PS：調(diào)試的時候在“命令行參數(shù)”屬性中，輸入“..\..\Test.txt”，便可以將與源代碼（indexer.cs）所在目錄下的Test.txt文件中的字節(jié)反轉(zhuǎn)。或者將編譯好的exe在cmd中輸入“indexer Test.txt”也可。
這個范例也提供了按照字節(jié)訪問文件的方法（類FileByteArray），收藏收藏了，

---

Demo

//Copyright(C)MicrosoftCorporation.Allrightsreserved.

//indexer.cs
//arguments:indexer.txt
usingSystem;
usingSystem.IO;

//Classtoprovideaccesstoalargefile
//asifitwereabytearray.
publicclassFileByteArray
{
Streamstream;//Holdstheunderlyingstream
//usedtoaccessthefile.
//CreateanewFileByteArrayencapsulatingaparticularfile.
publicFileByteArray(stringfileName)
{
stream=newFileStream(fileName,FileMode.Open);
}

//Closethestream.Thisshouldbethelastthingdone
//whenyouarefinished.
publicvoidClose()
{
stream.Close();
stream=null;
}

//Indexertoprovideread/writeaccesstothefile.
publicbytethis[longindex]//longisa64-bitinteger
{
//Readonebyteatoffsetindexandreturnit.
get
{
byte[]buffer=newbyte[1];
stream.Seek(index,SeekOrigin.Begin);
stream.Read(buffer,0,1);
returnbuffer[0];
}
//Writeonebyteatoffsetindexandreturnit.
set
{
byte[]buffer=newbyte[1]{value};
stream.Seek(index,SeekOrigin.Begin);
stream.Write(buffer,0,1);
}
}

//Getthetotallengthofthefile.
publiclongLength
{
get
{
returnstream.Seek(0,SeekOrigin.End);
}
}
}

//DemonstratetheFileByteArrayclass.
//Reversesthebytesinafile.
publicclassReverse
{
publicstaticvoidMain(String[]args)
{
//Checkforarguments.
if(args.Length!=1)
{
Console.WriteLine("Usage:Indexer<filename>");
return;
}

//Checkforfileexistence
if(!System.IO.File.Exists(args[0]))
{
Console.WriteLine("File"+args[0]+"notfound.");
return;
}

FileByteArrayfile=newFileByteArray(args[0]);
longlen=file.Length;

//Swapbytesinthefiletoreverseit.
for(longi=0;i<len/2;++i)
{
bytet;

//Notethatindexingthe"file"variableinvokesthe
//indexerontheFileByteStreamclass,whichreads
//andwritesthebytesinthefile.
t=file[i];
file[i]=file[len-i-1];
file[len-i-1]=t;
}

file.Close();
}
}

總結(jié)

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