C# login into website and Download multiple files

Mark Tweedy 1

I am trying to create a program mainly WF or WPF. So What I am trying to do is create or automate a why from me to login into website and downloads files. Now the trick part is to download files by a certain column values, because status changes are the ones I want to download?

So What I want to is Create C# Program

Then have it check for values if those values are true then download file or Files?

When downloads the files I need download types that work with two different software types that I use?

Mark Tweedy 1 Reputation point

2023-05-12T18:58:47.92+00:00

Or a good jumping off point to start.

2 answers

Bruce (SqlWork.com) 57,241

This is standard screen scraping. C# is not the most popular language for this, but you can. You need an html parsing library. You will need to reverse engineer the login using network trace. The browsers tools will work for this. Postman Is also a handy tool. Generally you will need to harvest the cookie from the login. Often the login will use anti forgery software, you you will need to handle this.

Mark Tweedy 1 Reputation point

2023-05-12T21:30:57.72+00:00

Can have a example code ?

Hui Liu-MSFT 40,786 Microsoft Vendor

Hi,@Mark Tweedy. Welcome Microsoft Q&A. For the problem of logging in to the website and downloading files if the condition is true, you could try to refer to the following example code to see if it helps you.

<Grid>
        <Button x:Name="btn" Content="login" Click="btn_Click" Width="100" Height="50"/>

    </Grid>

Codebedhind:

 public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private async  void btn_Click(object sender, RoutedEventArgs e)
        {
            await F();


        }
         async Task F()
        {
            string username = "your_username";
            string password = "your_password";

            HttpClient client = new HttpClient();

            var loginData = new FormUrlEncodedContent(new[]
            {
            new KeyValuePair<string, string>("username", username),
            new KeyValuePair<string, string>("password", password)
        });

            HttpResponseMessage loginResponse = await client.PostAsync("https://example.com/login", loginData);

            if (loginResponse.IsSuccessStatusCode)
            {
                HttpResponseMessage pageResponse = await client.GetAsync("https://example.com/data");
                string pageContent = await pageResponse.Content.ReadAsStringAsync();

                bool conditionsMet = PerformValueChecks(pageContent);

                if (conditionsMet)
                {
                    await DownloadFiles(client);
                }
            }
        }
        public  bool flag;
         bool PerformValueChecks(string pageContent)
        {

            if (flag==true)
            {
                return true;
            }
            return false;
        }

        static async Task DownloadFiles(HttpClient client)
        {
           
            HttpResponseMessage fileResponse = await client.GetAsync("https://example.com/file1");
            await SaveFile(fileResponse, "path_to_save_file1");


        }

        static async Task SaveFile(HttpResponseMessage response, string filePath)
        {
            
            using (Stream fileStream = await response.Content.ReadAsStreamAsync())
            using (FileStream outputStream = File.Create(filePath))
            {
                await fileStream.CopyToAsync(outputStream);
            }
        }
    }

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