c# - 如何从配置文件加载统一设置？

Question

我有一个 unity 配置文件 (App.config) 如下:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Unity.Configuration"/>
  </configSections>
  <unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
    <alias alias="IProductService" type="UnityExample.Service.IProductService, UnityExample.Service" />
    <containers>
      <container name="Service">
        <register type="IProductService" mapTo="ProductService"/>
      </container>
    </containers>
  </unity>
</configuration>

现在我想从文件加载配置。

var container = new UnityContainer().LoadConfiguration("Service");

但我收到以下错误:

[ArgumentNullException: Value cannot be null. Parameter name: section] Microsoft.Practices.Unity.Configuration.UnityContainerExtensions.LoadConfiguration(IUnityContainer container, UnityConfigurationSection section, String containerName)

Answer 1

我能够让它发挥作用。我使用您正在使用的相同命名空间创建了一个演示控制台应用程序，如下所示:

安装的 Nuget 包:

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Unity" version="5.8.6" targetFramework="net461" />
  <package id="Unity.Abstractions" version="3.3.0" targetFramework="net461" />
  <package id="Unity.Configuration" version="5.2.3" targetFramework="net461" />
</packages>

应用程序配置:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <configSections>
        <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Unity.Configuration"/>
    </configSections>

    <unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
        <assembly name="UnityExample" />
        <namespace name="UnityExample.Service" />

        <containers>
            <container name="Service">
                <register type="IProductService" mapTo="ProductService"/>
            </container>
        </containers>
    </unity>

    <startup>
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>
    <runtime>
        <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
            <dependentAssembly>
                <assemblyIdentity name="Unity.Configuration" publicKeyToken="6d32ff45e0ccc69f" culture="neutral" />
                <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
            </dependentAssembly>
        </assemblyBinding>
    </runtime>
</configuration>

代码:

namespace UnityExample.Service
{
    public interface IProductService
    {

    }

    public class ProductService : IProductService
    {
    }
}

主要内容:

using System.Configuration;
using Microsoft.Practices.Unity.Configuration;

using Unity;
using UnityExample.Service;

namespace UnityExample
{
    class Program
    {
        static void Main(string[] args)
        {
            var container = new UnityContainer();
            UnityConfigurationSection section = (UnityConfigurationSection)ConfigurationManager.GetSection("unity");
            section.Configure(container, "Service");

            IProductService service = container.Resolve<IProductService>();
        }
    }
}