Debugging

Step-into debugging

PM> Install-Package ExpressionDebugger

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

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!!

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();

Visual Studio for 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