文本文件从磁盘读取、写入

usingSystem;
usingSystem.Text;
usingSystem.IO;

namespaceXXXX.Common
{
///<summary>
///文本文件从磁盘读取、写入
///</summary>
publicclassFileHelper
{

///<summary>
///从文件中读取文本内容
///</summary>
///<paramname="filePath">文本路径</param>
///<returns>返回文件中的内容</returns>
publicstaticstringRead(stringfilePath)
{
stringresult=string.Empty;
if(File.Exists(filePath))
{
using(StreamReadersr=newStreamReader(filePath,Encoding.Default))
{
result=sr.ReadToEnd();
sr.Close();
returnresult;
}
}
returnresult;
}

///<summary>
///写入文本文件，按默认编码
///</summary>
///<paramname="filePath">文本文件路径包括文件名</param>
///<paramname="content">写入内容</param>
publicstaticvoidWrite(stringfilePath,stringcontent)
{
using(StreamWritersw=newStreamWriter(filePath,false,Encoding.Default))
{
sw.Write(content);
sw.Close();
}
}
///<summary>
///写入文本文件，以UFT8格式编码
///</summary>
///<paramname="filePath">文本文件路径包括文件名</param>
///<paramname="content">写入内容</param>
///<paramname="UTF8"></param>
publicstaticvoidWrite(stringfilePath,stringcontent,boolUTF8)
{
using(StreamWritersw=newStreamWriter(filePath,false,Encoding.UTF8))
{
sw.Write(content);
sw.Close();
}
}

///<summary>
///备份文件
///</summary>
///<paramname="sourceFileName">源文件路径</param>
///<paramname="destFileName">目标文件路径</param>
///<paramname="overwrite">是否覆盖已存在文件</param>
///<returns></returns>
publicstaticboolBackupFile(stringsourceFileName,stringdestFileName,booloverwrite)
{
boolflag;
if(!File.Exists(sourceFileName))
{
thrownewFileNotFoundException(sourceFileName+"文件不存在！");
}
if(!overwrite&&File.Exists(destFileName))
{
returnfalse;
}
try
{
File.Copy(sourceFileName,destFileName,true);
flag=true;
}
catch(Exceptionexception)
{
throwexception;
}
returnflag;
}

///<summary>
///拷贝文件夹文件
///</summary>
///<paramname="srcDir"></param>
///<paramname="dstDir"></param>
publicstaticvoidCopyDirFiles(stringsrcDir,stringdstDir)
{
if(Directory.Exists(srcDir))
{
foreach(stringstrinDirectory.GetFiles(srcDir))
{
stringdestFileName=Path.Combine(dstDir,Path.GetFileName(str));
File.Copy(str,destFileName,true);
}

foreach(stringstr3inDirectory.GetDirectories(srcDir))
{
stringstr4=str3.Substring(str3.LastIndexOf(@"\")+1);
CopyDirFiles(Path.Combine(srcDir,str4),Path.Combine(dstDir,str4));
}
}
}

///<summary>
///删除文件夹文件
///</summary>
///<paramname="dir"></param>
publicstaticvoidDeleteDirFiles(stringdir)
{
if(Directory.Exists(dir))
{
foreach(stringstrinDirectory.GetFiles(dir))
{
File.Delete(str);
}
foreach(stringstr2inDirectory.GetDirectories(dir))
{
Directory.Delete(str2,true);
}
}
}

///<summary>
///获得文件最后修改时间
///</summary>
///<paramname="file"></param>
///<returns></returns>
publicstaticDateTimeGetFileLastWriteTime(stringfile)
{
if(File.Exists(file))
{
returnFile.GetLastWriteTime(file);
}
returnDateTime.MaxValue;
}

///<summary>
///取消文件的只读属性
///</summary>
///<paramname="file"></param>
publicstaticvoidRemoveFileReadOnlyAttribute(stringfile)
{
File.SetAttributes(file,File.GetAttributes(file)&~FileAttributes.ReadOnly);
}
}
}