Question

vb如何读取数据库一行数据？

Answer 1

'读取方法：

Imports System.IO
Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Me.ListBox1.Items.Clear()
Dim StrRed As StreamReader = New StreamReader("D:\111.txt", System.Text.Encoding.Default)

While Not StrRed.EndOfStream
Me.ListBox1.Items.Add(StrRed.ReadLine())
End While
StrRed.Dispose()

End Sub
End Class

'其它读写方法：

写入：

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim strR As New StreamWriter("D:\111.txt", True)'参数True表示 在原来的数据上面添加，如果为False这删除原来的数据 重新写入数据
strR.WriteLine(Me.TextBox2.Text)
strR.Dispose()
End Sub

读取：

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim strR As New StreamReader("D:\111.txt")

While Not strR.EndOfStream
Me.TextBox1.Text += strR.ReadLine() & vbCrLf
End While
strR.Dispose()
End Sub