Add a collection of a custom class to Settings.Settings

问题

I've been having a helluva time trying to add a custom collection of a custom class to the application settings of my winforms project I feel like Ive tried it about six different ways, including this way, this way, this way, and this way but nothing seems to work...

Currently the code complies, and runs fine - no exceptions anywhere. Code his the Save function but no entries are created in the settings xml file (I have a few other settings and it works for all of them but this one FYI). When it loads, Properties.Settings.Default.LastSearches is always null... Any thoughts?

Heres my current code:

The Classes:

[Serializable]
public class LastSearch : ISerializable
{
    public DateTime Date { get; set; }
    public string Hour { get; set; }
    public string Log { get; set; }
    public string Command { get; set; }
    public List<string> SelectedFilters { get; set; }
    public List<string> SearchTerms { get; set; }
    public List<string> HighlightedTerms { get; set; }
    public List<string> ExcludedTerms { get; set; }

    public LastSearch(DateTime date, string hour, string log, string command, List<string> selectedFilters,
        List<string> searchTerms, List<string> highlightedTerms, List<string> excludedTerms)
    {
        Date = date.ToUniversalTime();
        Hour = hour;
        Log = log;
        Command = command;
        SelectedFilters = selectedFilters;
        SearchTerms = searchTerms;
        HighlightedTerms = highlightedTerms;
        ExcludedTerms = excludedTerms;
    }

    protected LastSearch(SerializationInfo info, StreamingContext context)
    {
        Date = info.GetDateTime("Date");
        Hour = info.GetString("Hour");
        Log = info.GetString("Log");
        Command = info.GetString("Command");
        SelectedFilters = (List<string>)info.GetValue("SelectedFilters", typeof(List<string>));
        SearchTerms = (List<string>)info.GetValue("SearchTerms", typeof(List<string>));
        HighlightedTerms = (List<string>)info.GetValue("HighlightedTerms", typeof(List<string>));
        ExcludedTerms = (List<string>)info.GetValue("ExcludedTerms", typeof(List<string>));
    }
    [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter = true)]

    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        info.AddValue("Date", Date);
        info.AddValue("Hour", Hour);
        info.AddValue("Log", Log);
        info.AddValue("Command", Command);
        info.AddValue("SelectedFilters", SelectedFilters);
        info.AddValue("SearchTerms", SearchTerms);
        info.AddValue("HighlightedTerms", HighlightedTerms);
        info.AddValue("ExcludedTerms", ExcludedTerms);
    }
}

[Serializable]
public class LastSearchCollection : ISerializable
{
    public List<LastSearch> Searches { get; set; }

    public LastSearchCollection()
    {
        Searches = new List<LastSearch>();
    }

    public LastSearchCollection(SerializationInfo info, StreamingContext ctxt)
    {
        Searches = (List<LastSearch>)info.GetValue("LastSearches", typeof(List<LastSearch>));
    }
    [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter = true)]

    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {
        info.AddValue("Searches", Searches);
    }
}

Writing to Settings:

if (RecentQueriesToolStripMenuItem.DropDownItems.Count > 0)
{
    // Last Search Settings
    if (Properties.Settings.Default.LastSearches == null)
        Properties.Settings.Default.LastSearches = new LastSearchCollection();

    Properties.Settings.Default.LastSearches.Searches.Clear();
    foreach (LastSearchMenuItem item in RecentQueriesToolStripMenuItem.DropDownItems)
    {
        Properties.Settings.Default.LastSearches.Searches.Add(item.SearchData);
    }
}

// Save all settings
Properties.Settings.Default.Save();

Loading from setttings

// Last Searches
if (Properties.Settings.Default.LastSearches != null)
{
    int i = 0;
    foreach (LastSearch search in Properties.Settings.Default.LastSearches.Searches)
    {
        LastSearchMenuItem searchMenuItem = new LastSearchMenuItem(search);
        RecentQueriesToolStripMenuItem.DropDownItems.Add(searchMenuItem);
        RecentQueriesToolStripMenuItem.DropDownItems[i].Click += new EventHandler(RecentSearch_Click);
        i++;
    }
}

来源：https://stackoverflow.com/questions/7000625/add-a-collection-of-a-custom-class-to-settings-settings