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This Package allows you to perform step-into debugging using Roslyn!

    PM> Install-Package ExpressionDebugger

Usage

Then add following code on start up (or anywhere before mapping is compiled)

TypeAdapterConfig.GlobalSettings.Compiler = exp => exp.CompileWithDebugInfo();

Now in your mapping code (only in DEBUG mode).

var dto = poco.Adapt<SimplePoco, SimpleDto>(); //<--- you can step-into this function!!

step-into-debugging-screenshot

Using internal classes or members

private, protected and internal aren't allowed in debug mode.

Get mapping script

We can also see how Mapster generates mapping logic with ToScript method.

var script = poco.BuildAdapter()
                .CreateMapExpression<SimpleDto>()
                .ToScript();

Specifics for Visual Studio on Mac

To step-into debugging, you might need to emit file

var opt = new ExpressionCompilationOptions { EmitFile = true };
TypeAdapterConfig.GlobalSettings.Compiler = exp => exp.CompileWithDebugInfo(opt);
...
var dto = poco.Adapt<SimplePoco, SimpleDto>(); //<-- you can step-into this function!!

Do not worry about performance

In RELEASE mode, Roslyn compiler is actually faster than default dynamic compilation by 2x. Here is the result:

Method Mean StdDev Error Gen 0 Gen 1 Gen 2 Allocated
'Mapster 4.1.1' 115.31 ms 0.849 ms 1.426 ms 31000.0000 - - 124.36 MB
'Mapster 4.1.1 (Roslyn)' 53.55 ms 0.342 ms 0.654 ms 31100.0000 - - 124.36 MB
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