在Wpf窗口中使用创建的DLL

我有一个DLL，代码为

using System.Text;
using Microsoft.Win32;
using System.Diagnostics;
using System.Runtime.InteropServices;
namespace ApplicationCheck
{
    public  class ApCkr
    {
        #region .NET
        public string Netframeworkavailable()
        {
            bool NETinstall;
            RegistryKey k1 = Registry.LocalMachine.OpenSubKey("SOFTWARE''Microsoft''NET Framework Setup''NDP''v4''Client");
            if (k1 == null)
            {
                NETinstall = false;
            }
            else
            {
                NETinstall = true;
            }
            return NETinstall.ToString();
        }

        #endregion
        #region PDF
        public string PDFavailable()
        {
            bool PDFinstall;
            RegistryKey k2 = Registry.ClassesRoot.OpenSubKey(".pdf");
            if (k2 == null)
            {
                PDFinstall = false;
            }
            else
            {
                PDFinstall = true;
            }
            return PDFinstall.ToString(); 
        }
        #endregion

        #region IExplore
        public string IEavailable()
        {
            bool IEversion;
            string  k3 = Registry.LocalMachine.OpenSubKey("SOFTWARE''Microsoft''Internet Explorer").GetValue("Version").ToString();
            string z = k3.Substring(0, 1);
            int a = Int32.Parse(z);
             if (a < 8)
            {
                IEversion = false;
            }
            else
            {
                IEversion = true;
            }
            return IEversion.ToString();
        }
        #endregion

        #region IIS
        public string IISavailable()
        {
            bool IISinstall;
            RegistryKey k4 = Registry.LocalMachine.OpenSubKey("SOFTWARE''Microsoft''InetStp");
            if (k4 == null)
            {
                IISinstall = false;
            }
            else
            {
                IISinstall = true;
            }
            return IISinstall.ToString();
        }

        #endregion
    }
}

以及带有以下XAML代码的WPF窗口

<Window x:Class="WpfApplication1.Window2"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        ResizeMode="CanResizeWithGrip"
        WindowStyle="None" Background="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"
        Title="Window2" Height="350" Width="525">
    <Grid>
        <Label Content="Windows" Height="25" HorizontalAlignment="Left" Margin="12,15,0,0" Name="label1" VerticalAlignment="Top" Width="106" />
        <Label Content="Edition " Height="25" HorizontalAlignment="Left" Margin="12,45,0,0" Name="label2" VerticalAlignment="Top" Width="106" />
        <Label Content="Service Pack " Height="25" HorizontalAlignment="Left" Margin="12,75,0,0" Name="label3" VerticalAlignment="Top" Width="106" />
        <Label Content="Version " Height="25" HorizontalAlignment="Left" Margin="12,105,0,0" Name="label4" VerticalAlignment="Top" Width="106" />
        <Label Content="Processor Bits " Height="25" HorizontalAlignment="Left" Margin="12,135,0,0" Name="label5" VerticalAlignment="Top" Width="106" />
        <Label Content="OS Bits " Height="25" HorizontalAlignment="Left" Margin="12,165,0,0" Name="label6" VerticalAlignment="Top" Width="106" />
        <Label Content="Program Bits " Height="25" HorizontalAlignment="Left" Margin="12,195,0,0" Name="label7" VerticalAlignment="Top" Width="106" />
        <TextBlock Height="21" HorizontalAlignment="Left" Margin="114,19,0,0" Name="textBlock1"   Text="{Binding Path=var}" VerticalAlignment="Top" Width="249" ContextMenuOpening="textBlock1_ContextMenuOpening" />
    </Grid>
</Window>

以及WPF的c#代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for Window2.xaml
    /// </summary>
    public partial class Window2 : Window
    {
        public Window2()
        {
            InitializeComponent();
        }
        private void textBlock1_ContextMenuOpening(object sender, ContextMenuEventArgs e)
        {
            var NET = new ApplicationCheck.ApCkr();
            textBlock1.Text = NET.Netframeworkavailable();
            this.DataContext = textBlock1;
        }

    }
}

我研究了MSDN中的数据绑定和At堆栈溢出，即WPF GUI和几个ListBox/CheckBox 之间的DataBinding

和其他人，但我做不好。尽管堆栈溢出帮助我在控制台应用程序中利用了这一点。现在我必须在WPF窗口中执行此操作。

编辑：我必须显示DLL 的返回值

public class ApCkrVm {
    public string netFrameworkAvailable {
        get { return ApCkr.NetFrameworkAvailable(); }
    }
    public string pdfAvailable {
        get { return ApCkr.PDFAvailable(); }
    }
    ...
}

public Window2( ) {
    this.DataContext = new ApCkrVm( );
    InitializeComponent( );
}

<TextBlock Text="{Binding Path=netFrameworkAvailable}" ... />

<Window x:Class="TestWpfApplication.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="220" Width="343"
        xmlns:my="clr-namespace:TestWpfControlLibrary;assembly=TestWpfControlLibrary" Left="Auto" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" WindowStyle="None">

xmlns:my="clr-namespace:TestWpfControlLibrary;assembly=TestWpfControlLibrary"`

<my:UserControl1 Height="168" HorizontalAlignment="Left" Margin="10,22,0,0"  VerticalAlignment="Top" Width="307" Name="login" />

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            login.Visibility = System.Windows.Visibility.Visible;
        }
    }