Passing and using a list in CodeDom dynamic method

Question

I am trying to use a simple static method to return an object to dynamically evaluate an expression. I have followed the advice outlined in the examples here: http://www.blackwasp.co.uk/RuntimeCompilation_2.aspx

For basic expressions this is working fine, but for ones that involve a .Contains() method I get an exception thrown.

Working Calls:

Console.WriteLine(DynamicCodeUtils.TestExpression("1 == 1 && (2 == 3 || 2 == 2) && 4 == 5");
Output: false

Console.WriteLine(DynamicCodeUtils.TestExpression("Math.Max(100,200)"));
Output: 200

Non-Working Call:

string _ArrayCheck = "\"1,2,3\".Split(',').ToArray().Contains(\"1\")";
Console.WriteLine(DynamicCodeUtils.TestExpression(_ArrayCheck));

Throws an exception - expected output would be "true"

Code:

public static object TestExpression(string Expression)
    {
        CSharpCodeProvider provider = new CSharpCodeProvider();
        CompilerParameters parameters = new CompilerParameters();
        parameters.GenerateExecutable = false;
        parameters.GenerateInMemory = true;
        parameters.ReferencedAssemblies.Add("System.dll");
        parameters.ReferencedAssemblies.Add("System.Xml.dll");
        parameters.ReferencedAssemblies.Add("System.Xml.Linq.dll");
        CompilerResults results = provider.CompileAssemblyFromSource(parameters, GetCode(Expression));

        var cls = results.CompiledAssembly.GetType("DynamicNS.DynamicCode");
        var method = cls.GetMethod("DynamicMethod", BindingFlags.Static | BindingFlags.Public);
        return method.Invoke(null, null);
    }

public static string[] GetCode(string Expression)
    {
        return new string[]
        {
            @"
            using System;
            using System.Linq;

            namespace DynamicNS
            {
                public static class DynamicCode
                {
                    public static object DynamicMethod()
                    {
                        return " + Expression + @";
                    }
                }
            }"
        };
    }

Answer 1

The CompilerResults type contains the property Errors. If you look into in, you will find:

error CS0234: The type or namespace name 'Linq' does not exist in the namespace 'System' (are you missing an assembly reference?)

This is because types in the System.Linq namespace (like Enumerable) are in the System.Core.dll assembly. If you add that, then your code will start working:

parameters.ReferencedAssemblies.Add("System.Core.dll");