Write all bits in C#

How can i write all bits of a file开发者_如何学编程 using c#? For example writing 0 to all bits

Please provide me with a sample

I'm not sure why you'd want to do this, but this will overwrite a file with data that is the same length but contains byte values of zero:

File.WriteAllBytes(filePath, new byte[new FileInfo(filePath).Length]);

Definitely has the foul stench of homework to it.

Hint - Think why someone might want to do this. Just deleting the file and replacing with a file of 0s of the correct length might not be what you're after.

Have a look at System.IO.FileInfo; you'll need to open a writable stream for the file you're interested in and then write however many bytes (with value 0 in your example) to it as there are in the file already (which you can ascertain via FileInfo.Length). Be sure to dispose of the stream once you're done with it – using constructs are useful for this purpose.

Consider using the BinaryWriter available in the .NET framework

using(BinaryWriter binWriter =
            new BinaryWriter(File.Open(fileName, FileMode.Create)))
        {
            binWriter.Write("Hello world");

        }

When you say write all bits to a file I'll assume you mean bits as in nyble, bit, byte. That's just writing an integer to a file. You can't have a 4 bit file as far as I know so the smallest denomination will be a byte.

You probably don't want to be responsible for serializing yourself, so your easiest option would be to use the BinaryReader and BinaryWriter classes, and then manipulate the bits inside your C#.

The BinaryWriter class uses a 4 byte integer as minimum however. For example

writer.Write( 1 ); // 01  
writer.Write( 10 ); // 0a  
writer.Write( 100 ); // 64  
writer.Write( 1000 ); // 3e8  
writer.Write( 10000 ); // 2710  
//writer.Write( 123456789 ); // 75BCD15

is written to file as

01 00 00 00 0a 00 00 00 64 00 00 00 e8 03 00 00 10 27 00 00 15 cd 5b 07

read into a byte and then test against >= powers of 2 to get each of the bits in that byte