C# function execute javascript function in web page using webclient

Question

我需要一些代碼方面的幫助。 我有以下代碼，它非常有效地允許我以編程方式登錄到供應商的網站，然后從中為我們的數據庫抓取圖像。 這很好用。 問題是我還需要獲取最新數據 - 這是頁面上的導出按鈕（導出到 excel）。 使用 F12 和提琴手我可以看到它調用了 java 腳本 function。 我的知識在網上有點有限 - 我讀到客戶端可能不是 go 調用 javascript 但 webbrowser 的方式？ （我是一名集成專家，所以 SQL、SSIS、邏輯應用程序或 c# 中的基本編碼更適合我）。 If I need to change to web browser how do I persist cookies from login etc. I'm coding this in azure function http trigger that will be used in logic apps flow.

public class WebClientEx : WebClient
{
    public CookieContainer CookieContainer { get; private set; }

    public WebClientEx()
    {
        CookieContainer = new CookieContainer();
    }

    protected override WebRequest GetWebRequest(Uri address)
    {
        var request = base.GetWebRequest(address);
        if (request is HttpWebRequest)
        {
            (request as HttpWebRequest).CookieContainer = CookieContainer;
        }
        return request;
    }
}

static string GetSourceForMyShowsPage(string JobId)
        {
            var sqlinsert = new SQLInsert();

            using (var client = new WebClientEx())
            {
                var values = new NameValueCollection
            {
                { "UserName", "sss" },
                { "Password", "sss" },
            };
                // Authenticate
                client.UploadValues("url/Login", values);

                //get the image url that we need to get the image in bytes - we might need to change this to a byte method?
                string responseMessage = client.DownloadString("myurl" + JobId);
                string imageurl = "";
                byte[] imageBytes;

                //search for images in string
                HtmlDocument document = new HtmlDocument();
                document.LoadHtml(responseMessage);
                document.DocumentNode.Descendants("img")
                          .Where(e =>
                          {
                              string src = e.GetAttributeValue("src", null) ?? "";
                              return !string.IsNullOrEmpty(src) && src.StartsWith(@"/Photo");
                          })
                          .ToList()
                          .ForEach(x =>
                          {
                              imageurl = x.GetAttributeValue("src", null);

                              imageurl = imageurl.Substring(0, imageurl.IndexOf("width") - 1);
                              imageurl = imageurl.Replace("amp;", "");
                              imageurl = imageurl.Replace("&amp", "");
                              imageurl = "url/" + imageurl;

                              imageBytes = client.DownloadData(imageurl);

                              string base64image = Convert.ToBase64String(imageBytes);

                              //upload data to sql table
                              sqlinsert.executeInsert(JobId, base64image);
                          });


                // Download desired page
                return client.DownloadString("url" + JobId);
            }
        }

javascript function 被稱為：

function onExportClicked() {
        var data = ST.Util.serialiseForm($('#shared-tag-search-form'));
        var url = '/Reports/SharedTag';
        var form = $('<form method="POST" action="' + url + '">');
        data.push({ name: 'type', value: 'ExportToXls' });
        $.each(data, function (k, v) {
            form.append($('<input type="hidden" name="' + v.name + '" value="' + v.value + '">'));
        });
        $('body').append(form);
        form.submit();
    }

  

Answer 1

感謝分散。 我正在使用客戶端的上傳值並調用 api，然后使用寫入所有字節獲取數據。

 client.BaseAddress = "url/";
            var url = "Reports/SharedTag";
            client.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36");
            client.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
            
            var formdata = new NameValueCollection
            {
                { "Search.Reported.StartDate", "27/07/2022" },
                { "type", "ExportToXls" },
            };

            byte[] result = client.UploadValues(url, "POST", formdata);
            File.WriteAllBytes(@"C:\Temp\Excel.xls", result);