【Microstation Addin】从外部读取EC XML文件

Bentley.ECObjects.ECObjects Class

Assembly Bentley.ECObjects3.dll

//
        // Summary:
        //     Locates an ECXML schema.
        //
        // Parameters:
        //   schemaName:
        //     The name of the desired schema.
        //
        //   versionMajor:
        //     The major version of the desired schema.
        //
        //   versionMinor:
        //     The minor version of the desired schema.
        //
        //   matchType:
        //     The SchemaMatchType.
        //
        //   parentSchema:
        //     The schema where the schema reference was located, if resolving a schema reference.
        //
        //   context:
        //     An object passed to the LocateSchema method by the requestor. It is useful when
        //     a schema requestor and a schema locater are designed to cooperate.
        //
        // Remarks:
        //     The LocateSchema method, using the installed IECSchemaLocaters registered by
        //     calling Bentley.ECObjects.ECObjects.AddSchemaLocater(Bentley.ECObjects.Schema.IECSchemaLocater),
        //     provides a way for finding known IECSchemas.
        //     Schemas have a major and minor version number, and the matchType argument specifies
        //     how those version numbers are used when searching for a schema.
        //     The ECObjects system internally searches for referenced schemas while deserializing
        //     XML Schema files.
        public static IECSchema LocateSchema(string schemaName, int versionMajor, int versionMinor, SchemaMatchType matchType, IECSchema parentSchema, object context);

        // Summary:
        //     Locates an ECXML schema.
        //
        // Parameters:
        //   fullSchemaName:
        //     The name of the desired schema including version number.
        //
        //   matchType:
        //     The SchemaMatchType.
        //
        //   parentSchema:
        //     The schema where the schema reference was located, if resolving a schema reference.
        //
        //   context:
        //     An object passed to the LocateSchema method by the requestor. It is useful when
        //     a schema requestor and a schema locater are designed to cooperate.
        //
        // Remarks:
        //     The LocateSchema method, using the installed IECSchemaLocaters registered by
        //     calling Bentley.ECObjects.ECObjects.AddSchemaLocater(Bentley.ECObjects.Schema.IECSchemaLocater),
        //     provides a way for finding known IECSchemas.
        //     Schemas have a major and minor version number, and the matchType argument specifies
        //     how those version numbers are used when searching for a schema.
        //     The ECObjects system internally searches for referenced schemas while deserializing
        //     XML Schema files.
        public static IECSchema LocateSchema(string fullSchemaName, SchemaMatchType matchType, IECSchema parentSchema, object context);

  public static IECSchema LocateSchema(string schemaName, int versionMajor, int versionMinor, SchemaMatchType matchType, IECSchema parentSchema, object context);

参数中的context如何使用？如何指定外部文件的路径名？

没有在.NET封装中找到与您所列的C++完全对应的函数。但SDK的例子C:\Program Files\Bentley\MicroStationCONNECTSDK\examples\DgnEC\DgnECManagedCrudExample\DgnECManagedCrudExample.cs中有如下函数(或叫方法)供参考:

public static void LocateAndLoadSchema(string parser)
        {
            try
            {
                Assembly assembly = Assembly.GetExecutingAssembly();
                string schemaSearchPath = Path.GetDirectoryName(assembly.Location);
                IECSchemaLocater searchLocater = new SearchPathSchemaFileLocater(schemaSearchPath);
                if (null == searchLocater)
                    return;
                ECObjects.AddSchemaLocater(searchLocater);
                /*ECSchema is data that describes data (i.e. metadata). ECSchema provides a way to express the structure, context, 
                and to some extent, the meaning of EC data, allowing programmatic understanding, presentation, analysis, and even manipulation of that data.
                Locates an ECXML Schema */
                ecSimpleSchema = ECObjects.LocateSchema(schemaName, SchemaMatchType.Exact, null, null);
                if (null == ecSimpleSchema)
                    MessageCenter.Instance.StatusMessage = DgnECManagedCrudExample.rm.GetString("ERROR_SCHEMANOTFOUND");
                else
                {
                    DgnECManager dgnECManager = DgnECManager.Manager;
                    if (null == dgnECManager)
                        return;
                    DgnFile activeDgnFile = Session.Instance.GetActiveDgnFile();
                    SchemaImportStatus schemaImportStatus = dgnECManager.ImportSchema(ecSimpleSchema, activeDgnFile, new ImportSchemaOptions(true));
                    MessageCenter.Instance.StatusMessage = DgnECManagedCrudExample.rm.GetString("Success_Schema_Import");
                }
            }
            catch (Exception ex)
            {
                MessageCenter.Instance.StatusMessage = ex.Message;
                MessageCenter.Instance.StatusWarning = ex.Message;
            }
        }
        #endregion