namespace ExampleCodeSnippets

{

public class ReadXmlExample

{

/// <summary>

/// Creates an enumeration of <see cref="GeoAPI.Geometries.Coordinate"/>s from an xml string

/// </summary>

/// <param name="factory"></param>

/// <param name="xml">the xml string</param>

/// <returns>Coordinates</returns>

public static System.Collections.Generic.IEnumerable<GeoAPI.Geometries.IGeometry> PointsFromXml(

GeoAPI.Geometries.IGeometryFactory factory,

System.IO.Stream xml)

{

foreach (var coordinate in CoordinatesFromXml(xml))

yield return factory.CreatePoint(coordinate);

}

/// <summary>

/// Creates an enumeration of <see cref="GeoAPI.Geometries.Coordinate"/>s from an xml string

/// </summary>

/// <param name="xml">the xml string</param>

/// <returns>Coordinates</returns>

public static System.Collections.Generic.IEnumerable<GeoAPI.Geometries.Coordinate> CoordinatesFromXml(System.IO.Stream xml)

{

var reader = System.Xml.XmlReader.Create(xml);

var doc = System.Xml.Linq.XDocument.Load(reader);

if (doc.Root == null) yield break;

var ptsName = System.Xml.Linq.XName.Get("Points");

var ptName = System.Xml.Linq.XName.Get("Point");

var xName = System.Xml.Linq.XName.Get("X");

var yName = System.Xml.Linq.XName.Get("Y");

foreach (var ptsElement in doc.Root.Elements(ptsName))

{

foreach (var ptElement in ptsElement.Elements(ptName))

{

var element = ptElement.Element(xName);

if (element == null || element.IsEmpty) continue;

var x = double.Parse(element.Value,

System.Globalization.NumberFormatInfo.InvariantInfo);

element = ptElement.Element(yName);

if (element == null || element.IsEmpty) continue;

var y = double.Parse(element.Value,

System.Globalization.NumberFormatInfo.InvariantInfo);

yield return new GeoAPI.Geometries.Coordinate(x, y);

}

}

}

[NUnit.Framework.Test]

public void TestXml1()

{

var xml = @"<?xml version=""1.0"" encoding=""utf-8"" ?>

<root>

<Points>

<Point>

<X>13457786.5961983</X>

<Y>1629064.58490612</Y>

</Point>

</Points>

</root>";

var xmlFileName = System.IO.Path.ChangeExtension(System.IO.Path.GetTempFileName(), "xml");

using (var sw = new System.IO.StreamWriter(System.IO.File.OpenWrite(xmlFileName)))

sw.Write(xml);

var factory = new NetTopologySuite.Geometries.GeometryFactory();

SharpMap.Data.Providers.FeatureProvider p = null;

using (var fs = System.IO.File.OpenRead(xmlFileName))

{

p = new SharpMap.Data.Providers.FeatureProvider(PointsFromXml(factory, fs));

NUnit.Framework.Assert.IsNotNull(p);

NUnit.Framework.Assert.AreEqual(1, p.Features.Count);

}

System.IO.File.Delete(xmlFileName);

}

}

}