C#: implement C# loader plugin

[Kybxd]

• close C#: add loader plugin for C# #16

What should we have learned?

• Protocol Buffer Basics: C#
• C# Generated Code Guide
• Protocol Buffers .NET Runtime Library API Reference

C# code style:

• Common C# code conventions
• .NET Runtime Coding Guidelines
• Use a C# style guide for clean and scalable game code (Unity 6 edition)

Example (in practice by a Unity Game)

#region This file is auto generated. DO NOT EDIT.
using Protoconf;
using System;
using System.IO;
using System.IO.Compression;
using Google.Protobuf;
public static class Datatable
{
    public static void MergeFrom(byte[] data)
    {
        using (var ms = new MemoryStream(data))
        {
            MergeFromZip(ms);
        }
    }
    private static void MergeFromZip(MemoryStream ms)
    {
        ZipArchive zipArchive = new ZipArchive(ms);
        foreach (ZipArchiveEntry entry in zipArchive.Entries)
        {

            if (entry.Length > 0)
            {
                string fileName = entry.Name;
                int dotIndex = fileName.LastIndexOf('.');
                if (dotIndex > 0)
                {
                    fileName = fileName.Substring(0, dotIndex);
                }
                using (Stream entryStream = entry.Open())
                {
                    using (MemoryStream memoryStream = new MemoryStream())
                    {
                        entryStream.CopyTo(memoryStream);
                        memoryStream.Position = 0;
                        SetConf(fileName, memoryStream);
                    }
                }
            }
        }
    }
    public static HeroConf HeroConf { get; private set; }
    public static ItemConf ItemConf { get; private set; }
    public static VipConf VipConf { get; private set; }

    private static void SetConf(string name, MemoryStream ms)
    {
        switch (name)
        {
            case "HeroConf":
                HeroConf = Deserialize<HeroConf>(ms);
                break;
            case "ItemConf":
                ItemConf = Deserialize<ItemConf>(ms);
                break;
            case "VipConf":
                VipConf = Deserialize<VipConf>(ms);
                break;

            default:
                throw new Exception($"unknown config: {name}");
        }
    }
    private static T Deserialize<T>(MemoryStream ms)
    {
        Type protoType = typeof(T);
        IMessage protoObject = Activator.CreateInstance(protoType) as IMessage;
        protoObject.MergeFrom(ms);
        return (T)protoObject;
    }
}

#endregion

[Imran-imtiaz48]

Review Comment on helper.go:

The newly added Indent function:

func Indent(depth int) string {
	return strings.Repeat("    ", depth)
}

Explanation:
This utility function generates a string consisting of depth repetitions of four spaces. It's a concise and idiomatic way to create indentation for generated code, improving readability and maintainability in code generation scenarios. Whenever you need to output a line with a certain indentation level, you can simply call Indent(level) to get the appropriate amount of leading spaces.

Suggestion:
The implementation is clear and effective. If you anticipate changes to the indent style (for example, switching from 4 spaces to a tab), you could consider defining the indent string as a constant at the top of the file for easier updates:

const indentString = "    "

func Indent(depth int) string {
	return strings.Repeat(indentString, depth)
}

But this is optional. The current code is good as-is!

---

[wenchy]

Hi, @pengjipan! please review this PR (tableau C# loader protoc plugin). As you are an experienced and senior C# developer.

[wenchy]

Add the C# code style, which we should obey:

• Common C# code conventions
• Use a C# style guide for clean and scalable game code (Unity 6 edition)

[wenchy]

Generated code files should have suffix: .pc.cs, which C++ and Go also uses.

[wenchy]

DO NOT USE Microsoft Visual Studio, we should use just VSCode.

See https://code.visualstudio.com/docs/languages/csharp

[Kybxd]

This is the default file content created by dotnet new sln

[wenchy]

About C# language version, compiler version, and runtime version:

1. https://docs.unity3d.com/6000.0/Documentation/Manual/csharp-compiler.html
2. https://docs.unity3d.com/6000.0/Documentation/Manual/dotnet-profile-support.html
3. https://www.reddit.com/r/Unity3D/comments/1e9vjiz/any_news_about_unity_upgrading_to_new_net_runtime/

We should constrain them accurately.