private static AstFilterField TranslateWithIntIndex(TranslationContext context, MethodCallExpression expression, MethodInfo method, Expression fieldExpression, int index)
{
var field = ExpressionToFilterFieldTranslator.TranslateEnumerable(context, fieldExpression);
if (field.Serializer is IBsonArraySerializer arraySerializer &&
arraySerializer.TryGetItemSerializationInfo(out var itemSerializationInfo))
{
var itemSerializer = itemSerializationInfo.Serializer;
if (method.ReturnType.IsAssignableFrom(itemSerializer.ValueType))
{
return(field.SubField(index.ToString(), itemSerializer));
}
}
throw new ExpressionNotSupportedException(expression);
}
public static AstFilterField Translate(TranslationContext context, MethodCallExpression expression)
{
var method = expression.Method;
var arguments = expression.Arguments;
if (method.IsStatic &&
method.Name == "First" &&
arguments.Count == 1)
{
var enumerableFieldAst = ExpressionToFilterFieldTranslator.TranslateEnumerable(context, arguments[0]);
if (enumerableFieldAst.Serializer is IBsonArraySerializer arraySerializer &&
arraySerializer.TryGetItemSerializationInfo(out var itemSerializationInfo))
{
var itemSerializer = itemSerializationInfo.Serializer;
if (method.ReturnType.IsAssignableFrom(itemSerializer.ValueType))
{
return(enumerableFieldAst.SubField("0", itemSerializer));
}
}
}
throw new ExpressionNotSupportedException(expression);
}
