using System.Collections.Generic; namespace System.Text.Json.Serialization.Converters { internal sealed class KeyValuePairConverter<TKey, TValue> : JsonValueConverter<KeyValuePair<TKey, TValue>> { private const string KeyName = "Key"; private const string ValueName = "Value"; private static readonly JsonEncodedText _keyName = JsonEncodedText.Encode("Key", null); private static readonly JsonEncodedText _valueName = JsonEncodedText.Encode("Value", null); internal override bool OnTryRead(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options, ref ReadStack state, out KeyValuePair<TKey, TValue> value) { if (reader.TokenType != JsonTokenType.StartObject) ThrowHelper.ThrowJsonException(null); TKey key = default(TKey); bool flag = false; TValue value2 = default(TValue); bool flag2 = false; ref reader.ReadWithVerify(); if (reader.TokenType != JsonTokenType.PropertyName) ThrowHelper.ThrowJsonException(null); string string = reader.GetString(); if (string == "Key") { ref reader.ReadWithVerify(); key = JsonSerializer.Deserialize<TKey>(ref reader, options, ref state, "Key"); flag = true; } else if (string == "Value") { ref reader.ReadWithVerify(); value2 = JsonSerializer.Deserialize<TValue>(ref reader, options, ref state, "Value"); flag2 = true; } else { ThrowHelper.ThrowJsonException(null); } ref reader.ReadWithVerify(); if (reader.TokenType != JsonTokenType.PropertyName) ThrowHelper.ThrowJsonException(null); string = reader.GetString(); if (string == "Key") { ref reader.ReadWithVerify(); key = JsonSerializer.Deserialize<TKey>(ref reader, options, ref state, "Key"); flag = true; } else if (string == "Value") { ref reader.ReadWithVerify(); value2 = JsonSerializer.Deserialize<TValue>(ref reader, options, ref state, "Value"); flag2 = true; } else { ThrowHelper.ThrowJsonException(null); } if (!flag || !flag2) ThrowHelper.ThrowJsonException(null); ref reader.ReadWithVerify(); if (reader.TokenType != JsonTokenType.EndObject) ThrowHelper.ThrowJsonException(null); value = new KeyValuePair<TKey, TValue>(key, value2); return true; } internal override bool OnTryWrite(Utf8JsonWriter writer, KeyValuePair<TKey, TValue> value, JsonSerializerOptions options, ref WriteStack state) { writer.WriteStartObject(); writer.WritePropertyName(_keyName); JsonSerializer.Serialize<TKey>(writer, value.Key, options, ref state, "Key"); writer.WritePropertyName(_valueName); JsonSerializer.Serialize<TValue>(writer, value.Value, options, ref state, "Value"); writer.WriteEndObject(); return true; } } }