ImageLayer.RequestDataLoading Event

Occurs when a request data download has begun.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v20.1.dll

Declaration

public event EventHandler RequestDataLoading
Public Event RequestDataLoading As EventHandler

Event Data

The RequestDataLoading event's data class is EventArgs.

Examples

This example demonstrates how to monitor the service request state.

To do this, handle the ImageLayer.RequestDataLoading event. Specify the wait form which will be shown when data is loading. Handle the LayerBase.DataLoaded event to determine the state of the wait form after the map data is obtained.

using DevExpress.XtraMap;
using System;
using System.Windows.Forms;


namespace RequestDataLoadingExample {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e) {
            ImageLayer layer = new ImageLayer();
            mapControl1.Layers.Add(layer);
            BingMapDataProvider provider = new BingMapDataProvider();
            provider.BingKey = "YOUR_BING_KEY";
            layer.DataProvider = provider;
            layer.RequestDataLoading += OnRequestDataLoading;
            layer.DataLoaded += OnDataLoaded;
        }
        void OnRequestDataLoading(object sender, EventArgs e) {
            Cursor.Current = Cursors.WaitCursor;
            if (!splashScreenManager1.IsSplashFormVisible)
                splashScreenManager1.ShowWaitForm();
        }
        void OnDataLoaded(object sender, DataLoadedEventArgs e) {
            Cursor.Current = Cursors.Default;
            splashScreenManager1.CloseWaitForm();
        }

    }
}
See Also