using system;
using system.io;
using system.web;
using system.web.ui.webcontrols;
namespace dotnet.utilities
{
/// <summary>
/// 文件上传类
/// </summary>
public class fileup
{
public fileup()
{ }
/// <summary>
/// 转换为字节数组
/// </summary>
/// <param name="filename">文件名</param>
/// <returns>字节数组</returns>
public byte[] getbinaryfile(string filename)
{
if (file.exists(filename))
{
filestream fsm = null;
try
{
fsm = file.openread(filename);
return this.convertstreamtobytebuffer(fsm);
}
catch
{
return new byte[0];
}
finally
{
fsm.close();
}
}
else
{
return new byte[0];
}
}
/// <summary>
/// 流转化为字节数组
/// </summary>
/// <param name="thestream">流</param>
/// <returns>字节数组</returns>
public byte[] convertstreamtobytebuffer(system.io.stream thestream)
{
int bi;
memorystream tempstream = new system.io.memorystream();
try
{
while ((bi = thestream.readbyte()) != -1)
{
tempstream.writebyte(((byte)bi));
}
return tempstream.toarray();
}
catch
{
return new byte[0];
}
finally
{
tempstream.close();
}
}
/// <summary>
/// 上传文件
/// </summary>
/// <param name="posphotoupload">控件</param>
/// <param name="savefilename">保存的文件名</param>
/// <param name="imagepath">保存的文件路径</param>
public string filesc(fileupload posphotoupload, string savefilename, string imagepath)
{
string state = "";
if (posphotoupload.hasfile)
{
if (posphotoupload.postedfile.contentlength / 1024 < 10240)
{
string mimetype = posphotoupload.postedfile.contenttype;
if (string.equals(mimetype, "image/gif") || string.equals(mimetype, "image/pjpeg"))
{
string extfilestring = system.io.path.getextension(posphotoupload.postedfile.filename);
posphotoupload.postedfile.saveas(httpcontext.current.server.mappath(imagepath));
}
else
{
state = "上传文件类型不正确";
}
}
else
{
state = "上传文件不能大于10m";
}
}
else
{
state = "没有上传文件";
}
return state;
}
/// <summary>
/// 上传文件
/// </summary>
/// <param name="bindata">字节数组</param>
/// <param name="filename">文件名</param>
/// <param name="filetype">文件类型</param>
//-------------------调用----------------------
//byte[] by = getbinaryfile("e:\\hello.txt");
//this.savefile(by,"hello",".txt");
//---------------------------------------------
public void savefile(byte[] bindata, string filename, string filetype)
{
filestream filestream = null;
memorystream m = new memorystream(bindata);
try
{
string savepath = httpcontext.current.server.mappath("~/file/");
if (!directory.exists(savepath))
{
directory.createdirectory(savepath);
}
string file = savepath + filename + filetype;
filestream = new filestream(file, filemode.create);
m.writeto(filestream);
}
finally
{
m.close();
filestream.close();
}
}
}
}
以上就是了解c#文件上传类，文件流，字节数组等知识的详细内容。
