NReco Framework Common Infrastructure

This library is used in NReco Framework applications.

features

Lambda expression parser (ability to parse expression represented as string into LINQ expression and compile lambda delegate). Portable (PCL) version is available!
Delegate adapters for:
- harmonization .NET delegates of different types with compatible signature
- delegates partial application
- lazy delegate proxy
Runtime .NET types conversion mechanism (extends .NET component model converters) for transparent conversions:
- generic dictionary and non-generic dictrionary
- generic list and non-generic list
- between delegate types with compatible signatures
- other useful conversions
Free and open source (LGPL)

links

Nuget packages	NReco Lib (.NET Framework 4.0) NReco.LambdaParser (PCL, .NET Core)
Source code	NReco Lib on GitHub NReco LambdaParser on GitHub
Documentation	NReco Lib API Reference

how to use

Install NReco nuget package and use one of the following code snippets:

Convert Hashtable into generic dictionary:

var hashMap = new Hashtable() { { "a", 1} };
var genericHashMapWrapper = NReco.Converting.ConvertManager.ChangeType( h, typeof(IDictionary<string,object>) );

Convert func delegates:

Func<int,string> f1 = (i) => { return i.ToString(); };
var f2 = NReco.Converting.ConvertManager.ChangeType( f1, typeof(Func<string,object>) );
Console.WriteLine(f2("1")); // --> 1
f2( "a" ); // --> runtime convert exception

Delegate partial application:

Func<int,int,int> f1 = (a,b) => { return a/b; };
var f2 = (new NReco.PartialDelegateAdapter(f1, new[] {  NReco.PartialDelegateAdapter.KeepArg, 2 })).GetDelegate<Func<int,int>>();
Console.WriteLine(f2(2)); // --> 4

Dynamic lambda parser:

var lambdaParser = new NReco.LambdaParser();
Console.WriteLine( lambdaParser.Eval("1+2", new Dictionary<string,object>() ) ); // --> 3

var varContext = new Dictionary<string,object>();
varContext["pi"] = 3.14M;
varContext["one"] = 1M;
varContext["two"] = 2M;
varContext["test"] = "test";
Console.WriteLine( lambdaParser.Eval("pi>one && 0<one ? (1+8)/3+1*two : 0", varContext) ); // --> 5

More examples: LambdaParserTests