如何搜索字典键的一部分？ [英] How to search for a part of a dictionary key?

问题描述

有人可以告诉我，我怎么只能在字典中（在VB.NET中）搜索键的一部分？

Could someone please tell me, how I can search for only a part of a key in a dictionary (in VB.NET)?

我使用以下示例代码：

    Dim PriceList As New Dictionary(Of String, Double)(System.StringComparer.OrdinalIgnoreCase)

    PriceList.Add("Spaghetti alla carbonara", 21.65)
    PriceList.Add("Spaghetti aglio e olio", 22.65)
    PriceList.Add("Spaghetti alla napoletana", 23.65)
    PriceList.Add("Spaghetti alla puttanesca ", 24.65)
    PriceList.Add("Spaghetti alla gricia ", 25.65)
    PriceList.Add("Spaghetti alle vongole", 26.65)
    PriceList.Add("Spaghetti Bolognese", 27.65)

    If PriceList.ContainsKey("spaghetti bolognese") Then
        Dim price As Double = PriceList.Item("spaghetti bolognese")
        Console.WriteLine("Found, price: " & price)
    End If

    If Not PriceList.ContainsKey("Bolognese") Then
        Console.WriteLine("How can I search for only a part of a key?")
    End If

如果我只知道键的一部分（例如博洛涅塞）或仅单词的一部分（例如 Bolo），如何在完整键中搜索这一部分？

If I only know a part of the key like "Bolognese" or just a part of word like "Bolo", how can I search for this part in the complete key?

推荐答案

您可以使用 Any（）

If Not PriceList.Where(Function(x) x.Key.Contains("Bolognese")).Any()
    Console.WriteLine("No Bolognese, sorry")
End If

要获取包含仅Bolognese：

To get a subset of the dictionary with keys containing "Bolognese" only:

Dim subsetOfDictionary = PriceList _ 
        .Where(Function(x) x.Key.Contains("Bolognese")) _ 
        .ToDictionary(Function(x) x.Key, Function(x) x.Value)

获取所有包含博洛涅塞的条目的价格列表：

To get the list of prices for all entries containing "Bolognese":

Dim pricesForAllThingsBolognese = PriceList _
        .Where(Function(x) x.Key.Contains("Bolognese")) _
        .Select(Function(x) x.Value) _
        .ToList()

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