关键代码：
/// <summary>/// 获取文件大小—字节/// </summary>/// <param name="filePath">文件路径</param>/// <returns>文件大小</returns>publicstaticlongGetSize(stringfilePath)
{long_size = 0;try{if(File.Exists(filePath))
{
FileStream _stream =newFileStream(filePath, FileMode.Open);
_size = _stream.Length;
_stream.Close();
_stream.Dispose();
}
}catch(Exception ex)
{
_size = 0;
Debug.WriteLine(string.Format("获取文件大小异常，原因：{0}", ex.Message));
}return_size;
}/// <summary>/// 获取文件大小—kb/// </summary>/// <param name="filePath">文件路径</param>/// <returns>文件大小_kb</returns>publicstaticdoubleGetKBSize(stringfilePath)
{double_kb = 0;long_size = GetSize(filePath);if(_size != 0)
{
_kb = _size / 1024d;
}return_kb;
}/// <summary>/// 获取文件大小—mb/// </summary>/// <param name="filePath">文件路径</param>/// <returns>文件大小_mb</returns>publicstaticdoubleGetMBSize(stringfilePath)
{double_mb = 0;long_size = GetSize(filePath);if(_size != 0)
{
_mb = _size / 1048576d;//1024*1024==1048576;}return_mb;
}
代码比较简单，那么我们来测试一下，有一个一兆多日志文件，来读取下，如图：
测试代码：
string_path =@"C:\CodePlex\CSharpUtilHelp\UtilHelp\LogUtilHelpV2Test\bin\Release\Log\20140731.log";
Console.WriteLine("File Size:"+ FileToolV2.GetSize(_path));
Console.WriteLine("File Size_kb:"+ FileToolV2.GetKBSize(_path) +" kb");
Console.WriteLine("File Size_mb:"+ FileToolV2.GetMBSize(_path) +" mb");
测试效果：
希望有所帮助！
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