获取DataTable中指定列的数据

/// <summary>  
/// 获取DataTable中指定列的数据  
/// </summary>  
/// <param name="dt">数据源</param>  
/// <param name="tableName">新的DataTable的名词</param>  
/// <param name="strColumns">指定的列名集合</param>  
/// <returns>返回新的DataTable</returns>  
public static DataTable GetTableColumn(DataTable dt, string tableName, params string[] strColumns)  
{  
    DataTable dtn = new DataTable();  
    if (dt == null)  
    {  
        throw new ArgumentNullException("参数dt不能为null");  
    }  
    try  
    {  
        dtn = dt.DefaultView.ToTable(tableName, true, strColumns);  
    }  
    catch (Exception e)  
    {  
        throw new Exception(e.Message);  
    }  
    return dtn;  
}