怎么来使用datatable？

[woainin]

如果我用如下语句 创建一个datatable：employee
...
myDataAdapter.Fill(myDS，“employee”);
...
怎么来使用这个employee呢？例如查询之类的
有没有select * from datatable.employee 之类的？

[mathsword]

DataTable.Select 方法
获取 DataRow 对象的数组。
private static void GetRowsByFilter()
{

DataTable customerTable = new DataTable( "Customers" );
// Add columns
customerTable.Columns.Add( "id", typeof(int) );
customerTable.Columns.Add( "name", typeof(string) );

// Set PrimaryKey
customerTable.Columns[ "id" ].Unique = true;
customerTable.PrimaryKey = new DataColumn[] { customerTable.Columns["id"] };

// Add ten rows
for( int id=1; id<=10; id++ )
{
customerTable.Rows.Add(
new object[] { id, string.Format("customer{0}", id) } );
}
customerTable.AcceptChanges();

// Add another ten rows
for( int id=11; id<=20; id++ )
{
customerTable.Rows.Add(
new object[] { id, string.Format("customer{0}", id) } );
}

string strExpr;
string strSort;

strExpr = "id > 5";
// Sort descending by column named CompanyName.
strSort = "name DESC";
// Use the Select method to find all rows matching the filter.
DataRow[] foundRows =
customerTable.Select( strExpr, strSort, DataViewRowState.Added );

PrintRows( foundRows, "filtered rows" );

foundRows = customerTable.Select();
PrintRows( foundRows, "all rows" );
}

private static void PrintRows( DataRow[] rows, string label )
{
Console.WriteLine( "\n{0}", label );
if( rows.Length <= 0 )
{
Console.WriteLine( "no rows found" );
return;
}
foreach( DataRow r in rows )
{
foreach( DataColumn c in r.Table.Columns )
{
Console.Write( "\t {0}", r[c] );
}
Console.WriteLine();
}
}

[lincai]

DataRow[] rows = myDS.Table["employee"].Select("ID='"+ pId +"'");
得出来的是employee表字段ID和pId相同的所有记录