导致“参数异常”的原因是什么？将位图保存到流时？

Question

谁能帮我解决下面的代码？我在第四行收到“参数异常”。内部异常什么都没有。

Using btm As Bitmap = Image.FromStream(importFile.InputStream)
    Using newImage As Bitmap = ResizeImage(btm, StoringSize)
        Dim stream As New MemoryStream
        newImage.Save(stream, Imaging.ImageFormat.Bmp) 'Argument exception occurred. Parameter is not valid
        StoringFilesHelper.SaveFile(fileName, stream, folderType)
    End Using
End Using

这段代码运行正常，没有任何异常：

Using btm As Bitmap = Image.FromStream(importFile.InputStream)
    Using newImage As Bitmap = ResizeImage(btm, StoringSize)
        'Dim stream As New MemoryStream
        'newImage.Save(stream, Imaging.ImageFormat.Jpeg)
        'StoringFilesHelper.SaveFile(fileName, Stream, folderType)

        Dim filePath As String = StoringFilesHelper.GetLocalPath(fileName, folderType)
        newImage.Save(filePath)
    End Using
End Using

终于，我明白了原因。 http://blog .lavablast.com/post/2007/11/29/The-Mysterious-Parameter-Is-Not-Valid-Exception.aspx 图像在 ResizeImage 方法中被处理。

Answer 1

尝试在没有此行的情况下运行代码：

StoringFilesHelper.SaveFile(fileName, stream, folderType)