0

我正在尝试此代码，但无法使其正常工作，它显示“名称“文本”在当前上下文中不存在”

CurBrowser.GetMainFrame().ExecuteJavaScriptAsync("for(var i = 0; i < elems1.length; i++){ var textt = elems1[i].innerText}");

        string docPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
        using (StreamWriter outputFile = new StreamWriter(Path.Combine(docPath, "WriteLines.txt"), true))
        {
            outputFile.WriteLine(textt);
        }

如何使变量“textt”可访问？

这是一个完整的代码：

private void button3_Click(object sender, EventArgs e)
    {
        CurBrowser.GetMainFrame().ExecuteJavaScriptAsync("var elems1 = document.getElementsByClassName('question-text')");
        CurBrowser.GetMainFrame().ExecuteJavaScriptAsync("for(var i = 0; i < elems1.length; i++){var textt = elems1[i].innerText}");
        

        string docPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
        using (StreamWriter outputFile = new StreamWriter(Path.Combine(docPath, "WriteLines.txt"), true))
        {
            outputFile.WriteLine(textt);
        }
    }
4

1 回答 1

1

您可能正在寻找ContinueWith()可以在ExecuteJavaScriptAsync().

在此示例中，您需要将 JavaScript 代码用作返回任何内容（例如 textt）的函数。所以我创造了这样的东西：

var myScript = @"(function () {
    var textt = "";
    var elems1 = document.getElementsByClassName('question-text');
    for(var i = 0; i < elems1.length; i++){
        textt += elems1[i].innerText
    }
    return textt;
})();";

比我异步评估它并捕获我从该函数返回的结果：

var result = await CurBrowser
   .GetMainFrame()
   .EvaluateScriptAsync(myScript)
   .ContinueWith(t => {
       var result = t.Result; // your textt
       string docPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
       using (StreamWriter outputFile = new StreamWriter(Path.Combine(docPath, "WriteLines.txt"), true)) {
            outputFile.WriteLine(result);
      }
   });

这只是一个关于它如何工作的建议。

于 2020-10-21T14:05:25.013 回答