namespace SharpMap.Converters.GeoJSON

{

using System;

using System.Collections.Generic;

using SharpMap.Data;

/// <summary>

/// GeoJSON helper class

/// </summary>

public static class GeoJSONHelper

{

/// <summary>

/// Method to convert a <see cref="T:SharpMap.Data.FeatureDataSet"/> to a series of <see cref="GeoJSON"/> objects

/// </summary>

/// <param name="data">The feature dataset</param>

/// <returns>A series of <see cref="GeoJSON"/> objects</returns>

public static IEnumerable<GeoJSON> GetData(FeatureDataSet data)

{

if (data == null)

throw new ArgumentNullException("data");

using (data)

{

foreach (FeatureDataTable table in data.Tables)

{

var columns = table.Columns;

var keys = new string[columns.Count];

for (var i = 0; i < columns.Count; i++)

keys[i] = columns[i].ColumnName;

var rows = table.Rows;

for (int i = 0; i < rows.Count; i++)

{

var row = (FeatureDataRow)rows[i];

var geometry = row.Geometry;

var values = new Dictionary<string, object>();

for (var j = 0; j < keys.Length; j++)

values.Add(keys[j], row[j]);

yield return new GeoJSON(geometry, values);

}

}

}

}

}

}