private (Expression BodyExpression, Func <string, object> Converter) GetValueBodyExpression(ParameterExpression entityParameter, string pathToProperty)
{
if (string.IsNullOrWhiteSpace(pathToProperty))
{
return(entityParameter, i => i);
}
var pathSegments = this.ParsePropertyPath(pathToProperty);
// INavigationSelector navigationSelector = null;
ISearchDescriptor objectDescriptor = this;
Expression valueExpression = entityParameter;
foreach (var pathSegment in pathSegments)
{
if (objectDescriptor.Navigations.TryGetValue(pathSegment, out var navigation))
{
valueExpression = GetExpressionBodyReferencingValue(navigation.GetTargetExpression, valueExpression);
// valueExpression = Expression.Invoke(navigation.GetTargetExpression, valueExpression);
objectDescriptor = navigation.ObjectDescriptor;
}
else if (objectDescriptor.Fields.TryGetValue(pathSegment, out var field))
{
return(GetExpressionBodyReferencingValue(field.GetValueExpression, valueExpression), field.ConvertFromString);
// return (Expression.Invoke(field.GetValueExpression, valueExpression), field.ConvertFromString);
}
}
var defaultField = objectDescriptor.DefaultValueProperty;
return(GetExpressionBodyReferencingValue(defaultField.GetValueExpression, valueExpression), defaultField.ConvertFromString);
// return (Expression.Invoke(defaultField.GetValueExpression, valueExpression), defaultField.ConvertFromString);
}
private SearchMetadata GetStructure(string name, ISearchDescriptor descriptor)
=> new SearchMetadata(
name,
descriptor.Name,
descriptor.Fields.Keys
.Select(k => new SearchMetadata(k, descriptor.Name))
.Union(descriptor.Navigations.Select(v => GetStructure(v.Key, v.Value.ObjectDescriptor))
).ToList());