internal static Symbol GetMethodOrTypeBySignature(Compilation compilation, string signature)
{
string[] parameterTypeNames;
var methodOrTypeName = ExpressionCompilerTestHelpers.GetMethodOrTypeSignatureParts(signature, out parameterTypeNames);
var candidates = compilation.GetMembers(methodOrTypeName);
var methodOrType = (parameterTypeNames == null) ?
candidates.FirstOrDefault() :
candidates.FirstOrDefault(c => parameterTypeNames.SequenceEqual(((MethodSymbol)c).Parameters.Select(p => p.Type.Name)));
Assert.False(methodOrType == null, "Could not find method or type with signature '" + signature + "'.");
return(methodOrType);
}