System.Windows.Forms.TabControl.TabPageCollection.this C# (CSharp) Méthode

			public virtual TabPage this [string key] {
				get {
					if (string.IsNullOrEmpty (key))
						return null;

					int index = this.IndexOfKey (key);
					if (index < 0 || index >= this.Count)
						return null;
					
					return this[index];
				}
			}