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PO
primarykey
Id
7957634
data
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0
AnswerCount
0
ClosedDate
CommentCount
7
CommunityOwnedDate
CreationDate
2011-10-31T17:56:17.420
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LastActivityDate
2016-07-04T17:01:32.227
LastEditDate
2016-07-04T17:01:32.227
LastEditorUserId
22656
OwnerUserId
22656
ParentId
7957544
PostTypeId
2
Score
7
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0
LastEditorDisplayName
text
Body
Rather than "always write to the oldest" you can use the "safe file write" technique of: (Assuming you want to end up saving data to <code>foo.data</code>, and a file with that name contains the previous valid version.) <ul> <li>Write new data to <code>foo.data.new</code></li> <li>Rename <code>foo.data</code> to <code>foo.data.old</code></li> <li>Rename <code>foo.data.new</code> to <code>foo.data</code></li> <li>Delete <code>foo.data.old</code></li> </ul> At any one time you've always got at least one valid file, and you can tell which is the one to read just from the filename. This is assuming your file system treats rename and delete operations atomically, of course. <ul> <li>If <code>foo.data</code> and <code>foo.data.new</code> exist, load <code>foo.data</code>; <code>foo.data.new</code> may be broken (e.g. power off during write)</li> <li>If <code>foo.data.old</code> and <code>foo.data.new</code> exist, both should be valid, but something died very shortly afterwards - you may want to load the <code>foo.data.old</code> version anyway</li> <li>If <code>foo.data</code> and <code>foo.data.old</code> exist, then <code>foo.data</code> should be fine, but again something went wrong, or possibly the file couldn't be deleted.</li> </ul> Alternatively, simply always write to a new file, including some sort of monotonically increasing counter - that way you'll never lose any data due to bad writes. The best approach depends on what you're writing though. You could also use <a href="https://msdn.microsoft.com/en-us/library/system.io.file.replace" rel="nofollow"><code>File.Replace</code></a> for this, which basically performs the last three steps for you. (Pass in <code>null</code> for the backup name if you don't want to keep a backup.)
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1. POHow to ensure that data doesn't get corrupted when saving to file?
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1. USJon Skeet
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1. USJon Skeet
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