Azure Cosmos Db 文档 - 想要对文档中已删除的属性使用 ReplaceDocumentAsync

Question

// I am using code like below
Document doc = client.CreateDocumentQuery<Document>(collectionLink)
                            .Where(r => r.Id == "doc id")    
                            .AsEnumerable()
                            .SingleOrDefault();

doc.SetPropertyValue("MyProperty1", "updated value");
Document updated = await client.ReplaceDocumentAsync(doc);

想要从文档中删除“MyProperty2”。如何做到这一点？

Answer 1

您似乎想要更新 MyProperty1 属性并从文档中删除 MyProperty2 属性，以下示例代码供您引用。

private async Task updateDoc()
{
    string EndpointUri = "xxxxx";
    string PrimaryKey = "xxxxx";
    DocumentClient client;

    client = new DocumentClient(new Uri(EndpointUri), PrimaryKey);

    Document doc = client.CreateDocumentQuery<Document>(UriFactory.CreateDocumentCollectionUri("testdb", "testcoll"))
                .Where(r => r.Id == "doc5")
                .AsEnumerable()
                .SingleOrDefault();

    //dynamically cast doc back to your MyPoco
    MyPoco poco = (dynamic)doc;

    //Update MyProperty1 of the poco object
    poco.MyProperty1 = "updated value";

    //replace document
    Document updateddoc = await client.ReplaceDocumentAsync(doc.SelfLink, poco);


    Console.WriteLine(updateddoc);
}

public class MyPoco
{
    public string id { get; set; }
    public string MyProperty1 { get; set; }
}

我的文档: 更新:

编辑:

this would remove "MyProperty3" and "MyProperty4" as well.

正如您所提到的，将属性设置为 null 也是一种方法。

Document doc = client.CreateDocumentQuery<Document>(UriFactory.CreateDocumentCollectionUri("testdb", "testcoll"))
            .Where(r => r.Id == "doc5")
            .AsEnumerable()
            .SingleOrDefault();

doc.SetPropertyValue("MyProperty2", null);

//replace document
Document updateddoc = await client.ReplaceDocumentAsync(doc.SelfLink, doc);