從sql server數據庫插入和顯示圖像在vb.net

Question

我需要上傳和顯示圖像數據庫。我已經寫了這個代碼上傳，它上傳的罰款。除了1個問題。它崩潰時，我不選擇一個圖像。有人可以幫我解決它的空值？你怎麼在IE中顯示圖像？用於插入圖像

代碼 -

Dim imageInfo As FileInfo = Nothing 
Dim data() As Byte = Nothing 
imageInfo = New FileInfo(Me.UploadLogo.Value.Trim()) 
Dim imagestream As FileStream = New FileStream(imageInfo.ToString, FileMode.Open) 

if name_id > 0 
    ReDim data(imagestream.Length - 1) 
    imagestream.Read(data, 0, imagestream.Length) 
    imagestream.Close() 
    Sqlstr = "UPDATE logos WITH(ROWLOCK) " & _ 
      "SET Logo=@Logo,Modified_Date=GETDATE() " & _ 
      "WHERE ID = " + name_id.ToString + "" 
Else 
    Sqlstr = "INSERT logos (Logo,Created_Date) " & _ 
      "VALUES ("@Logo,GETDATE())" 
End If 

SqlCmd = New SqlCommand(Sqlstr, SqlCnn) 
Dim pictureParameter As SqlParameter = Nothing 
pictureParameter = New SqlParameter("@Logo", SqlDbType.Image) 
pictureParameter.Value = data 
SqlCmd.Parameters.Add(pictureParameter) 
SqlCmd.ExecuteScalar() 

這隻有當一個圖像被選擇細，爲崩潰NULL值。 也請幫助我與圖像顯示。感謝

Answer 1

爲了解決你的「文件不選擇的問題」，你應該有沿線的If語句：

If Not File.Exists(Me.UploadLogo.Value.Trim()) 
    ' Exit out or handle no file selected 
End If