保存数据的一种方法是将其写入注册表，在 HKCU 节点下。这样，即使应用程序在同一台机器上，应用程序的不同用户也将拥有自己的设置。它还使文件系统更整洁，并且不需要数据库。但缺点是收藏夹只存在于机器上，不会随用户跨设备漫游。
实现这一点的一种方法是将表单设置包装在一个知道如何从注册表保存和加载值的类中。这与注册表帮助程序类一起，可以很容易地将“收藏夹”功能添加到您的表单中。
例如，您可以首先创建一个 Registry 帮助程序类，它将读取和写入 HKCU 节点的设置（因此这些设置特定于登录用户）：
public class RegHelper
{
private static readonly RegistryKey Root = Registry.CurrentUser
.CreateSubKey(@"Software\CompanyName\ApplicationName");
private readonly RegistryKey _thisKey = Root;
public RegHelper() { }
public RegHelper(string favoriteKey)
{
_thisKey = Root.CreateSubKey(favoriteKey);
}
public List<string> GetSubKeys()
{
return _thisKey.GetSubKeyNames().ToList();
}
public void SetProperty(string propertyName, string value)
{
_thisKey.SetValue(propertyName, value, RegistryValueKind.String);
}
public void SetProperty(string propertyName, bool value)
{
SetProperty(propertyName, value.ToString());
}
public string GetProperty(string propertyName)
{
return GetProperty(propertyName, string.Empty);
}
public string GetProperty(string propertyName, string defaultValue)
{
return _thisKey.GetValue(propertyName, defaultValue).ToString();
}
public bool GetPropertyAsBool(string propertyName)
{
return bool.Parse(GetProperty(propertyName, default(bool).ToString()));
}
}
然后，您可以将表单的字段包装到一个类中，该类不仅具有与表单字段匹配的属性，而且还具有将值保存到注册表的方法和一些静态方法来加载所有收藏夹或特定命名的最喜欢的。例如：
public class Favorite
{
public string Name { get; private set; }
public string Notes { get; set; }
public bool NotesFromPlanner { get; set; }
public string Project { get; set; }
public string DbLocation { get; set; }
public string AssesmentToolVersion { get; set; }
public string ProjectCodes { get; set; }
public bool StraightToNew { get; set; }
public Favorite(string name)
{
this.Name = name;
}
public void Save()
{
var reg = new RegHelper(this.Name);
reg.SetProperty("Name", Name);
reg.SetProperty("Notes", Notes);
reg.SetProperty("NotesFromPlanner", NotesFromPlanner);
reg.SetProperty("Project", Project);
reg.SetProperty("DbLocation", DbLocation);
reg.SetProperty("AssesmentToolVersion", AssesmentToolVersion);
reg.SetProperty("ProjectCodes", ProjectCodes);
reg.SetProperty("StraightToNew", StraightToNew);
}
public static Favorite GetFavorite(string favoriteName)
{
var reg = new RegHelper(favoriteName);
return new Favorite(favoriteName)
{
Notes = reg.GetProperty("Notes"),
NotesFromPlanner = reg.GetPropertyAsBool("NotesFromPlanner"),
Project = reg.GetProperty("Project"),
DbLocation = reg.GetProperty("DbLocation"),
AssesmentToolVersion = reg.GetProperty("AssesmentToolVersion"),
ProjectCodes = reg.GetProperty("ProjectCodes"),
StraightToNew = reg.GetPropertyAsBool("StraightToNew"),
};
}
public static List<Favorite> GetFavorites()
{
return new RegHelper().GetSubKeys().Select(GetFavorite).ToList();
}
public override string ToString()
{
return this.Name;
}
}
然后，您可以使用收藏夹类来填充您的收藏夹下拉：
private void Form1_Load(object sender, EventArgs e)
{
// Get all saved favorites and load them up in the combo box
foreach (var favorite in Favorite.GetFavorites())
{
cboFavorites.Items.Add(favorite);
}
}
现在，当从组合框中选择最喜欢的内容时，我们想用详细信息填充我们的表单：
private void cboFavorites_SelectedIndexChanged(object sender, EventArgs e)
{
var favorite = (Favorite) cboFavorites.SelectedItem;
txtNotes.Text = favorite.Notes;
txtAssetToolVersion.Text = favorite.AssesmentToolVersion;
txtDbLocation.Text = favorite.DbLocation;
chkNotesFromPlanner.Checked = favorite.NotesFromPlanner;
txtProjectCodes.Text = favorite.ProjectCodes;
cboProjects.Text = favorite.Project;
chkStraightToNew.Checked = favorite.StraightToNew;
}
当有人点击“保存收藏”时，我们希望将收藏的详细信息添加（或更新）到注册表中：
private void btnAddFavorite_Click(object sender, EventArgs e)
{
string favoriteName = cboFavorites.Text;
if (string.IsNullOrEmpty(favoriteName))
{
MessageBox.Show("Please type a name for the favorite in the Favorites box.");
return;
}
var favorite = new Favorite(favoriteName)
{
Notes = txtNotes.Text,
AssesmentToolVersion = txtAssetToolVersion.Text,
DbLocation = txtDbLocation.Text,
NotesFromPlanner = chkNotesFromPlanner.Checked,
ProjectCodes = txtProjectCodes.Text,
Project = cboProjects.Text,
StraightToNew = chkStraightToNew.Checked
};
favorite.Save();
// When saving a favorite, add it to the combo box
// (remove the old one first if it already existed)
var existingFav = cboFavorites.Items.Cast<Favorite>()
.FirstOrDefault(fav => fav.Name == favoriteName);
if (existingFav != null)
{
cboFavorites.Items.Remove(existingFav);
}
cboFavorites.Items.Add(favorite);
cboFavorites.Text = favoriteName;
}
这应该足以让你开始，如果你想去注册路线。