PsimApp创建时提示错误属性“DataContext”必须位于默认的命名空间或元素命名空间“http://schemas.microsoft.com/winfx/2006/xaml/present

PsimApp创建后，加入xaml 代码

 d:DataContext="{d:DesignInstance Type=viewmodels:MainWindowViewModel}"  

编译生成时，提示错误：

属性“DataContext”必须位于默认的命名空间或元素命名空间“http://schemas.microsoft.com/winfx/2006/xaml/presentation”中。 行 7 位置 70.

解决办法

<Window 
...
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
...
/>

完整代码如下

<Window x:Class="Expert3DPipeline.Views.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:prism="http://prismlibrary.com/"
        xmlns:wv2="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf" 
        xmlns:viewmodels="clr-namespace:Expert3DPipeline.ViewModels" 
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        d:DataContext="{d:DesignInstance Type=viewmodels:MainWindowViewModel}"  
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        prism:ViewModelLocator.AutoWireViewModel="True"
        Title="{Binding Title}" Height="350" Width="525" >
    
    <Grid>
        <DockPanel LastChildFill="True">
            <Button Content="Run" Command="{Binding RunTaskCommand}" DockPanel.Dock="Bottom"/>
            <wv2:WebView2/>
        </DockPanel>
    </Grid>
</Window>