Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
## Breaking Changes (New API)
ObjectPropertyList supports the following API:
```cs
list.Add(500000);
list.Add(500001, stringArgument);
list.Add("Some text");
list.Add($"Some text with {argument}");
list.Add(500002, $"{arg1}\t{arg2}");
```
## Notes
1. All API uses that require a formatter like this:
```cs
list.Add(500002, "{0}\t{1}", arg1, arg2);
```
Should be changed to use string interpolation, for example:
```cs
list.Add(500002, $"{arg1}\t{arg2}");
```
2. The following paradigm should no longer be used:
```cs
list.Add(1061170, prop.ToString()); // strength requirement ~1_val~
```
The new string interpolation API will avoid having to convert the argument to a string before writing it to the packet. Instead use the following:
```cs
list.Add(1061170, $"{prop}"); // strength requirement ~1_val~
```
### Benchmarks
```cs
| Method | Mean | Error | StdDev | Gen 0 | Allocated |
|------------------------------- |---------:|--------:|--------:|-------:|----------:|
| BenchmarkOldOPL | 241.0 ns | 0.56 ns | 0.47 ns | 0.0105 | 88 B |
| BenchmarkStringInterpolatedOPL | 199.9 ns | 2.44 ns | 2.39 ns | - | - |
```
### Changes
- [X] Removes crash in STArray.Return when array is null.
- [X] Fixes NPE in OPL when entity is null. Serial in packet will be 0 when entity is null.
- [X] Fixes NPE in AosAttributes when Parent is null.
- [X] Changes OPL to use string interpolation.
- [X] Introduces `IPropertyList` to allow extending PropertyList for other uses.
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|---|---|---|
| .config | ||
| .github | ||
| Distribution/Data | ||
| docs | ||
| Projects | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| azure-pipelines.yml | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| GOALS.md | ||
| LICENSE | ||
| mkdocs.yml | ||
| ModernUO.sln | ||
| publish.cmd | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| RUNUO_MIGRATIONS.md | ||
| SPONSORS.md | ||
| stylecop.json | ||
| THIRD-PARTY-NOTICES | ||
| version.json | ||
ModernUO

Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Running the server
Development
Supported IDEs
Rider 2021.3+ Visual Studio 2022+
Note: VS Code is not currently supported.
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
- Run
./publish.cmd [release|debug (default: release)] [os]os- Supported operating systemswin- Windows 10/11/2016/2019/2022osx- MacOS 10.15/11.0+/12.0+ (Catalina, Big Sur, Monterey)ubuntu.16.04,ubuntu.18.04ubuntu.20.04- Ubuntu LTSlinuxmint.17,linuxmint.18,linuxmint.19- Linux Mintdebian.10,debian.11- Debiancentos.7,centos.8- CentOSfedora.32,fedora.33,fedora.34- Fedorarhel.7,rhel.8- Redhat- If blank, the operating system running the build is used. Linux Mint 20 is not supported directly yet, so build explicitly against
ubuntu.20.04instead.
Running the Server
- Follow the publish instructions
- Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory on the server
Note: If you are running a version of linux that isn't listed above, then you may have to install the following using a package manager:
libargon2-dev,libz-dev, andzstd
Thanks
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
