Creating a Time Zone drop down property

October 11th, 2013, 05:57 AM

Dunno if it's already been posted, but anyways here's what you can do to add a Time Zone property on your indy, using Linq and TypeConverters

1. Add System.Linq namespace

Code

using System.Linq;

2. Add TypeConverter class

Code

public class TZListConverter : TypeConverter
{
	public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
	{
		return true;
	}
	
	public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
	{
		return new StandardValuesCollection((TimeZoneInfo.GetSystemTimeZones()).Select(x=>x.DisplayName).ToList());
	}
}

3. Add a TimeZoneInfo element that will hold your selected Time Zone

Code

TimeZoneInfo tzi=TimeZoneInfo.Local;

4. Add your property

Code

[Description("Time Zone")]
[Category("User defined values")]
[Gui.Design.DisplayNameAttribute("Time Zone")]
[TypeConverter(typeof(TZListConverter))]
public string TZI
{
	get
	{
		return tzi.StandardName;
	}
	set
	{
		tzi = TimeZoneInfo.GetSystemTimeZones().FirstOrDefault<TimeZoneInfo>(x=>((x.DisplayName==value)||(x.StandardName==value)));
	}
}

5. Done

6. And it serializes correctly !

Creating a Time Zone drop down property

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Creating a Time Zone drop down property