小编Ale*_*kiy的帖子

这是我的代码:

public class RouteSingleton
{
    private IDictionary<string, string> _dealCatLinks;
    private IDictionary<string, string> _sectionLinks;
    private IDictionary<string, string> _categoryLinks;
    private IDictionary<string, string> _materials;
    private IDictionary<string, string> _vendors;
    public RouteSingleton(IDealService dealService
        , ICategoryService categoryService
        , IVendorService vendorService)
    {


        this._dealCatLinks = dealService.GetDealCatLinks("PLV").Distinct().ToDictionary(x => x, x => x);
        this._sectionLinks = categoryService.GetSectionLinks("PLV").Distinct().ToDictionary(x => x, x => x);
        this._categoryLinks = categoryService.GetMainCategoryLinks("PLV")
            .Where(x => !_sectionLinks.ContainsKey(x)).Distinct().ToDictionary(x => x, x => x);
        this._vendors = _vendorService.GetVendorLinks("PFB").Distinct().ToDictionary(x => x, x => x);

    }

    public bool IsDealCategory(string slug)
    {
        return _dealCatLinks.ContainsKey(slug);
    }

    public …

我想知道如何使用 mongo 驱动程序构建复杂的查询。这是我的查询：

var builder = Builders<MongoNavFilter>.Filter;
var query = builder.Where(x => x.Link == link && x.SubLink == subLink);
if (some statement)
{
    var finalExpression = ...
    query = query & Builders<MongoNavFilter>.Filter.Where(finalExpression); 
}
if (onsale)
    query = query & Builders<MongoNavFilter>.Filter.Where(x => !(x.Promo == null && x.Promo == string.Empty));

var filters = _db.GetCollection<MongoNavFilter>("NavFilters").
                    Find(query).ToList();

这段EF IQueryable代码工作正常，但我无法使用mongo driver. 谁能告诉我我做错了什么？