[错误]空路径名称不合法 问题是我无法将图像插入Access数据库。哪条线是错误的。在此先感谢谁帮助我
此致 Fizul
Dim OpenFileDialog1 As New OpenFileDialog
Dim fsreader As New IO.FileStream(OpenFileDialog1.FileName,IO.FileMode.Open, IO.FileAccess.Read)
Dim breader As New IO.BinaryReader(fsreader)
Dim imgbuffer(fsreader.Length) As Byte
breader.Read(imgbuffer, 0, fsreader.Length)
fsreader.Close()
cnn.ConnectionString = "provider=microsoft.ace.oledb.12.0; data source = |datadirectory|\db1.accdb;"
cnn.Open()
Dim sql As String
sql = "insert into Table1 Values(" & TextBox1.Text & ",'" & imgbuffer.Length & "')"
Dim cmd As New OleDb.OleDbCommand(sql, cnn)
cmd.ExecuteNonQuery()
cmd.Dispose()
cnn.Close()
答案 0 :(得分:0)
问题在于前两行:
Dim OpenFileDialog1 As New OpenFileDialog
Dim fsreader As New IO.FileStream(OpenFileDialog1.FileName,IO.FileMode.Open, IO.FileAccess.Read)
您创建了一个OpenFileDialog实例,但您从未调用它的ShowDialog方法,因此FileName属性为Nothing。你需要这样的东西:
Using OpenFileDialog1 As New OpenFileDialog
If OpenFileDialog1.ShowDialog() = DialogResult.OK Then
Dim fsreader As New IO.FileStream(OpenFileDialog1.FileName,IO.FileMode.Open, IO.FileAccess.Read)
'remaining of code here
End If
End Using
Using
语句确保正确放置对话框。