bool TryConvertEnumerable(object value, Destructuring destructuring, Type valueType, out LogEventPropertyValue result)
{
if (value is IEnumerable enumerable)
{
// Only dictionaries with 'scalar' keys are permitted, as
// more complex keys may not serialize to unique values for
// representation in sinks. This check strengthens the expectation
// that resulting dictionary is representable in JSON as well
// as richer formats (e.g. XML, .NET type-aware...).
// Only actual dictionaries are supported, as arbitrary types
// can implement multiple IDictionary interfaces and thus introduce
// multiple different interpretations.
if (TryGetDictionary(value, valueType, out var dictionary))
{
result = new DictionaryValue(MapToDictionaryElements(dictionary, destructuring));
return true;
IEnumerable<KeyValuePair<ScalarValue, LogEventPropertyValue>> MapToDictionaryElements(IDictionary dictionaryEntries, Destructuring destructure)
{
var count = 0;
foreach (DictionaryEntry entry in dictionaryEntries)
{
if (++count > _maximumCollectionCount)
{
yield break;
}
var pair = new KeyValuePair<ScalarValue, LogEventPropertyValue>(
(ScalarValue)_depthLimiter.CreatePropertyValue(entry.Key, destructure),
_depthLimiter.CreatePropertyValue(entry.Value, destructure));
if (pair.Key.Value != null)
yield return pair;
}
}
}
result = new SequenceValue(MapToSequenceElements(enumerable, destructuring));
return true;
IEnumerable<LogEventPropertyValue> MapToSequenceElements(IEnumerable sequence, Destructuring destructure)
{
var count = 0;
foreach (var element in sequence)
{
if (++count > _maximumCollectionCount)
{
yield break;
}
yield return _depthLimiter.CreatePropertyValue(element, destructure);
}
}
}
result = null;
return false;
}
TemplatePropertyValue CreatePropertyValue(object value, Destructuring destructuring, int depth)
{
if (value == null)
{
return(new ScalarValue(null));
}
if (destructuring == Destructuring.Stringify)
{
return(new ScalarValue(value.ToString()));
}
var valueType = value.GetType();
var limiter = new DepthLimiter(depth, _maximumDestructuringDepth, this);
foreach (var scalarConversionPolicy in _scalarConversionPolicies)
{
ScalarValue converted;
if (scalarConversionPolicy.TryConvertToScalar(value, limiter, out converted))
{
return(converted);
}
}
if (destructuring == Destructuring.Destructure)
{
foreach (var destructuringPolicy in _destructuringPolicies)
{
TemplatePropertyValue result;
if (destructuringPolicy.TryDestructure(value, limiter, out result))
{
return(result);
}
}
}
var enumerable = value as IEnumerable;
if (enumerable != null)
{
// Only dictionaries with 'scalar' keys are permitted, as
// more complex keys may not serialize to unique values for
// representation in sinks. This check strengthens the expectation
// that resulting dictionary is representable in JSON as well
// as richer formats (e.g. XML, .NET type-aware...).
// Only actual dictionaries are supported, as arbitrary types
// can implement multiple IDictionary interfaces and thus introduce
// multiple different interpretations.
if (IsValueTypeDictionary(valueType))
{
Func <object, object> getKey;
Func <object, object> getValue;
#if !REFLECTION_API_EVOLVED // https://blogs.msdn.microsoft.com/dotnet/2012/08/28/evolving-the-reflection-api/
PropertyInfo keyProperty = null;
getKey = o => (keyProperty ?? (keyProperty = o.GetType().GetProperty("Key"))).GetValue(o, null);
PropertyInfo valueProperty = null;
getValue = o => (valueProperty ?? (valueProperty = o.GetType().GetProperty("Value"))).GetValue(o, null);
#else
PropertyInfo keyProperty = null;
getKey = o => (keyProperty ?? (keyProperty = o.GetType().GetRuntimeProperty("Key"))).GetValue(o);
PropertyInfo valueProperty = null;
getValue = o => (valueProperty ?? (valueProperty = o.GetType().GetRuntimeProperty("Value"))).GetValue(o);
#endif
// TODO: stop using LINQ
return(new DictionaryValue(enumerable
.Cast <object>()
.Where(o => o != null)
.Select(o => new { Key = getKey(o), Value = getValue(o) })
.Select(o => new KeyValuePair <ScalarValue, TemplatePropertyValue>(
key: (ScalarValue)limiter.CreatePropertyValue(o.Key, destructuring),
value: limiter.CreatePropertyValue(o.Value, destructuring))
)
));
}
return(new SequenceValue(
enumerable.Cast <object>().Select(o => limiter.CreatePropertyValue(o, destructuring))));
}
if (destructuring == Destructuring.Destructure)
{
var type = value.GetType();
var typeTag = type.Name;
#if REFLECTION_API_EVOLVED
if (typeTag.Length <= 0 || IsCompilerGeneratedType(type))
{
typeTag = null;
}
#else
if (typeTag.Length <= 0 || !char.IsLetter(typeTag[0]))
{
typeTag = null;
}
#endif
return(new StructureValue(GetProperties(value, limiter), typeTag));
}
return(new ScalarValue(value.ToString()));
}
TemplatePropertyValue CreatePropertyValue(object value, Destructuring destructuring, int depth)
{
if (value == null)
return new ScalarValue(null);
if (destructuring == Destructuring.Stringify)
return new ScalarValue(value.ToString());
var valueType = value.GetType();
var limiter = new DepthLimiter(depth, _maximumDestructuringDepth, this);
foreach (var scalarConversionPolicy in _scalarConversionPolicies)
{
ScalarValue converted;
if (scalarConversionPolicy.TryConvertToScalar(value, limiter, out converted))
return converted;
}
if (destructuring == Destructuring.Destructure)
{
foreach (var destructuringPolicy in _destructuringPolicies)
{
TemplatePropertyValue result;
if (destructuringPolicy.TryDestructure(value, limiter, out result))
return result;
}
}
#region IEnumerable->SequenceValue|DictionaryValue
var enumerable = value as IEnumerable;
if (enumerable != null)
{
// Only dictionaries with 'scalar' keys are permitted, as
// more complex keys may not serialize to unique values for
// representation in sinks. This check strengthens the expectation
// that resulting dictionary is representable in JSON as well
// as richer formats (e.g. XML, .NET type-aware...).
// Only actual dictionaries are supported, as arbitrary types
// can implement multiple IDictionary interfaces and thus introduce
// multiple different interpretations.
if (IsValueTypeDictionary(valueType))
{
Func<object, object> getKey;
Func<object, object> getValue;
#if USE_REFLECTION_40
PropertyInfo keyProperty = null;
getKey = o => (keyProperty ?? (keyProperty = o.GetType().GetProperty("Key"))).GetValue(o, null);
PropertyInfo valueProperty = null;
getValue = o => (valueProperty ?? (valueProperty = o.GetType().GetProperty("Value"))).GetValue(o, null);
#else
PropertyInfo keyProperty = null;
getKey = o => (keyProperty ?? (keyProperty = o.GetType().GetRuntimeProperty("Key"))).GetValue(o);
PropertyInfo valueProperty = null;
getValue = o => (valueProperty ?? (valueProperty = o.GetType().GetRuntimeProperty("Value"))).GetValue(o);
#endif
return new DictionaryValue(enumerable
.Cast<object>()
.Where(o => o != null)
.Select(o => new { Key = getKey(o), Value = getValue(o) })
.Select(o => new KeyValuePair<ScalarValue, TemplatePropertyValue>(
key: (ScalarValue)limiter.CreatePropertyValue(o.Key, destructuring),
value: limiter.CreatePropertyValue(o.Value, destructuring))
)
);
}
return new SequenceValue(
enumerable.Cast<object>().Select(o => limiter.CreatePropertyValue(o, destructuring)));
}
#endregion
if (destructuring == Destructuring.Destructure)
{
var typeTag = value.GetType().Name;
if (typeTag.Length <= 0 || !char.IsLetter(typeTag[0]))
typeTag = null;
return new StructureValue(GetProperties(value, limiter), typeTag);
}
return new ScalarValue(value.ToString());
}
