CEFSharp致性JS脚本并获取返回数据

CEFSharp中需要用js脚本去获取一部分值，并进行返回

//StringBuilder sb = new StringBuilder();
//sb.AppendLine("function tempFunction() {");
////sb.AppendLine(" return document.body.innerHTML; "); 
//sb.AppendLine(" return window.dmtrack_pageid; ");
//sb.AppendLine("}");
//sb.AppendLine("tempFunction();");


var task01 = e.Frame.EvaluateScriptAsync("window.dmtrack_pageid");
task01.ContinueWith(t =>
{
	if (!t.IsFaulted)
	{
		var response = t.Result;
		if (response.Success == true)
		{
			if (response.Result != null)
			{
				string resultStr = response.Result.ToString();
				CookieHelper.dmtrack_pageid = resultStr;
			}
		}
	}
});                //var task01 = e.Frame.EvaluateScriptAsync("window.dmtrack_pageid");
task01.ContinueWith(t =>
{
	if (!t.IsFaulted)
	{
		var response = t.Result;
		if (response.Success == true)
		{
			if (response.Result != null)
			{
				string resultStr = response.Result.ToString();
				CookieHelper.dmtrack_pageid = resultStr;
			}
		}
	}
});