使用两个数组进行输出

Question

我想弄清楚如何根据列表框对象中的 selection 输出结果。就像我 select “2002”，我希望它输出那一年的总降雨量。我已经尝试通过堆栈和 google 进行研究，但我似乎找不到任何东西，除非我解释不正确。我希望数组根据它们的索引输出。这是必要的代码。

Public Class frmRainfall

    ' Class level Variables

    Dim strYearSelection() As String = {
        "2000", "2001", "2002", "2003", "2004", "2005", "2006", "2007", "2008", "2009",
        "2010", "2011", "2012", "2013", "2014", "2015", "2016", "2017"
    }

    Dim strYear As String

    ' Yearly stats found online due to issues finding text file

    Dim decYearlyRainfallTotals() As Decimal = {

        28.66, 37.56, 31.36, 41.78, 31.1, 35.44, 48.82, 38.95, 30.73, 38.44, 46.99,
        36.39, 48.26, 32.56, 48.5, 44.83, 45.18, 47.87
    }

    Dim intOneYearTotal As Integer
    Dim intOverallTotal As Integer
    Dim intAverage As Integer

    Private Sub frmRainfall_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        'The Form at load will read the text file (Unavailable, read comment
        ' at the end of the frmRainfall sub procedure) and fill the ListBox object with the
        'Year items.

        For Each strYear In strYearSelection
            lstSelectYear.Items.Add(strYear)
        Next
    End Sub

Answer 1

这就是你想要的

首先，获取所选年份

Dim selectedYr as String = Convert.ToString(lstSelectYear.Text)

获取所选年份的索引和该索引中的沉淀。

Dim precip as Decimal = Convert.ToDecimal(decYearlyRainfallTotals(Array.IndexOf(strYearSelection, selectedYr)))

我想推荐一个不同的数据结构。键值对字典。它为您提供了您的月份和预付款之间的关系。

Dim dict as new Dictionary(Of String, String)

添加一条记录：

dict.Add("2000", 28.66)

获取所有年份

Dim allYears() as String = dict.Keys.ToArray()

获取一年的价值

Dim value as String = dict("2000")

使用两个数组进行输出

Using two arrays for output

vb.net

arrays

listbox

selectedindex