NewtonSoft.Json Treating Blank Value as Null but not throwing error - json

Question

Environment
.net 7
Using Both System.Text.Json
Also NewtonSoft.Json ( 13.0.2)
Example code
string str = #"{
""DateTimeNull"":""""
}";
try
{
var t = System.Text.Json.JsonSerializer.Deserialize<Test>(str);
}
catch (JsonException ex)
{
Console.WriteLine(new { Field = ex.Path , Message = ex.Message });
}
try
{
var t = Newtonsoft.Json.JsonConvert.DeserializeObject<Test>(str);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
public class Test
{
public DateTime? DateTimeNull { get; set; }
}
In above System.Text.Json Deserlizer throw exception but newtonsoft.json line is not throwing any exception. It is converting empty value to null but I want it should thow error and due to limitation I can not move to System.Text.Json as of now.
Payload ( This is i already set in str)
Sample one
#"{
""DateTimeNull"":""""
}";
Expected result: Throw error and should not convert to null.
Sample two.
#"{
""DateTimeNull"": null
}";
Expected result: Should not throw error and it is null value and destination type is null.

Answer 1

I usually recommend to use a JsonConstructor:
var json = #"{
""DateTimeNull"":""""
}";
Test test = JsonConvert.DeserializeObject<Test>(json);
public class Test
{
public DateTime? DateTimeNull { get; set; }
[Newtonsoft.Json.JsonConstructor]
public Test(JToken DateTimeNull)
{
if (DateTimeNull.Type == JTokenType.Null) this.DateTimeNull = null;
else if ((string)DateTimeNull == string.Empty)
throw new JsonException("DateTimeNull property should not be an empty string");
else this.DateTimeNull = DateTimeNull.ToObject<DateTime>();
}
}