WPF应用程序中的当前上下文中不存在名称“InitializeComponent”

Question

I have checked all similar questions on StackOverflow, but none of the answers solved my problem. I simply get the error in title.

Here is my MainVindow.xaml :

<Window x:Class="CodeFirstMVVM.App.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:cm="clr-namespace:System.ComponentModel;assembly=System"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:vm="clr-namespace:CustomerOrder.App.ViewModel"
        xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
        mc:Ignorable="d"
        DataContext="{Binding Source={StaticResource Locator}, Path=CustomerView}"
        Title="MainWindow" Height="500" Width="900">
    <Grid>
        <Canvas>
            <TextBox Height="23" Canvas.Left="131" TextWrapping="Wrap"  Canvas.Top="51" Width="283" Name="txtName" Text="{Binding NameUI}"/>
            <DataGrid x:Name="maingrid" ItemsSource="{Binding Entities, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" SelectedItem="{Binding SelectedEntity}" AutoGenerateColumns="True" Canvas.Left="10" Canvas.Top="265">
                <DataGrid.Columns>
                    <DataGridTextColumn Binding="{Binding Name}" Header="Name" Width="200"></DataGridTextColumn>
                </DataGrid.Columns>
            </DataGrid>
            <DataGrid x:Name="ordergrid" ItemsSource="{Binding ElementName=maingrid, Path=SelectedItem.Orders}" AutoGenerateColumns="True" Canvas.Top="265" Canvas.Left="597">
                <DataGrid.Columns>
                    <DataGridTextColumn Binding="{Binding Explanation}" Header="Orders" Width="200"></DataGridTextColumn>
                </DataGrid.Columns>
            </DataGrid>
        </Canvas>

    </Grid>
</Window>

And here is my App.xaml :

<Application x:Class="CustomerOrder.App.App" 
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
             xmlns:d ="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc ="http://schemas.openxmlformats.org/markup-compatibility/2006"
             StartupUri="MainWindow.xaml" 
             mc:Ignorable="d">
    <Application.Resources>
        <vm:ViewModelLocator x:Key="Locator" d:IsDataSource="True" xmlns:vm="clr-namespace:CustomerOrder.App.ViewModel" />
    </Application.Resources>
</Application>

On MainWindow.xaml.cs :

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

Can you tell me how to fix this? Thanks.

Answer 1

要修复它，请更改xaml的命名空间

<Window x:Class="CustomerOrder.App.MainWindow"

Answer 2

Your MainWindow class is not in the same namespace as the xaml . Change it to

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

Answer 3

I have gotten this error a number of times when all of the above checks were done and all the namespaces matched.

What fixed it, was simply retyping the "X:Class" attribute over again. Then VS seems to correctly parse it and make the proper association.

This technique of simply retyping what ever VS is complaining about works for a number of other errors as well.

Very frustrating...

Answer 4

创建xaml文件时App.Xaml文件的类名称应为NameSpace.app，而其他Windows应具有NameSpace.WindowName。

Answer 5

I had fiddled around with excluding and re-including xaml and corresponding files.

For me closing and reopening Visual Studio worked .