ASP.NET [ExternalException（0x80004005）：GDI +中发生一般错误。] at bitmap.Save（MStream，ImageFormat.Tiff）

Question

我已经阅读了数百个＆＃34; GDI +中出现了一般性错误＆＃34;帖子并不能完全解决问题。我试图插入一个页面，然后将一些文本应用到多页tiff的每个页面。

如果我只是想在不向每个页面添加任何其他文本的情况下插入页面，则无论多页tiff包含多少页面，此代码都能正常工作：

'yada yada yada
cover.Save(byteStream, ImageFormat.Tiff)
images.Add(Image.FromStream(byteStream))

'loop through each page of the multi-page tif
Dim count As Integer = bitmap.GetFrameCount(FrameDimension.Page)
            For idx As Integer = 0 To count - 1
                bitmap.SelectActiveFrame(FrameDimension.Page, idx)
                bitmap.Save(byteStream, ImageFormat.Tiff)
                images.Add(Image.FromStream(byteStream))
            Next

'some stuff to process and save a tif

这是我用来插入封面并为每个页面添加其他文字的代码。它似乎工作正常，除非多页tiff有超过20页：

'yada yada yada
cover.Save(byteStream, ImageFormat.Tiff)
images.Add(Image.FromStream(byteStream))

Dim stringFormat As StringFormat = New StringFormat()
stringFormat.Alignment = StringAlignment.Far

'loop through each page of the multi-page tif
Dim count As Integer = bitmap.GetFrameCount(FrameDimension.Page)
        For idx As Integer = 0 To count - 1

            bitmap.SelectActiveFrame(FrameDimension.Page, idx)

            Dim bitmap2 As New Bitmap(bitmap)
            bitmap2.SetResolution(300, 300)

            Dim g As Graphics = Graphics.FromImage(bitmap2)

            Select Case Trim(Type)
                Case Is = "X"
                    Dim rectf As New RectangleF(2100, 75, 300, 75)
                    g.DrawString(DocNum, New Font("Arial", 10), Brushes.Black, rectf, stringFormat)
                Case Is = "Y"
                    Dim rectf As New RectangleF(2100, 150, 300, 75)
                    g.DrawString(DocNum, New Font("Arial", 10), Brushes.Black, rectf, stringFormat)
            End Select

            bitmap2.Save(byteStream, ImageFormat.Tiff)

            images.Add(Image.FromStream(byteStream))

            g.Dispose()
            bitmap2.Dispose()

        Next

'some stuff to process and save a tif

我得到＆＃34; GDI +中发生了一般错误。＆＃34; ＆＃34; [ExternalException（0x80004005）：GDI +中发生了一般错误。]＆＃34; at bitmap2.Save（byteStream，ImageFormat.Tiff）一旦我点击第20张图片。关于问题是什么以及如何解决它的任何想法？它似乎不是文件权限问题。我尝试使用＆＃34;使用＆＃34;使用内存流结束＆＃34;而且似乎并不重要。我错过了一些明显的东西吗