/// <summary>
/// 构造函数。
/// </summary>
/// <param name="filePath">文件路径。</param>
/// <param name="loadType">加载方式。</param>
/// <param name="fileKeyType">缓存键类型。</param>
public FileCacheItem(string filePath, DataLoadType loadType, CacheKeyType fileKeyType)
{
this.FilePath = filePath;
if (!File.Exists(this.FilePath))
{
throw new ArgumentException(filePath + " 文件不存在！");
}
this.FileLoadType = loadType;
this.FileKeyType = fileKeyType;
this.FileName = Path.GetFileNameWithoutExtension(this.FilePath);
this.FileExtension = Path.GetExtension(this.FilePath);
this.LastAccessDate = DateTime.Now;
this.ItemSize = new FileInfo(this.FilePath).Length;
this.ItemKey = this.FilePath;
if (this.FileKeyType == CacheKeyType.MD5 || this.FileLoadType == DataLoadType.Load)
{
using (FileStream fstream = new FileStream(this.FilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
if (this.FileKeyType == CacheKeyType.MD5)
{
this.ItemKey = iPower.Cryptography.HashCrypto.HashFile(fstream, "md5");
fstream.Seek(0, SeekOrigin.Begin);
}
if (this.FileLoadType == DataLoadType.Load)
{
using (BufferBlockUtil block = new BufferBlockUtil())
{
byte[] buf = new byte[1024];
int len = 0;
while ((len = fstream.Read(buf, 0, buf.Length)) > 0)
{
block.Write(buf, 0, len);
}
this.FileBytes = block.ToArray();
}
}
fstream.Close();
}
}
}
/// <summary>
/// 下载文件。
/// </summary>
/// <param name="fileName">文件名称。</param>
/// <returns>文件数据。</returns>
public byte[] Download(string fileName)
{
if (string.IsNullOrEmpty(fileName)) throw new ArgumentNullException("fileName", "文件名不能为空！");
byte[] data = null;
string path = Path.GetFullPath(this.root + "\\" + fileName);
if (File.Exists(path))
{
using (BufferBlockUtil block = new BufferBlockUtil())
{
using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
{
int count = 0;
byte[] buffer = new byte[1024];
while ((count = fs.Read(buffer, 0, buffer.Length)) > 0)
{
block.Write(buffer, 0, count);
}
fs.Close();
}
data = block.ToArray();
}
}
return data;
}
/// <summary>
/// 延时加载数据。
/// </summary>
internal void DelayLoad()
{
if ((this.FileBytes == null || this.FileBytes.Length == 0) && (this.FileLoadType == DataLoadType.DelayLoad) && File.Exists(this.FilePath))
{
using (FileStream fstream = new FileStream(this.FilePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (BufferBlockUtil block = new BufferBlockUtil())
{
byte[] buf = new byte[1024];
int len = 0;
while ((len = fstream.Read(buf, 0, buf.Length)) > 0)
{
block.Write(buf, 0, len);
}
this.FileBytes = block.ToArray();
}
}
}
}