GDI+ 中发生一般性错误，将非 png 图像从 Fileupoad FileBytes 保存到 MemoryStream

Question

我已经应用了此处推荐的 GDI+ 错误解决方案：

A generic error occurred in GDI+, JPEG Image to MemoryStream

我仍然不适用于 jpeg 和 jpg 文件，但适用于所有 png

查看下面我的实际代码：

            Dim fl = uploader.PostedFile.FileName.ToLower

            If fl.EndsWith(".png") OrElse fl.EndsWith(".jpeg") OrElse fl.EndsWith(".jpg") Then
                Using ms = New MemoryStream(uploader.FileBytes)
                    Using i = Drawing.Image.FromStream(ms)
                        i.Save(ms, If(fl.EndsWith(".png"), System.Drawing.Imaging.ImageFormat.Png, System.Drawing.Imaging.ImageFormat.Jpeg))
                        Dim sig = Convert.ToBase64String(ms.ToArray())
                        Dim code = Trim(txtStaff.Text).PadLeft("00000000")
                        DB.rw_signature_save(code, sig)
                    End Using
                End Using

                BuildSignatureList()

                statusBox.Attributes("class") = "notification success"
                statusBox.InnerHtml = "Signature updated succesfully"
            Else
                statusBox.Attributes("class") = "notification warning"
                statusBox.InnerHtml = "Only <b>Image</b> ( <font color='green'>.png, .jpg </font> ) files allowed."
            End If

请问除了上述链接之外，还有其他解决方案吗？谢谢

Answer 1

才发现这其实完全没有必要。我可以直接从 uploader.FileBytes 转到 Convert.ToBase64String

Dim sig = Convert.ToBase64String(uploader.FileBytes)

GDI+ 中发生一般性错误，将非 png 图像从 Fileupoad FileBytes 保存到 MemoryStream

A generic error occurred in GDI+, Saving non png image from Fileupoad FileBytes to MemoryStream

gdi+

memorystream

file-upload