为Silverlight 提供将Json解析为Geometry的方法

文章由LinuxBoy分享于2019-03-31 08:03:51热评（158）

为Silverlight 提供将Json解析为Geometry的方法

在做SOE开发的时候，我们往往返回的是一个集合对象的Json字符串，可是Silverlight中并没有为我们提供解析该字符串的方法，为此我自己写了一个，因为后台代码正在测试，所以将前端的Json格式解析为Silverlight中的Geometry对象如下，如有疑问，请跟我联系。

/// <summary>
/// 将返回的json解析为Geometry,不考虑坐标包含M和Z，如果考虑，请改动即可。将ArcObjects的Geometry转为json的代码我正在测试。
/// 作者：刘宇
/// 时间2012年
/// </summary>
/// <param name="jsonResponse"></param>
/// <returns></returns>

private ESRI.ArcGIS.Client.Geometry.Geometry ParsefromJson(string jsonResponse)
{

JsonObject jsonObject = JsonObject.Parse(jsonResponse.ToString()) as JsonObject;
SpatialReference pSpatial = new SpatialReference();
ESRI.ArcGIS.Client.Geometry.Geometry pGeo = null;

if (jsonObject.ContainsKey("geometries"))
{

JsonObject jsonObjectGeo = jsonObject["geometries"] as JsonObject;
//空间参考信息
if (jsonObjectGeo.ContainsKey("spatialReference"))
{
pSpatial = this.myMap.SpatialReference;

//JsonObject pSpatialJson =jsonObjectGeo["spatialReference"] as JsonObject;

// 根据需要添加
}
//点线面对象，不考虑hasz和hasM
if (jsonObjectGeo.ContainsKey("points"))
{
JsonValue JsonPoints = jsonObjectGeo["points"];

if (JsonPoints is JsonArray)
{
if (JsonPoints.Count == 1)
{
MapPoint pPoint = new MapPoint();

//去掉中括号

string[] pStrPoints = JsonPoints[0].ToString().Substring(1, JsonPoints[0].ToString().Length - 2).Split(',');

pPoint.X = Convert.ToDouble(pStrPoints[0]);
pPoint.Y = Convert.ToDouble(pStrPoints[1]);

pGeo = pPoint;

}

}
}
else if (jsonObjectGeo.ContainsKey("paths"))
{
JsonValue JsonPoints = jsonObjectGeo["paths"];

ESRI.ArcGIS.Client.Geometry.Polyline pPolyline = new ESRI.ArcGIS.Client.Geometry.Polyline();

ObservableCollection<ESRI.ArcGIS.Client.Geometry.PointCollection> pPointCollection = new ObservableCollection<ESRI.ArcGIS.Client.Geometry.PointCollection>();
// pPolyline.Paths

if (JsonPoints is JsonArray)
{
for (int i = 0; i < JsonPoints.Count; i++)
{
if (JsonPoints[i] is JsonArray)
{
ESRI.ArcGIS.Client.Geometry.PointCollection pPointCollections = new ESRI.ArcGIS.Client.Geometry.PointCollection();

JsonArray pInnerPoints = JsonPoints[i] as JsonArray;
for (int j = 0; j < pInnerPoints.Count; j++)
{
string pStr = pInnerPoints[j].ToString();

string[] pStrPoints = pInnerPoints[j].ToString().Substring(1, pInnerPoints[j].ToString().Length - 2).Split(',');
MapPoint pPoint = new MapPoint();
pPoint.X = Convert.ToDouble(pStrPoints[0]);
pPoint.Y = Convert.ToDouble(pStrPoints[1]);

pPointCollections.Add(pPoint);
}

pPointCollection.Add(pPointCollections);

}
}

pPolyline.Paths = pPointCollection;

pGeo = pPolyline;
}
}
else if (jsonObjectGeo.ContainsKey("rings"))
{
JsonValue JsonPoints = jsonObjectGeo["rings"];

ESRI.ArcGIS.Client.Geometry.Polygon pPolygon = new ESRI.ArcGIS.Client.Geometry.Polygon();

ObservableCollection<ESRI.ArcGIS.Client.Geometry.PointCollection> pPointCollection = new ObservableCollection<ESRI.ArcGIS.Client.Geometry.PointCollection>();

JsonArray pInnerPoints = JsonPoints[i] as JsonArray;
for (int j = 0; j < pInnerPoints.Count; j++)
{
string pStr = pInnerPoints[j].ToString();

pPointCollections.Add(pPoint);
}

pPointCollection.Add(pPointCollections);

}
}

pPolygon.Rings= pPointCollection;

pGeo = pPolygon;

}
}
}

pGeo.SpatialReference = pSpatial;

return pGeo;
}

为Silverlight 提供将Json解析为Geometry的方法