Экспорт или чтение ГИС-объектов, точек и геометрий из CSV в C#
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GIS C# Library Aspose.GIS позволяет читать объекты из файлов со значениями, разделенными запятыми (CSV).
Чтение объектов из CSV файла
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// 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(); | |
} | |
} |
Чтение точек из CSV файла
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// 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($"'{feature.Geometry.AsText()}: "); | |
Console.WriteLine(); | |
} | |
} |
Чтение геометрий с использованием столбца WKT
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// For complete examples and data files, please go to https://github.com/aspose-gis/Aspose.GIS-for-.NET | |
using (var layer = Drivers.Csv.OpenLayer(dataDir + "geometries.csv", | |
new CsvOptions() | |
{ | |
ColumnWkt = "geom_data" | |
})) | |
{ | |
// print geometry in wkt format | |
foreach (var feature in layer) | |
{ | |
Console.Write($"'{feature.Geometry.AsText()}: "); | |
Console.WriteLine(); | |
} | |
} |
Экспорт в формат CSV
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// 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); | |
} |