private static string VisitSubExpression(MemberInitExpression expression,
ParameterExpression aggregateParameter)
{
if (expression.NewExpression.Arguments?.Any(x => x.NodeType != ExpressionType.Constant) == true)
{
throw new NotImplementedException();
}
object defaultValue = Activator.CreateInstance(expression.NewExpression.Type,
expression.NewExpression.Arguments.Cast <ConstantExpression>().Select(x => x.Value).ToArray());
var sb = new StringBuilder("{ ");
bool haveAnyMembersBeenWritten = false;
foreach (var propertyOrField in expression.NewExpression.Type
.GetMembers(BindingFlags.Instance | BindingFlags.Public | BindingFlags.FlattenHierarchy)
.Where(ExpressionUtilities.ShouldSerialize))
{
if (haveAnyMembersBeenWritten)
{
sb.Append(", ");
}
var memberBinding = expression.Bindings?.SingleOrDefault(x => x.Member == propertyOrField);
if (memberBinding != null)
{
sb.Append(VisitBinding(memberBinding, aggregateParameter));
}
else
{
if (propertyOrField.MemberType == MemberTypes.Property)
{
sb.Append(ExpressionUtilities.GetQuotedJsonPropertyName(propertyOrField))
.Append(": ")
.Append(JsonConvert.SerializeObject(
((PropertyInfo)propertyOrField).GetValue(defaultValue)));
}
else if (propertyOrField.MemberType == MemberTypes.Field)
{
sb.Append(ExpressionUtilities.GetQuotedJsonPropertyName(propertyOrField))
.Append(": ")
.Append(JsonConvert.SerializeObject(
((FieldInfo)propertyOrField).GetValue(defaultValue)));
}
else
{
Debug.Fail($"{propertyOrField.MemberType} members should not be encountered here.");
}
}
haveAnyMembersBeenWritten = true;
}
sb.Append(" }");
return(sb.ToString());
}
private static string VisitBinding(MemberAssignment binding, ParameterExpression aggregateParameter,
ParameterExpression currentParameter)
{
return(ExpressionUtilities.GetQuotedJsonPropertyName(binding.Member) + ": "
+ VisitSubExpression(binding.Expression, aggregateParameter, currentParameter));
}
