我如何通过使用foreach循环一列和另一个foreach循环第二列来填充C#列表视图,这样第二个循环就不会先重写

本文关键字:循环 foreach 列表 视图 重写 填充 第二个 何通过 一列 二列 另一个 | 更新日期: 2023-09-27 18:28:50

我正在为两个注册表项提取url和url时间。并希望在列表视图中显示它。使用to循环,我如何将listview第一列一个循环一个循环地填充,因为url和时间都在不同的注册表项中。。。。。

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);

我如何通过使用foreach循环一列和另一个foreach循环第二列来填充C#列表视图,这样第二个循环就不会先重写

在剥离不相关的代码后,您将得到以下内容:

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);

此代码的表单不会向列表视图中插入列表项的集合,而是插入具有两个值的单个列表项。

第一个值在第一个循环中重复设置,第二个值在第二个循环中反复设置。您不断地覆盖同一个值,最后只剩下一对值。

你可以做的是:

//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);
}

与其构建新的ListViewItem,不如从一开始就构建它:

 ListViewItem item = new ListViewItem();

然后,如果你想设置第一列:

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

设置第二列:

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

然后,在最后,将ListViewItem添加到列表视图中:

 listViewCookies.Items.Add(item);

编辑,这里有一个修改后的例子:

   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);
    }