Question

我试图从documentDB查询我的一个文档，但它似乎没有工作，这就是我设置它的方式：

NoSQLService：

private INoSQLProvider client;
private static IContainer container;

public NoSQLService(INoSQLProvider provider)
{
    client = provider;
}

public static dynamic QueryDocument<T>(Uri reference, FeedOptions queryOptions)
{
    var documentDB = container.Resolve<INoSQLProvider>();
    return documentDB.QueryDocumentAsync(reference, queryOptions);
}

INoSQLProvider：

IOrderedQueryable<Document> QueryDocumentAsync(Uri reference, FeedOptions queryOptions);

AzureDocumentDBService

AzureDocumentDBService继承自INoSQLProvider

private readonly IDocumentClient client;

public IOrderedQueryable<Document> QueryDocumentAsync (Uri reference, FeedOptions queryOptions)
{
    return client.CreateDocumentQuery(reference, queryOptions);
}

AzureDocumentDBTest

FeedOptions queryOptions = new FeedOptions();

Documents document = new Documents();

document.id = "112";

queryOptions.MaxItemCount = -1;

var reference = NoSQLService.CreateDocumentUri("ppsession1", "callumtest");
IQueryable<Documents> documentQuery = NoSQLService.QueryDocument<Documents>(reference, queryOptions).Where(document.id = "112");

foreach (Documents documents in documentQuery)
{
    Console.WriteLine("\tRead {0}", documents);

}

当我运行测试时，我得到一个例外：

Microsoft，CSparp.RuntimeBuilder.RuntimeBinderException：＆＃39; object＆＃39;不不包含＆＃39; Where＆＃39;。
的定义

Answer 1

您将从dynamic返回NoSQLService.QueryDocument，然后尝试在其上应用Linq扩展方法Where。哪个你不能做。您必须将其转换为可以使用该扩展名的内容。

因此，要么使用动态

更改NoSQLService

public static IQueryable<Document> QueryDocument<T>(Uri reference, FeedOptions queryOptions)
{
    var documentDB = container.Resolve<INoSQLProvider>();
    return documentDB.QueryDocumentAsync(reference, queryOptions);
}

或将结果投射到您的测试中

var reference = NoSQLService.CreateDocumentUri("ppsession1", "callumtest");
IQueryable<Document> documentQuery = ((IQueryable<Document>)NoSQLService.QueryDocument<Document>(reference, queryOptions)).Where(document => document.id == "112");

文档数据库查询

1 个答案: