Question

美好的一天我是vb.net编程的初学者，我遇到了使用文本框搜索或过滤datagridview的问题。我有一个用于搜索的文本框和一个用于检索学生和车辆的值的两个按钮。单击学生按钮时，会显示学生的数据并且车辆的数据相同，但是当我移动＆＃34; Dim dtaset As New DataTable＆＃34;在学生，车辆和搜索文本的事件之外，搜索成功过滤数据值的数据，移动后也是一个问题，当点击按钮时，它会在datagridview中添加该按钮的数据，但是当第一个按钮点击后按钮数据未替换前一个，它只会添加将扩展datagrid列的列。这是我的代码，谢谢你提前

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

将数据集绑定到数据网格后，您可以尝试以下代码段：

Dim dv As DataView

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

使用文本框VB.net在Datagridview中搜索

1 个答案: