我想存储用户设置.它们是在运行时创建的,应在重新启动应用程序后读取.

private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
{
    var property = new SettingsProperty("Testname");
    property.DefaultValue = "TestValue";
    Settings.Default.Properties.Add(property);
    Settings.Default.Save();
}

此时,设置已存储,我可以访问它.

重新启动应用程序后,新创建的设置消失了：

public MainForm()
{
    InitializeComponent();

    foreach (SettingsProperty property in Settings.Default.Properties)
    {
          //Setting which was created on runtime before not existing
    }
}

尝试一下：Settings.Default.Reload();对结果没有任何影响.我还尝试了其他类似here的方法,但是它们都不适合我.

解决方法:

对您来说可能有点晚,但对其他人来说则分为两个部分.

>保存新的用户设置
>在启动时从userConfig.xml重新加载

我根据其他答案为ApplicationSettingsBase创建了此扩展

public static void Add<T>(this ApplicationSettingsBase settings, string propertyName, T val)
{           
    var p = new SettingsProperty(propertyName)
    {
        PropertyType = typeof(T),
        Provider = settings.Providers["LocalFileSettingsProvider"],
        SerializeAs = SettingsSerializeAs.Xml
    };

    p.Attributes.Add(typeof(UserScopedSettingAttribute), new UserScopedSettingAttribute());

    settings.Properties.Add(p);
    settings.Reload();

    //finally set value with new value if none was loaded from userConfig.xml
    var item = settings[propertyName];
    if (item == null)
    {
        settings[propertyName] = val;
        settings.Save();
    }
}

这将使Settings [“ MyKey”]起作用,但是当您重新启动设置时将不会加载该设置,但是userConfig.xml具有新值(如果调用了Settings.Save()).

重新加载的诀窍是再次执行添加,例如

if (settings.Properties.Cast<SettingsProperty>().All(s => s.Name != propertyName))
{
    settings.Add("MyKey", 0);
};

添加工作的方式是,仅当未从userConfig.xml加载任何值时,才将MyKey设置为0.