System.ComponentModel.PropertyDescriptorCollection.this C# (CSharp) Method

        object IList.this[int index] {
            get {
                return this[index];
            }
            set {
                if (readOnly) {
                    throw new NotSupportedException();
                }

                if (index >= propCount) {
                    throw new IndexOutOfRangeException();
                }


                if (value != null && !(value is PropertyDescriptor)) {
                    throw new ArgumentException("value");
                }

                EnsurePropsOwned();
                properties[index] = (PropertyDescriptor)value;
            }
        }