问如何在Web应用程序中存储PDF文件

EN

private async Task<Guid> UploadDocument(Uri uri, string imageName)
    {

        var endpoint = new Uri(_settings.ImageConfig.CosmosUri);
        var auth = _settings.ImageConfig.CosmosKey;
        var client = new DocumentClient(endpoint, auth);
        var identifier = Guid.NewGuid();

        await client.CreateDatabaseIfNotExistsAsync(new Database() { Id = dbName });
        await client.CreateDocumentCollectionIfNotExistsAsync(UriFactory.CreateDatabaseUri(dbName),
            new DocumentCollection { Id = colName });

        await client.CreateDocumentAsync(
            UriFactory.CreateDocumentCollectionUri(dbName, colName),
            new ImageDocument
            {
                Id = identifier,
                IsApproved = null,
                PetName = petName,
                MediaUrl = uri.ToString(),
                Created = DateTime.UtcNow
            });

        return identifier;
    }