[英]Listview - select mosti similar item to value
如何在列表視圖(第一列)中選擇一個最類似於標簽或文本框中的字符串值的項目。
Listview填充以下代碼:
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
ListView1.Items.Clear()
ListView1.View = System.Windows.Forms.View.Details
ListView1.Columns.Add("COL1", 100, HorizontalAlignment.Left) 'KONTO
ListView1.Columns.Add("COL2", 140, HorizontalAlignment.Left) 'NAZIV
Dim FilePath As String = "W:\GLAVNI\KOR14\"
Dim DBF_File As String = "MATIKGL"
Dim ColName As String = "KONTO"
'Dim naz As String
Using con As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & FilePath & _
" ;Extended Properties=dBASE IV")
con.Open()
Using cmd As New OleDbCommand("SELECT * FROM MATIKGL ORDER BY KONTO, NAZIV", con)
Using reader As OleDbDataReader = cmd.ExecuteReader()
If reader.HasRows Then
While (reader.Read())
Me.ListView1.Items.Add(reader("KONTO"))
'ListView1.Items(i).SubItems.Add(rdr.Item("YourColumnName").ToString)
'BELOW SELECTS ALL ITEMS THAT STARTS WITH 2020-
For i = 0 To ListView1.Items.Count - 1
If ListView1.Items(i).ToString.Contains("2020-") Then
Else
ListView1.Items.Remove(ListView1.Items(i))
End If
Next
End While
Else
End If
End Using
End Using
con.Close()
End Using
End Sub
我有一個文本框和一個按鈕。 來自文本框的文本輸入應與列表視圖中的所有項目進行比較,並應選擇最接近的項目。 還有一件事:所有項目均按字母順序排序
按鈕代碼為:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
ListView1.MultiSelect = False
ListView1.FullRowSelect = True
Dim checkInt As Integer = FindItem(ListView1, "2020-" & TextBox1.Text)'this one is changed since all items starts with "2020-"& UCASE TEXT
If checkInt <> -1 Then
ListView1.Items(checkInt).Selected = True
ListView1.Focus()
Else
Label1.Text = "Search string not found"
End If
End Sub
更新的代碼
Dim checkInt As Integer = FindItem(ListView1, "2020-" & TextBox3.Text)
If checkInt <> -1 Then
TextBox4.Focus()
Else
Label14.Text = "NEMA"
On Error GoTo ext
Dim li As ListViewItem
ListView1.SelectedItems.Clear()
ListView1.HideSelection = False
li = ListView1.FindItemWithText("2020-" & UCase(TextBox3.Text))
If Not (li Is Nothing) Then
Me.ListView1.Focus()
li.Selected = True
li.EnsureVisible()
ElseIf li Is Nothing Then
li = ListView1.FindItemWithText("2020-" & Strings.Left(TextBox3.Text, 1))
Me.ListView1.Focus()
li.Selected = True
li.EnsureVisible()
Else
End If
Exit Sub
ext:
TextBox3.Text = ""
TextBox3.Focus()
Label14.Text = "String not found"
End If
這個作品。
我知道這不是最好的解決方案,但它正在起作用。 可以在沒有您幫助的情況下解決此問題,謝謝Phillip Trelford
定義一個函數來對兩個字符串的緊密度進行評分,然后使用LINQ查找最低得分,即
' Example score function
Function Score(a As String, b As String) As Integer
Dim index = 0
While index < a.Length And index < b.Length
Dim diff = Math.Abs(AscW(a(index)) - AscW(b(index)))
If diff <> 0 Then Return diff
index += 1
End While
Return Math.Abs(a.Length - b.Length)
End Function
Function Closest(searchWord As String, words As String()) As String
Dim ordered =
From w In words
Select Word = w, Score = Score(w, searchWord)
Order By Score
Return ordered.First().Word
End Function
Sub Main()
Dim words = {"Alpha", "Apple", "Ask"}
Dim searchWord = "Ann"
Dim word = Closest(searchWord, words)
Console.WriteLine(word)
End Sub
更新資料
要在WinForms ListView中選擇值,您需要大致執行以下操作:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
ListView1.MultiSelect = False
ListView1.FullRowSelect = True
Dim prefix = "2020-"
' Extract items from Listview
Dim items = New List(Of String)()
For Each item In ListView1.Items
items.Add(item)
Next
Dim words = items.ToArray()
Dim searchWord = TextBox1.Text
Dim resultWord = Closest(searchWord, words)
'this one is changed since all items starts with "2020-"& UCASE TEXT
Dim checkInt As Integer = FindItem(ListView1, prefix & resultWord)
If checkInt <> -1 Then
ListView1.Items(checkInt).Selected = True
ListView1.Focus()
Else
Label1.Text = "Search string not found"
End If
End Sub
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