private object JoinValuesOrBindings(IList <object> fragments)
{
if (fragments.All(f => f is string))
{
return(string.Join("_", fragments));
}
else
{
BindingCompilationService service = null;
var result = new ParametrizedCode.Builder();
var first = true;
foreach (var f in fragments)
{
if (!first | (first = false))
{
result.Add("+'_'+");
}
if (f is IValueBinding binding)
{
service = service ?? binding.GetProperty <BindingCompilationService>(ErrorHandlingMode.ReturnNull);
result.Add(binding.GetParametrizedKnockoutExpression(this, unwraped: true), 14);
}
else
{
result.Add(JavascriptCompilationHelper.CompileConstant(f));
}
}
if (service == null)
{
throw new NotSupportedException();
}
return(ValueBindingExpression.CreateBinding <string>(service.WithoutInitialization(), h => null, result.Build(new OperatorPrecedence())));
}
}
