Question

我的winform中有一个文本框和一个datagridew。dgvw通过代码连接到一个sql数据库。我添加了一个代码来搜索textbox的textchange事件中的datagridview。问题是，假设我在文本框，dgvw立即显示结果，但在我完成搜索后，我用退格键清除文本框，当我点击表格上的任何按钮时，dgvw变空了！没有行或列。但是，当我点击文本框并键入内容时，它们会再次出现......我该怎么办？

Private Sub OffPo_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Try
            Dim cmd As New SqlCommand("select * from userandadmins", con)
            Dim adapter As New SqlDataAdapter(cmd)
            Dim table As New DataTable
            adapter.Fill(table)
            userdatagrid.DataSource = table
            Dim imm As New DataGridViewImageColumn
            imm = userdatagrid.Columns(0)
            imm.ImageLayout = DataGridViewImageCellLayout.Stretch
            userdatagrid.Columns(0).Width = 35
        Catch ex As Exception
        End Try
Private Sub filterdata(valuetosearch As String)
        Dim srq As String = "Select * from userandadmins where CONCAT(Title,FirstName,LastName,Phone,Mobile,Email,AccountType,Username,Password) like '%" & valuetosearch & "%' "
        Dim mycmd As New SqlCommand(srq, con)
        Dim adapter As New SqlDataAdapter(mycmd)
        Dim table As New DataTable
        adapter.Fill(table)
        userdatagrid.DataSource = table
    End Sub


Private Sub textbox1_textchanged
        filterdata(textbox1.text)
End Sub

在datagridview vb.net中搜索时出现问题

0 个答案: