Ajas Aju

我得到了答案,我写了下面的方法

 public async Task<bool> UpdateCommentAsync(Threads thread)
    {
        var builder = Builders<Comments>.Filter;
        var filter = builder.Empty;
        var update = Builders<Comments>.Update.Set("Threads.$[i].Content", thread.Content);
        var arrayFilters = new List<ArrayFilterDefinition> { new JsonArrayFilterDefinition<Threads>("{'i._id': '" + thread.Id + "'}") };
        var updateOptions = new UpdateOptions { ArrayFilters = arrayFilters };
        var result = await _context.Comments.UpdateManyAsync(filter, update, updateOptions);
        return result.ModifiedCount > 0;
    }