C# 从SQL Server地理数据类型在Google地图上显示多边形
我有一个SQL Server 2008数据库，其中包含一列类型为geography的数据，用于存储澳大利亚各个地区的形状。我希望能够在谷歌地图上绘制这些形状 这是一个ASP.NET C网站 我已经搜索了如何进行此操作的任何示例，但找不到任何内容C# 从SQL Server地理数据类型在Google地图上显示多边形,c#,google-maps,C#,Google Maps,我有一个SQL Server 2008数据库，其中包含一列类型为geography的数据，用于存储澳大利亚各个地区的形状。我希望能够在谷歌地图上绘制这些形状 这是一个ASP.NET C网站 我已经搜索了如何进行此操作的任何示例，但找不到任何内容 有没有人有一些示例可以说明如何做到这一点，特别是使用SQL Server中的地理数据？我过去曾使用KML文件在网页上覆盖多边形 我建议读谷歌 创建一个从数据库中读取的函数 创建KML文件 从googleapi调用KML文件 虽然KML为您提供了一种快速简
有没有人有一些示例可以说明如何做到这一点，特别是使用SQL Server中的地理数据？我过去曾使用KML文件在网页上覆盖多边形 我建议读谷歌 创建一个从数据库中读取的函数 创建KML文件 从googleapi调用KML文件 虽然KML为您提供了一种快速简便的方式来覆盖形状，但谷歌确实对显示的项目数量进行了限制 下面的内容应该可以帮助您开始使用KML方法
public ActionResult Kml()
{
DataAccess da = new DataAccess();
string cellColor = "0032FB";
string kml = @"<?xml version=""1.0"" encoding=""UTF-8""?>
<kml xmlns=""http://earth.google.com/kml/2.1"">
<Document>
<Style id="polygon">
<LineStyle>
<color>FF" + cellColor + @"</color>
</LineStyle>
<PolyStyle>
<color>44" + cellColor +@"</color>
<fill>1</fill>
<outline>1</outline>
</PolyStyle>
</Style>
<name>some name</name>
<description>some des</description>
";
DataTable polygons;
foreach (DataRow polygon in polygons.Rows)
{
kml += @"
<Placemark>
<name>"somename @"</name>
<description><![CDATA[<p>some text</p>]]></description>" +
@"<styleUrl>#polygon</styleUrl>
<Polygon>
<extrude>1</extrude>
<altitudeMode>clampToSeaFloor</altitudeMode>
<outerBoundaryIs>
<LinearRing>
<coordinates>" +
polygon["Cell Limit Longitude West"].ToString() + "," + polygon["Cell Limit Latitude North"].ToString() + " " +
polygon["Cell Limit Longitude East"].ToString() + "," + polygon["Cell Limit Latitude North"].ToString() + " " +
polygon["Cell Limit Longitude East"].ToString() + "," + polygon["Cell Limit Latitude South "].ToString() + " " +
polygon["Cell Limit Longitude West"].ToString() + "," + polygon["Cell Limit Latitude South "].ToString() + " " +
polygon["Cell Limit Longitude West"].ToString() + "," + polygon["Cell Limit Latitude North"].ToString() + " " +
@"</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</Placemark>
";
}
kml += @"</Document>
</kml>";
byte[] data = Encoding.ASCII.GetBytes(kml);
return File(data, "application/vnd.google-earth.kml+xml", id);
}
你也可以看看。然而，你必须上传你的数据到谷歌。此外，谷歌集团提供的数据。但是您需要SQL，因此此选项可能对您不可用。来自AdamW的答案是正确的，但是没有解决SqlGeography数据格式中的数据 包括对Microsoft.SqlServer.Types的引用
SqlCommand cmd = new SqlCommand("SELECT STATEMENT",ConnectionString);
connectionString.Open();
SqlDataReader polygon = cmd.ExecuteReader();
While (polygon.read())
{
string kmlCoordinates = string.Empty;
SqlGeography geo = (SqlGeography)polygon["GeoColumn"];
for(int i = 1; i <= geo.STNumPoints(); i++)
{
SqlGeography point = geo.STPointN(i);
kmlCoordinates += point.Long + "," + point.Lat + " ";
}
{
ConnectionString.Close();
public void KmlExport()
{
string cellColor = "COLOR";
string KMLname = "KML NAME";
string description = "KML DESCRIPTION";
string kml = @"<?xml version=""1.0"" encoding=""UTF-8""?>
<kml xmlns=""http://www.opengis.net/kml/2.2"">
<Document>
<Style id=""polygon"">
<LineStyle>
<color>FF" + cellColor + @"</color>
</LineStyle>
<PolyStyle>
<color>44" + cellColor + @"</color>
<fill>1</fill>
<outline>1</outline>
</PolyStyle>
</Style>
<name>" + KMLname + @"</name>
<description>" + description + "</description>";
SqlCommand cmd = new SqlCommand("Select Statement", connectionString);
cs.Open();
SqlDataReader polygon = cmd.ExecuteReader();
while (polygon.Read())
{
string kmlCoordinates = string.Empty;
SqlGeography geo = (SqlGeography)polygon["GEOGRAPHY COLUMN"];
for (int i = 1; i <= geo.STNumPoints(); i++)
{
SqlGeography point = geo.STPointN(i);
kmlCoordinates += point.Long + "," + point.Lat + " ";
}
string polyName = polygon["Name Column"].ToString();
string polyDescription = polygon["Description Column"].ToString();
kml += @"
<Placemark>
<name>" + polyName + @"</name>
<description><![CDATA[<p>" + polyDescription + "</p>]]></description>" +
@"<styleUrl>#polygon</styleUrl>
<Polygon>
<extrude>1</extrude>
<altitudeMode>clampToSeaFloor</altitudeMode>
<outerBoundaryIs>
<LinearRing>
<coordinates>" + kmlCoordinates +
@"</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</Placemark>";
kmlCoordinates = string.Empty;
}
cs.Close();
kml += @"</Document></kml>";
StreamWriter file = new StreamWriter(@"OUTPUTFILE.KML");
file.WriteLine(kml);
file.Close();
这是Adam W和Blair M的解决方案的组合。我修改了它，以便在数据库中有多个多边形时生成KML文件 我意识到这有点吹毛求疵——但你应该说明在这些答案中正确使用语句。特别是在这个用例中，我觉得不正确地处理对象可能会导致一些严重的内存泄漏。
public void KmlExport()
{
string cellColor = "COLOR";
string KMLname = "KML NAME";
string description = "KML DESCRIPTION";
string kml = @"<?xml version=""1.0"" encoding=""UTF-8""?>
<kml xmlns=""http://www.opengis.net/kml/2.2"">
<Document>
<Style id=""polygon"">
<LineStyle>
<color>FF" + cellColor + @"</color>
</LineStyle>
<PolyStyle>
<color>44" + cellColor + @"</color>
<fill>1</fill>
<outline>1</outline>
</PolyStyle>
</Style>
<name>" + KMLname + @"</name>
<description>" + description + "</description>";
SqlCommand cmd = new SqlCommand("Select Statement", connectionString);
cs.Open();
SqlDataReader polygon = cmd.ExecuteReader();
while (polygon.Read())
{
string kmlCoordinates = string.Empty;
SqlGeography geo = (SqlGeography)polygon["GEOGRAPHY COLUMN"];
for (int i = 1; i <= geo.STNumPoints(); i++)
{
SqlGeography point = geo.STPointN(i);
kmlCoordinates += point.Long + "," + point.Lat + " ";
}
string polyName = polygon["Name Column"].ToString();
string polyDescription = polygon["Description Column"].ToString();
kml += @"
<Placemark>
<name>" + polyName + @"</name>
<description><![CDATA[<p>" + polyDescription + "</p>]]></description>" +
@"<styleUrl>#polygon</styleUrl>
<Polygon>
<extrude>1</extrude>
<altitudeMode>clampToSeaFloor</altitudeMode>
<outerBoundaryIs>
<LinearRing>
<coordinates>" + kmlCoordinates +
@"</coordinates>
</LinearRing>
</outerBoundaryIs>
</Polygon>
</Placemark>";
kmlCoordinates = string.Empty;
}
cs.Close();
kml += @"</Document></kml>";
StreamWriter file = new StreamWriter(@"OUTPUTFILE.KML");
file.WriteLine(kml);
file.Close();