如何分配一个变量等待CEFSHARP C＃中的空隙方法中的变量

Question

这就是我所拥有的：

private async void Button_Click(object sender, EventArgs e)
{
   string jsScript1 = "some java script code";
   await Task.WhenAll(chrome.WaitForLoadAsync(), chrome.EvaluateScriptAsync(jsScript1));

   string jsScript2 = "some java script code";
   await Task.WhenAll(chrome.WaitForLoadAsync(), chrome.EvaluateScriptAsync(jsScript2));

   string jsScript3 = "some java script code";
   await Task.WhenAll(chrome.WaitForLoadAsync(), chrome.EvaluateScriptAsync(jsScript3));
}

如果我想返回结果并处理结果，如何分配变量等待？

我想完成的工作，

private async void Button_Click(object sender, EventArgs e)
{
   ...
   ...
   ...
    
   string jsScript4 = "some java script code";
   var task = await Task.WhenAll(chrome.WaitForLoadAsync(), 
   chrome.EvaluateScriptAsync(jsScript4));
   task.ContinueWith(x =>
   {
     if (!x.IsFaulted)
     {
       var response = x.Result;
        if (response.Success == true)
        {
          var final = (List<object>)response.Result;
          foreach (var el in final)
          {
            textHtml.Text += el.ToString() + Environment.NewLine;
          }
        }
     }
   }, TaskScheduler.FromCurrentSynchronizationContext());
}

但是我会遇到错误“不能将空白分配给隐式型变量”，

该如何解决这个问题？

---

通过使用螺纹。sleep

string jsScript1 = "some java script code";
            await Task.WhenAll(chrome.WaitForLoadAsync(), chrome.EvaluateScriptAsync(jsScript1));

            string jsScript2 = "some java script code";
            await Task.WhenAll(chrome.WaitForLoadAsync(), chrome.EvaluateScriptAsync(jsScript2));

            string jsScript3 = "some java script code";
            await Task.WhenAll(chrome.EvaluateScriptAsync(jsScript3));


//Its important to delete "chrome.WaitForLoadAsync()" look above!
            Thread.Sleep(2000); 
            string jsScript4 = "some java script code";
            var navigationTask = chrome.WaitForLoadAsync();
            var evaluateTask = chrome.EvaluateScriptAsync(jsScript4);
            await Task.WhenAll(navigationTask, evaluateTask, evaluateTask.ContinueWith(x =>
            {
                if (!x.IsFaulted)
                {
                    var response = x.Result;
                    if (response.Success == true)
                    {
                        var final = (List<object>)response.Result;
                        foreach (var el in final)
                        {
                            textHtml.Text += el.ToString() + Environment.NewLine;
                        }
                    }
                }
            }, TaskScheduler.FromCurrentSynchronizationContext()));

如何在不使用thread.sleep的情况下重写此代码的解决方案？ 我正在使用chrome.waitforloadasync（） aka“导航任务”，但这与jsscript4一致，这也许是因为jsscript3 单击链接上的单击使用负载链接，那里没有导航，但是当前页面上的加载链接，也许我需要类似chrome.waitforloadasync（） for Load Links/load class类

Answer 1

您只需将任务存储为变量，然后在等待任务后访问其结果属性。

var navigationTask = browser.WaitForLoadAsync();
var evaluateTask = browser.EvaluateScriptAsync(script);

await Task.WhenAll(navigationTask, evaluateTask);

var response = evaluateTask.Result;

Answer 2

的结果等待任务。Whenall（...）是无效的，因此您应该等待其他东西 :)

   string jsScript4 = "some java script code";

   var valueTask = chrome.EvaluateScriptAsync(jsScript4);

   var waitTask = Task.WhenAll(
       chrome.WaitForLoadAsync(),
       valueTask);

   await waitTask.ContinueWith(waitTask =>
   {
     if (!waitTask.IsFaulted)
     {
       var response = valueTask.Result;
        if (response.Success == true)
        {
          var final = (List<object>)response.Result;
          foreach (var el in final)
          {
            textHtml.Text += el.ToString() + Environment.NewLine;
          }
        }
     }
   }, TaskScheduler.FromCurrentSynchronizationContext());