解决方法
只需简单地做出如下约束：
<Window x:Class="YourApplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="YourApplication"
Height="{Binding SystemParameters.PrimaryScreenHeight}"
Width="{Binding SystemParameters.PrimaryScreenWidth}">
