Can JavascriptSerializer Serialize Lists to JSON in .NET?

Can JavascriptSerializer in .NET serialize a list to JSON?

Suppose your object model contains MyObjectInJson, whose property ObjectInJson stores the serialized version of the nested list. Currently, you are manually serializing the list like this:

<code class="language-csharp">StringBuilder TheListBuilder = new StringBuilder();

TheListBuilder.Append("[");
int TheCounter = 0;

foreach (MyObjectInJson TheObject in TheList)
{
  TheCounter++;
  TheListBuilder.Append(TheObject.ObjectInJson);

  if (TheCounter != TheList.Count())
  {
    TheListBuilder.Append(",");
  }
}
TheListBuilder.Append("]");

return TheListBuilder.ToString();</code>

JavascriptSerializer Is it possible to achieve the same result?

Alternatives to JavascriptSerializer

For .NET 6.0 and above, it is recommended to use the built-in System.Text.Json parser. It serializes lists efficiently without reflection, like this:

<code class="language-csharp">using System.Text.Json;
using System.Text.Json.Serialization;

var aList = new List<myobjectinjson>
{
    new(1, "1"),
    new(2, "2")
};

var json = JsonSerializer.Serialize(aList, Context.Default.ListMyObjectInJson);
Console.WriteLine(json);

return;

public record MyObjectInJson
(
    long ObjectId,
    string ObjectInJson
);

[JsonSerializable(typeof(List<myobjectinjson>))]
internal partial class Context : JsonSerializerContext
{
}</code>

For previous .NET versions (e.g., Core 2.2 and earlier), Newtonsoft JSON.Net is a viable alternative:

<code class="language-csharp">using Newtonsoft.Json;

var json = JsonConvert.SerializeObject(aList);</code>

Consider installing this package if necessary: ​​

<code>PM> Install-Package Newtonsoft.Json</code>

For ease of reference, the original method using JavaScriptSerializer is provided:

<code class="language-csharp">// 需要引用 System.Web.Extensions

using System.Web.Script.Serialization;

var jsonSerialiser = new JavaScriptSerializer();
var json = jsonSerialiser.Serialize(aList);</code>

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