Xamarin表单级联样式表(CSS)不工作。加载样式文件失败

我使用的是Xamarin形式的层叠样式表(CSS)。我已经在PCL项目中添加了层叠样式表(CSS)文件,我正在尝试调用CSS,因为它没有加载,所以出现了异常。即使是我也给予了充分的许可,并遵循同样的步骤 link

我已经为这个css文件设置了构建操作- 嵌入式资源

----代码-----

CSS格式

body {
    background-color: white;
}

.frameStyle {
    background-color: rgb(50,50,255);
}

使用XAML。

      <ContentPage.Resources>
        <StyleSheet Source="Assets/styles.css" />
    </ContentPage.Resources>

我得到的异常加载CSS文件如下。

Resource: 'Views/DashBoard/Assets/styles.css' not found.
Stack Exception:
  at Xamarin.Forms.Xaml.CreateValuesVisitor.Visit (Xamarin.Forms.Xaml.ElementNode node, Xamarin.Forms.Xaml.INode parentNode) [0x0024e] in D:\a\1\s\Xamarin.Forms.Xaml\CreateValuesVisitor.cs:94 
  at Xamarin.Forms.Xaml.ElementNode.Accept (Xamarin.Forms.Xaml.IXamlNodeVisitor visitor, Xamarin.Forms.Xaml.INode parentNode) [0x000ac] in D:\a\1\s\Xamarin.Forms.Xaml\XamlNode.cs:149 
  at Xamarin.Forms.Xaml.ElementNode.Accept (Xamarin.Forms.Xaml.IXamlNodeVisitor visitor, Xamarin.Forms.Xaml.INode parentNode) [0x00044] in D:\a\1\s\Xamarin.Forms.Xaml\XamlNode.cs:143 
  at Xamarin.Forms.Xaml.RootNode.Accept (Xamarin.Forms.Xaml.IXamlNodeVisitor visitor, Xamarin.Forms.Xaml.INode parentNode) [0x00079] in D:\a\1\s\Xamarin.Forms.Xaml\XamlNode.cs:202 
  at Xamarin.Forms.Xaml.XamlLoader.Visit (Xamarin.Forms.Xaml.RootNode rootnode, Xamarin.Forms.Xaml.HydrationContext visitorContext) [0x00054] in D:\a\1\s\Xamarin.Forms.Xaml\XamlLoader.cs:140 
  at Xamarin.Forms.Xaml.XamlLoader.Load (System.Object view, System.String xaml) [0x00058] in D:\a\1\s\Xamarin.Forms.Xaml\XamlLoader.cs:89 
  at Xamarin.Forms.Xaml.XamlLoader.Load (System.Object view, System.Type callingType) [0x00026] in D:\a\1\s\Xamarin.Forms.Xaml\XamlLoader.cs:67 
  at Xamarin.Forms.Xaml.Extensions.LoadFromXaml[TXaml] (TXaml view, System.Type callingType) [0x00000]

请告诉我我犯了什么错谢谢。