c# - 如何通过比较两个 c# 对象来创建 JsonPatchDocument？

Question

鉴于我有两个相同类型的 c# 对象，我想比较它们以创建一个 JsonPatchDocument。

我有一个这样定义的 StyleDetail 类:

public class StyleDetail
    {
        public string Id { get; set; }
        public string Code { get; set; }
        public string Name { get; set; }
        public decimal OriginalPrice { get; set; }
        public decimal Price { get; set; }
        public string Notes { get; set; }
        public string ImageUrl { get; set; }
        public bool Wishlist { get; set; }
        public List<string> Attributes { get; set; }
        public ColourList Colours { get; set; }
        public SizeList Sizes { get; set; }
        public ResultPage<Style> Related { get; set; }
        public ResultPage<Style> Similar { get; set; }
        public List<Promotion> Promotions { get; set; }
        public int StoreStock { get; set; }
        public StyleDetail()
        {
            Attributes = new List<string>();
            Colours = new ColourList();
            Sizes = new SizeList();
            Promotions = new List<Promotion>();
        }
    }

如果我有两个 StyleDetail 对象

StyleDetail styleNew = db.GetStyle(123);
StyleDetail styleOld = db.GetStyle(456);

我现在想创建一个 JsonPatchDocument，这样我就可以将差异发送到我的 REST API...该怎么做？？

JsonPatchDocument patch = new JsonPatchDocument();
// Now I want to populate patch with the differences between styleNew and styleOld - how?

在 javascript 中，有一个库可以做到这一点 https://www.npmjs.com/package/rfc6902

Calculate diff between two objects:

rfc6902.createPatch({first: 'Chris'}, {first: 'Chris', last: 'Brown'});

[ { op: 'add', path: '/last', value: 'Brown' } ]

但我正在寻找一个 c# 实现

Answer 1

让我们滥用您的类可序列化为 JSON 的事实!这是补丁创建者的第一次尝试，它不关心您的实际对象，只关心该对象的 JSON 表示。

public static JsonPatchDocument CreatePatch(object originalObject, object modifiedObject)
{
    var original = JObject.FromObject(originalObject);
    var modified = JObject.FromObject(modifiedObject);

    var patch = new JsonPatchDocument();
    FillPatchForObject(original, modified, patch, "/");

    return patch;
}

static void FillPatchForObject(JObject orig, JObject mod, JsonPatchDocument patch, string path)
{
    var origNames = orig.Properties().Select(x => x.Name).ToArray();
    var modNames = mod.Properties().Select(x => x.Name).ToArray();

    // Names removed in modified
    foreach (var k in origNames.Except(modNames))
    {
        var prop = orig.Property(k);
        patch.Remove(path + prop.Name);
    }

    // Names added in modified
    foreach (var k in modNames.Except(origNames))
    {
        var prop = mod.Property(k);
        patch.Add(path + prop.Name, prop.Value);
    }

    // Present in both
    foreach (var k in origNames.Intersect(modNames))
    {
        var origProp = orig.Property(k);
        var modProp = mod.Property(k);

        if (origProp.Value.Type != modProp.Value.Type)
        {
            patch.Replace(path + modProp.Name, modProp.Value);
        }
        else if (!string.Equals(
                        origProp.Value.ToString(Newtonsoft.Json.Formatting.None),
                        modProp.Value.ToString(Newtonsoft.Json.Formatting.None)))
        {
            if (origProp.Value.Type == JTokenType.Object)
            {
                // Recurse into objects
                FillPatchForObject(origProp.Value as JObject, modProp.Value as JObject, patch, path + modProp.Name +"/");
            }
            else
            {
                // Replace values directly
                patch.Replace(path + modProp.Name, modProp.Value);
            }
        }       
    }
}

用法:

var patch = CreatePatch(
    new { Unchanged = new[] { 1, 2, 3, 4, 5 }, Changed = "1", Removed = "1" },
    new { Unchanged = new[] { 1, 2, 3, 4, 5 }, Changed = "2", Added = new { x = "1" } });

// Result of JsonConvert.SerializeObject(patch)
[
  {
    "path": "/Removed",
    "op": "remove"
  },
  {
    "value": {
      "x": "1"
    },
    "path": "/Added",
    "op": "add"
  },
  {
    "value": "2",
    "path": "/Changed",
    "op": "replace"
  }
]