c# - 创建新行并从小型 CSV 文件添加到数据表时出现 OOM 异常

Question

下面的代码登录到一个 https 网站，抓取一个 cookie，然后导航到另一个页面以下载一个 CSV 文件作为字符串。然后将该字符串拆分为一个数组，用于创建要添加到数据表的数据行。一切正常，直到 populateTable 方法中的循环抛出内存不足异常。 CSV 文件只有 206 KB，包含大约 500 行，包含拆分 CSV 字符串的数组包含 16,206 个字符串。在 Windows 7 中观察资源监视器，我可以看到该程序在崩溃前缓慢地将其 RAM 大小增加到 ~1.2 GB。

很遗憾，我无法共享网站 URL。

我并不是真的在寻求解决问题的帮助，而是想知道为什么会出现这种情况，因为 CSV 文件不是那么大。有什么意见吗？

namespace GetSCInfo
{

    public partial class Form1 : Form
{
    DataTable dt = new DataTable("clientInfo");
    public Form1()
    {
        InitializeComponent();
        createTable();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        DateTime today = DateTime.Today;
        //Starting date for the query. the 2f is required
        string startDate = "01%2f01%2f2005";
        string endDate = today.Month.ToString() + "%" + today.Day.ToString() + "%" + today.Year.ToString();

        //Check the date to make sure 2 digits are used for the month and day. If only one is used then add a 0.
        string[] dateFormat = endDate.Split('%');
        if (dateFormat[0].Length < 2)
            dateFormat[0] = "0" + dateFormat[0];
        if (dateFormat[1].Length < 2)
            dateFormat[1] = "0" + dateFormat[1];
        endDate = dateFormat[0] + "%2f" + dateFormat[1] + "%2f" + dateFormat[2];
        //Values for the form on the website
        using (var client = new CookieAwareWebClient())
        {
            var values = new NameValueCollection
        {
            {"eid", ""},
            {"EmailAddress", "example@example.com"},
            {"Password", "myPassword"},
            {"chk_NotificationOnly", "false"},
            {"btn_login", "Login"},
        };
            //Login and get the cookie
            client.UploadValues("https://Website/loginpage", values);

            // If the previous call succeeded we now have a valid authentication cookie
            // so we could download the protected page
            var val2 = new NameValueCollection
            {
                {"StartDate", startDate},
                {"EndDate", endDate},
                {"ReportFormat", "CSV"},
            };

  string bytes = client.DownloadString("https://website/csvPage?StartDate=" + startDate + "&EndDate=" + endDate + "&ReportFormat=CSV");

            client.Dispose();
            populateTable(bytes);


        }


    }

 private void createTable()
 {
     dt.Columns.Add("Assists ID", typeof(string));
     dt.Columns.Add("Last Name", typeof(string));
     dt.Columns.Add("First Name", typeof(string));

     dt.Columns.Add("S/C Name", typeof(string));
     dt.Columns.Add("S/C Phone", typeof(string));
     dt.Columns.Add("S/C Email", typeof(string));
 }

private void populateTable(string data)
 {
     dt.Clear();
     string[] csvValues = data.Split(',');
     data = "";
    for(int i = 19; i < csvValues.Length - 19; i=+19)
    {
        DataRow row = dt.NewRow();
        row[0] = csvValues[i];
        row[1] = csvValues[i + 1];
        row[2] = csvValues[i + 2];
        row[3] = csvValues[i + 14];
        row[4] = csvValues[i + 15];
        row[5] = csvValues[i + 16];
        dt.Rows.Add(row);
        //dt.Rows.Add(csvValues[i], csvValues[i+1], csvValues[i+2], csvValues[i+14], csvValues[i+15], csvValues[i+16]);
    }
    dataGridView1.DataSource = dt;


 }
}
//Extend the Webclient
public class CookieAwareWebClient : WebClient
{
    private readonly CookieContainer m_container = new CookieContainer();

    protected override WebRequest GetWebRequest(Uri address)
    {
        WebRequest request = base.GetWebRequest(address);
        HttpWebRequest webRequest = request as HttpWebRequest;
        if (webRequest != null)
        {
            webRequest.CookieContainer = m_container;
        }
        return request;
    }
}



}

Answer 1

你会踢自己的。在 populateTable 中，for 循环增量没有递增。您得到的是 i=+19 而不是 i+=19。您只是将 i 设置为 19 并一遍又一遍地创建一个新的 DataRow。