如果您需要返回 DataSet ，而您只需要 DataTable ，则可以添加 DataTable 到虚拟 DataSet 并返回。这是一个例子：

If you need to return a DataSet, and all you have is a DataTable, you can add the DataTable to a dummy DataSet and return that. Here''s an example:

public DataSet DoSomething()
{
  DataTable people = GetPeopleWhoMatchSomeCriteria();
  DataSet dummySet = new DataSet();
  dummySet.Tables.Add(people);
  return dummySet;
}

另一种方法是将返回类型从 DataSet 更改为 DataTable 。

The alternative is to change the return type from DataSet to DataTable.

你不能将DataTable转换为DataSet。

you can''t cast a DataTable to DataSet.