form
    {
        UserControlWPFVM UserControlWPFVM = new UserControlWPFVM();
        ElementHost host = new ElementHost();
        public Form2()
        {
            InitializeComponent();

            UserControlWPF userControlWPF=new UserControlWPF();
            host.Dock = DockStyle.Fill;
            host.Child = userControlWPF;
            this.Controls.Add(host);
        }
        public void InsertText(string text)
        {
            UserControlWPFVM.InsertText(text);
            host.Update();
        }
    }
}

型

UserControlWPF.xaml

<UserControl x:Class="WindowsFormsApp1.UserControlWPF"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:WindowsFormsApp1"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <Grid>
        <TextBox Text="{Binding Text1,UpdateSourceTrigger=PropertyChanged}" />
    </Grid>
</UserControl>

型

UserControlWPF.xaml.cs

using System.Windows.Controls;

namespace WindowsFormsApp1
{
    public partial class UserControlWPF : UserControl
    {
        public UserControlWPFVM UserControlWPFVM { get; set; }
        public UserControlWPF()
        {
            UserControlWPFVM = new UserControlWPFVM();
            InitializeComponent();
            DataContext = UserControlWPFVM;
        }
    }
}

型

UserControlWPFVM.cs

using Prism.Mvvm;

namespace WindowsFormsApp1
{
    public class UserControlWPFVM : BindableBase
    {
        
        private string text1 = "333";
        public string Text1
        {
            get { return text1; }
            set { SetProperty(ref text1, value); }
        }

        public void InsertText(string text)
        {
            Text1 = text;
        }
    }
}

型
按下Form1中的按钮后，将生成随机数，并应插入UserControl（WPF）中的TextBox中。UserControlWPFVM.cs中的属性Text1已更新，但我看不到UserControl中TextBox的任何更改。