ArcGis Engine 要素折点转点的代码实现

要素折点转点的代码实现"/>

ArcGis Engine 要素折点转点的代码实现

ArcGIS中的GP工具要素折点转点使用起来十分方便，速度也十分快，但是也存在一些问题，比如要求最高权限，转点时会对一些过近的点进行合并（待深入考察）。

因此在某些时候需要用代码实现该功能，在以前因为代码缺陷未实现该功能，只能用GP去实现。

代码如下：

 /// <summary>/// 要素节点转点/// </summary>/// <param name="IN_Featureclass">要转换的要素类</param>/// <param name="IN_FeatureDataset">要生成转换后要素类的要素数据集</param>/// <returns>生成的点要素类</returns>private IFeatureClass PRV_FeatureVerticesToPoints(IFeatureClass IN_Featureclass, IFeatureDataset IN_FeatureDataset){//创建要素类IFeatureClass Temp_VPFeatureClass = IN_FeatureDataset.CreateFeatureClass(IN_Featureclass.AliasName + "折点转点", PRV_SetFields(IN_Featureclass), null, null, esriFeatureType.esriFTSimple, "Shape", "");//提取所有要素IFeatureCursor Temp_GetEachFeature = IN_Featureclass.Search(null, false);IFeature Temp_EachFeature = Temp_GetEachFeature.NextFeature();if (Temp_EachFeature != null){//一般来需要添加下方的开启工作空间编辑的命令，但是实际使用时却发现会造成内存泄漏问题。//IWorkspaceEdit Temp_WorkspaceEdit = (IWorkspaceEdit)IN_FeatureDataset.Workspace;//Temp_WorkspaceEdit.StartEditing(true);//Temp_WorkspaceEdit.StartEditOperation();IFeatureBuffer Temp_FeatureBuffer = Temp_VPFeatureClass.CreateFeatureBuffer();IFeatureCursor Temp_FeatureCursor = Temp_VPFeatureClass.Insert(true);//尽量不在循环中创建变量IPointCollection Temp_Vertices;IPoint Each_Point = new PointClass();int i;//将点存入要素类while (Temp_EachFeature != null){//获取要素的点集Temp_Vertices = Temp_EachFeature.Shape as IPointCollection;for (i= 0; i < Temp_Vertices.PointCount - 1; i++){Temp_Vertices.QueryPoint(i,Each_Point);//据说get_Point(i)方法回比QueryPoint(i,Each_Point)方法速度慢，但是实际使用没感觉出来//Each_Point = Temp_Vertices.get_Point(i);Temp_FeatureBuffer.Shape = Each_Point;Temp_FeatureCursor.InsertFeature(Temp_FeatureBuffer);} Temp_EachFeature = Temp_GetEachFeature.NextFeature();}Temp_FeatureCursor.Flush();//清理资源并返回System.Runtime.InteropServices.Marshal.FinalReleaseComObject(Temp_GetEachFeature);}return Temp_VPFeatureClass;}private IFields PRV_SetFields(IFeatureClass IN_Featureclass)//设字段的函数{//创建必要字段IFeatureClassDescription Temp_FeatureClassDescription = new FeatureClassDescriptionClass();IObjectClassDescription Temp_ObjectClassDescription = (IObjectClassDescription)Temp_FeatureClassDescription;IFields Temp_Fields = Temp_ObjectClassDescription.RequiredFields;int Temp_ShapeFieldIndex = Temp_Fields.FindField(Temp_FeatureClassDescription.ShapeFieldName);IField Temp_RequiredField = Temp_Fields.get_Field(Temp_ShapeFieldIndex);//设定几合字段IGeometryDef Temp_GeometryDef = Temp_RequiredField.GeometryDef;IGeometryDefEdit Temp_GeometryDefEdit = (IGeometryDefEdit)Temp_GeometryDef;Temp_GeometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint;ISpatialReferenceFactory Temp_SpatialRefFac = new SpatialReferenceEnvironmentClass();//以备用点为模板构建空间参考Temp_GeometryDefEdit.SpatialReference_2 = (IN_Featureclass as IGeoDataset).SpatialReference;//验证字段IFieldChecker Temp_FieldChecker = new FieldCheckerClass();IEnumFieldError Temp_FieldsError = null;IFields Temp_AllRightFields = null;//验证无误的字段集Temp_FieldChecker.ValidateWorkspace = (IWorkspace)IN_Featureclass.FeatureDataset.Workspace;Temp_FieldChecker.Validate(Temp_Fields, out Temp_FieldsError, out Temp_AllRightFields);//本例添加"OriginClassOID"字段IFieldsEdit Temp_FiledsEditor = Temp_AllRightFields as IFieldsEdit;IField Temp_OriginOIDFields = new FieldClass();IFieldEdit2 Temp_FiledEditor = Temp_OriginOIDFields as IFieldEdit2;Temp_FiledEditor.Type_2 = esriFieldType.esriFieldTypeInteger;Temp_FiledEditor.Name_2 = "OriginClassOID";Temp_FiledsEditor.AddField(Temp_OriginOIDFields);return Temp_AllRightFields;}

在插入feature时，如果开启了工作空间编辑（IWorkSpaceEdit.StartEditing），因为要满足对每次操作可以撤销，工作空间并不会自动释放存储的改变信息。随着insert的要素越来越多而不store，内存就泄露了，因此会报错。

参考 .html