使用文本框 VB.net 在 Datagridview 中搜索

Question

美好的一天，我是 vb.net 编程的初学者，我在使用文本框搜索或过滤 datagridview 时遇到问题。我有一个用于搜索的文本框和一个用于检索学生和车辆值的两个按钮。当学生按钮单击时，显示学生的数据并且与车辆相同但是当我将“Dim dtaset As New DataTable”移动到学生事件之外时，车辆和searchtxt搜索成功过滤了数据值的数据也有问题移动后也是如此，当单击按钮时，它会在 datagridview 中添加该按钮的数据，但是当在第一个按钮之后单击另一个按钮时，数据不会替换前一个按钮，它只会添加将扩展 datagrid 列的列。这是我的代码提前谢谢你

Private Sub searchtxt_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles searchtxt.TextChanged
    con.ConnectionString = "server=localhost;userid=root;password=1234;database=dat"


    Dim dtaset As New DataTable

    Dim DV As New DataView(dtaset)
    DV.RowFilter = String.Format("FirstName Like '%{0}%'", searchtxt.Text)
    DataGridView1.DataSource = DV
End Sub

Public Sub studattenprint()
    con.ConnectionString = "server=localhost;userid=root;password=1234;database=dat"

    Dim adpter As New MySqlDataAdapter
    Dim dtaset As New DataTable
    Dim bsource As New BindingSource


    Try
        con.Open()
        Dim query As String
        query = "select idno as 'Student_ID',lastxt as 'LastName',firstxt as 'FirstName',middletxt as 'MiddleName',log as 'Status',timein as 'Timein',crse as 'Course',dates as 'Date' from dat.studdailyhistory"
        cmd = New MySqlCommand(query, con)

        adpter.SelectCommand = cmd
        adpter.Fill(dtaset)
        If dtaset.Rows.Count >= 0 Then
            numlog.Text = dtaset.Rows.Count.ToString()
        End If
        bsource.DataSource = dtaset
        DataGridView1.DataSource = bsource

        ''DataGridView Design
        DataGridView1.AllowUserToAddRows = False ' Disabled or hide (*) Symbol...

        DataGridView1.RowHeadersVisible = False 'To hide Left indicator..
        DataGridView1.DefaultCellStyle.SelectionBackColor = Color.SteelBlue  'Selection backcolor....
        DataGridView1.AlternatingRowsDefaultCellStyle.BackColor = Color.LightGoldenrodYellow 'Alternating Backcolor.
        DataGridView1.AllowUserToResizeRows = False 'Disabled  row resize...
        DataGridView1.ReadOnly = True
        DataGridView1.MultiSelect = False
        DataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect
        DataGridView1.ShowRowErrors = False
        DataGridView1.ShowCellErrors = False
        DataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells
        DataGridView1.Sort(DataGridView1.Columns(7), System.ComponentModel.ListSortDirection.Descending)

        adpter.Update(dtaset)
        con.Close()

    Catch ex As Exception
        MessageBox.Show(ex.Message)
    Finally
        con.Dispose()
    End Try
End Sub

Public Sub vehicattenprint()
    con = New MySqlConnection
    con.ConnectionString = "server=localhost;userid=root;password=1234;database=dat"
    Dim SDA As New MySqlDataAdapter
    Dim dtaset As New DataTable
    Dim bSource As New BindingSource


    Try

        con.Open()
        Dim query As String

        query = "select tag_no as 'Tag_No.',platenum as 'Plate no.',ownername as 'Owner_name',log as 'Status',timelog as 'Time_log',dates as 'Date' from dat.vehicdailyhistory"
        cmd = New MySqlCommand(query, con)
        SDA.SelectCommand = cmd
        SDA.Fill(dtaset)
        bSource.DataSource = dtaset
        DataGridView1.DataSource = bSource

        If dtaset.Rows.Count > 0 Then
            numlog.Text = dtaset.Rows.Count.ToString()
        End If

        SDA.Update(dtaset)
        DataGridView1.AllowUserToAddRows = False ' Disabled or hide (*) Symbol...

        DataGridView1.RowHeadersVisible = False 'To hide Left indicator..
        DataGridView1.DefaultCellStyle.SelectionBackColor = Color.SteelBlue  'Selection backcolor....
        DataGridView1.AlternatingRowsDefaultCellStyle.BackColor = Color.LightGoldenrodYellow 'Alternating Backcolor.
        DataGridView1.AllowUserToResizeRows = False 'Disabled  row resize...
        DataGridView1.ReadOnly = True
        DataGridView1.MultiSelect = False
        DataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect
        DataGridView1.ShowRowErrors = False
        DataGridView1.ShowCellErrors = False
        DataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells
        DataGridView1.Sort(DataGridView1.Columns(5), System.ComponentModel.ListSortDirection.Descending)

        con.Close()
    Catch ex As Exception
        MessageBox.Show(ex.Message)
    Finally
        con.Dispose()
    End Try
End Sub

Private Sub vehicatten_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles vehicatten.Click
    vehicattenprint()
End Sub

Private Sub studatten_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles studatten.Click
    studattenprint()
End Sub

Answer 1

将你的数据集绑定到datagrid后，可以试试下面的代码sn-p：

Dim dv As DataView

dv = New DataView(yourDataset.Tables(0), "YourDataColumnName= '" & Me.txtSearchBox.Text & "' ", "YourDataColumnName", DataViewRowState.CurrentRows)
Me.YourDataGridView.DataSource = dv