C# で KML ファイルを操作または生成する

KML ファイル

Aspose.GIS を使用すると、Keyhole Markup Language (KML) ファイルからフィーチャを開いて読み取ることができます。

KML ファイルの作成

// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET
using (var layer = Drivers.Kml.CreateLayer(dataDir + "Kml_File_out.kml"))
{
    layer.Attributes.Add(new FeatureAttribute("string_data", AttributeDataType.String));
    layer.Attributes.Add(new FeatureAttribute("int_data", AttributeDataType.Integer));
    layer.Attributes.Add(new FeatureAttribute("bool_data", AttributeDataType.Boolean));
    layer.Attributes.Add(new FeatureAttribute("float_data", AttributeDataType.Double));

    Feature feature = layer.ConstructFeature();
    feature.SetValue("string_data", "string value");
    feature.SetValue("int_data", 10);
    feature.SetValue("bool_data", true);
    feature.SetValue("float_data", 3.14);
    feature.Geometry = new LineString(new[] { new Point(0, 0), new Point(1, 1) });

    layer.Add(feature);

    Feature feature2 = layer.ConstructFeature();
    feature2.SetValue("string_data", "string value2");
    feature2.SetValue("int_data", 100);
    feature2.SetValue("bool_data", false);
    feature2.SetValue("float_data", 3.1415);
    feature2.Geometry = Geometry.Null;

    layer.Add(feature2);
}

KML ファイルからフィーチャを読み取る

// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET
using (var layer = Drivers.Kml.OpenLayer(dataDir + "kml_file.kml"))
{
    // get feratures count
    int count = layer.Count;

    // get feature at index 1
    Feature featureAtIndex1 = layer[0];

    Console.WriteLine(featureAtIndex1.GetValue<string>("string_data"));

    Feature featureAtIndex2 = layer[1];

    Console.WriteLine(featureAtIndex2.GetValue<string>("string_data"));
}

無効な KML ファイルからフィーチャを読み取る

// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET
var path = dataDir + "kml_invalid_chars.kml";
using (var layer = Drivers.Kml.OpenLayer(path, new KmlOptions() { SymbolToReplaceInvalidChars = '_' } ))
{
    foreach (var feature in layer)
    {
        Console.WriteLine(feature.GetValue("name"));
        Console.WriteLine(feature.GetValue("description"));
    }
}

スタイル プロパティを KML にエクスポートする

// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET
using (var layer = Drivers.Kml.CreateLayer(dataDir + "Kml_Styles_out.kml"))
{
    var style = new KmlFeatureStyle
    {
        Line = new KmlLineStyle() { Width = 2.0 },
        Polygon = new KmlPolygonStyle() { Outline = false },
        Icon = new KmlIconStyle() { Resource = new KmlIconResource() { Href = "url" } },
        Label = new KmlLabelStyle() { Color = Color.Green },
        Balloon = new KmlBalloonStyle() { BackgroundColor = Color.Aqua, Text = "Example" },
        List = new KmlListStyle() { ItemType = KmlItemTypes.RadioFolder },
    };

    Feature feature = layer.ConstructFeature();
    feature.Geometry = new LineString(new[] { new Point(0, 0), new Point(1, 1) });
    layer.Add(feature, style);

    Feature feature2 = layer.ConstructFeature();
    feature2.Geometry = new Point(5, 5);

    layer.Add(feature2, style);
}