C#的问题?

DirectoryInfo sddirinfo = new DirectoryInfo("c:\\");
FileInfo [] sdsysinfo = sddirinfo.GetFiles();

FileInfo sdfi;DirectoryInfo sddi;

DirectoryInfo sddirinfo = new DirectoryInfo(sddir);
foreach(FileSystemInfo sdsysinfo in sddirinfo.GetFileSystemInfos())
{sdfilename = "";sdfileext = "";sdfilesize = 0;
if(sdsysinfo is FileInfo)

{sdfi = (FileInfo)sdsysinfo;
sdfilename = sdfi.Name;
sdfileext = sdfi.Extension;
sdfilesize = sdfi.Length;
sdfiletime = sdfi.CreationTime;

每句什么意思?

DirectoryInfo sddirinfo = new DirectoryInfo("c:\\");//定义DirectoryInfo变量，并指向C:\
FileInfo [] sdsysinfo = sddirinfo.GetFiles();//获得C:\下的文件，并存入FileInfo类型数组

FileInfo sdfi;DirectoryInfo sddi;

DirectoryInfo sddirinfo = new DirectoryInfo(sddir);
foreach(FileSystemInfo sdsysinfo in sddirinfo.GetFileSystemInfos())
{sdfilename = "";sdfileext = "";sdfilesize = 0;
if(sdsysinfo is FileInfo)

{sdfi = (FileInfo)sdsysinfo;
sdfilename = sdfi.Name;//获得文件名称
sdfileext = sdfi.Extension;//获得文件扩展名
sdfilesize = sdfi.Length;//获得文件大小
sdfiletime = sdfi.CreationTime;//获得文件创建日期

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