我如何通过使用foreach循环一列和另一个foreach填充第二列来填充C＃列表视图，以便第二个循环不会首先覆盖

Question

I am extracting url and url time for two registry key. And wants to show it in list view. Using to loops how can i fill listview first column by a loop an second by another because both url and time is in diffrent reg keys.....

listViewCookies.Columns.Add("TYPED URL", 300);

listViewCookies.Columns.Add("TIME", 400);

string[] url = new string[2];
ListViewItem item;

using (RegistryKey rk = Registry.Users.OpenSubKey(strSID + @"\Software\Microsoft\Internet Explorer\TypedURLs"))
{
  try
  {
    foreach (string u in rk.GetValueNames())
    {
       url[0] = rk.GetValue(u).ToString();
    }
  }
  catch { }
}

using (RegistryKey rk = Registry.Users.OpenSubKey(strSID + @"\Software\Microsoft\Internet Explorer\TypedURLsTime"))
{
  try
  {
    foreach (string u in rk.GetValueNames())
    {
      object val = rk.GetValue(u);
      DateTime output = DateTime.MinValue;
      if (val is byte[] && ((byte[])val).Length == 8)
      {
        byte[] bytes = (byte[])val;
        System.Runtime.InteropServices.ComTypes.FILETIME ft = new System.Runtime.InteropServices.ComTypes.FILETIME();
        int valLow = bytes[0] + 256 * (bytes[1] + 256 * (bytes[2] + 256 * bytes[3]));
        int valTwo = bytes[4] + 256 * (bytes[5] + 256 * (bytes[6] + 256 * bytes[7]));
        ft.dwLowDateTime = valLow;
        ft.dwHighDateTime = valTwo;
        DateTime UTC = DateTime.FromFileTimeUtc((((long)ft.dwHighDateTime) << 32) + ft.dwLowDateTime);
        TimeZoneInfo lcl = TimeZoneInfo.Local;
        TimeZoneInfo utc = TimeZoneInfo.Utc;
        output = TimeZoneInfo.ConvertTime(UTC, utc, lcl);
        url[1] = output.ToString();
      }
    }
  }
  catch { }
}

item = new ListViewItem(url);
listViewCookies.Items.Add(item);

Answer 1

After stripping the unrelated code you are left with something like:

string[] url = new string[2];

foreach (string u in someCollection)
{
   url[0] = someValue(u);
}

foreach (string u in someOtherCollection)
{
    url[1] = someOtherValue(u);
}

ListViewItem item = new ListViewItem(url);
listViewCookies.Items.Add(item);

The form of this code does not insert a collection of list items to a list view, instead it inserts a single list item with two values.

The first value is set repeatedly in the first loop, and the second in the second loop. You are constantly overwriting the same value, and at the end you are left with a single pair of values.

What you could do is something like:

//container for the first item of the pair
List<string> typedUrls = new List<string>(); 
foreach (string u in someCollection)
{
   typedUrls.Add(someValue(u));
}

//container for the second item of the pair
List<string> times = new List<string>(); 
foreach (string u in someOtherCollection)
{
    times.Add(someOtherValue(u));
}

//now loop the containers, and construct a string[] for each
//assuming that they have the exact same length
for (int i = 0; i < typedUrls.Count; i++)
{
    //create a string[]
    string[] stringItem = { typedUrls[i], times[i]};
    //construct a ListViewItem
    ListViewItem item = new ListViewItem(stringItem);
    //add it to the listView
    listViewCookies.Items.Add(item);
}

Answer 2

Instead of constructing a new ListViewItem you can construct it at the beginning:

 ListViewItem item = new ListViewItem();

Then if you want to set the first column:

 item.Text = "url ..." // Column 0 (Url)

To set the second column:

 item.SubItems.Add("time..."); // Column 1 (Time)

Then, at the end, add the ListViewItem to the list view:

 listViewCookies.Items.Add(item);

Edit, here's a modified example:

   listViewCookies.Columns.Add("TYPED URL", 300);
   listViewCookies.Columns.Add("TIME", 400);

        ListViewItem item = new ListViewItem();


        using (RegistryKey rk = Registry.Users.OpenSubKey(strSID + @"\Software\Microsoft\Internet Explorer\TypedURLs"))
        {
            try
            {
                foreach (string u in rk.GetValueNames())
                {

                    item.Text = rk.GetValue(u).ToString();


                }
            }
            catch { }
        }


        using (RegistryKey rk = Registry.Users.OpenSubKey(strSID + @"\Software\Microsoft\Internet Explorer\TypedURLsTime"))
        {
            try
            {
                foreach (string u in rk.GetValueNames())
                {

                    object val = rk.GetValue(u);

                    DateTime output = DateTime.MinValue;
                    if (val is byte[] && ((byte[])val).Length == 8)
                    {
                        byte[] bytes = (byte[])val;

                        System.Runtime.InteropServices.ComTypes.FILETIME ft = new System.Runtime.InteropServices.ComTypes.FILETIME();
                        int valLow = bytes[0] + 256 * (bytes[1] + 256 * (bytes[2] + 256 * bytes[3]));
                        int valTwo = bytes[4] + 256 * (bytes[5] + 256 * (bytes[6] + 256 * bytes[7]));
                        ft.dwLowDateTime = valLow;
                        ft.dwHighDateTime = valTwo;

                        DateTime UTC = DateTime.FromFileTimeUtc((((long)ft.dwHighDateTime) << 32) + ft.dwLowDateTime);
                        TimeZoneInfo lcl = TimeZoneInfo.Local;
                        TimeZoneInfo utc = TimeZoneInfo.Utc;
                        output = TimeZoneInfo.ConvertTime(UTC, utc, lcl);

                        item.SubItems.Add(output.ToString());

                    }
                }
            }

            catch { }
        }

        listViewCookies.Items.Add(item);

    }