我有两个项目，一个资源库，它包含一个xaml文件，里面只有一个名为Theme的键。在这个元素里面是Visual元素，依此类推。我的主要项目是像这样拉入xaml文件
<Window.Background>
<VisualBrush Visual={DynamicResource Theme}" />
</Window.Background
如果我手动将xaml代码放在这个区域，它的工作完美，但我希望用户能够翻阅不同的xaml“主题”。问题是，现在因为xaml文件中的visualbrush具有key属性，visual属性不会转换为visualbrush ......显然......有没有办法将visualbrush设置为xaml中visualbrush元素的dynamicresource资源库中的文件？这会产生我想要达到的效果。感谢。
修改
主窗口
<Window x:Class="OASYS_View.MainWindow"
Name="V_Window"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:ResourceLibrary;assembly=ResourceLibrary"
controls:ThemeManager.Theme="{Binding ElementName=themes, Path=SelectedItem}"
Title="V" Height="1080" Width="1920"
WindowStyle="None"
AllowsTransparency="True"
ResizeMode="NoResize">
<Window.Background>
<VisualBrush Visual="{DynamicResource Theme}" />
</Window.Background>
<Window.Triggers>
<EventTrigger RoutedEvent="Window.Loaded">
<BeginStoryboard>
<Storyboard Name="WindowFade" Completed="WindowFade_Completed">
<DoubleAnimation Name="WindowFadeAnimation"
Storyboard.TargetName="V_Window"
Storyboard.TargetProperty="(Window.Opacity)"
From="0.0" To="1.0" Duration="0:0:1"
AutoReverse="False" RepeatBehavior="1x"
/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
<EventTrigger RoutedEvent="Window.Unloaded">
<BeginStoryboard>
<Storyboard Name="WindowFadeOut" Completed="WindowFadeOut_Completed">
<DoubleAnimation Name="WindowFadeOutAnimation"
Storyboard.TargetName="V_Window"
Storyboard.TargetProperty="(Window.Opacity)"
From="1.0" To="0.0" Duration="0:0:1"
AutoReverse="False" RepeatBehavior="1x"
/>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Window.Triggers>
<Grid>
<ComboBox x:Name="themes" Width="150" Height="20" SelectionChanged="themes_SelectionChanged" SelectedIndex="0" />
<controls:ProgressIndicator x:Name="Progress" HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="0,0,0,50" Foreground="White" />
</Grid>
Themed xaml文件
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:ResourceLibrary">
<VisualBrush x:Key="Theme">
<VisualBrush.Visual>
<Viewbox Width="1920" Height="1080">
<Canvas x:Name="PART_Canvas" Width="1920" Height="1080">
<Canvas>
<Path Data="F1 M 1920.000,1079.906 L 0.000,1080.000 L 0.000,0.094 L 1920.000,0.000 L 1920.000,1079.906 Z">
<Path.Fill>
<LinearGradientBrush MappingMode="Absolute" StartPoint="959.917,-1324.218" EndPoint="959.916,-55.456">
<LinearGradientBrush.GradientStops>
<GradientStop Offset="0.00" Color="#ff5090cd"/>
<GradientStop Offset="0.66" Color="#ff5090cd"/>
<GradientStop Offset="0.76" Color="#ff5090cd"/>
<GradientStop Offset="0.95" Color="#ff287bbf"/>
<GradientStop Offset="1.00" Color="#ff0067b1"/>
</LinearGradientBrush.GradientStops>
<LinearGradientBrush.Transform>
<MatrixTransform Matrix="1.000,0.000,-0.000,-1.000,0.084,0.631" />
</LinearGradientBrush.Transform>
</LinearGradientBrush>
</Path.Fill>
</Path>
<Path Data="F1 M 1920.000,1080.789 L 0.001,1080.789 L 0.001,983.908 L 1920.000,983.908 L 1920.000,1080.789 Z">
<Path.Fill>
<LinearGradientBrush MappingMode="Absolute" StartPoint="959.917,-1102.122" EndPoint="959.917,-988.308">
<LinearGradientBrush.GradientStops>
<GradientStop Offset="0.00" Color="#ff5090cd"/>
<GradientStop Offset="0.87" Color="#ff5090cd"/>
<GradientStop Offset="1.00" Color="#ff5090cd"/>
</LinearGradientBrush.GradientStops>
<LinearGradientBrush.Transform>
<MatrixTransform Matrix="1.000,0.000,-0.000,-1.000,0.084,0.631" />
</LinearGradientBrush.Transform>
</LinearGradientBrush>
</Path.Fill>
</Path>
<Canvas>
<Path Fill="#ff0067b1" Data="F1 M 51.500,1042.869 C 51.500,1038.111 50.352,1034.229 48.053,1031.217 C 45.751,1028.203 42.730,1026.695 38.986,1026.695 C 35.227,1026.695 32.205,1028.203 29.921,1031.217 C 27.640,1034.229 26.498,1038.111 26.498,1042.869 C 26.498,1047.592 27.631,1051.420 29.899,1054.344 C 32.166,1057.268 35.195,1058.732 38.986,1058.732 C 42.764,1058.732 45.794,1057.268 48.075,1054.344 C 50.359,1051.420 51.500,1047.592 51.500,1042.869 Z M 56.825,1042.869 C 56.825,1047.979 55.179,1052.160 51.887,1055.408 C 48.595,1058.654 44.296,1060.277 38.986,1060.277 C 33.678,1060.277 29.382,1058.654 26.097,1055.408 C 22.813,1052.160 21.174,1047.979 21.174,1042.869 C 21.174,1037.744 22.824,1033.510 26.135,1030.166 C 29.441,1026.818 33.727,1025.148 38.986,1025.148 C 44.263,1025.148 48.556,1026.818 51.863,1030.166 C 55.172,1033.510 56.825,1037.744 56.825,1042.869 Z"/>
<Canvas>
<Path StrokeThickness="0.5" Stroke="#ff0067b1" StrokeMiterLimit="1.0" Data="F1 M 21.224,1018.291 L 290.490,1018.291"/>
<Path Data="F1 M 135.245,1003.188 L 135.060,1009.395 L 137.035,1009.199 L 135.245,1003.188 Z M 130.846,1012.207 L 124.915,1008.137 L 129.871,1013.525 L 130.846,1012.207 Z M 137.423,1010.262 C 133.455,1010.262 130.202,1013.304 129.860,1017.178 L 144.985,1017.178 C 144.644,1013.304 141.391,1010.262 137.423,1010.262 Z M 133.857,1009.986 L 127.557,1002.258 L 132.096,1011.004 L 133.857,1009.986 Z M 145.892,1016.332 L 151.180,1014.025 L 145.482,1014.719 L 145.892,1016.332 Z M 142.287,999.391 L 138.402,1009.178 L 140.571,1009.801 L 142.287,999.391 Z M 128.842,1016.477 L 129.334,1014.762 L 118.275,1012.311 L 128.842,1016.477 Z M 143.382,1011.316 L 146.301,1004.479 L 141.899,1010.357 L 143.382,1011.316 Z M 144.091,1012.125 L 145.122,1013.596 L 151.921,1005.924 L 144.091,1012.125 Z">
<Path.Fill>
<RadialGradientBrush MappingMode="Absolute" GradientOrigin="706.543,618.713" Center="706.543,618.713" RadiusX="5.469" RadiusY="5.469">
<RadialGradientBrush.GradientStops>
<GradientStop Offset="0.00" Color="#ffffffff"/>
<GradientStop Offset="0.43" Color="#ffcccccc"/>
<GradientStop Offset="1.00" Color="#ff999999"/>
</RadialGradientBrush.GradientStops>
<RadialGradientBrush.Transform>
<MatrixTransform Matrix="1.238,0.000,0.000,1.237,-737.613,251.618" />
</RadialGradientBrush.Transform>
</RadialGradientBrush>
</Path.Fill>
</Path>
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<Path StrokeThickness="0.5" Stroke="#ff0067b1" StrokeMiterLimit="1.0" Data="F1 M 21.224,1066.850 L 290.490,1066.850"/>
<Canvas>
<Path Opacity="0.5" Fill="#ff4b4d4d" Data="F1 M 199.003,1053.682 L 199.088,1053.682 L 208.492,1026.553 L 210.516,1026.553 L 198.961,1059.369 L 187.532,1026.553 L 189.557,1026.553 L 199.003,1053.682 Z"/>
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</Canvas>
</Canvas>
</Canvas>
</Canvas>
</Canvas>
</Viewbox>
</VisualBrush.Visual>
</VisualBrush>
</ResourceDictionary>
你会看到VisualBrush有键名，但在mainwindow.background中我需要绑定到visualbrush的visual属性。
{“无法将类型为'System.Windows.Media.VisualBrush'的对象强制转换为'System.Windows.Media.Visual'。”}
答案 0 :(得分：1)
修改
试试这个
<Window Background="{DynamicResource Theme}"
...>
答案 1 :(得分：0)
尝试将资源字典文件添加到Window的资源中，然后指向后台的视觉效果。
<Window>
<Window.Resources>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Theme.xaml"/>
</ResourceDictionary.MergedDictionaries>
</Window.Resources>
<Window.Background>
<VisualBrush Visual="{VisualKey}"/>
</Window.Background>
</Window>