c#

gistfile1.cs

ITemplate Compile(string assemblyPath, string templateId, string input, List<string> usings)
{
    var providerOptions = new Dictionary<string, string>();
    providerOptions.Add("CompilerVersion", "v4.0");

    ITemplate _template = null;

    var usingBuilder = new StringBuilder();
    foreach (var @using in _usings)
    {
        usingBuilder.AppendFormat("using {0};", @using);
        usingBuilder.AppendLine();
    }

    var provider = new CSharpCodeProvider(providerOptions);
    var typeName = string.Format("Templates_Template_{0}_{1}", templateId, DateTime.Now.Ticks);
    var options = new CompilerParameters();            

    options.ReferencedAssemblies.Add("System.dll");
    options.ReferencedAssemblies.Add("System.Core.dll");
    options.ReferencedAssemblies.Add("Microsoft.CSharp.dll");
    options.ReferencedAssemblies.Add(Path.Combine(assemblyPath, "Zero.Web.dll"));
    options.ReferencedAssemblies.Add(Path.Combine(assemblyPath, "Zero.Core.dll"));    

    options.GenerateInMemory = true;

    var inputs = new[]
                     {
                        usings,
                        "constant #1",
                        "constant #2",
                         input,
                     };

    var code = string.Join("", inputs);

    CompilerResults results = provider.CompileAssemblyFromSource(
        options,
        new string[] { code });

    if (!results.Errors.HasErrors)
    {
        _template = (ITemplate)results.CompiledAssembly.CreateInstance(typeName);
        return _template;
    }


    var builder = new StringBuilder();
    foreach (object e in results.Errors)
    {
        var tmp = e.ToString();        
        builder.Append(tmp);
    }

    throw new Exception(code + "\n Compile error: " + builder);
}