Esportare o leggere funzionalità GIS, punti e geometrie da CSV in C#

La libreria GIS C# Aspose.GIS consente di leggere le funzionalità dai file con valori separati da virgola (CSV).

Lettura delle funzionalità da un file CSV

// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET
using (var layer = Drivers.Csv.OpenLayer(dataDir + "sample.csv"))
{
    // print attributes
    foreach (var attribute in layer.Attributes)
    {
        Console.Write($"'{attribute.Name}' ");
    }
    Console.WriteLine();

    // print records
    foreach (var feature in layer)
    {
        var dump = feature.GetValuesDump();
        foreach (var item in dump)
        {
            Console.Write($"'{item}' ");
        }
        Console.WriteLine();
    }
}

Lettura dei punti da un file CSV

// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET
using (var layer = Drivers.Csv.OpenLayer(dataDir + "geometries.csv",
    new CsvOptions()
    {
        ColumnX = "x" , 
        ColumnY = "y",
        ColumnZ = "z",
        ColumnM = "m"
    }))
{
    // print geometry in wkt format
    foreach (var feature in layer)
    {
        Console.Write($"'{feature.Geometry.AsText()}: ");
        Console.WriteLine();
    }
}

Lettura delle geometrie utilizzando la colonna WKT

// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET
using (var layer = Drivers.Csv.OpenLayer(dataDir + "geometries.csv",
    new CsvOptions()
    {
        ColumnWkt = "geom_data"
    }))
{
    // print geometry in wkt format
    foreach (var feature in layer)
    {
        Console.Write($"'{feature.Geometry.AsText()}: ");
        Console.WriteLine();
    }
}

Esportazione in formato CSV

// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET
            
// apply a custom delimiter and a column for geometry.
var options = new CsvOptions()
{
    ColumnWkt = "geom_data", 
    Delimiter = ';'
};

// create a new CSV layer
using (var layer = Drivers.Csv.CreateLayer(dataDir + "csv_out.csv", options))
{
    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);
}