SqlDataAdapter中的Fill方法(2)

      }
}
//SetupSchema 创建
internal void SetupSchema(SchemaType schemaType, string sourceTableName, bool gettingData, DataColumn parentChapterColumn, object parentChapterValue)
{
      MissingMappingAction action1;
      MissingSchemaAction action2;
      if (SchemaType.Mapped == schemaType)
      {
            action1 = this.adapter.MissingMappingAction;//确定传入数据没有匹配的表或列时需要执行的操作
            action2 = this.adapter.MissingSchemaAction;//确定现有 DataSet 架构与传入数据不匹配时需要执行的操作。
            if (!ADP.IsEmpty(sourceTableName))
            {
                  this.tableMapping = this.adapter.GetTableMappingBySchemaAction(sourceTableName, sourceTableName, action1);//创建源表和 DataTable 之间的主映射。
                  goto Label_016D;
            }
            if (this.dataTable == null)
            {
                  goto Label_016D;
            }
            int num1 = this.adapter.IndexOfDataSetTable(this.dataTable.TableName);
            if (-1 != num1)
            {
                  this.tableMapping = this.adapter.TableMappings[num1];
                  goto Label_016D;
            }
            switch (action1)
            {
                  case MissingMappingAction.Passthrough://创建源列或源表，并使用其原始名称将其添加到 DataSet。
                  {
                        this.tableMapping = new DataTableMapping(this.dataTable.TableName, this.dataTable.TableName);
                        goto Label_016D;
                  }
                  case MissingMappingAction.Ignore://忽略没有映射的列或表。
                  {
                        this.tableMapping = null;
                        goto Label_016D;
                  }
                  case MissingMappingAction.Error://缺少指定的列映射，则生成 InvalidOperationException
                  {
                        throw ADP.MissingTableMappingDestination(this.dataTable.TableName);
                  }
            }
            throw ADP.InvalidMappingAction((int) action1);
      }
      if (SchemaType.Source != schemaType)
      {
            throw ADP.InvalidSchemaType((int) schemaType);
      }
      action1 = MissingMappingAction.Passthrough;
      action2 = MissingSchemaAction.Add;
      if (!ADP.IsEmpty(sourceTableName))
      {
            this.tableMapping = DataTableMappingCollection.GetTableMappingBySchemaAction(null, sourceTableName, sourceTableName, action1);
      }
      else if (this.dataTable != null)
      {
            int num2 = this.adapter.IndexOfDataSetTable(this.dataTable.TableName);
            if (-1 != num2)
            {
                  this.tableMapping = this.adapter.TableMappings[num2];
            }
            else
            {
                  this.tableMapping = new DataTableMapping(this.dataTable.TableName, this.dataTable.TableName);////创建源表和 DataTable 之间的主映射。
            }
      }
Label_016D:
      if (this.tableMapping != null)
      {
            if (this.dataTable == null)
            {
                  this.dataTable = this.tableMapping.GetDataTableBySchemaAction(this.dataSet, action2);使用action2的 值获取DataSet的当前 DataTable。可以查看msdn
                  if (this.dataTable == null)
   &

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