根級別的數據無效。 1號線，位置1. XML是無效

Question

我有我的代碼中的兩個錯誤：

在根級別

• 數據是無效的。第1行，位置1.
• 標記文件無效。指定一個擴展名爲.xaml的源標記文件。

爲什麼？

MainWindow.xaml：

<Window x:Class="TestWpfApplication.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Eight Ball Answer" Height="328" Width="412" > 
    <Grid Name="grid1"> 
     <Grid.RowDefinitions> 
      <RowDefinition Height="*" /> 
      <RowDefinition Height="Auto" /> 
      <RowDefinition Height="*" /> 
     </Grid.RowDefinitions> 
     <TextBox VerticalAlignment="Stretch" HorizontalAlignment="Stretch"  Margin="10,10,13,10" Name="txtQuestion"  TextWrapping="Wrap" FontFamily="Verdana" FontSize="24"  Grid.Row="0">[Place question here.]</TextBox> 
     <Button VerticalAlignment="Top" HorizontalAlignment="Left"  Margin="10,0,0,20" Width="127" Height="23" Name="cmdAnswer"  Click="cmdAnswer_Click" Grid.Row="1">Ask the Eight Ball</Button> 
     <TextBox VerticalAlignment="Stretch" HorizontalAlignment="Stretch"  Margin="10,10,13,10" Name="txtAnswer" TextWrapping="Wrap"  IsReadOnly="True" FontFamily="Verdana" FontSize="24" Foreground="Green"  Grid.Row="2">[Answer will appear here.]</TextBox> 
     <Grid.Background> 
      <LinearGradientBrush> 
       <LinearGradientBrush.GradientStops> 
        <GradientStop Offset="0.00" Color="Red" /> 
        <GradientStop Offset="0.50" Color="Indigo" /> 
        <GradientStop Offset="1.00" Color="Violet" /> 
       </LinearGradientBrush.GradientStops> 
      </LinearGradientBrush> 
     </Grid.Background> 
    </Grid> 
</Window> 

MainWindow.xaml.cs：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Data; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Imaging; 
using System.Windows.Navigation; 
using System.Windows.Shapes; 

namespace TestWpfApplication 
{ 
    /// <summary> 
    /// Interaction logic for MainWindow.xaml 
    /// </summary> 
    public partial class MainWindow : Window 
    { 
     public MainWindow() 
     { 
      InitializeComponent(); 
     } 

     private void cmdAnswer_Click(object sender, RoutedEventArgs e) 
     { 
      this.Cursor = Cursors.Wait;    

      txtAnswer.Text = "AAA"; 
      this.Cursor = null; 
     } 
    } 
} 

更新1：

1. 本頁面被複制粘貼&方法創建，而不是由設計師。
2. MainWindow.xaml將PropertyAction屬性設置爲Page。

是否有幫助？

Answer 1

更新：修復方法是創建一個新項目並複製自己的東西。

您的.xaml似乎是有效的，你確定錯誤是指MainWindow.xaml？