C# 如何在多边形ArcGIS中计算和选择点？

我正在尝试创建一个按钮，用于计算和选择多边形内的所有点

protected override void OnClick()
    {   IActiveView activeView = ArcMap.Document.ActiveView;
        IEnumLayer featureClasses = activeView.FocusMap.Layers;

        if (featureClasses != null){
            ILayer layer ;
            while((layer = featureClasses.Next()) != null){

                if (layer as IFeatureLayer == null)
                    continue;
                if (layer.Name == "EX_BOUNDARY")//Name of polygon layer.{
                    var ftrLayer = layer as IFeatureLayer;
                    var ftrClass = ftrLayer.FeatureClass;

                    if (ftrClass == null)
                        continue;
                    GetSelectedPolygon(activeView, ftrClass, layer);
                }

            }
        }
    }

方法获取选定多边形，选择并计算其中的点

public void GetSelectedPolygon(IActiveView activeView, IFeatureClass featureClass, ILayer a)
    {

        //Check that the selected geometry is a polygon.
        IMap map = activeView.FocusMap;
        var selectedFeatures1 = (IEnumFeature)map.FeatureSelection;
        IFeature selectedFeature = selectedFeatures1.Next();
        IGeometry selectedGeometry = selectedFeature.ShapeCopy;


        if (selectedGeometry != null && selectedGeometry.GeometryType == esriGeometryType.esriGeometryPolygon)
        {
            //execute query for all points inside polygon.
            ISpatialFilter spatialFilter = new SpatialFilterClass();
            spatialFilter.Geometry = selectedGeometry;
            spatialFilter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects;
            FeatureCursor featureCursor = null;
            var srchResult = featureClass.Search(spatialFilter, false);
            featureCursor = (FeatureCursor) featureClass.Search(spatialFilter, false);


            //select outcoming queries and their count.
            //map.FeatureSelection = srchResult as ISelection;
            IFeature singleSearchFeature = null;
            while ((singleSearchFeature = srchResult.NextFeature()) != null){
                //only looped once.
                map.SelectFeature(a,singleSearchFeature);
            }
            var count = srchResult.Fields.FieldCount;
            MessageBox.Show(count.ToString());
        }
    }

我对整个地理信息系统文化非常陌生，我刚刚开始实际培训。这是我需要完成的主要任务之一，我从概念上理解事物是如何工作的，但这对我来说都是非常新的

我怀疑我用于搜索的查询有问题，因为我所有的尝试都是选择一个多边形，然后单击我的按钮，结果消息框显示4，无论多边形中有多少个点，它也不会选择任何点

请帮忙。谢谢：）

“srchResult.Fields.FieldCount”错误。FieldCount是特征字段的数量

您可以使用以下选项：

    protected override void OnClick()
    {
        try
        {
            IMxDocument document = (IMxDocument)ArcMap.Document;
            IMap map = document.FocusMap;
            IActiveView activeView = document.ActiveView;

            if (map.SelectionCount != 1)
            {
                MessageBox.Show("Select one polygon.");
                return;
            }

            // Get the polygon for selecting features
            IEnumFeature features = (IEnumFeature)map.FeatureSelection;
            IFeature feature = features.Next();
            IGeometry geometry = feature.ShapeCopy;

            if (geometry.GeometryType != esriGeometryType.esriGeometryPolygon)
            {
                MessageBox.Show("Select one polygon.");
                return;
            }

            // Find layer to select features
            UID uid = new UIDClass() { Value = typeof(IFeatureLayer).GUID.ToString("B") };
            IEnumLayer layers = map.get_Layers(uid);

            string layerName = "Name of your points layer to select";

            ILayer layer = null;
            IFeatureLayer featureLayer = null;
            while ((layer = layers.Next()) != null)
            {
                if (layer.Name == layerName)
                {
                    featureLayer = (IFeatureLayer)layer;
                    break;
                }
            }

            map.ClearSelection();

            SelectByPolygon(featureLayer, geometry);

            activeView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, activeView.Extent);
            ISelectionEvents selectionEvents = (ISelectionEvents)map;
            selectionEvents.SelectionChanged();

            MessageBox.Show(string.Format("Number of selected features is {0}", map.SelectionCount));
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }


    /// <summary>
    /// Select features.
    /// </summary>
    /// <param name="featurelayer">Layers to select features.</param>
    /// <param name="polygon">Polygon geometry for select features.</param>
    public void SelectByPolygon(IFeatureLayer featurelayer, IGeometry polygon)
    {
        ISpatialFilter filter = new SpatialFilterClass();
        filter.Geometry = polygon;
        filter.SpatialRel = esriSpatialRelEnum.esriSpatialRelContains;

        var featureSelection = (IFeatureSelection)featurelayer;
        featureSelection.SelectFeatures(filter, esriSelectionResultEnum.esriSelectionResultNew, false);
        featureSelection.SelectionChanged();
    }

protectedoverride void OnClick（）
{
尝试
{
IMxDocument document=（IMxDocument）ArcMap.document；
IMap map=document.FocusMap；
IActiveView-activeView=document.activeView；
如果（map.SelectionCount！=1）
{
显示（“选择一个多边形”）；
返回；
}
//获取用于选择要素的多边形
IEnumFeature features=（IEnumFeature）map.FeatureSelection；
IFeature feature=features.Next（）；
IGeometry几何=feature.ShapeCopy；
if（geometry.GeometryType！=esriGeometryType.esriGeometryPolygon）
{
显示（“选择一个多边形”）；
返回；
}
//查找图层以选择要素
UID=newUIDClass（）{Value=typeof（IFeatureLayer）.GUID.ToString（“B”）}；
IEnumLayer layers=map.get_layers（uid）；
string layerName=“要选择的点图层的名称”；
ILayer layer=null；
IFeatureLayer featureLayer=null；
而（（layer=layers.Next（））！=null）
{
if（layer.Name==layerName）
{
featureLayer=（IFeatureLayer）层；
打破
}
}
map.ClearSelection（）；
选择多边形（特征层、几何体）；
activeView.PartialRefresh（esriViewDrawPhase.esriViewGeoSelection，null，activeView.Extent）；
ISelectionEvents selectionEvents=（ISelectionEvents）映射；
selectionEvents.SelectionChanged（）；
Show（string.Format（“所选功能的数量为{0}”，map.SelectionCount））；
}
捕获（例外情况除外）
{
MessageBox.Show（例如Message）；
}
}
/// 
///选择功能。
/// 
///选择要素的图层。
///选择要素的多边形几何图形。
公共空心SelectByPolygon（IFeatureLayer featurelayer、IGeometry polygon）
{
ISpatialFilter filter=新的空间过滤器类（）；
几何=多边形；
filter.SpatialRel=esrispatialelenum.esriSpatialRelContains；
变量featureSelection=（IFeatureSelection）featurelayer；
featureSelection.SelectFeatures（过滤器，ESRISelectResultEnum.ESRISelectResultNew，false）；
featureSelection.SelectionChanged（）；
}

所以我应该用我编写的GetSelectedPolygon方法替换它，只需在按钮的onClick（）事件中调用它？是的，您可以在onClick事件中编写它。您可以将参数“polygon”的GeometryType检查为ESRigometryType.ESRigometryPolyGon。如果您不理解某些内容，可以询问或查看：我现在就试试，如果我想排除存在的点或与多边形边相交的点，我该怎么办？我尝试了您的代码，但它不起作用，它一直说在我选择的任何多边形中都有2个点：/OnClick事件中将变量'layerName'设置为点图层的名称。