WPF的.NET Core 3.0中的依赖项注入 [英] Dependency Injection in .NET Core 3.0 for WPF

问题描述

我对ASP.NET Core和对依赖项注入的支持非常熟悉.控制器可以通过在其构造函数中添加参数来要求依赖关系.如何在WPF UserControls中实现依赖关系?我尝试向构造函数添加参数，但这没用.我喜欢IOC的概念，希望将其推广到WPF.

I’m quite familiar with ASP.NET Core and the support for dependency injection out of the box. Controllers can require dependencies by adding a parameter in their constructor. How can dependencies be achieved in WPF UserControls? I tried adding a parameter to the constructor, but that didn’t work. I love the IOC concept and would prefer to bring this forward to WPF.

推荐答案

我最近在我的项目中遇到了这一要求，并以此方式解决了该问题.

I have recently come across this requirement to my project and I solved it this way.

用于WPF的.NET Core 3.0中的依赖项注入.在解决方案中创建WPF Core 3项目后，需要安装/添加NuGet软件包:

For Dependency Injection in .NET Core 3.0 for WPF. After you create a WPF Core 3 project in your solution, you need to install/add NuGet packages:

Microsoft.Extensions.DependencyInjection

在我的情况下，我创建了一个称为LogBase的类，我想将其用于日志记录，因此在您的App类中添加以下内容(是的，这只是一个基本示例):

In my case, I created a class called LogBase that I want to use for logging, so in your App class, add the following (and ya this is just a basic example):

private readonly ServiceProvider _serviceProvider;

public App()
{
    var serviceCollection = new ServiceCollection();
    ConfigureServices(serviceCollection);
    _serviceProvider = serviceCollection.BuildServiceProvider();
}
    
private void ConfigureServices(IServiceCollection services)
{
    services.AddSingleton<ILogBase>(new LogBase(new FileInfo($@"C:\temp\log.txt")));
    services.AddSingleton<MainWindow>();
}
    
private void OnStartup(object sender, StartupEventArgs e)
{
    var mainWindow = _serviceProvider.GetService<MainWindow>();
    mainWindow.Show();
}

在您的App.xaml中，添加Startup ="OnStartup"所以看起来像这样:

In your App.xaml, add Startup="OnStartup" so it looks like this:

<Application x:Class="VaultDataStore.Wpf.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:VaultDataStore.Wpf"
             Startup="OnStartup">
    <Application.Resources>
        
    </Application.Resources>
</Application>

因此，在MainWindow.xaml.cs中，您将ILogBase注入到构造函数中，如下所示:

So in your MainWindow.xaml.cs, you inject ILogBase in the constructor like this:

private readonly ILogBase _log;

public MainWindow(ILogBase log)
{
    _log = log;

    ...etc.. you can use _log over all in this class

在LogBase类中，我以自己喜欢的方式使用任何记录器.

In my LogBase class, I use any logger I like in my way.

我在此GitHub存储库中将所有这些内容加在一起.

I have added all this together in this GitHub repo.

同时，有人问我如何在用户控件中使用注入.如果有人从中受益，我想出了一种解决方案.在此处进行检查.

Meanwhile, I have been asked how to use injection inside user control. I come up with this solution if some one get the benefit of it. Check it here.

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