在一个“UserControl”里“xmlns:d="http://schemas.microsoft.com/expression/blend/2008"” 命名空间不能被解析，而在另一个“UserControl”里“xmlns:d="http://schemas.microsoft.com/expression/blend/2008"” 命名空间解析正常。
1、不能被解析：
<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="SLGridFramework.MainPage"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
d:DesignHeight="300"
d:DesignWidth="400">
错误信息：
错误1XAML
Namespace http://schemas.microsoft.com/expression/blend/2008 is not resolved.E:\Test\SLGridFramework\SLGridFramework\MainPage.xamlSLGridFramework
2、正常解析
<UserControl
x:Class="SLGridFramework.ALLDemo"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="400"
x:Name="ControlMainPage" >
解决方法：
在命名空间中加上，
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
