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A reference to System.Windows.Forms needs to be added in order to successfully build the code

below (right click the References folder of the project in the Solution Explorer | Add Reference... | Select System.Windows.Forms in Assemblies -> Framework).

using System.Collections;
using System.Drawing;
using System.Windows.Forms;
using DelftTools.Controls;
using DeltaShell.Plugins.CommonTools.Gui.Forms.Functions;
using SharpMap.Data.Providers;
using SharpMap.Layers;
using SharpMap.UI.Forms;

namespace DeltaShell.Plugins.VolumeModel.Views
{
    public partial class VolumeModelView : UserControl, IView
    {
        private Models.VolumeModel volumeModel;
        private readonly MapControl mapControl;
        private readonly FunctionView functionView;

        /// <summary>
        /// Creates a volume model view
        /// </summary>
        public VolumeModelView()
        {
            // Initialize the view (standard user control logic)
            InitializeComponent();

            // Create a map control
            mapControl = new MapControl { Dock = DockStyle.Fill };

            // Create a function view
            functionView = new FunctionView { Dock = DockStyle.Fill };

            // Create a split container which contains the map control and the function view
            var splitContainer = new SplitContainer
                {
                    Dock = DockStyle.Fill,
                    Orientation = Orientation.Horizontal,
                    Panel1 = { Controls = { mapControl } },
                    Panel2 = { Controls = { functionView } }
                };

            // Add the split container to the user control
            Controls.Add(splitContainer);
        }

        /// <summary>
        /// The volume data of the view
        /// </summary>
        public object Data
        {
            get { return volumeModel; }
            set
            {
                volumeModel = value as Models.VolumeModel;

                if (volumeModel == null)
                {
                    return; // Do nothing if the data is null or not a volume model
                }

                // Create a layer for the catchments in the basin
                var vectorLayer = new VectorLayer
                    {
                        LabelLayer = { Visible = true, LabelColumn = "Name" },
                        DataSource = new FeatureCollection
                        {
                            Features = (IList)volumeModel.Basin.Catchments
                        }
                    };

                // Ensure the map control is zoomed to extents after adding or removing features
                vectorLayer.DataSource.FeaturesChanged += (s, o) => mapControl.Map.ZoomToExtents();

                // Add the new layer to the map control
                mapControl.Map.Layers.Add(vectorLayer);

                // Add the precipitation time series to the function view
                functionView.Data = volumeModel.Precipitation;
            }
        }

        /// <summary>
        /// The image of the volume model view
        /// </summary>
        public Image Image { get; set; }

        /// <summary>
        /// The meta information of the volume model view (which is automatically set by Delta Shell logic)
        /// </summary>
        public ViewInfo ViewInfo { get; set; }

        /// <summary>
        /// Makes the provided <paramref name="item"/> visible (if implemented so)
        /// </summary>
        /// <remarks>Not part of this tutorial</remarks>
        public void EnsureVisible(object item)
        {

        }
    }
}