问如何通过文件扩展名获取多媒体类型的中医URI

EN

private static string GetMultimediaTypeTCMURI(FileExtensionsList lFileExtensions)
{
    string lTCMURI = "";
    try
    {
        SessionAwareCoreService2010Client client 
                                          = new SessionAwareCoreService2010Client();
        client.ClientCredentials.Windows.ClientCredential.UserName = "myUserName";
        client.ClientCredentials.Windows.ClientCredential.Password = "myPassword";
        client.Open();
        FileExtensionsList list = new FileExtensionsList();
        var mmType = client.GetSystemWideList(new MultimediaTypesFilterData())
              .Single(mt => ((MultimediaTypeData)mt).FileExtensions == lFileExtensions);
        lTCMURI = mmType.Id;
    }
    catch (Exception e)
    {
        throw new Exception("Please check either Mimetype" 
              + lFileExtensions + "is wrong or Mimetype does not exist in SDL Tridion.");
    }
    return lTCMURI;

}

FileExtensionsList list = new FileExtensionsList();
list.Add("js");

GetMultimediaTypeTCMURI(list);