ArcGIS API for Silverlight调用GP生成等值线输入要素集FeatureSet

已经建立好GP模型，模拟可以生成等值线，现在在Silverlight客户端调用该GP工具时，提供模型输入参数要素集FeatureSet，但是输入参数中的Fields始终为null值，最终导致模型调用失败，无任何输出。

主要代码如下：

private FeatureSet featureSet;//作为GP输入参数的要素集

public MainPage2()

{

InitializeComponent();

getXQYJInfoSoapClient client = new getXQYJInfoSoapClient();

client.GetAllSHRainCompleted += new EventHandler<GetAllSHRainCompletedEventArgs>(client_GetAllSHRainCompleted);

client.GetAllSHRainAsync();

}

void client_GetAllSHRainCompleted(object sender, GetAllSHRainCompletedEventArgs e)

{

//获取到所有的山洪雨量点

ObservableCollection<RainFall> lists = e.Result;

int PointsNum = lists.Count;//点的个数

evaluatePoints = new EvaluationPointStruct[PointsNum];

int index = 0;

foreach (RainFall item in lists)

{

evaluatePoints[index].Latitute = item.Latitute;

evaluatePoints[index].Longitute = item.Longitute;

evaluatePoints[index].YL = item.YL24;

index++;

}

Utility.AddPointToMapLayer(myMap, evaluatePoints, out featureSet);

AccessGPService(featureSet);

}

private void AccessGPService(FeatureSet featureset)

{

HttpWebRequest.RegisterPrefix("http://", System.Net.Browser.WebRequestCreator.ClientHttp);

_ContourTask = new Geoprocessor("GP服务地址");

List<GPParameter> parameters = new List<GPParameter>();

parameters.Add(new GPFeatureRecordSetLayer("RainPoint", featureset)); //这里的featureSet的Fields为null值，就是输入参数没有模型中的字段，请问是怎么回事呢？

parameters.Add(new GPDouble("Contour_interval", 5));

_ContourTask.UpdateDelay = 10000;

_ContourTask.OutputSpatialReference = myMap.SpatialReference; //设置输出空间参考系

_ContourTask.JobCompleted += new EventHandler<JobInfoEventArgs>(geoprocessorTask_JobCompleted);

_ContourTask.Failed += new EventHandler<TaskFailedEventArgs>(geoprocessorTask_Failed);

_ContourTask.SubmitJobAsync(parameters);

}

/********************************事件处理程序段***********************************/

void geoprocessorTask_JobCompleted(object sender, JobInfoEventArgs e)

{

Geoprocessor gp = sender as Geoprocessor;

//注册前缀

HttpWebRequest.RegisterPrefix("http://", System.Net.Browser.WebRequestCreator.ClientHttp);

gp.GetResultDataCompleted += new EventHandler<GPParameterEventArgs>(gp_GetResultDataCompleted);

gp.GetResultDataAsync(e.JobInfo.JobId, "Contour_Kriging_Clip");

}

void gp_GetResultDataCompleted(object sender, GPParameterEventArgs e)

{

//找到显示等值线图层并清空，然后再次加载

GraphicsLayer layer = myMap.Layers["GraphicsDZX"] as GraphicsLayer;

layer.ClearGraphics();

GPFeatureRecordSetLayer gplayer = e.Parameter as GPFeatureRecordSetLayer;

MessageBox.Show("结果图层个数：" + gplayer.FeatureSet.Features.Count.ToString()); //这里的gplayer.FeatureSet为null值，错误就出现在这里

foreach (Graphic graphic in gplayer.FeatureSet.Features)

{

graphic.Symbol = new ESRI.ArcGIS.Client.Symbols.SimpleLineSymbol()

{

Style = ESRI.ArcGIS.Client.Symbols.SimpleLineSymbol.LineStyle.Solid,

Color = new SolidColorBrush(Colors.Blue),

Width = 3

};

layer.Graphics.Add(graphic);

}

}

void geoprocessorTask_Failed(object sender, TaskFailedEventArgs e)

{

MessageBox.Show(e.Error.ToString());

}

//分类渲染

public Symbol getSymbol(Graphic graphic)

{

//线符号

SimpleLineSymbol symbol = new SimpleLineSymbol();

double yl = double.Parse(graphic.Attributes["YL"].ToString());

if (yl > 10)

{

symbol.Color = new SolidColorBrush(Colors.Red);

}

else

{

symbol.Color = new SolidColorBrush(Colors.Blue);

}

return symbol;

}

调用的Utility.cs类代码如下：

public class Utility

{

public static void AddPointToMapLayer(ESRI.ArcGIS.Client.Map map, MainPage2.EvaluationPointStruct[] evaluatePoints, out ESRI.ArcGIS.Client.Tasks.FeatureSet featureset)

{

ESRI.ArcGIS.Client.Projection.WebMercator mercator = new ESRI.ArcGIS.Client.Projection.WebMercator();

#region 动态添加预测点图层

if (map.Layers["YLPointsLayer"] != null)

{

map.Layers.Remove(map.Layers["YLPointsLayer"]);

}

GraphicsLayer graphicslayer = new GraphicsLayer()

{

ID = "YLPointsLayer",

};

map.Layers.Add(graphicslayer);

#endregion

#region 将网格划分点添加到图层中

GraphicCollection graphicCollection = new GraphicCollection();

foreach (MainPage2.EvaluationPointStruct evaluationpoint in evaluatePoints)

{

Graphic g = new Graphic()

{

Geometry = mercator.FromGeographic(new MapPoint(evaluationpoint.Latitute, evaluationpoint.Longitute)),

Symbol = new ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol()

{

Style = ESRI.ArcGIS.Client.Symbols.SimpleMarkerSymbol.SimpleMarkerStyle.Circle,

Size = 9,

Color = new SolidColorBrush(Colors.Red)

}

};

g.Attributes.Add("OBJECTID", "");

g.Attributes.Add("SHAPE", "Point");

g.Attributes.Add("YL", evaluationpoint.YL);

graphicCollection.Add(g);

graphicslayer.Graphics.Add(g);

}

featureset = new FeatureSet(graphicCollection);

#endregion

}

}

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