WinForms Property Grid - Use a custom cell editor

This example demonstrates how to implement a UI Type Editor (FilteredFileNameEditor) and use it within the PropertyGridControl.

1. Create a FilteredFileNameEditor class and implement the UITypeEditor interface:

   internal class FilteredFileNameEditor : UITypeEditor {
       private OpenFileDialog ofd = new OpenFileDialog();
       public override UITypeEditorEditStyle GetEditStyle(
        ITypeDescriptorContext context) {
           return UITypeEditorEditStyle.Modal;
       }
       public override object EditValue(
        ITypeDescriptorContext context,
        IServiceProvider provider,
        object value) {
           ofd.FileName = value.ToString();
           ofd.Filter = "Text File|*.txt|All Files|*.*";
           if (ofd.ShowDialog() == DialogResult.OK) {
               return ofd.FileName;
           }
           return base.EditValue(context, provider, value);
       }
   }

2. Apply the System.ComponentModel.Editor attribute as follows:

   public class File {
       [System.ComponentModel.Editor(typeof(UIEditors.FilteredFileNameEditor),
         typeof(System.Drawing.Design.UITypeEditor))]
       public string Path { get; set; }
       public string Path2 { get; set; }
   }

3. Assign a ButtonEdit to a cell as shown in the Assigning Editors to Editor Rows topic.

   private void Form1_Shown(object sender, EventArgs e) {
       RepositoryItemButtonEdit edit = new RepositoryItemButtonEdit();
       edit.ButtonClick += edit_ButtonClick;
       (this.propertyGridControl1.Rows[0] as CategoryRow).ChildRows["rowPath2"].Properties.RowEdit = edit;
   }

4. Handle the Button Editor's ButtonClick event.

   void edit_ButtonClick(object sender, DevExpress.XtraEditors.Controls.ButtonPressedEventArgs e) {
       this.openFileDialog1.ShowDialog();
   }

Files to Review

• File.cs (VB: File.vb)
• Form1.cs (VB: Form1.vb)
• FilteredFileNameEditor.cs (VB: FilteredFileNameEditor.vb)

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