private void ButtonLayerSettingImage_Click(Object sender, EventArgs e)
{

    //获得影像数据集earth
    DatasetImage dataset = (DatasetImage)datasource.Datasets["earth"];

    // 构造一个影像数据集设置对象
    LayerSettingImage layerSettingImage = new LayerSettingImage();
    // 设置影像图层设置对象的属性
    layerSettingImage.Brightness = 50;
    layerSettingImage.Contrast = 60;
    layerSettingImage.DisplayBandIndexes = new Int32[] { 2, 3, 1 };
    layerSettingImage.DisplayColorSpace = ColorSpaceType.RGB;
    layerSettingImage.OpaqueRate = 40;
    layerSettingImage.IsTransparent = true;
    layerSettingImage.TransparentColor = Color.Yellow;

    // 将影像数据集earth添加到地图中，并设置其风格
    map.Layers.Add(dataset, layerSettingImage, true);
    map.Refresh();

    // 将地图以image命名并保存至工作空间中
    String mapName = workspace.Maps.GetAvailableMapName("image");
    workspace.Maps.Add(mapName, map.ToXML());
    workspace.Save();

}