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);
            }
        }