模拟 IConfigurationSection 以返回字符串数组

Question

使用 this 答案模拟来自 ASP.NET Core 应用程序的 IConfiguration 方法。

我需要模拟一个IConfigurationSection 来返回一个string 数组。

我的配置类如下所示：

public class LoggingConfiguration
{
    public string ApplicationName { get; set; }
    public string[] Loggers { get; set; }
}

appsettings.json

{
    "Logging": {
        "LoggingConfiguration": {
              "ApplicationName": "Some app",
              "Loggers":  [ "DiskLogger", "MemoryLogger"],
              "DiskLogger": {
                  "SomeSettingOne" : "setting",
                  "SomeSettingTwo" : "setting",
               },
              "MemoryLogger": {
                  "AnotherSetting": "...",
               }
       }

在设置模拟时 - 我有两个问题。

1. 我不知道如何模拟将返回 string[] 的 IConfigurationSection (loggers)
2. 当我尝试在 LoggingSectionMock 上设置 GetChildren() 方法时遇到异常

public void Setup()
{
    var applicationNameConfigurationSectionMock = new Mock<IConfigurationSection>();
    applicationNameConfigurationSectionMock.Setup(m => m.Value).Returns(TestingApplicationName);

    var loggerNamesConfigurationSectionMock = new Mock<IConfigurationSection>();
    loggerNamesConfigurationSectionMock.Setup(m => m.GetChildren()).Returns(GetLoggerNamesSection);

    //Throwing Method Not Found exception
    LoggingSectionMock.Setup(m => m.GetChildren()).Returns(new List<IConfigurationSection>
        {applicationNameConfigurationSectionMock.Object, loggerNamesConfigurationSectionMock.Object});

    ConfigurationMock.Setup(m => m.GetSection($"{Logging}:{LoggingConfiguration}"))
        .Returns(() => LoggingSectionMock.Object);
}

private IEnumerable<IConfigurationSection> GetLoggerNamesSection()
{
    var loggerNamesConfigurationSections = new List<IConfigurationSection>();
    LoggerNames.ToList().ForEach(loggerName =>
    {
        var configSectionMock = new Mock<IConfigurationSection>();
        configSectionMock.Setup(m => m.Value).Returns(loggerName);
        loggerNamesConfigurationSections.Add(configSectionMock.Object);
    });
    return loggerNamesConfigurationSections;
}

Answer 1

作为替代方案，您可以利用ConfigurationBuilder 的AddInMemoryCollection：

参考Memory configuration provider

设置

IConfiguration configRoot = new ConfigurationBuilder()
    .AddInMemoryCollection(new Dictionary<string, string>
    {
        { "ApplicationName", "App" }, 
        { "Loggers:0", "1" },
        { "Loggers:1", "2" },
        { "Loggers:2", "3" }
    })
    .Build();

用法

LoggingConfiguration config = configRoot.Get<LoggingConfiguration>();