Microsoft Visual Studio Setup prerequisites, launch conditions and the .NET Target Framework 4 Client Profile

If you create a class like Setting<T>, you might think you can create a generic list, like:

List<Setting<T>> List = new List<Setting<T>>();

,but this is not possible in .Net 4.0. If you want objects of type Setting<int> mixed with objects of type  Setting<bool> in one List<T> you must define a none generic base class Setting, like:

    public class Setting
    {
        private string _name;
        public string Name
        {
            get
            {
                if (string.IsNullOrEmpty(_name)) { 

                   throw new ApplicationException("Property [Name] in class [Setting] is null or empty"); }
                return _name;
            }
            set { _name = value; }
        }
    }
    [Serializable]
    public class Setting<T> : Setting
    {
        private T _value;
        public T Value
        {
            get
            {
                return _value;
            }
            set
            {
                _value = value;
            }
        }
        public Type Type
        {
            get
            {
                return typeof(T);
            }
        }

        /// <summary>
        /// Define a default constructor for serialization purposes
        /// </summary>
        public Setting()
        {
        }
    }

Then you can mix generic types in the generic list like:

List<Setting> list = new List<Setting>
{
    new Setting<int>{Name = "Timeout", Value = 1000},
    new Setting<bool>{Name = "ImportEnabled", Value = true}
};

You can get an element of this list by using the method:

public T GetSetting<T>(string name, List<Setting> list)
{     T result;
    Setting<T> setting = (Setting<T>)Convert.ChangeType(                         list.Single(s => s.Name.Equals(name)), typeof(Setting<T>), null);
    result = setting.Value;

    return result;
}

To call the method use:

int timeout = GetSetting<int>("Timeout", list);

Tags: C#

If you want to get the week number of a date in C#, use the following function:

private int GetWeekNumber(DateTime date)
{
 return CultureInfo.CurrentCulture.Calendar.GetWeekOfYear(date, CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
}

 

Tags: C#