I know this was answered due to a different cause, but this is a highly hit posting and I had ran into the same issue with a class library. In this case, it turned out to be both a change in my namespace (answered in this post here) and that the compiler could not rebuild the Window.g.i.cs which defines the InitializeComponent() method. It couldn't because the class library was missing the ProjectTypeGuid value for WPF projects in the csproj file. Instructions for this are here and here. I thought I would share in case someone else has run into the same issue. Just changing the namespace isn't enough in this case.

我遇到过这种情况(尽管这在很大程度上是我的错，是在我复制并粘贴了一些代码之后造成的);当命名空间在XAML和后面的代码之间不匹配时，就会发生这种情况

EG

<UserControl x:Class="DockPanel.TreeView" />

后面的代码是

namespace NotDockPanel

I know this was answered due to a different cause, but this is a highly hit posting and I had ran into the same issue with a class library. In this case, it turned out to be both a change in my namespace (answered in this post here) and that the compiler could not rebuild the Window.g.i.cs which defines the InitializeComponent() method. It couldn't because the class library was missing the ProjectTypeGuid value for WPF projects in the csproj file. Instructions for this are here and here. I thought I would share in case someone else has run into the same issue. Just changing the namespace isn't enough in this case.

给那些在网上找到这个的人。检查窗户。Csproj文件，如果那里有编译。应该有2项

<Page Include="YourFile.xaml">
  <SubType>Designer</SubType>
  <Generator>MSBuild:Compile</Generator>
</Page>

<Compile Include="YourFile.xaml.cs">
  <DependentUpon>YourFile.xaml</DependentUpon>
</Compile>

因为这似乎是关于缺少'InitializeComponent'的问题的去线程，我将在这里包括我的答案。

我也有这个问题，我已经尝试了我在这里和谷歌可以找到的所有其他论坛上找到的一切，但是没有人解决了我的问题。在尝试了两个小时之后，我终于发现我的设置出了什么问题。

在我们的项目中，我们使用了来自MahApps的Metro组件。给我带来麻烦的视图是从MetroWindow继承的视图，像这样:

<Controls:MetroWindow x:Class="ProjectNamespace.MyView"
                      xmlns:Controls="http://metro.mahapps.com/winfx/xaml/controls"
                      ... >

现在，我将静态资源定义为

<Controls:MetroWindow.Resources>
    <prop:Resources x:Key="LocalizedStrings"/>
    ...
</Controls:MetroWindow.Resources>

这就是我在所有其他视图中的UserControls中定义资源的方式，所以我认为这是可行的。

然而，《Controls:MetroWindow!》在那里，我绝对需要如下的资源定义:

<Controls:MetroWindow.Resources>
    <ResourceDictionary>
        <prop:Resources x:Key="LocalizedStrings"/>
        ...
    </ResourceDictionary>
</Controls:MetroWindow.Resources>

总之，我的问题是缺少<ResourceDictionary>标记。我真的不知道为什么这会产生'InitializeComponent'错误，奇怪的是，它甚至没有在我的每台机器上产生它，但这就是我如何修复它。希望这对(剩下的0.001%遇到这个问题的人)有所帮助。

卸载整个解决方案，然后重新加载。然后重新构建解决方案。这为我解决了问题。