C#•9mo ago

✅ XmlReader generic Mapper

Hello 👋 . I am trying to create generic mapper for my project, that is using XmlReader. All my XML files have same structure, i.e.:

<ROOT>
  <OBJECT ID="52022696" OBJECTID="1456218" NAME="Abaya" TYPENAME="street" ISACTUAL="1" ISACTIVE="0"/>
  ...
</ROOT>

<ROOT>
  <OBJECT ID="52022696" OBJECTID="1456218" NAME="Abaya" TYPENAME="street" ISACTUAL="1" ISACTIVE="0"/>
  ...
</ROOT>

For model:

public class AddressObject
{
  public int Id { get; set; }

  public int ObjectId { get; set; }

  public string FullName { get; set; }
}

public class AddressObject
{
  public int Id { get; set; }

  public int ObjectId { get; set; }

  public string FullName { get; set; }
}

So, I want to use Mapper this way:

public XmlReaderCopyHelper<AddressObject> Addresses =>
    new XmlReaderCopyHelper<AddressObject>("OBJECT")
        .WithCondition("ISACTUAL", src => src == "1") // ! only if ISACTUAL is "1" map, otherwise skip
        .WithCondition("ISACTIVE", src => src == "1") // ! second condition
        .Map("ID", ao => ao.Id)
        .Map("OBJECTID", ao => ao.ObjectId)
        .Map(..., ao => ao.FullName); // ! it should map to $"{TYPENAME} {NAME}"

public XmlReaderCopyHelper<AddressObject> Addresses =>
    new XmlReaderCopyHelper<AddressObject>("OBJECT")
        .WithCondition("ISACTUAL", src => src == "1") // ! only if ISACTUAL is "1" map, otherwise skip
        .WithCondition("ISACTIVE", src => src == "1") // ! second condition
        .Map("ID", ao => ao.Id)
        .Map("OBJECTID", ao => ao.ObjectId)
        .Map(..., ao => ao.FullName); // ! it should map to $"{TYPENAME} {NAME}"

13 Replies

kurumiOP•9mo ago

let me a sec to upload full code

kurumiOP•9mo ago

https://paste.mod.gg/ajnmxvtzfudh/0 So, the questions I have: 1) How can I improve performance? 2) How can I implement .Map(..., ao => ao.FullName); // ! it should map to $"{TYPENAME} {NAME}" P.S. by it should map to $"{TYPENAME} {NAME}" I mean that my mapper should find 2 XML attributes, i.e. TYPENAME="street" and NAME="Abaya" and for property FullName of provided generic class it will make "street Abaya" (final property should be created by lambda) Also, It will great to have functionality to map more than 2 attributes for property

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kurumiOP•9mo ago

Before we start conversation, is it a good way to parse large files (few gbs) with this class, or should I create not generic parser for each model?

HtmlCompiler•9mo ago

or should I create not generic parser for each model?

how can you have this doubt after having already created XmlReaderCopyHelper<>?

kurumiOP•9mo ago

I mean, I have deals with some reflection which can slower my app, but it is too sensitive for speed, caz it is 43 gb zipped xml files

HtmlCompiler•9mo ago

you don't necessarily have to use reflection if you don't need to automate stuff, depends how many models you have also you are not caching anything in SetProperty

canton7•9mo ago

Maybe I'm missing the point but... Why not just use XmlSerializer? That does a bunch of code generation to give you pretty optimal deserialization

kurumiOP•9mo ago

It's slower then XmlReader, that's why

canton7•9mo ago

Have you read the generated code? It's literally generated code directly over XmlReader It's the same stuff you'd write by hand if you were writing a hand-optimised deserializer for a particular type

reflectronic•9mo ago

whether XmlSerializer is slower than XmlReader doesn't matter. (of course it's slower, it's at least as slow as XmlReader, because that's what it uses to do the reading.) what matters is whether XmlSerializer is slower than your mapper

canton7•9mo ago

And unless you're doing code generation, or skipping out fairly basic sanity-checks, you're not going to get faster than XmlSerializer. Heck, hand-written code will struggle to get faster

kurumiOP•9mo ago

It makes sense. I thought XmlSerializer does not use XmlReader I'll try XmlSerializer then, thx!

canton7•9mo ago

Make sure you cache the generated XmlSerialiser

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✅ XmlReader generic Mapper