[英]how to filter a datagridview when a database is not being used
我可以将csv文件的内容读取到DataGridView1中,但无法从textbox2过滤数据。 我尝试了网上发现的其他内容,但到目前为止没有任何效果。 这就是我所拥有的:
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim fName As String = ""
OpenFileDialog1.InitialDirectory = "C:\"
OpenFileDialog1.Filter = "CSV Files (*.csv)|*.csv"
OpenFileDialog1.FilterIndex = 2
OpenFileDialog1.RestoreDirectory = True
If (OpenFileDialog1.ShowDialog() = Windows.Forms.DialogResult.OK) Then
fName = OpenFileDialog1.FileName
End If
Me.TextBox1.Text = fName
GetData(fName, DataGridView1, True)
End Sub
Private Sub GetData(ByVal Path As String, ByRef DG As DataGridView, Optional ByVal NoHeader As Boolean = False)
Dim Fields() As String
Dim Start As Integer = 1
If NoHeader Then Start = 0
If Not File.Exists(Path) Then
Return
End If
Dim Lines() As String = File.ReadAllLines(Path)
Lines(0) = Lines(0).Replace(Chr(34), "")
Fields = Lines(0).Split(",")
If NoHeader Then
For I = 1 To Fields.Count - 1
Fields(I) = Str(I)
Next
End If
For Each Header As String In Fields
DG.Columns.Add(Header, Header)
Next
For I = Start To Lines.Count - 1
Lines(I) = Lines(I).Replace(Chr(34), "")
Fields = Lines(I).Split(",")
DG.Rows.Add(Fields)
Next
End Sub
我只希望能够通过在textbox2中键入内容来过滤第5列(csv文件中没有列标题)。 任何帮助将不胜感激。 谢谢
不要将值添加到DGV
,而是使用DataTable
然后DGV
进行查询。 示例认为您有一个用于某些过滤器选择的组合框-它们是根据您的需要使用的其他方法。 但是,此方法要求您具有标题。
Private dt As New DataTable
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim fName As String = ""
OpenFileDialog1.InitialDirectory = "C:\"
OpenFileDialog1.Filter = "CSV Files (*.csv)|*.csv"
OpenFileDialog1.FilterIndex = 2
OpenFileDialog1.RestoreDirectory = True
If (OpenFileDialog1.ShowDialog() = Windows.Forms.DialogResult.OK) Then
fName = OpenFileDialog1.FileName
End If
Me.TextBox1.Text = fName
LoadData(fName)
FilterData(combobox1.Text, "some column name")
End Sub
Private Sub LoadData(ByVal Path As String)
Dim Fields() As String
Dim Start As Integer = 1
If NoHeader Then Start = 0
If Not File.Exists(Path) Then
Return
End If
Dim Lines() As String = File.ReadAllLines(Path)
Lines(0) = Lines(0).Replace(Chr(34), "")
Fields = Lines(0).Split(",")
For I = 1 To Fields.Count - 1
Fields(I) = Str(I)
Next
For Each Header As String In Fields
dt.Columns.Add(Header, Header)
Next
For I = Start To Lines.Count - 1
Lines(I) = Lines(I).Replace(Chr(34), "")
Fields = Lines(I).Split(",")
dt.Rows.Add(Fields)
Next
End Sub
Private Sub FilterData(filter As String, columnName as string)
Dim query = From dr As DataRow In dt.Rows Where dr(columnName).ToString = filter
DGV.DataSource = query
End Sub
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