如何使用AsEnumerable（）。OrderBy通過多個條件對DataTable進行排序？

Question

就像在TSQL中一樣：

select * from aTable where (aCondition) order by AnIntegerField desc, ADateField 

如何使用以下方法對數據表進行排序：

dt.AsEnumerable().OrderBy(--two conditions --)

Answer 1

您將首先使用OrderBy，然后使用ThenBy （用於升序）或ThenByDescending （用於降序）。

從Microsoft文檔：

    string[] fruits = { "grape", "passionfruit", "banana", "mango", 
                          "orange", "raspberry", "apple", "blueberry" };

    // Sort the strings first by their length and then 
    //alphabetically by passing the identity selector function.
    IEnumerable<string> query =
        fruits.OrderBy(fruit => fruit.Length).ThenBy(fruit => fruit);

或對於VB（因為同時標記了問題）：

    ' Create an array of strings.
    Dim fruits() As String = _
        {"grape", "passionfruit", "banana", "mango", _
         "orange", "raspberry", "apple", "blueberry"}

    ' Sort the strings first by their length and then 
    ' alphabetically by passing the identity function.
    Dim query As IEnumerable(Of String) = _
        fruits _
        .OrderBy(Function(fruit) fruit.Length) _
        .ThenBy(Function(fruit) fruit)