private static void AppendScope(IDictionary <string, object> dictionary, object scope)
{
switch (scope)
{
case null:
return;
case IReadOnlyList <KeyValuePair <string, object> > formattedLogValues:
{
if (formattedLogValues.Count > 0)
{
foreach (var value in formattedLogValues)
{
if (value.Value is MethodInfo)
{
continue;
}
dictionary[value.Key] = value.Value;
}
}
break;
}
default:
{
var appendToDictionaryMethod = ExpressionCache.GetOrCreateAppendToDictionaryMethod(scope.GetType());
appendToDictionaryMethod(dictionary, scope);
break;
}
}
}
private static void AppendScope(IDictionary <string, object> dictionary, object scope)
{
if (scope == null)
{
return;
}
// The scope can be defined using BeginScope or LogXXX methods.
// - logger.BeginScope(new { Author = "meziantou" })
// - logger.LogInformation("Hello {Author}", "meziaantou")
// Using LogXXX, an object of type FormattedLogValues is created. This type is internal but it implements IReadOnlyList, so we can use it.
// https://github.com/aspnet/Extensions/blob/cc9a033c6a8a4470984a4cc8395e42b887c07c2e/src/Logging/Logging.Abstractions/src/FormattedLogValues.cs
if (scope is IReadOnlyList <KeyValuePair <string, object> > formattedLogValues)
{
if (formattedLogValues.Count > 0)
{
foreach (var value in formattedLogValues)
{
// MethodInfo is set by ASP.NET Core when reaching a controller. This type cannot be serialized using JSON.NET, but I don't need it.
if (value.Value is MethodInfo)
{
continue;
}
dictionary[value.Key] = value.Value;
}
}
}
else
{
// The idea is to get the value of all properties of the object and add them to the dictionary.
// dictionary["Prop1"] = scope.Prop1;
// dictionary["Prop2"] = scope.Prop2;
// ...
// We always log the same objects, so we can create a cache of compiled expressions to fill the dictionary.
// Using reflection each time would slow down the logger.
var appendToDictionaryMethod = ExpressionCache.GetOrCreateAppendToDictionaryMethod(scope.GetType());
appendToDictionaryMethod(dictionary, scope);
}
}
