ArcEngine开发点滴1

用AE搞gis开发，增加、修改、删除ifeature 是难免的，项目中写了一个通用的添加要素的通用方法，发出来，望大家批评指正

1)添加新要素

/// <summary>

/// 添加新要素

/// </summary>

/// <param name="pFeatClass">要更新的要素类</param>

/// <param name="fieldAndValues">更新的字段值，key是字段的名称，value是字段的值</param>

/// <param name="geometry">图?形?对?象?</param>

/// <returns>是?否?添?加?成?功?</returns>

public static bool NewFeature(IFeatureClass pFeatClass, Hashtable fieldAndValues, IGeometry geometry)

{

    bool IsEdited = false;

    if (geometry == null) return false;

    if (pFeatClass == null) throw new Exception("要?更?新?的?要?素?类?不?能?为?空?！?");



    if (pFeatClass.ShapeType != geometry.GeometryType) throw new Exception("要?更?新?的?要?素?类?和?要?素?的?对?象?类?型?不?一?致?，?无?法?更?新?！?");

    IDataset pDS = pFeatClass as IDataset;

    IWorkspaceEdit pWSE = pDS.Workspace as IWorkspaceEdit;

    if (pWSE.IsBeingEdited())

    {

        IsEdited = true;

    }

    else

    {

        pWSE.StartEditing(true);

    }

    pWSE.StartEditOperation();





    IFeature pFeat = pFeatClass.CreateFeature();

    try

    {

        foreach (string key in fieldAndValues.Keys)

        {

            int pIndex = pFeat.Fields.FindField(key);

            if (pIndex < 0) throw new Exception("要?素?不?存?在?名?称?为?"+key+ " 的?字?段?！?");

            pFeat.set_Value(pIndex, fieldAndValues[key]);

        }



     

        pFeat.Shape = geometry;

        pFeat.Store();



        pWSE.StopEditOperation();



        if (!IsEdited) pWSE.StopEditing(true);



        return true;

    }



    catch (Exception ex)

    {

        pWSE.AbortEditOperation();

        if (!IsEdited) pWSE.StopEditing(false);



        return false;

    }

    finally

    {

        ReleaseComObject(pDS);

        ReleaseComObject(pWSE);

        ReleaseComObject(pFeat);

    }



}

2)更新新要素

输入的参数比新建的多了一个，strWhere 是pFeatClass搜索要删除的要素的过滤条件

public static bool UpdateFeature(IFeatureClass pFeatClass, string strWhere, Hashtable fieldNameAndValues, IGeometry geometry)

{

    bool IsEdited = false;

    if (pFeatClass == null)  throw new Exception("要更新的要素类不能为空！?");

    if (pFeatClass.ShapeType != geometry.GeometryType) throw new Exception("要?更?新?的?要?素?类?和?要?素?的?对?象?类?型?不?一?致?，?无?法?更?新?！?");



    IDataset pDS = pFeatClass as IDataset;

    IWorkspaceEdit pWSE = pDS.Workspace as IWorkspaceEdit;

    if (pWSE.IsBeingEdited())

    {

        IsEdited = true;

    }

    else

    {

        pWSE.StartEditing(true);

    }

    pWSE.StartEditOperation();



    IQueryFilter pQueryFilter = new QueryFilterClass();

    pQueryFilter.WhereClause = strWhere;



    IFeatureCursor pFeatureCursor = pFeatClass.Search(pQueryFilter, false);

    IFeature pFeat = pFeatureCursor.NextFeature();

    try

    {

        while (pFeat != null)

        {

            if (fieldNameAndValues != null)

            {

                foreach (object   key in fieldNameAndValues.Keys)

                {

                    int pIndex = pFeat.Fields.FindField(key.ToString());

                    if (pIndex > 0)

                        pFeat.set_Value(pIndex,fieldNameAndValues[key]);

                    else

                    {

                        throw new Exception(string.Format("要?素?类?'{0}'不?存?在?名?称?为?'{1}'的?属?性?！?",pFeatClass.AliasName,key.ToString()));

                    }

                }

            }



            if (geometry != null) pFeat.Shape = geometry;

            pFeat.Store();

            pFeat = pFeatureCursor.NextFeature();

        }

        pWSE.StopEditOperation();



        if (!IsEdited) pWSE.StopEditing(true);

        //Marshal.FinalReleaseComObject(pFeatureCursor);

        return true;

    }



    catch (Exception ex)

    {



        pWSE.AbortEditOperation();

        if (!IsEdited) pWSE.StopEditing(false);



        return false;

    }

    finally

    {

        ReleaseComObject(pDS);

        ReleaseComObject(pWSE);

        ReleaseComObject(pQueryFilter);

        ReleaseComObject(pFeat);

    }

3）删除要素

当条件 为Null 或“” 时，将删除所有数据

/// <summary>

        /// 删?除?符?合?条?件?的?要?素?

        /// </summary>

        /// <param name="pFeatClass">图?层?要?素?类?</param>

        /// <param name="strWhere">查?询?条?件?</param>

        /// <returns>是?否?删?除?成?功?</returns>

        public static bool DeleteFeature(IFeatureClass pFeatClass, string strWhere)

        {

            if (pFeatClass == null) return false;

            ITable pTable = pFeatClass as ITable;

            IQueryFilter pQueryFilter = new QueryFilterClass();

            pQueryFilter.WhereClause = strWhere;

            try

            {

                pTable.DeleteSearchedRows(pQueryFilter);

                return true;

            }

            catch (Exception ex)

            {

                return false;

            }

            finally

            {

                ReleaseComObject(pTable);

                ReleaseComObject(pQueryFilter);

            }

        }