如何在VB .net中对数据集进行排序

Question

I am working on a code, where i need to sort the data received in dataset through database by date (which later is exported in the excel sheet and data should be sorted in the excel sheet by date).

Following is the code snippet i used to sort.

Dim ds As DataSet
Dim dte As DataTable = ds.Tables(0).DefaultView.ToTable()
       dte.DefaultView.Sort = "DATE_START ASC" // Using this to sort
       dte.DefaultView.ToTable()

dte.DefaultView.Sort = "DATE_DUE ASC" is returning the true value, but still dte returns unsorted data. Not sure whats wrong here. Is there any alternate approach to sort the data by date?

Answer 1

试试这个 ORDER BY

dte.DefaultView.Sort = "ORDER BY DATE_START ASC" 

Answer 2

您可以使用 DataTable.Select （ 文档）在过滤器表达式中不传递任何内容，在排序中您的列，然后对结果调用 CopyToDataTable （ 文档）：

Dim dte = ds.Tables(0).Select("", "DATE_START ASC").CopyToDataTable()

Answer 3

You are already sorting the data correctly, so you must just be accessing it incorrectly.

'Don't create a DataSet that you don't need.
'If all you need is a DataTable, create a DataTable.
Dim table As New DataTable

'Configure and populate table here.

'Sort the associated view.
table.DefaultView.Sort = "DATE_START"

'This will display the data unsorted, because the DataTable itself is not sorted.
For Each row As DataRow in table.Rows
    Console.WriteLine($"{row("ID")}, {row("DATE_START"}")
Next

'This will display the data sorted.
For Each view As DataRowView in table.DefaultView
    Console.WriteLine($"{view("ID")}, {view("DATE_START"}")
Next