devxlogo

Set Two Items of a Property Grid from the Drop-down List

Set Two Items of a Property Grid from the Drop-down List

The MSDN-library does not contain a simple example demonstrating the picking-out item fromdrop-down list box for the property grid items. This sample demonstrates the techniquefor setting two items of a property grid from the drop-down list. These items have the type of string, but it must be simple to remake them for any other type.

Firstly, inherit the class from UITypeEditor:

	public class SelEditor : System.Drawing.Design.UITypeEditor	{        //this is a container for strings, which can be picked-out		ListBox Box1 = new ListBox();		IWindowsFormsEditorService edSvc;//this is a string array for drop-down list		public static string[] strList;		public SelEditor()		{			Box1.BorderStyle=BorderStyle.None;//add event handler for drop-down box when item will be selected			Box1.Click+=new EventHandler(Box1_Click);		}		public override System.Drawing.Design.UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context)		{			return UITypeEditorEditStyle.DropDown;		}		// Displays the UI for value selection.		public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, System.IServiceProvider provider, objectvalue)		{			Box1.Items.Clear();			Box1.Items.AddRange(strList);			Box1.Height=Box1.PreferredHeight;			// Uses the IWindowsFormsEditorService to display a 			// drop-down UI in the Properties window.			edSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));			if( edSvc != null )			{				edSvc.DropDownControl( Box1 );				return Box1.SelectedItem;			}			return value;		}		private void Box1_Click(object sender, EventArgs e)		{			edSvc.CloseDropDown();		}	}

Secondly, describe a property in the class, displayed in the property grid:

	public class Class1	{//These are string arrays for different drop-down list.		string[] Str1= {"AAA","BBB","CCC","DDDD"};		string[] Str2= {"WW","EEE"};		string s1,s2;		public Class1()		{			//			// TODO: Add constructor logic here			//		}		[EditorAttribute(typeof(SelEditor), typeof(System.Drawing.Design.UITypeEditor))]		public string STR_1		{			get{SelEditor.strList=Str1; return s1;}			set{s1=value;}		}				[EditorAttribute(typeof(SelEditor), typeof(System.Drawing.Design.UITypeEditor))]		public string STR_2		{			get{SelEditor.strList=Str2; return s2;}			set{s2=value;}		}	}
See also  Monetize TikTok For Your Business
devxblackblue

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist