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Does this item contain inappropriate content? Dymocks Children’s Charities History. Kindle Edition. Yes, I realize that it’s supposed to be ‘plain and simple’, but I need a 30, foot view of the landscape before I land upon it. Mensa 4M.
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The options were changed a bit in ASP. NET Core, here they are credits :. Use the System. NET Framework 4. If you need to add custom mappings you probably can use reflection to add mappings to the BCL MimeMapping class, it uses a custom dictionary that exposes this method, so you should invoke the following to add mappings never tested tho, but should prob.
Anyway, when using reflection to add MIME types, be aware that since you’re accessing a private field, its name might change or even be totally removed, so you should be extra cautious and add double checks and provide fail safe action for every step. I’ve found many mime types my application uses are not in the default Windows registry and others are in the registry but not in the list included with IIS. I’ve compiled a list from these locations and added a few others that we use.
EDIT: See most up-do-date version with contributions here , including an efficient and deterministic two-way mapping. Just to make Shimmy ‘s answer more clear:. I like the work that Samuel Neff did, but not the idea and overhead of creating a dictionary every time. I restructured things as a switch case. Yes you can’t iterate over it but in my case I only ever use it to quickly look up a value. Especially because it is done in a web service, the last thing I want is a bunch of overhead as the application prepares its structures.
The compiler will turn this into a hashed lookup and so it will be very fast. I’ve written a program to fetch and convert the Apache mime. It’s here. The actual output is this file but you might want to grab it and run it again in case the Apache file has been updated since I last ran this.
Use MimeTypeMap package, which provides a huge two-way mapping of file extensions to mime types and mime types to file extensions.
The resulting source code is over 30K characters so I can’t post it here, check it on Github. My take at those mimetypes, using the apache list, the below script will give you a dictionary with all the mimetypes.
You should not trust the file extension coming from client. Always check the file’s magic number. NET Core:. To get MIME type of a file extension refer to this file. You could use the table provided from Apache ‘s httpd. It should be trivial to map this into a function, dictionary, list, etc. There may be multiple common MIME types per file extension, so you should look at the requirements of your application, and see why you care about MIME types, what you want “to do” with them, etc.
Can you use file extensions to key the same behavior? Do you need to read the first few bytes of a file to determine its MIME type as well? If you do not want to add additional dependencies and still want version-independent requests, you can mix this answer on how to get the MIME-Type in different.
NET versions with this answer on conditional builds for multiple. NET Framework versions. First thing I did was editing my project file. After the last build definition, I added the property group as stated in the second answer:. Now I provided a different implementations for the MimeExtensionHelper from the first answer, with an additional one for all clients from. NET 4. GetMimeMapping :. Also in the versions prior to.
It is always not necessary that the mime type calculated by the extention of the file will be always right. So in this case the file which you will be calculating, will give a different result Bryan Denny’s post above is not working for me since not all extensions have a “Content Type” sub-key in the registry.
I had to tweak the code as follows:. Now it works fine for me for all registered file types and un-registered or generic file types like JPG, etc. I have compiled a list of reputable sources for mime type and content type values that are keyed solely on file extension currently. For example, if I rename a file from mypicture.
Its very informative! Code wise, each of the above links has a. Certainly, for combining the advantage of common completeness, dynamics and portability with minimum dependency. FileExtension handle the file extension and not the Mime. The user can change the file extension, so check the Mime. The codes examples associate Mime by file extension, this is wrong and does not work.
Need to get the contenttype file and check if the table Mime contetType this file according to the file extension. Now, how to get the ContentType of the file? Using FileUpload is thus: FileUpload. You can use MimeMappings class. I think this is the easiest way. I give import of MimeMappings too. Stack Overflow for Teams — Start collaborating and sharing organizational knowledge. Create a free Team Why Teams? Learn more about Teams. Asked 13 years, 1 month ago.
Modified 3 months ago. Viewed k times. Improve this question. Yuki, thanks for adding new relevant info. Unfortunately the MS implementation, which is available in. Oddly, the MS listing is missing extremely common MS extensions even, like. Add a comment. Sorted by: Reset to default. Highest score default Trending recent votes count more Date modified newest first Date created oldest first. For ASP. TryGetContentType fileName, out contentType ; vNext only Never tested, but looks like you can officially expand the mime types list via the exposed Mappings property.
NET Framework For. GetMimeMapping fileName ; If you need to add custom mappings you probably can use reflection to add mappings to the BCL MimeMapping class, it uses a custom dictionary that exposes this method, so you should invoke the following to add mappings never tested tho, but should prob. AddMapping string fileExtension, string mimeType. Improve this answer. Shimmy Weitzhandler Shimmy Weitzhandler My listing above has mappings.
SamuelNeff You can of course add mappings using reflection MimeMapping. They’re more likely to change in the future since it’s not an agreed upon contract and you’ll get a runtime error instead of a compile-time error if that happens. If you are going to do this, you should at least add unit tests for it to be sure to catch it early when upgrading. NET versions. Besides that, if you’re going to add mappings manually, you might as well maintain your own collection. The class is nothing more than a wrapper on a dictionary.
You just won’t get errors anymore. We can disagree and argue, bottom line is you’re right you can technically call it through reflection, but personally I would never recommend using reflection on private properties in a production application unless it was absolutely necessary and without proper safeguards to catch it early if it fails.
FWIW, System. Web has been removed from ASP.