使用 DataView 浏览关系(From MSDN)
DataTable catTable = catDS.Tables["Categories"];
DataTable prodTable = catDS.Tables["Products"];
// Create a relation between the Categories and Products tables.
DataRelation relation = catDS.Relations.Add("CatProdRel",
catTable.Columns["CategoryID"],
prodTable.Columns["CategoryID"]);
// Create DataViews for the Categories and Products tables.
DataView catView = new DataView(catTable, "", "CategoryName",
DataViewRowState.CurrentRows);
DataView prodView;
// Iterate through the Categories table.
foreach (DataRowView catDRV in catView)
{
Console.WriteLine(catDRV["CategoryName"]);
// Create a DataView of the child product records.
prodView = catDRV.CreateChildView(relation);
prodView.Sort = "ProductName";
foreach (DataRowView prodDRV in prodView)
Console.WriteLine("\t" + prodDRV["ProductName"]);
}