相关疑难解决方法(0)

这个XAMLParseException让我疯狂!我在Visual Studio 1020中使用.NET 3.5这是我的xaml:

<Window x:Class="WinformsHost.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Advanced Notepad" Height="350" Width="525" Loaded="Window_Loaded">
<DockPanel>
    <Menu DockPanel.Dock="Top">

        <MenuItem Header="File">
            <MenuItem Header="_New" />
            <MenuItem Header="_Open..." />
            <MenuItem Header="_Save" />
            <MenuItem Header="S_ave As..." />
            <Separator />
            <MenuItem Header="Page Setup" />
            <MenuItem Header="Print" />
            <Separator />
            <MenuItem Header="Exit" />
        </MenuItem>

        <MenuItem Header="Edit">
            <MenuItem Header="Undo" />
            <MenuItem Header="Redo" />
            <Separator />
            <MenuItem Header="Cut" />
            <MenuItem Header="Copy" />
            <MenuItem Header="Paste" />
            <MenuItem Header="Delete"  />
            <Separator />
            <MenuItem Header="Time/Date" />
            <Separator />
            <MenuItem Header="Preferences" />
        </MenuItem>

        <MenuItem …