MongoDB GridFs用C#，如何存储图像等文件

MongoDB GridFS用C#存储图像等文件

csharp
using MongoDB.Bson;
using MongoDB.Driver;
using MongoDB.Driver.GridFS;
using System.IO;
public class GridFSExample
{
    private const string ConnectionString = "mongodb://localhost:27017";
    private const string DatabaseName = "mydatabase";
    public void SaveImage(string filePath, string fileName)
    {
        var client = new MongoClient(ConnectionString);
        var database = client.GetDatabase(DatabaseName);
        var gridFSBucket = new GridFSBucket(database);
        
        using (var stream = new FileStream(filePath, FileMode.Open))
        {
            var options = new GridFSUploadOptions
            {
                Metadata = new BsonDocument
                {
                    { "filename", fileName },
                    { "type", "image" }
                }
            };
            
            gridFSBucket.UploadFromStream(fileName, stream, options);
        }
    }
    public Stream GetImage(string fileName)
    {
        var client = new MongoClient(ConnectionString);
        var database = client.GetDatabase(DatabaseName);
        var gridFSBucket = new GridFSBucket(database);
        var filter = Builders.Filter.Eq("filename", fileName);
        var fileInfo = gridFSBucket.Find(filter).FirstOrDefault();
        if (fileInfo != null)
        {
            var stream = new MemoryStream();
            gridFSBucket.DownloadToStream(fileInfo.Id, stream);
            stream.Position = 0;
            return stream;
        }
        return null;
    }
}