C#获取文件夹文件的大小以及占用空间

//调用windows API获取磁盘空闲空间

//导入库

[DllImport(\

static extern bool GetDiskFreeSpace([MarshalAs(UnmanagedType.LPTStr)]string rootPathName,

ref int sectorsPerCluster, ref int bytesPerSector,

ref int numberOfFreeClusters, ref int totalNumbeOfClusters); ///

///

///

public static long GetDirectoryLength(string dirPath) {

long len = 0;

//判断该路径是否存在（是否为文件夹） if (!Directory.Exists(dirPath)) {

//查询文件的大小

len = FileSize(dirPath);

}

else {

//定义一个DirectoryInfo对象

DirectoryInfo di = new DirectoryInfo(dirPath);

//通过GetFiles方法，获取di目录中的所有文件的大小 foreach (FileInfo fi in di.GetFiles()) {

len += fi.Length;

}

//获取di中所有的文件夹，并存到一个新的对象数组中，以进行递归 DirectoryInfo[] dis = di.GetDirectories(); if (dis.Length > 0) {

for (int i = 0; i < dis.Length; i++) {

len += GetDirectoryLength(dis[i].FullName);

}

} }

return len; }

///

/// ///

public static long GetDirectorySpace(string dirPath) {

//返回值

long len = 0;

//判断该路径是否存在（是否为文件夹） if (!Directory.Exists(dirPath)) {

//如果是文件，则调用

len = FileSpace(dirPath); }

else {

//定义一个DirectoryInfo对象

DirectoryInfo di = new DirectoryInfo(dirPath); //本机的簇值

long clusterSize = GetClusterSize(di); //遍历目录下的文件，获取总占用空间

foreach (FileInfo fi in di.GetFiles()) {

//文件大小除以簇，余若不为0

if (fi.Length % clusterSize != 0) {

decimal res = fi.Length / clusterSize;

//文件大小除以簇，取整数加1。为该文件占用簇的值 int clu = Convert.ToInt32(Math.Ceiling(res)) + 1; long result = clusterSize * clu; len += result; }

else

{

//余若为0，则占用空间等于文件大小 len += fi.Length; } }

//获取di中所有的文件夹，并存到一个新的对象数组中，以进行递归 DirectoryInfo[] dis = di.GetDirectories(); if (dis.Length > 0) {

for (int i = 0; i < dis.Length; i++)

{

len += GetDirectorySpace(dis[i].FullName); } } }

return len; }

//所给路径中所对应的文件大小

public static long FileSize(string filePath)

{

//定义一个FileInfo对象，是指与filePath所指向的文件相关联，以获取其大小

FileInfo fileInfo = new FileInfo(filePath); return fileInfo.Length; }

//所给路径中所对应的文件占用空间

public static long FileSpace(string filePath) {

long temp = 0;

//定义一个FileInfo对象，是指与filePath所指向的文件相关联，以获取其大小

FileInfo fileInfo = new FileInfo(filePath); long clusterSize = GetClusterSize(fileInfo); if (fileInfo.Length % clusterSize != 0) {

decimal res = fileInfo.Length / clusterSize;

int clu = Convert.ToInt32(Math.Ceiling(res)) + 1; temp = clusterSize * clu; }

else {

return fileInfo.Length; }

return temp; }

public static DiskInfo GetDiskInfo(string rootPathName) {

DiskInfo diskInfo = new DiskInfo();

int sectorsPerCluster = 0, bytesPerSector = 0, numberOfFreeClusters = 0, totalNumberOfClusters = 0;

GetDiskFreeSpace(rootPathName, ref sectorsPerCluster, ref bytesPerSector, ref numberOfFreeClusters, ref totalNumberOfClusters);

//每簇的扇区数

diskInfo.SectorsPerCluster = sectorsPerCluster; //每扇区字节

diskInfo.BytesPerSector = bytesPerSector;

return diskInfo; }

////

public struct DiskInfo {

public string RootPathName; //每簇的扇区数

public int SectorsPerCluster; //每扇区字节

public int BytesPerSector;

public int NumberOfFreeClusters; public int TotalNumberOfClusters; }

///

/// ///

public static long GetClusterSize(FileInfo file) {

long clusterSize = 0;

DiskInfo diskInfo = new DiskInfo();

diskInfo = GetDiskInfo(file.Directory.Root.FullName); clusterSize = (diskInfo.BytesPerSector * diskInfo.SectorsPerCluster); return clusterSize; }

///

/// ///

public static long GetClusterSize(DirectoryInfo dir) {

long clusterSize = 0;

DiskInfo diskInfo = new DiskInfo();

diskInfo = GetDiskInfo(dir.Root.FullName); clusterSize = (diskInfo.BytesPerSector * diskInfo.SectorsPerCluster); return clusterSize; }