设置控件的相对布局位置不变

在背景图上写控件时，控制所写控件的相对布局不变，WPF 控件的相对布局

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;

namespace WpfApp1
{
    /// 

    /// App.xaml 的交互逻辑
    /// 

    public partial class App : Application
    {
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

    ..A..H.     66560  2019-07-24 17:58  WpfApp1\.vs\WpfApp1\v16\.suo

     文件     253952  2019-07-22 15:24  WpfApp1\.vs\WpfApp1\v16\Browse.VC.db

     文件          0  2019-07-22 12:21  WpfApp1\.vs\WpfApp1\v16\Server\sqlite3\db.lock

     文件     716800  2019-07-24 17:58  WpfApp1\.vs\WpfApp1\v16\Server\sqlite3\storage.ide

     文件        189  2019-07-22 12:20  WpfApp1\WpfApp1\App.config

     文件        365  2019-07-24 17:35  WpfApp1\WpfApp1\App.xaml

     文件        334  2019-07-22 12:20  WpfApp1\WpfApp1\App.xaml.cs

     文件       1470  2019-07-24 17:34  WpfApp1\WpfApp1\bg.png

     文件      12800  2019-07-24 17:58  WpfApp1\WpfApp1\bin\Debug\WpfApp1.exe

     文件        189  2019-07-22 12:20  WpfApp1\WpfApp1\bin\Debug\WpfApp1.exe.config

     文件      38400  2019-07-24 17:58  WpfApp1\WpfApp1\bin\Debug\WpfApp1.pdb

     文件       2346  2019-07-24 17:58  WpfApp1\WpfApp1\obj\Debug\App.g.cs

     文件       2346  2019-07-24 17:58  WpfApp1\WpfApp1\obj\Debug\App.g.i.cs

     文件        664  2019-07-23 18:59  WpfApp1\WpfApp1\obj\Debug\DesignTimeResolveAssemblyReferences.cache

     文件       7243  2019-07-24 17:57  WpfApp1\WpfApp1\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache

     文件       3015  2019-07-24 17:57  WpfApp1\WpfApp1\obj\Debug\GeneratedInternalTypeHelper.g.i.cs

     文件       5229  2019-07-24 17:57  WpfApp1\WpfApp1\obj\Debug\MainWindow.g.i.cs

     文件       4429  2019-07-24 17:57  WpfApp1\WpfApp1\obj\Debug\MarqueeControl.g.i.cs

     文件       3584  2019-07-22 12:21  WpfApp1\WpfApp1\obj\Debug\TempPE\Properties.Resources.Designer.cs.dll

     文件       3981  2019-07-24 17:57  WpfApp1\WpfApp1\obj\Debug\UserControl1.g.i.cs

     文件       3041  2019-07-24 17:57  WpfApp1\WpfApp1\obj\Debug\Window1.g.i.cs

     文件       4418  2019-07-24 17:57  WpfApp1\WpfApp1\obj\Debug\Window2.g.i.cs

     文件       3447  2019-07-24 17:41  WpfApp1\WpfApp1\obj\Debug\Window3 - 复制.g.i.cs

     文件       1556  2019-07-24 17:58  WpfApp1\WpfApp1\obj\Debug\Window3.baml

     文件       3686  2019-07-24 17:58  WpfApp1\WpfApp1\obj\Debug\Window3.g.cs

     文件       3686  2019-07-24 17:58  WpfApp1\WpfApp1\obj\Debug\Window3.g.i.cs

     文件       1596  2019-07-24 17:58  WpfApp1\WpfApp1\obj\Debug\Window4.baml

     文件       3395  2019-07-24 17:58  WpfApp1\WpfApp1\obj\Debug\Window4.g.cs

     文件       3395  2019-07-24 17:58  WpfApp1\WpfApp1\obj\Debug\Window4.g.i.cs

     文件         42  2019-07-24 17:58  WpfApp1\WpfApp1\obj\Debug\WpfApp1.csproj.CoreCompileInputs.cache

............此处省略39个文件信息