Add JSON support for NodaMoney #98

This commit introduces a new dependency on System.Text.Json. It also adds new code to convert NodaMoney objects to and from JSON. This includes modifications to the NodaMoney.csproj file and the creation of MoneyJsonConverter.cs, which contains the converter implementation.

src/NodaMoney/MoneyJsonConverter.cs

@@ -0,0 +1,51 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace NodaMoney;
+
+public class MoneyJsonConverter : JsonConverter<Money>
+{
+    public override Money Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        if (reader.TokenType != JsonTokenType.StartObject)
+        {
+            throw new JsonException();
+        }
+
+        decimal amount = 0;
+        string currencyCode = null;
+
+        while (reader.Read())
+        {
+            if (reader.TokenType == JsonTokenType.EndObject)
+            {
+                return new Money(amount, Currency.FromCode(currencyCode));
+            }
+
+            if (reader.TokenType == JsonTokenType.PropertyName)
+            {
+                string propertyName = reader.GetString();
+                reader.Read();
+                switch (propertyName)
+                {
+                    case "Amount":
+                        amount = reader.GetDecimal();
+                        break;
+                    case "Currency":
+                        currencyCode = reader.GetString();
+                        break;
+                }
+            }
+        }
+
+        throw new JsonException();
+    }
+
+    public override void Write(Utf8JsonWriter writer, Money value, JsonSerializerOptions options)
+    {
+        writer.WriteStartObject();
+        writer.WriteNumber("Amount", value.Amount);
+        writer.WriteString("Currency", value.Currency.Code);
+        writer.WriteEndObject();
+    }
+}

src/NodaMoney/NodaMoney.csproj

@@ -52,6 +52,10 @@
     </PackageReference>
   </ItemGroup>
 
+  <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
+    <PackageReference Include="System.Text.Json" Version="8.0.3" />
+  </ItemGroup>
+
   <ItemGroup>
     <!-- Add InternalsVisibleTo to src projects to enable testing internal methods https://www.meziantou.net/declaring-internalsvisibleto-in-the-csproj.htm -->
     <InternalsVisibleTo Include="$(AssemblyName).Tests"/>

src/NodaMoney/packages.lock.json

@@ -35,16 +35,76 @@
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       },
+      "System.Text.Json": {
+        "type": "Direct",
+        "requested": "[8.0.3, )",
+        "resolved": "8.0.3",
+        "contentHash": "hpagS9joOwv6efWfrMmV9MjQXpiXZH72PgN067Ysfr6AWMSD1/1hEcvh/U5mUpPLezEWsOJSuVrmqDIVD958iA==",
+        "dependencies": {
+          "Microsoft.Bcl.AsyncInterfaces": "8.0.0",
+          "System.Buffers": "4.5.1",
+          "System.Memory": "4.5.5",
+          "System.Runtime.CompilerServices.Unsafe": "6.0.0",
+          "System.Text.Encodings.Web": "8.0.0",
+          "System.Threading.Tasks.Extensions": "4.5.4"
+        }
+      },
       "Text.Analyzers": {
         "type": "Direct",
         "requested": "[3.3.4, )",
         "resolved": "3.3.4",
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       },
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+        "contentHash": "3WA9q9yVqJp222P3x1wYIGDAkpjAku0TMUaaQV22g6L67AI0LdOIrVS7Ht2vJfLHGSPVuqN94vIr15qn+HEkHw==",
+        "dependencies": {
+          "System.Threading.Tasks.Extensions": "4.5.4"
+        }
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         "resolved": "1.1.0",
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+      },
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+        "resolved": "4.5.1",
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+        "contentHash": "XIWiDvKPXaTveaB7HVganDlOCRoj03l+jrwNvcge/t8vhGYKvqV+dMv6G4SAX2NoNmN0wZfVPTAlFwZcZvVOUw==",
+        "dependencies": {
+          "System.Buffers": "4.5.1",
+          "System.Numerics.Vectors": "4.4.0",
+          "System.Runtime.CompilerServices.Unsafe": "4.5.3"
+        }
+      },
+      "System.Numerics.Vectors": {
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+        "contentHash": "UiLzLW+Lw6HLed1Hcg+8jSRttrbuXv7DANVj0DkL9g6EnnzbL75EB7EWsw5uRbhxd/4YdG8li5XizGWepmG3PQ=="
+      },
+      "System.Text.Encodings.Web": {
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+        "dependencies": {
+          "System.Buffers": "4.5.1",
+          "System.Memory": "4.5.5",
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+        "dependencies": {
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+        }
       }
     },
     "net6.0": {