无法从Cosmos DB中删除项目

Question

我正在尝试从Cosmos DB中删除我的物品。但是我收到一个错误，即具有指定ID的实体不存在。我想念什么？

static DocumentClient docClient = null;
        string id;

        public PostService()
        {

        }
        static readonly string databaseName = "xxxx";
        static readonly string collectionName = "xxx";


public async  Task DeletePost(Post selectedPost)
        {
            if (!Initialize())
                return;

            var docUri = UriFactory.CreateDocumentUri(databaseName, collectionName, selectedPost.Id);
            await docClient.DeleteDocumentAsync(docUri, new RequestOptions() { PartitionKey = new Microsoft.Azure.Documents.PartitionKey(id)});

        }