Weknow.Text.Json.Extensions 5.1.35

Weknow Json Extensions

Extensions for System.Text.Json

Functionality of this library includes:

• YieldWhen
• Filter
• Exclude
• Serialization
  • Convert Object into Json Element
  • Convert Json Element to string
  • Convert Json Element to Stream
  • ImmutableDictionary converter

YieldWhen

Enumerate over json elements.

With Path

Rely on path convention:

json.YieldWhen(/path convention/);

{
  "friends": [
    {
      "name": "Yaron",    
      "id": 1
    },
    {
      "name": "Aviad",   
      "id": 2
    }
  ]
}

• "friends.[].name" or "friends.*.name" will result with ["Yaron", "Aviad"]
• "friends.[0].name" or "friends.*.name" will result with ["Yaron"]
• "friends.[0].*" or "friends.*.name" will result with ["Yaron",1]

See: YieldWhen_Path_Test

With Filter

using static System.Text.Json.TraverseFlowInstruction;

var items = source.YieldWhen((json, deep, breadcrumbs) =>
{
    string last = breadcrumbs[^1];
    if(deep == 0 && last == "skills")
        return Drill;

    return deep switch
    {
        < 3 => Drill,
        _ => Do(TraverseFlow.SkipToParent),
    };
});

Filter

Filter operation, clean up the element according to a filter.
It excludes whatever doesn't match the filter

{
  "A": 10,
  "B": [
    { "Val": 40 },
    { "Val": 20 },
    { "Factor": 20 }
  ],
  "C": [0, 25, 50, 100 ],
  "Note": "Re-shape json"
}

Filter:

JsonElement source = ..;
var target = source.Filter((e, _, _) =>
            e.ValueKind != JsonValueKind.Number || e.GetInt32() > 30 
            ? TraverseFlowWrite.Drill 
            : TraverseFlowWrite.Skip);

Will result in:

{
  "B": [ { "Val": 40 }],
  "C": [ 50, 100 ],
  "Note": "Re-shape json"
}

Path based Filter:

var target = source.Filter("B.*.val");
// results: {"B":[{"Val":40},{"Val":20}]}

var target = source.Filter("B.[]");
// results: {"B":[{"Val":40},{"Val":20},{"Factor":20}]}

var target = source.Filter("B.[].Factor");
// results: {"B":[{"Factor":20}]}

var target = source.Filter("B.[1].val");
// results: {"B":[{"Val":20}]}

Exclude

Exclude is kind of opposite of Filter. It instruct which elements to remove.

{
  "A": 10,
  "B": [
    { "Val": 40 },
    { "Val": 20 },
    { "Factor": 20 }
  ],
  "C": [0, 25, 50, 100 ],
  "Note": "Re-shape json"
}

var target = source.Exclude("B.*.val");
// results: {"A":10,"B":[{"Factor":20}],"C":[0,25,50,100],"Note":"Re-shape json"}

var target = source.Exclude("B.[]");
// results: {"A":10,"B":[],"C":[],"Note":"Re-shape json"}

var target = source.Exclude("B.[1]");
// results: {"A":10,"B":[{"Val":40},{"Factor":20}],"C":[0,50,100],"Note":"Re-shape json"}

var target = source.Exclude("B");
// results: {"A":10,"C":[0,25,50,100],"Note":"Re-shape json"}

Serialization

ToJson

Convert .NET object into JsonElement.

var entity = new Entity(12, new BEntity("Z"));
JsonElement json = entity.ToJson();

var arr = new []{ 1, 2, 3 };
JsonElement json = arr.ToJson();

AsString

Convert JsonElement to string

JsonElement json = ...;
string compact = json.AsString();
string indented = json.AsIndentString();
string raw = json.GetRawText(); // same as json.AsIndentString();

ToStream

Convert JsonElement to stream

JsonElement json = ...;
Stream srm = json.ToStream();

ImmutableDictionary converter.

JsonStringEnumConverter EnumConvertor = new JsonStringEnumConverter(JsonNamingPolicy.CamelCase);
var options = new JsonSerializerOptions
{
    PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
    // Add the converter
    Converters = { EnumConvertor, JsonImmutableDictionaryConverter.Default }
};

var source = new Dictionary<ConsoleColor, string> 
{
    [ConsoleColor.Blue] = nameof(ConsoleColor.Blue),
    [ConsoleColor.White] = nameof(ConsoleColor.White)
};

string json = JsonSerializer.Serialize(source, options);
T deserialized = JsonSerializer.Deserialize<T>(json, options);