Shulou(Shulou.com)06/02 Report--

Editor to share with you how to use C# to read files is more efficient, I believe that most people do not understand, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Usually we use C# to read a file using the following steps:

1. Declare and instantiate a file stream object using File's OpenRead, like this

FileStream fs = File.OpenRead (filename)

Or

FileStream fs = FileStream (filename, FileMode.Open, FileAccess.Read, FileShare.Read)

2. Prepare a byte array to store the contents of the file, and fs.Length will get the actual size of the file, like the following

Byte [] data = new byte [fs.Length]

3. Wow! Start to read, call a method of a file stream to read the data into the data array

Fs.Read (data, 0, data.Length)

It is so concise that we can read out the contents of the document intact after only 3 sentences. Can this code really work as you expected? The answer is: almost yes! The above code works well in most cases, but we should note that the Read method has a return value, and since there is a return value, it must make sense, if written as above, it can be a function with no return value. I think the purpose of the return value is to give us a chance to determine the size of the actual read file, and thus to determine whether the file has been fully read. So the above code does not guarantee that we have read all the bytes in the file (although in many cases we have). The following method provides a more secure method than the one above to ensure that the file is fully read

Public static void SafeRead (Stream stream, byte [] data) {int offset=0; int remaining = data.Length; / / keep reading while (remaining > 0) {int read = stream.Read (data, offset, remaining) as long as there are remaining bytes; if (read)

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