How can i assign Property System.IO.FileInfo.Length?
It is read only!
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SilverLight
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2Why do you need to? The `FileInfo` class exists for the purpose of _getting file information_, not manipulating it. -- So the answer is: you can't. You would have to create your own class for that. – Visual Vincent Apr 04 '16 at 22:22
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How can i write that class? – SilverLight Apr 04 '16 at 22:29
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1[`FileStream.SetLength`](https://msdn.microsoft.com/library/system.io.filestream.setlength.aspx) – user4003407 Apr 04 '16 at 22:30
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You can only mark one answer :). Go with Eli's, he was first to point it out. – Visual Vincent Apr 04 '16 at 22:52
2 Answers
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FileInfo.Length is used to get the size of a file, the only way to change a file size is by modifying it's content
Eli Perl
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9@MoonLight : But he's right. Now you're just being ungrateful. It's read-only. You cannot change it. Period. And I would still like to know _why_ you need to do this. – Visual Vincent Apr 04 '16 at 22:26
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1@MoonLight - I don't understand - what would be the purpose of removing the answer to "let other people answer"? It doesn't make any sense to do, especially if it's correct – Krease Apr 05 '16 at 01:24
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If you want to set a file's size programmatically you would have to write something to it. The simplest way would probably be to just fill it with zeros.
public void writeEmptyFile(string path, int size)
{
using(FileStream fs = new FileStream(path, System.IO.FileMode.Append, System.IO.FileAccess.ReadWrite))
{
fs.Write(new byte[size], 0, size);
}
}
This method will either A) write a new file containing null-bytes (the file will have the specified size), or B) if the file path already exists it will append the specified amount of null-bytes to that file, increasing it's size.
Visual Vincent
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