在AE中创建内存图层(转)
使用IWorkspaceFactory,IWorkspaceName,IName,IWorkspace等接口以及InMemoryWorkspaceFactoryClass对象创建在程序运行时的内存中的矢量要素层 直接上代码: ///<summary>/// 在程序运行时的内存中创建矢量要素层,并加到地图控件最顶端 ///</summary> /// <param name="pMapCtrl">地图控件</param> ///<returns>IFeatureLayer 新加的要素层</returns> private IFeatureLayer AddFeatureLayerByMemoryWS(AxMapControl pMapCtrl, ISpatialReference pSReference) { try { if (pMapCtrl == null) return null; //创建新的内存工作空间 IWorkspaceFactory pWSF = new InMemoryWorkspaceFactoryClass(); IWorkspaceName pWSName = pWSF.Create("","Temp",null,0); IName pName = (IName)pWSName; IWorkspace pMemoryWS = (IWorkspace)pName.Open(); IField oField = new FieldClass(); IFields oFields = new FieldsClass(); IFieldsEdit oFieldsEdit = null; IFieldEdit oFieldEdit = null; IFeatureClass oFeatureClass = null; IFeatureLayer oFeatureLayer = null; try { oFieldsEdit = oFields as IFieldsEdit; oFieldEdit = oField as IFieldEdit; oFieldEdit.Name_2 = "OBJECTID"; oFieldEdit.Type_2 = esriFieldType.esriFieldTypeOID; oFieldEdit.IsNullable_2 = false; oFieldEdit.Required_2 = false; oFieldsEdit.AddField(oField); oField = new FieldClass(); oFieldEdit = oField as IFieldEdit; IGeometryDef pGeoDef = new GeometryDefClass(); IGeometryDefEdit pGeoDefEdit = (IGeometryDefEdit)pGeoDef; pGeoDefEdit.AvgNumPoints_2 = 5; pGeoDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolygon; pGeoDefEdit.GridCount_2 = 1; pGeoDefEdit.HasM_2 = false; pGeoDefEdit.HasZ_2 = false; pGeoDefEdit.SpatialReference_2 = pSReference; oFieldEdit.Name_2 = "SHAPE"; oFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry; oFieldEdit.GeometryDef_2 = pGeoDef; oFieldEdit.IsNullable_2 = true; oFieldEdit.Required_2 = true; oFieldsEdit.AddField(oField); oField = new FieldClass(); oFieldEdit = oField as IFieldEdit; oFieldEdit.Name_2 = "Code"; oFieldEdit.Type_2 = esriFieldType.esriFieldTypeSmallInteger; oFieldEdit.IsNullable_2 = true; oFieldsEdit.AddField(oField); //创建要素类 oFeatureClass = (pMemoryWS as IFeatureWorkspace).CreateFeatureClass("Temp", oFields, null, null, esriFeatureType.esriFTSimple, "SHAPE", ""); oFeatureLayer = new FeatureLayerClass(); oFeatureLayer.Name = "TransTemp"; oFeatureLayer.FeatureClass = oFeatureClass; //创建唯一值符号化对象 IUniqueValueRenderer pURender = new UniqueValueRendererClass(); pURender.FieldCount = 1; pURender.set_Field(0, "Code"); pURender.UseDefaultSymbol = false; ISimpleFillSymbol pFillSym = new SimpleFillSymbolClass(); pFillSym.Style = esriSimpleFillStyle.esriSFSSolid; //半透明颜色 IRgbColor pColor = new RgbColorClass(); pColor.Red = 255; pColor.Green = 255; pFillSym.Color = pColor; pURender.AddValue("1", "", pFillSym as ISymbol); pFillSym = new SimpleFillSymbolClass(); pFillSym.Style = esriSimpleFillStyle.esriSFSSolid; //唯一值符号化内存图层 (oFeatureLayer as IGeoFeatureLayer).Renderer = pURender as IFeatureRenderer; ILayerEffects pLyrEffect = oFeatureLayer as ILayerEffects; //透明度 pLyrEffect.Transparency = 80; } catch (Exception Err) { MessageBox.Show(Err.Message); } finally { try{ System.Runtime.InteropServices.Marshal.ReleaseComObject(oField); System.Runtime.InteropServices.Marshal.ReleaseComObject(oFields); System.Runtime.InteropServices.Marshal.ReleaseComObject(oFieldsEdit); System.Runtime.InteropServices.Marshal.ReleaseComObject(oFieldEdit); System.Runtime.InteropServices.Marshal.ReleaseComObject(pName); System.Runtime.InteropServices.Marshal.ReleaseComObject(pWSF); System.Runtime.InteropServices.Marshal.ReleaseComObject(pWSName); System.Runtime.InteropServices.Marshal.ReleaseComObject(pMemoryWS); System.Runtime.InteropServices.Marshal.ReleaseComObject(oFeatureClass); } catch { } GC.Collect(); } return oFeatureLayer; } catch (Exception Err) { MessageBox.Show(Err.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information); return null; } }
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