Fluent ConfigurationSourceBuilder 导致 InvalidOperationException

Question

我正在构建一个日志 DLL，它将简化 EntLib 5 日志应用程序块。我正在使用ConfigurationSourceBuilder 为我的应用程序配置日志记录。我目前有这个：

var configBuilder = new ConfigurationSourceBuilder();

        configBuilder.ConfigureLogging().WithOptions
            .DoNotRevertImpersonation()
            .LogToCategoryNamed("EventLog")
                .WithOptions.SetAsDefaultCategory()
                .SendTo.EventLog("Event Log Listener")
                .FormatWithSharedFormatter("Text Formatter")
                .ToLog("Application")
            .LogToCategoryNamed("Email")
                .SendTo.Email("Email Trace Listener")
                .To(ToEmail)
                .From(fromEmail)
                .WithSubjectStart("Error:")
                .UsingSmtpServer(SmtpServer)
                .UsingSmtpServerPort(SmtpServerPort)
                .Unauthenticated()
                .FormatWithSharedFormatter("Text Formatter")
            .LogToCategoryNamed("LogFile")
                .SendTo.FlatFile("Flat File Trace Listener")
                .ToFile(logFileName)
                .WithHeader("------------------------------")
                .WithFooter("------------------------------")
                .FormatWithSharedFormatter("Text Formatter");

        var configSource = new DictionaryConfigurationSource();
        configBuilder.UpdateConfigurationWithReplace(configSource);
        EnterpriseLibraryContainer.Current = 
            EnterpriseLibraryContainer.CreateDefaultContainer(configSource);

程序将构建，我将在主应用程序中引用它。当它开始设置配置时，会出现以下错误：

InvalidOperationException - The current type,
Microsoft.Practices.EnterpriseLibrary.Logging.Formatters.ILogFormatter, 
is an interface and cannot be constructed. Are you missing a type mapping?

以防万一，主应用程序使用 Unity 作为 IoC。我需要用 Unity 解析 DLL 吗？

Answer 1

在我看来，问题在于您实际上还没有创建格式化程序。您已使用语句 .FormatWithSharedFormatter("Text Formatter") 按名称引用现有格式化程序。

如果您使用FormatterBuilder 定义格式化程序，那么应该没问题：

var configBuilder = new ConfigurationSourceBuilder();

configBuilder.ConfigureLogging().WithOptions
.DoNotRevertImpersonation()
.LogToCategoryNamed("EventLog")
    .WithOptions.SetAsDefaultCategory()
    .SendTo.EventLog("Event Log Listener")
    .FormatWith(
        new FormatterBuilder()
            .TextFormatterNamed("Text Formatter")
            .UsingTemplate("Timestamp: {timestamp}{newline}Message: {message}{newline}Category: {category}")
        )
    .ToLog("Application")
.LogToCategoryNamed("Email")
    .SendTo.Email("Email Trace Listener")
    .To(ToEmail)
    .From(fromEmail)
    .WithSubjectStart("Error:")
    .UsingSmtpServer(SmtpServer)
    .UsingSmtpServerPort(SmtpServerPort)
    .Unauthenticated()
    .FormatWithSharedFormatter("Text Formatter")
.LogToCategoryNamed("LogFile")
    .SendTo.FlatFile("Flat File Trace Listener")
    .ToFile(logFileName)
    .WithHeader("------------------------------")
    .WithFooter("------------------------------")
    .FormatWithSharedFormatter("Text Formatter");