使用ProjNet.Silverlight可以将ArcGis中的从标由大地座标转换为经纬座标，代码如下
public List<MapPoint> ConvertTo(List<MapPoint> mps)
{
CoordinateTransformationFactory ctfac = new CoordinateTransformationFactory();
Point p = new Point(108.94,34.28);
string bj1954Lcc = "PROJCS[\"China_LAmbert_Conformal_Conic\",GEOGCS[\"GCS_Beijing_1954\",DATUM[\"D_Beijing_1954\",SPHEROID[\"Krasovsky_1940\",6378245.0,298.3]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"LAmbert_Conformal_Conic\"],ParaMETER[\"False_Easting\",ParaMETER[\"False_northing\",ParaMETER[\"Central_Meridian\",105.0],ParaMETER[\"Standard_Parallel_1\",30.0],ParaMETER[\"Standard_Parallel_2\",62.0],ParaMETER[\"Latitude_Of_Origin\",UNIT[\"Meter\",1.0]]";
IProjectedCoordinateSystem fromCS = CoordinateSystemWktReader.Parse(bj1954Lcc) as IProjectedCoordinateSystem;
GeographicCoordinateSystem toCS = (GeographicCoordinateSystem)fromCS.GeographicCoordinateSystem;
List<MapPoint> list = new List<MapPoint>();
foreach (var mp in mps)
{
var p1 = new Point(mp.X,mp.Y);
var p2 = ctfac.CreateFromCoordinateSystems(fromCS,toCS).MathTransform.Transform(p1);
list.Add(new MapPoint(p2.X,p2.Y));
}
return list;
}
下载ProjNet.Silverlight后在Silverlight中使用是会出一个'p' is not recognized.的错误,找了半天没有解决，最后反编译代码然后跟踪发现原来有一个字符处理时使用的是Encoding是Unicode,在中文的C#中字符串的默认编码是UTF-8,将代码中的Unicode改为UTF-8即可！
需要改的代码在:ProjNet.Converters.WellKNownText.IO.StreamTokenizer类中的
private TokenType NextTokenAny()中!
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