public void Select(LoggerFilterOptions options, Type providerType, string category, out LogLevel?minLevel, out Func <string, string, LogLevel, bool> filter)
{
filter = null;
minLevel = options.MinLevel;// LogLevel.Information
// Filter rule selection:
// 1. Select rules for current logger type, if there is none, select ones without logger type specified
// 2. Select rules with longest matching categories
// 3. If there nothing matched by category take all rules without category
// 3. If there is only one rule use it's level and filter
// 4. If there are multiple rules use last
// 5. If there are no applicable rules use global minimal level
// 获取 特性 [ProviderAlias("Console")] 中的别名
var providerAlias = ProviderAliasUtilities.GetAlias(providerType);
LoggerFilterRule current = null;
foreach (var rule in options.Rules)
{
if (IsBetter(rule, current, providerType.FullName, category) ||
(!string.IsNullOrEmpty(providerAlias) && IsBetter(rule, current, providerAlias, category)))
{
current = rule;
}
}
if (current != null)
{
filter = current.Filter;
minLevel = current.LogLevel;
}
}
/// 配置文件发生更改时，刷新日志过滤规则
private void RefreshFilters(LoggerFilterOptions filterOptions)
{
lock (_sync)
{
_filterOptions = filterOptions;
foreach (var registeredLogger in _loggers)
{
var logger = registeredLogger.Value;
(logger.MessageLoggers, logger.ScopeLoggers) = ApplyFilters(logger.Loggers);
}
}
}
