NLog 为多个目标定义多个具有不同日志级别的相同最终规则

Question

我正在尝试使用多个 final 规则将带有 NLog 的消息记录到多个目标。

情况

NLog 版本：4.7.5
平台：.NET CORE 3.1
配置：XML File 和 configured programmatically

我有 2 个目标 File 和 Console

LogManager.Configuration.AddTarget(fileTarget);
LogManager.Configuration.AddTarget(consoleTarget);

还有多个规则，比如

new LoggingRule() {LoggerNamePattern = "A*",                           Target = fileTarget, MinLevel = Warn,  Final = true};
new LoggingRule() {LoggerNamePattern = "A.Lot*",                       Target = fileTarget, MinLevel = Warn,  Final = true};
new LoggingRule() {LoggerNamePattern = "A.Lot.Of*",                    Target = fileTarget, MinLevel = Info,  Final = true};
new LoggingRule() {LoggerNamePattern = "A.Lot.Of.Hierarchical*",       Target = fileTarget, MinLevel = Info,  Final = true};
new LoggingRule() {LoggerNamePattern = "A.Lot.Of.Hierarchical.Rules*", Target = fileTarget, MinLevel = Debug, Final = true};

new LoggingRule() {LoggerNamePattern = "A*",                           Target = consoleTarget, MinLevel = Warn,  Final = true};
new LoggingRule() {LoggerNamePattern = "A.Lot*",                       Target = consoleTarget, MinLevel = Warn,  Final = true};
new LoggingRule() {LoggerNamePattern = "A.Lot.Of*",                    Target = consoleTarget, MinLevel = Warn,  Final = true};
new LoggingRule() {LoggerNamePattern = "A.Lot.Of.Hierarchical*",       Target = consoleTarget, MinLevel = Warn,  Final = true};
new LoggingRule() {LoggerNamePattern = "A.Lot.Of.Hierarchical.Rules*", Target = consoleTarget, MinLevel = Trace, Final = true};

我知道Target 和MinLevel 不是有效属性，但它更容易显示

Rules 必须是final，否则我的所有日​​志消息都是重复的。

编辑：用户可以在运行时为每个rule 和每个target 更改LogLevel。

问题

当我创建一个新的rule 时，我必须为此rule 设置targets。当我将多个targets 添加到一个规则时，我会在每个目标中收到消息但我只能为targets 定义LogLevel。当我添加rule 两次时，每个rule 有一个target，然后我只在控制台中而不是在文件中获取消息，因为final 停止了另一个rules。

我已经检查了 NLog 页面、NLog GitHub 和 StackOverflow 页面。他们所有的问题都是如何登录到多个目标，或者使用不同的规则登录到多个目标，但每个目标只有一个规则。

预期

为每个目标定义多个final rules 和不同的LogLevel

Answer 1

我建议不要按目标分组，而是按 logger-name-pattern 对它们进行分组，并将最具体的 logger-name-pattern 放在顶部：

new LoggingRule() {LoggerNamePattern = "A.Lot.Of.Hierarchical.Rules*", Target = fileTarget, MinLevel = Debug, Final = false};
new LoggingRule() {LoggerNamePattern = "A.Lot.Of.Hierarchical.Rules*", Target = consoleTarget, MinLevel = Trace, Final = true};

new LoggingRule() {LoggerNamePattern = "A.Lot.Of.Hierarchical*",       Target = consoleTarget, MinLevel = Warn,  Final = false};
new LoggingRule() {LoggerNamePattern = "A.Lot.Of.Hierarchical*",       Target = fileTarget, MinLevel = Info,  Final = true};

new LoggingRule() {LoggerNamePattern = "A.Lot.Of*",                    Target = fileTarget, MinLevel = Info,  Final = false};
new LoggingRule() {LoggerNamePattern = "A.Lot.Of*",                    Target = consoleTarget, MinLevel = Warn,  Final = true};

new LoggingRule() {LoggerNamePattern = "A.Lot*",                       Target = fileTarget, MinLevel = Warn,  Final = false};
new LoggingRule() {LoggerNamePattern = "A.Lot*",                       Target = consoleTarget, MinLevel = Warn,  Final = true};

new LoggingRule() {LoggerNamePattern = "A*",                           Target = fileTarget, MinLevel = Warn,  Final = false};
new LoggingRule() {LoggerNamePattern = "A*",                           Target = consoleTarget, MinLevel = Warn,  Final = true};

new LoggingRule() {LoggerNamePattern = "*",                            Target = fileTarget, MinLevel = Warn,  Final = false};
new LoggingRule() {LoggerNamePattern = "*",                            Target = consoleTarget, MinLevel = Warn,  Final = false};

您还可以创建没有任何目标的“黑洞”日志记录规则。通过设置 minLevel = Trace 和 Final = true。那么任何匹配 LoggerNamePattern 的输出都不会流向任何可能遵循的规则。

但也许我误解了这个问题。另见：https://github.com/nlog/NLog/wiki/Configuration-file#logger-name-filter