public class CallClass
{
    public CallClass()
    {
    }
    public void SetAutoResetEvent(string id,object objResult)
    {

    }
}

CallClass cc=new CallClass();
browser.JavascriptObjectRepository.Register("bound", cc, false);

CefSharp.BindObjectAsync('bound');

bound.SetAutoResetEvent('ID String','ResultString');

var strJs = @"
(function(){
    try{
        alert("执行成功");
    }catch(e){
        alert("error:"+e.description);
    }
    return true;
})();
";
var bResult=browser.EvaluateScriptAsync(strJs).Result.Result;