参数无效。 - 只发生在 Gif 中
我有一些代码允许用户将图像上传到我的服务器。
它在几个月内运行良好，仅接受 PNG 和 JPEG，因为最初它用于照片。
现在我想用来上传横幅，所以我需要接受 gif，但每次我尝试上传 gif 时都会收到此错误。
"Parameter is not valid."
在这段代码上，
Bitmap myBitmap = new Bitmap(HttpContext.Current.Server.MapPath(_SavePath + imageFileName));
奇怪的是它对 PNG 和 JPEG 工作得很好，但对 GIF 却一点也不工作，
我已经在谷歌上搜索了几个小时，从我得到的信息来看，这个错误似乎很痛苦，而且不描述真正的问题。
有人可以帮忙吗？
谢谢特鲁吉利
I have some code that will allow a user to upload an image to my server.
its worked fine for months accepting just PNG and JPEG's, as initially it was used for photographs.
now I want uses to upload banners, so I need to accept gifs, but every time I try and upload a gif I get this error.
"Parameter is not valid."
on this bit of code
Bitmap myBitmap = new Bitmap(HttpContext.Current.Server.MapPath(_SavePath + imageFileName));
the weird thing is it works fine with PNG's and JPEG's bit not at all with GIF's
I've been googling for a few hours now and from what i get, it seems that this error is a pain and doesn't describe the real issue.
can anyone help ?
Thanks
Truegilly
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抛出的是哪种方法？ Bitmap的构造函数还是MapPath？
如果是位图：
您确定 GIF 有效吗？即使它不是 100% 符合规范，其他程序也可能能够读取它，但也许位图更加挑剔。
您是否尝试过许多不同的 GIF 文件并遇到此问题？
如果 MapPath：
GIF 的名称在传递到 MapPath 后是否无效？检查看看它是什么。
如果 GIF 可能不太好——您可以尝试我公司的产品，DotImage Photo，它是免费的。它有一个名为 AtalaImage 的类，您可以像 Bitmap 一样使用它，并且它可以读取可能不合规格的图像。
Which method is throwing? Bitmap's constructor or MapPath?
If Bitmap:
Are you sure the GIF is valid? Other programs might be able to read it even if it's not 100% to spec, but perhaps Bitmap is being more picky.
Have you tried many different GIF files and had this problem?
If MapPath:
Is the name of the GIF not valid once it gets passed to MapPath? Check to see what it is.
If the GIF is possibly not a good one -- you can try my company's product, DotImage Photo, which is free. It's got a class called
AtalaImagethat you can use like Bitmap and it can read images that might be off-spec.