将 javascript 变量中的文本保存到 .txt 文件

Question

I am trying this code, but can't get it to work, it says "The name "text" does not exist in the current context"

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);
        }

How can I make variable "textt" accessible?

Here is a full code:

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);
        }
    }

Answer 1

You might be looking for ContinueWith() which can be chained after ExecuteJavaScriptAsync() .

In this example you need to use your JavaScript code as a function which returns anything (ex. textt). So I've created something like this:

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;
})();";

than I asynchronously evaluate it and catch the result which I am returning from that function:

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);
      }
   });

this is just a suggestion of how it might work.