FastExpressionCompiler.LightExpression 3.0.0-preview-07

• .NETFramework 4.5

  • System.ValueTuple (>= 4.5.0)

• .NETStandard 2.0

  • System.Dynamic.Runtime (>= 4.3.0)
  • System.Reflection.Emit.Lightweight (>= 4.7.0)

## v3.0.0 - Major feature release

The version contains a lot of fixes and improvements and hopefully as-little-as-possible breaking changes.

### **FastExpressionCompiler** and **FastExpressionCompiler.LightExpression**

- Performance and memory consumption is improved, especially for the expressions with the closure and for expressions with the nested lambdas.
- Filled the gaps in the expressions support.
- Many fixes in the IL emit.
- Adds `ToCSharpString()` to output the compile-able C# code described by the expression (tries hard).
- Adds `ToExpressionString()` to output the valid expression construction syntax, so given an expression object you'll get e.g. `Lambda(New(...))`.
- Adds optional `enum CompilerFlags { Default, NoInvocationLambdaInlining, EnableDelegateDebugInfo}` parameter for the compilation
- `EnableDelegateDebugInfo` adds the diagnostic info into the compiled delegate including its source Expression and C# code. Can be used as following:
```cs
   var f = e.CompileFast(true, CompilerFlags.EnableDelegateDebugInfo);
   var di = f.Target as IDelegateDebugInfo;
   Assert.IsNotNull(di.Expression);
   Assert.IsNotNull(di.ExpressionString);
   Assert.IsNotNull(di.CSharpString);
```

### **FastExpressionCompiler.LightExpression**

- Now includes the `ExpressionVisitor`.
- Improves the compatibility (the drop-in replacement) between `FastExpressionCompiler.LightExpression.Expression` and `System.Linq.Expression`.
- Decreasing the memory consumed by the created expressions, plus implementing the `IArgumentProvider` and `IParameterProvider` for some of the expressions.


### The full list of fixes

[Milestone v3.0.0](https://github.com/dadhi/FastExpressionCompiler/milestone/19)