变量在创建后不直接存在于当前上下文中

Question

我有以下课程：

/// <summary>
///     Represents an implementation of the <see cref="IAspNetCoreLoggingConfigurationBuilder"/> to configure the ASP.NET Core Logging.
/// </summary>
public class AspNetCoreLoggingConfigurationBuilder : IAspNetCoreLoggingConfigurationBuilder
{
    #region Properties

    /// <summary>
    ///     Gets the <see cref="ILogSource"/> that's used to write log entries.
    /// </summary>
    public ILogSource LogSource{ get; private set; }

    #endregion

    #region IAspNetCoreLoggingConfigurationBuilder Members

    /// <summary>
    ///     Sets the log source that should be used to save log entries.
    /// </summary>
    /// <param name="logSource">The source </param>
    public void SetLogSource(ILogSource logSource)
    {
        LogSource = logSource;
    }

    #endregion
}

我还有一个创建此类实例的方法：

/// <summary>
///     Adds logging to the <see cref="IApplicationBuilder"/> request execution pipeline.
/// </summary>
/// <param name="app">The <see cref="IApplicationBuilder"/> to configure the application's request pipeline.</param>
/// <param name="configuration">Builder used to configure the ASP.NET Core Logging.</param>
/// <returns>A reference to this instance after the operation has completed.</returns>
public static IApplicationBuilder UseAspNetCoreLogging(this IApplicationBuilder app, Action<IAspNetCoreLoggingConfigurationBuilder> configuration)
{
    var aspNetLoggerConfiguration = new AspNetCoreLoggingConfigurationBuilder();

    configuration(aspNetLoggerConfiguration);

    // Add the registered ILogSource into the registered services.
    _services.AddInstance(typeof (ILogSource), aspNetLoggerConfiguration.LogSource);

    // The entire configuration for the middleware has been done, so return the middleware.
    return app.UseMiddleware<AspNetCoreLoggingMiddleware>();
}

注意这里的第一行，我正在创建一个类的实例。 但是，当我在手表中检查此变量时，当我的光标位于 configuration(aspNetLoggerConfiguration); 行时，我确实知道该变量在当前上下文中不存在。

直接在监视窗口中创建变量的实例确实有效。

有人知道吗？

附：这是我在 xUnit 中测试的 DNX 项目。代码正在“调试”模式下运行。

Answer 1

没有运行时也没有编译错误。 这是 Visual Studio 无法在调试窗口中显示对象的问题，因为它是运行时对象（类似的东西）。

此问题的另一个发生是在 wcf-service 客户端中。创建一个新的服务客户端Client 并尝试在监视窗口中显示client.InnerChannel。它行不通。但是，您可以创建一个临时对象（布尔、字符串等）并将所需的值写入其中以查看您的值。

#if DEBUG
    var tmpLog = aspNetLoggerConfiguration.LogSource;
#endif

当您的鼠标悬停在 tmpLog 上时，您应该会在 LogSource 中看到它。