Evaluate C# Code (Eval Function)

<br />
using System;<br />
using System.CodeDom.Compiler;<br />
using System.Collections.Generic;<br />
using System.Text;<br />
using System.Windows.Forms;<br />
using Microsoft.CSharp;<br />
<br />
namespace Test<br />
{<br />
    /// <summary><br />
    /// C# Code Evaluator<br />
    /// Based on work by Kim Hauser found at http://www.codeproject.com/csharp/evalcscode.asp<br />
    /// </summary><br />
    class CSEvaluator<br />
    {<br />
        /// <summary><br />
        /// Assemblies are what follow "using"<br />
        /// </summary><br />
        public List<string> Assemblies;<br />
        /// <summary><br />
        /// References are in the Solution Explorer in the References folder<br />
        /// </summary><br />
        public List<string> References;<br />
        /// <summary><br />
        /// Namespace to evaluate in, in case you want to be able to access external classes<br />
        /// </summary><br />
        public string Namespace;<br />
<br />
        public CSEvaluator()<br />
        {<br />
            References = new List<string>();<br />
            // Adding default References<br />
            References.Add("System");<br />
            References.Add("System.Drawing");<br />
            References.Add("System.Windows.Forms");<br />
            References.Add("System.Xml");<br />
<br />
            Assemblies = new List<string>();<br />
            // Adding default assemblies<br />
            Assemblies.Add("System");<br />
            Assemblies.Add("System.Drawing");<br />
            Assemblies.Add("System.Drawing.Drawing2D"); // notice that Drawing2D is not in the list of references<br />
            Assemblies.Add("System.Windows.Forms");     //    this is because System.Drawing is the reference for it<br />
            Assemblies.Add("System.Xml");<br />
<br />
            Namespace = this.GetType().Namespace.ToString();<br />
        }<br />
<br />
        /// <summary><br />
        /// Evaluates C# Code<br />
        /// </summary><br />
        /// <param name="sCSCode">The Code to evaluate</param><br />
        /// <param name="sParms">parameter string, i.e. "string sCSCode, string sParms, object[] oParms"</param><br />
        /// <param name="oParms">array of parameter objects</param><br />
        /// <returns></returns><br />
        public object Eval(string sCSCode, string sParms, object[] oParms)<br />
        {<br />
            CompilerParameters cp = new CompilerParameters();<br />
<br />
            // load references<br />
            foreach (string r in References)<br />
                cp.ReferencedAssemblies.Add(r + ".dll");<br />
<br />
            cp.CompilerOptions = "/t:library";<br />
            cp.GenerateInMemory = true;<br />
<br />
            StringBuilder sb = new StringBuilder("");<br />
            // load assemblies<br />
            foreach (string s in Assemblies)<br />
                sb.Append("using " + s + ";\n");<br />
<br />
            sb.Append("\nnamespace " + Namespace + "\n{\n");<br />
            sb.Append("\tpublic class temp_Eval\n\t{\n");<br />
            sb.Append("\t\tpublic object Eval(" + sParms + ")\n\t\t{\n");<br />
            sb.Append("\t\t\treturn " + sCSCode + "; \n");<br />
            sb.Append("\t\t}\n");<br />
            sb.Append("\t}\n");<br />
            sb.Append("}\n");<br />
<br />
            CompilerResults cr = CodeDomProvider.CreateProvider("CSharp").CompileAssemblyFromSource(cp, sb.ToString());<br />
            if (cr.Errors.Count > 0)<br />
            {<br />
                MessageBox.Show("ERROR: " + cr.Errors[0].ErrorText,<br />
                   "Error evaluating cs code", MessageBoxButtons.OK,<br />
                   MessageBoxIcon.Error);<br />
                return null;<br />
            }<br />
<br />
            // *** Below this point is a work in progress, watch out for falling debris ***<br />
<br />
            //AppDomain evalDomain = AppDomain.CreateDomain("evalDomain");<br />
            System.Reflection.Assembly a = cr.CompiledAssembly;<br />
            //evalDomain.DefineDynamicAssembly(a.GetName(), System.Reflection.Emit.AssemblyBuilderAccess.Run); // problem here can be solved with MarshalByRefObject<br />
            //object o = evalDomain.CreateInstance(a.GetName().ToString(), Namespace + ".temp_Eval"); // it probably won't work like this<br />
            object o = a.CreateInstance(Namespace + ".temp_Eval");<br />
<br />
            Type t = o.GetType();<br />
            System.Reflection.MethodInfo mi = t.GetMethod("Eval");<br />
<br />
            object ec = mi.Invoke(o, oParms);<br />
<br />
            //AppDomain.Unload(evalDomain);<br />
            return ec;<br />
        }<br />
    }<br />
}<br />