正如您在下面的屏幕快照中看到的那样，当尝试使用Kentico API 11.0.26 覆盖现有媒体文件时，Kentico CMS正在创建一个附加文件。我的目标是只有一个文件。

这是我的API代码

// Gets the media library
MedialibraryInfo library = MedialibraryInfoProvider.GetMedialibraryInfo(libraryName,siteName);

if (library != null)
{
    // Gets all .png files from the "NewFolder" folder of the specified media library
    var mediaFiles = MediaFileInfoProvider.GetMediaFiles()
                                                .WhereEquals("FilelibraryID",library.libraryID)
                                                .WhereEquals("FileName",fileName)
                                                .WhereStartsWith("FilePath",folderName);

    if (mediaFiles.Count == 0)//no existing file by that name,create new one
    {
        // Creates a new media library file object
        MediaFileInfo mediaFile = new MediaFileInfo();

        // Sets the media library file properties
        mediaFile.FileSiteID = siteId;
        mediaFile.FilelibraryID = library.libraryID;
        mediaFile.FileName = fileName;
        mediaFile.FileTitle = headerSubtitle;
        mediaFile.FileDescription = "some report";
        mediaFile.FilePath = string.Format("{0}/",folderName); // Sets the path within the media library's folder structure
        mediaFile.FileExtension = ".pdf";
        mediaFile.FileMimeType = MimeTypeHelper.GetMimetype(".pdf");
        using (StreamReader streamReader = new StreamReader(outputFilename))
        {
            mediaFile.FileBinaryStream = streamReader.BaseStream;
            mediaFile.FileSize = streamReader.BaseStream.Length;

            // Saves the media library file
            MediaFileInfoProvider.SetMediaFileInfo(mediaFile);
        }
    }
    else//file already existing by that name,update it's contents
    {
        // Gets the media file
        MediaFileInfo updateFile = mediaFiles.FirstObject;
        using (StreamReader streamReader = new StreamReader(outputFilename))
        {
            updateFile.FileBinaryStream = streamReader.BaseStream;
            updateFile.FileSize = streamReader.BaseStream.Length;


            // Saves the media library file
            MediaFileInfoProvider.SetMediaFileInfo(updateFile);
        }
    }
}