c# compare two objects for changes
public static JObject FindDiff(this JToken Current, JToken Model)
{
var diff = new JObject();
if (JToken.DeepEquals(Current, Model)) return diff;
switch(Current.Type)
{
case JTokenType.Object:
{
var current = Current as JObject;
var model = Model as JObject;
var addedKeys = current.Properties().Select(c => c.Name).Except(model.Properties().Select(c => c.Name));
var removedKeys = model.Properties().Select(c => c.Name).Except(current.Properties().Select(c => c.Name));
var unchangedKeys = current.Properties().Where(c => JToken.DeepEquals(c.Value, Model[c.Name])).Select(c => c.Name);
foreach (var k in addedKeys)
{
diff[k] = new JObject
{
["+"] = Current[k]
};
}
foreach (var k in removedKeys)
{
diff[k] = new JObject
{
["-"] = Model[k]
};
}
var potentiallyModifiedKeys = current.Properties().Select(c => c.Name).Except(addedKeys).Except(unchangedKeys);
foreach (var k in potentiallyModifiedKeys)
{
var foundDiff = FindDiff(current[k], model[k]);
if(foundDiff.HasValues) diff[k] = foundDiff;
}
}
break;
case JTokenType.Array:
{
var current = Current as JArray;
var model = Model as JArray;
var plus = new JArray(current.Except(model, new JTokenEqualityComparer()));
var minus = new JArray(model.Except(current, new JTokenEqualityComparer()));
if (plus.HasValues) diff["+"] = plus;
if (minus.HasValues) diff["-"] = minus;
}
break;
default:
diff["+"] = Current;
diff["-"] = Model;
break;
}
return diff;
}
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