Arcgis Engine（ae）接口详解（6）：workspace操做

//此处用的workspace来源与用户选择
                IWorkspace workspace = null;

                //workspace通常等同于数据库

                //工做空间类型，也可理解为数据库类型
                //esriFileSystemWorkspace：可能为shp
                //esriLocalDatabaseWorkspace：可能为file gdb，mdb
                //esriRemoteDatabaseWorkspace：可能为sde
                esriWorkspaceType workspaceType = workspace.Type;

                //路径，对于本地文件类型的（例如shp，file gdb，mdb）有意义，就是他们的文件路径
                string path = workspace.PathName;

                //数据库链接配置，一般对于sde有效
                IPropertySet propertySet = workspace.ConnectionProperties;
                //如下是遍历他的值的代码
                object objNames = null;
                object objValue = null;
                //获取全部值，结构是相似字段的key/value格式，参数1是name的数组，参数2是value的数组                
                //参数类型是object，但实际分别是string数组和object数组
                propertySet.GetAllProperties(out objNames, out objValue);
                string[] names = (string[])objNames;
                object[] values = (object[])objValue;
                //遍历获取各个值
                for (int i = 0; i < names.Length; i++)
                {
                    //参数名
                    string name = names[i];
                    //参数值
                    string value = values[i].ToString();
                }

                //如下代码因为不具有测试数据，只看代码不运行
                if (1 == 2)
                {
                    //执行原生sql
                    //若是Workspace数据类型是数据库如sde，能够经过此方法执行原生sql
                    //这里只能执行不返回结果的sql，例如insert，update等，而不能select
                    workspace.ExecuteSQL("update xxx set eee=111");
                }

                //PS：以上代码能够获取sde数据库的配置，但密码获取到的是乱码，由于想在ae获取sde完整的链接参数（一般用于再次新建对sde的链接）是不可能的

                //遍历workspace下全部的数据集
                //get_Datasets方法用于获取workspace下的成员，参数1是获取的数据类型
                //IEnum开头的接口相似于游标，用于遍历一些查询结果
                IEnumDataset enumDataset = workspace.get_Datasets(esriDatasetType.esriDTFeatureDataset);
                enumDataset.Reset();
                //由于下面还要遍历数据集下的featureClass，所以用了IFeatureDataset，其实也能够as到IDataset
                IFeatureDataset featureDataset = null;
                while ((featureDataset = enumDataset.Next() as IFeatureDataset) != null)
                {
                    //数据集的基础属性

                    IDataset dataset = featureDataset as IDataset;
                    //数据集名称
                    string datasetName = dataset.Name;
                    //数据集类型
                    esriDatasetType datasetType = dataset.Type;

                    //IGeoDataset是几何相关的接口
                    IGeoDataset geoDataset = featureDataset as IGeoDataset;
                    //空间参考
                    ISpatialReference spatialReference2 = geoDataset.SpatialReference;


                    //获取数据集下全部的featureClass

                    IFeatureClassContainer featureClassContainer = featureDataset as IFeatureClassContainer;
                    IEnumFeatureClass enumFeatureClass = featureClassContainer.Classes;
                    enumFeatureClass.Reset();
                    IFeatureClass featureClass = null;
                    //遍历数据集里的要素类
                    while ((featureClass = enumFeatureClass.Next()) != null)
                    {


                    }
                    //IEnum开头的接口用完都要手动释放（与游标同样）
                    System.Runtime.InteropServices.Marshal.FinalReleaseComObject(enumFeatureClass);
                }
                //IEnum开头的接口用完都要手动释放（与游标同样）
                System.Runtime.InteropServices.Marshal.FinalReleaseComObject(enumDataset);

                //遍历workspace下的featureClass
                //PS：结合上面的代码能够注意到，获取数据集下的featureClass和获取workspace下的featureClass的代码是分开的

                enumDataset = workspace.get_Datasets(esriDatasetType.esriDTFeatureClass);
                enumDataset.Reset();
                IFeatureClass featureClass2 = enumDataset.Next() as IFeatureClass;
                while ((featureClass2 = enumDataset.Next() as IFeatureClass) != null)
                {

                }
                //IEnum开头的接口用完都要手动释放（与游标同样）
                System.Runtime.InteropServices.Marshal.FinalReleaseComObject(enumDataset);

                //获取Workspace的全部FeatureClass（包括Dataset里面的）
                List<IFeatureClass> lstFeatureClass = WorkspaceEdmHelper.GetAllFeatureClassInWorkspace(workspace as IFeatureWorkspace);

                //Workspace关于featureClass操做的接口
                IFeatureWorkspace featureWorkspace = workspace as IFeatureWorkspace;
                //如下代码因为不具有测试数据，只看代码不运行
                if (1 == 2)
                {
                    //经过名称获取featureClass
                    //PS：即便featureClass在数据集下也能够这样获取，这点跟遍历不一样
                    featureClass2 = featureWorkspace.OpenFeatureClass("www");

                    //经过名称获取数据集
                    featureDataset = featureWorkspace.OpenFeatureDataset("rrr");


                    //经过文件路径或数据库链接参数，新建数据库或打开数据库

                    //建立File Gdb，参数1是文件所在文件夹，参数2是数据库名称
                    //因为一个file gdb数据库等同于一个workspace，所以建立file gdb等同于建立workspace                    
                    featureWorkspace = WorkspaceEdmHelper.CreateFileGdb("C:\\aaa", "test.gdb");

                    //建立personal gdb（mdb），参数1是文件所在文件夹，参数2是数据库名称
                    featureWorkspace = WorkspaceEdmHelper.CreatePersonalGdb("C:\\aaa", "test.mdb");                   
                }

被调用的封装函数代码以下

/// <summary>
        /// 获取Workspace的全部FeatureClass（包括Dataset里面的）
        /// </summary>
        /// <param name="featureWorkspace"></param>
        /// <returns></returns>
        public static List<IFeatureClass> GetAllFeatureClassInWorkspace(IFeatureWorkspace featureWorkspace)
        {
            IWorkspace workspace = featureWorkspace as IWorkspace;
            List<IFeatureClass> featureClassResult = new List<IFeatureClass>();

            //首先遍历数据集
            IEnumDataset enumDataset = workspace.get_Datasets(esriDatasetType.esriDTFeatureDataset);
            enumDataset.Reset();
            IFeatureDataset featureDataset = enumDataset.Next() as IFeatureDataset;
            while (featureDataset != null)
            {
                IFeatureClassContainer featureClassContainer = featureDataset as IFeatureClassContainer;
                IEnumFeatureClass enumFeatureClassTarget = featureClassContainer.Classes;
                enumFeatureClassTarget.Reset();
                IFeatureClass featureClass = enumFeatureClassTarget.Next();
                //遍历数据集里的要素类
                while (featureClass != null)
                {
                    featureClassResult.Add(featureClass);

                    featureClass = enumFeatureClassTarget.Next();
                }
                System.Runtime.InteropServices.Marshal.FinalReleaseComObject(enumFeatureClassTarget);
                System.Runtime.InteropServices.Marshal.FinalReleaseComObject(featureDataset);

                featureDataset = enumDataset.Next() as IFeatureDataset;
            }
            System.Runtime.InteropServices.Marshal.FinalReleaseComObject(enumDataset);

            //而后遍历在数据库根目录的要素类
            enumDataset = workspace.get_Datasets(esriDatasetType.esriDTFeatureClass);
            enumDataset.Reset();
            IFeatureClass featureClass2 = enumDataset.Next() as IFeatureClass;
            while (featureClass2 != null)
            {
                featureClassResult.Add(featureClass2);

                featureClass2 = enumDataset.Next() as IFeatureClass;
            }
            System.Runtime.InteropServices.Marshal.FinalReleaseComObject(enumDataset);

            return featureClassResult;
        }

        /// <summary>
        /// 建立Fiel Gdb
        /// </summary>
        /// <param name="directory"></param>
        /// <param name="gdbName"></param>
        /// <returns></returns>
        public static IFeatureWorkspace CreateFileGdb(string directory, string gdbName)
        {
            IWorkspaceFactory workspaceFactory = new FileGDBWorkspaceFactoryClass();
            IName name = (IName)workspaceFactory.Create(directory, gdbName, null, 0);
            return (IFeatureWorkspace)name.Open();
        }

        /// <summary>
        /// 建立Personal Gdb（Mdb）
        /// </summary>
        /// <param name="directory"></param>
        /// <param name="gdbName"></param>
        /// <returns></returns>
        public static IFeatureWorkspace CreatePersonalGdb(string directory, string gdbName)
        {
            IWorkspaceFactory workspaceFactory = new AccessWorkspaceFactoryClass();
            IName name = (IName)workspaceFactory.Create(directory, gdbName, null, 0);
            return (IFeatureWorkspace)name.Open();
        }