在之前，我们谈到过，在ADOMDCommand中是不可以执行Discover命令的，它基本上都对应了Execute命令
但是，如果我们确实需要通过ADOMD来完成Discover的操作，除了像上一篇讲到的，利用直接发送XMLA Envelope之外，是否还有其他方法
答案是：有
所有与Discover有关的操作，都可以通过ADOMDConnection的一个方法来完成：GetSchemaDataSet，很好的一点是，它直接返回一个DataSet
名稱
Description
AdomdConnection.GetSchemaDataSet (Guid, Object[])
Returns schema information from a data source by using a Guid object to specify which schema information to return and by applying any specified restrictions to the information.
AdomdConnection.GetSchemaDataSet (String, AdomdRestrictionCollection)
Returns schema information from a data source by using a schema name to identify which schema to retrieve and by applying any specified restrictions to the information.
AdomdConnection.GetSchemaDataSet (Guid, Object[], Boolean)
Returns schema information from a data source by using a Guid object to identify the information, applying any specified restrictions on the information, and optionally throwing an exception when inline errors occur.
AdomdConnection.GetSchemaDataSet (String, AdomdRestrictionCollection, Boolean)
Returns schema information from a data source by using a schema name to identify the information, applying any specified restrictions to the information, and optionally throwing an exception when inline errors occur.
AdomdConnection.GetSchemaDataSet (String, String, AdomdRestrictionCollection)
Returns schema information from a data source by using a schema name and namespace to identify the information, and by applying any specified restrictions to the information.
AdomdConnection.GetSchemaDataSet (String, String, AdomdRestrictionCollection, Boolean)
Returns schema information from a data source by using a schema name and namespace to identify the information, applying any specified restrictions to the information, and, optionally throwing an exception when inline errors occur.
关于Guid参数，可以参考
Actions
Contains the GUID of the MDSCHEMA_ACTIONS rowset.
Catalogs
Contains the GUID of the DBSCHEMA_CATALOGS schema rowset.
Columns
Contains the GUID of the DBSCHEMA_COLUMNS schema rowset.
Connections
Contains the GUID of the DISCOVER_CONNECTIONS schema rowset.
Cubes
Contains the GUID of the MDSCHEMA_CUBES schema rowset.
DataSources
Contains the GUID of the DISCOVER_DATASOURCES schema rowset.
DBConnections
Contains the GUID of the DISCOVER_DB_CONNECTIONS schema rowset.
Dimensions
Contains the GUID of the MDSCHEMA_DIMENSIONS schema rowset.
DimensionStat
Contains the GUID of the DISCOVER_DIMENSION_STAT schema rowset.
Enumerators
Contains the GUID of the DISCOVER_ENUMERATORS schema rowset.
Functions
Contains the GUID of the MDSCHEMA_FUNCTIONS schema rowset.
Hierarchies
Contains the GUID of the MDSCHEMA_HIERARCHIES schema rowset.
InputDataSources
Contains the GUID of the MDSCHEMA_INPUT_DATASOURCES schema rowset.
Instances
Contains the GUID of the DISCOVER_INSTANCES schema rowset.
Jobs
Contains the GUID of the DISCOVER_JOBS schema rowset.
Keywords
Contains the GUID of the DISCOVER_KEYWORDS schema rowset.
Kpis
Contains the GUID of the MDSCHEMA_KPIS schema rowset.
Levels
Contains the GUID of the MDSCHEMA_LEVELS schema rowset.
Literals
Contains the GUID of the DISCOVER_LITERALS schema rowset.
Locations
Contains the GUID of the DISCOVER_LOCATIONS schema rowset.
Locks
Contains the GUID of the DISCOVER_LOCKS schema rowset.
MasterKey
Contains the GUID of the DISCOVER_MASTER_KEY schema rowset.
MeasureGroupDimensions
Contains the GUID of the MDSCHEMA_MEASUREGROUP_DIMENSIONS schema rowset.
MeasureGroups
Contains the GUID of the MDSCHEMA_MEASUREGROUPS schema rowset.
Measures
Contains the GUID of the MDSCHEMA_MEASURES schema rowset.
MemberProperties
Contains the GUID of the MDSCHEMA_PROPERTIES schema rowset.
Members
Contains the GUID of the MDSCHEMA_MEMBERS schema rowset.
MemoryGrant
Contains the GUID of the DISCOVER_MEMORYGRANT schema rowset.
MemoryUsage
Contains the GUID of the DISCOVER_MEMORYUSAGE schema rowset.
MiningColumns
Contains the GUID of the MINING_COLUMNS schema rowset.
MiningFunctions
Contains the GUID of the MINING_FUNCTIONS schema rowset.
MiningModelContent
Contains the GUID of the MINING_MODEL_CONTENT schema rowset.
MiningModelContentPmml
Contains the GUID of the DMSCHEMA_MINING_MODEL_CONTENT_PMML schema rowset.
MiningModels
Contains the GUID of the MINING_MODELS schema rowset.
MiningModelXml
Contains the GUID of the DMSCHEMA_MINING_MODEL_XML schema rowset.
MiningServiceParameters
Contains the GUID of the SERVICE_PARAMETERS schema rowset.
MiningServices
Contains the GUID of the MINING_SERVICES schema rowset.
MiningStructureColumns
Contains the GUID of the DMSCHEMA_MINING_STRUCTURE_COLUMNS schema rowset.
MiningStructures
Contains the GUID of the DMSCHEMA_MINING_STRUCTURES schema rowset.
PartitionDimensionStat
Contains the GUID of the DISCOVER_PARTITION_DIMENSION_STAT schema rowset.
PartitionStat
Contains the GUID of the DISCOVER_PARTITION_STAT schema rowset.
PerformanceCounters
Contains the GUID of the DISCOVER_PERFORMANCE_COUNTERS schema rowset.
ProviderTypes
Contains the GUID of the PROVIDER_TYPES schema rowset.
SchemaRowsets
Contains the GUID of the DISCOVER_SCHEMA_ROWSETS schema rowset.
Sessions
Contains the GUID of the DISCOVER_SESSIONS schema rowset.
Sets
Contains the GUID of the MDSCHEMA_SETS schema rowset.
Tables
Contains the GUID of the DBSCHEMA_TABLES schema rowset.
TablesInfo
Contains the GUID of the DBSCHEMA_TABLES_INFO schema rowset.
TraceColumns
Contains the GUID of the DISCOVER_TRACE_COLUMNS schema rowset.
TraceDefinitionProviderInfo
Contains the GUID of the DISCOVER_TRACE_DEFINITION_PROVIDERINFO schema rowset.
TraceEventCategories
Contains the GUID of the DISCOVER_TRACE_EVENT_CATEGORIES schema rowset.
Traces
Contains the GUID of the DISCOVER_TRACES schema rowset.
Transactions
Contains the GUID of the DISCOVER_TRANSACTIONS schema rowset.
XmlaProperties
Contains the GUID of the DISCOVER_PROPERTIES schema rowset.
XmlMetadata
Contains the GUID of the DISCOVER_XML_METADATA schema rowset.
最后，我用一个比较简单的例子来让大家理解
我们用下面的代码连接到本地服务器，并且查询服务器所有的Session
AdomdConnection conn = new AdomdConnection("data source=localhost;catalog=Adventureworks");
conn.Open();
conn.GetSchemaDataSet(AdomdSchemaGuid.Sessions, null).WriteXml("../../sessions.xml");
conn.Close();
返回的结果大致如下，这是一个标准的DataSet，可以作为数据源绑定和处理
<?xml version="1.0" standalone="yes"?>
<NewDataSet>
<rowsetTable>
<SESSION_ID>995BFC52-8D0C-49E1-AD1C-39773B05F1B3</SESSION_ID>
<SESSION_SPID>1098</SESSION_SPID>
<SESSION_CONNECTION_ID>54</SESSION_CONNECTION_ID>
<SESSION_USER_NAME>THINKER\ChenXizhang</SESSION_USER_NAME>
<SESSION_CURRENT_DATABASE>Adventureworks</SESSION_CURRENT_DATABASE>
<SESSION_START_TIME>2009-06-25T23:46:18+08:00</SESSION_START_TIME>
<SESSION_ELAPSED_TIME_MS>3426078</SESSION_ELAPSED_TIME_MS>
<SESSION_LAST_COMMAND_START_TIME>2009-06-25T23:46:19+08:00</SESSION_LAST_COMMAND_START_TIME>
<SESSION_LAST_COMMAND_END_TIME>2009-06-25T23:46:20+08:00</SESSION_LAST_COMMAND_END_TIME>
<SESSION_LAST_COMMAND_ELAPSED_TIME_MS>0</SESSION_LAST_COMMAND_ELAPSED_TIME_MS>
<SESSION_IDLE_TIME_MS>3424515</SESSION_IDLE_TIME_MS>
<SESSION_CPU_TIME_MS>125</SESSION_CPU_TIME_MS>
<SESSION_LAST_COMMAND>DISCOVER_XML_METADATA</SESSION_LAST_COMMAND>
<SESSION_LAST_COMMAND_CPU_TIME_MS>109</SESSION_LAST_COMMAND_CPU_TIME_MS>
</rowsetTable>
<rowsetTable>
<SESSION_ID>D241E8DB-6B59-4A65-9B61-017B159CB51D</SESSION_ID>
<SESSION_SPID>1106</SESSION_SPID>
<SESSION_CONNECTION_ID>55</SESSION_CONNECTION_ID>
<SESSION_USER_NAME>THINKER\ChenXizhang</SESSION_USER_NAME>
<SESSION_CURRENT_DATABASE>Adventureworks</SESSION_CURRENT_DATABASE>
<SESSION_START_TIME>2009-06-25T23:46:40+08:00</SESSION_START_TIME>
<SESSION_ELAPSED_TIME_MS>3404468</SESSION_ELAPSED_TIME_MS>
<SESSION_LAST_COMMAND_START_TIME>2009-06-25T23:46:40+08:00</SESSION_LAST_COMMAND_START_TIME>
<SESSION_LAST_COMMAND_END_TIME>2009-06-25T23:46:40+08:00</SESSION_LAST_COMMAND_END_TIME>
<SESSION_LAST_COMMAND_ELAPSED_TIME_MS>0</SESSION_LAST_COMMAND_ELAPSED_TIME_MS>
<SESSION_IDLE_TIME_MS>0</SESSION_IDLE_TIME_MS>
<SESSION_CPU_TIME_MS>0</SESSION_CPU_TIME_MS>
<SESSION_LAST_COMMAND>MDSCHEMA_DIMENSIONS</SESSION_LAST_COMMAND>
<SESSION_LAST_COMMAND_CPU_TIME_MS>0</SESSION_LAST_COMMAND_CPU_TIME_MS>
</rowsetTable>
<rowsetTable>
<SESSION_ID>5A4AEF84-10F8-42BF-A0A4-87652233D2D5</SESSION_ID>
<SESSION_SPID>1000</SESSION_SPID>
<SESSION_CONNECTION_ID>42</SESSION_CONNECTION_ID>
<SESSION_USER_NAME>THINKER\ChenXizhang</SESSION_USER_NAME>
<SESSION_CURRENT_DATABASE>Adventureworks</SESSION_CURRENT_DATABASE>
<SESSION_START_TIME>2009-06-25T23:41:37+08:00</SESSION_START_TIME>
<SESSION_ELAPSED_TIME_MS>3707515</SESSION_ELAPSED_TIME_MS>
<SESSION_LAST_COMMAND_START_TIME>2009-06-26T00:06:49+08:00</SESSION_LAST_COMMAND_START_TIME>
<SESSION_LAST_COMMAND_END_TIME>2009-06-26T00:06:49+08:00</SESSION_LAST_COMMAND_END_TIME>
<SESSION_LAST_COMMAND_ELAPSED_TIME_MS>0</SESSION_LAST_COMMAND_ELAPSED_TIME_MS>
<SESSION_IDLE_TIME_MS>0</SESSION_IDLE_TIME_MS>
<SESSION_CPU_TIME_MS>0</SESSION_CPU_TIME_MS>
<SESSION_LAST_COMMAND>DISCOVER_PROPERTIES</SESSION_LAST_COMMAND>
<SESSION_LAST_COMMAND_CPU_TIME_MS>0</SESSION_LAST_COMMAND_CPU_TIME_MS>
</rowsetTable>
<rowsetTable>
<SESSION_ID>072281F3-BE2C-4670-B614-C0FD9B3D2D43</SESSION_ID>
<SESSION_SPID>2256</SESSION_SPID>
<SESSION_CONNECTION_ID>97</SESSION_CONNECTION_ID>
<SESSION_USER_NAME>THINKER\ChenXizhang</SESSION_USER_NAME>
<SESSION_CURRENT_DATABASE>Adventureworks</SESSION_CURRENT_DATABASE>
<SESSION_START_TIME>2009-06-26T00:43:24+08:00</SESSION_START_TIME>
<SESSION_ELAPSED_TIME_MS>31</SESSION_ELAPSED_TIME_MS>
<SESSION_LAST_COMMAND_START_TIME>2009-06-26T00:43:24+08:00</SESSION_LAST_COMMAND_START_TIME>
<SESSION_LAST_COMMAND_END_TIME>2009-06-26T00:43:24+08:00</SESSION_LAST_COMMAND_END_TIME>
<SESSION_LAST_COMMAND_ELAPSED_TIME_MS>0</SESSION_LAST_COMMAND_ELAPSED_TIME_MS>
<SESSION_IDLE_TIME_MS>0</SESSION_IDLE_TIME_MS>
<SESSION_CPU_TIME_MS>15</SESSION_CPU_TIME_MS>
<SESSION_LAST_COMMAND>DISCOVER_SESSIONS</SESSION_LAST_COMMAND>
<SESSION_LAST_COMMAND_CPU_TIME_MS>0</SESSION_LAST_COMMAND_CPU_TIME_MS>
</rowsetTable>
</NewDataSet>