When using TypeAdapterConfig.GlobalSettings.Default.IgnoreNullValues(true), it causes the Mapper function to be called twice.

@DocSvartz is already working on this.

Since Jan 30, 2025.

There is example code following this. When Adapt() is called, it can be seen from the console that SummaryDetail runs twice. I would like to ask what is the reason for this and how to avoid it. I have also uploaded the test code for the entire project in the attachment. Thank you all for helping me answer this.

Please attach the test code file, and I will take a look to provide further assistance.

[TestMapster.zip](https://github.com/user-attachments/files/17901999/TestMapster.zip)

Program.cs：

TypeAdapterConfig.GlobalSettings.Default.IgnoreNullValues(true);
TypeAdapterConfig.GlobalSettings.Scan(Assembly.Load("TestMapster"));

TestInput.cs：

public class TestInput
{
public string Summary { get; set; }
}

public class TestView
{
public string Summary { get; set; }
}

MapperConfig.cs

public class MapperConfig : IRegister
{
public void Register(TypeAdapterConfig config)
{
config.ForType()
.Map(dest => dest.Summary, src => SummaryDetail(src.Summary))
;
}

private static string SummaryDetail(string s)
{
Console.WriteLine($"================{s}================");
return s + " plus";
}
}

Controller.cs

[HttpGet]
public TestView Get()
{
var input = new TestInput { Summary = "Hello World" };
return input.Adapt();
}