將範圍索引添加到Azure DocumentDB集合時出現異常

Question

我試圖將範圍索引添加到Azure DocumentDB集合中的特定屬性，如this文章中所述。當執行我的代碼來創建集合我得到以下錯誤：

The special mandatory indexing path \\"\/\\" is not provided in any of the path type sets. Please provide this path in one of the sets.

我使用創建集合的代碼是：

var collection = new DocumentCollection { id = "myCollectionID" }; 

collection.IndexingPolicy.IncludedPaths.Add(new IndexingPath 
{ 
    IndexType = IndexType.Range, 
    Path = "/\"TimeStamp\"/\"Epoch\"/?", 
    NumericPrecision = 7 
}); 

this._client.CreateDocumentCollectionAsync(database.SelfLink, collection); 

代碼工作，如果我設置的路徑該索引簡單地爲「/」，但我更願意能夠在特定屬性上創建索引。我究竟做錯了什麼？

Answer 1

你必須包括「/」像一個額外的IncludedPath：

var collection = new DocumentCollection { id = "myCollectionID" }; 

collection.IndexingPolicy.IncludedPaths.Add(new IndexingPath 
{ 
    IndexType = IndexType.Range, 
    Path = "/\"TimeStamp\"/\"Epoch\"/?", 
    NumericPrecision = 7 
}); 

collection.IndexingPolicy.IncludedPaths.Add(new IndexingPath 
{ 
    IndexType = IndexType.Hash, 
    Path = "/" 
}); 

this._client.CreateDocumentCollectionAsync(database.SelfLink, collection); 

另外，如果你想從索引中完全排除所有其他路徑，你可以做到以下幾點：

var collection = new DocumentCollection { id = "myCollectionID" }; 

collection.IndexingPolicy.IncludedPaths.Add(new IndexingPath 
{ 
    IndexType = IndexType.Range, 
    Path = "/\"TimeStamp\"/\"Epoch\"/?", 
    NumericPrecision = 7 
}); 

collection.IndexingPolicy.ExcludedPaths.Add("/"); 

this._client.CreateDocumentCollectionAsync(database.SelfLink, collection); 

DocumentDB始終要求您包含或排除「/」，以便索引方案明確無誤。希望這可以幫助。