1.第一种方法：
调用：shell32.dll ，win7下能够，window2008 r2 服务器上 不行。（缘由不知道，有多是声卡驱动没有安装？）
//添加引用：COM组件的Microsoft Shell Controls And Automation
引用shell32底层接口c:windows\system32\shell32.dll，vs自动转换成interop.shell32.dll（注：64位系统和32位系统生成的interop.shell32.dll不同）
string file = Request.Form[ "mp3path" ];
Shell32. ShellClass sh = new Shell32. ShellClass ();
Folder dir = sh.NameSpace( Path .GetDirectoryName(file));
FolderItem item = dir.ParseName( Path .GetFileName(file));
log.Info( "file:" + file);
string mp3Time = "" ;
if ( Environment .OSVersion.Version.Major >= 6)
{
mp3Time = dir.GetDetailsOf(item, 27);
}
else
{
mp3Time = dir.GetDetailsOf(item, 21);
}
sb.Append( "文件路径：" + file + "\r\n" );
sb.Append( "<br />" );
sb.Append( "服务器的OSVersion.Version.Major：" + Environment .OSVersion.Version.Major);
sb.Append( "用Shell32.dll方式测试文件的时长：" + mp3Time);
sb.Append( "<br />" );
2.第二种方法：利用： mediainfo .dll：
MediaInfo.dll
846.3 KB](https://www.evernote.com/shard/s115/sh/cc1039c4-77ae-40ee-8b7f-0db10fe02e3b/42c3c360b8587588/res/e2e7830b-a8eb-4c00-b95a-6c232521fbb4/MediaInfo.dll)
MediaInfo MI = new MediaInfo ();
MI.Open(file);
string s = MI.Get( StreamKind .Audio, 0, "Duration" );
string dateTimeStr = Common. TimeHelper .GetDateTimeStr( Convert .ToInt32(s));
sb.Append( "用mediainfo.dll计算时长：" + dateTimeStr);
同样，也是win7下没有问题，服务器上有问题。
3, 第三种方法：利用：
ffmpeg.zip
5.7 MB](https://www.evernote.com/shard/s115/sh/cc1039c4-77ae-40ee-8b7f-0db10fe02e3b/42c3c360b8587588/res/ec77eba4-fcdc-4840-b3e4-101f7df507c8/ffmpeg.zip)
//用ffmpeg.exe 获取：
sb.Append( "<br />" );
string fromffmpeg = Fromffmpeg(file);
sb.Append( "fromffmpeg:" + fromffmpeg);
子方法：
private string Fromffmpeg( string fileName)
{
string duration = "" ;
using (System.Diagnostics. Process pro = new System.Diagnostics. Process ())
{
pro.StartInfo.UseShellExecute = false ;
pro.StartInfo.ErrorDialog = false ;
pro.StartInfo.RedirectStandardError = true ;
pro.StartInfo.FileName = AppDomain .CurrentDomain.BaseDirectory +
"ffmpeg.exe" ;
pro.StartInfo.Arguments = " -i " + fileName;
pro.Start();
System.IO. StreamReader errorreader = pro.StandardError;
pro.WaitForExit(1000);
string result = errorreader.ReadToEnd();
if (! string .IsNullOrEmpty(result))
{
result = result.Substring(result.IndexOf( "Duration: " ) +
( "Duration: " ).Length, ( "00:00:00" ).Length);
duration = result;
}
return duration;
}
}
到此：成功！服务器ok~
