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我的数据库中有 4 个表,即餐厅、美食、设施、菜肴。我创建了一个从这些表返回数据的表适配器。现在我必须根据用户选择的菜肴、设施或菜肴来过滤数据,并返回结果餐厅。这是我的查询:

    public string alldata(string location, string cuisines, string facility)
    {
        location = location.Replace('|', ',');
        facility = facility.Replace('|', ',');
        cuisines = cuisines.Replace('|', ',');
        string loc; string data = null; int id;
        DataSet3.DataTable1DataTable all = getall.GetAllData();

        IEnumerable<DataRow> query = from resturants in all.AsEnumerable()

                                     where ((location.Contains(resturants.City)) && (facility.Contains(resturants.FacilityName) && (cuisines.Contains(resturants.Type))))
                                     select resturants;
        foreach (DataSet3.DataTable1Row item in query)
        {
            name = item.Name;
            loc = item.Location;

            id = item.RestaurantID;
            data += name + "%" + loc +"%"+id+ "?";
        }
        return data; 


    }

此查询返回重复的条目,并且在选择中不应用 AND。我被困住了。请帮我。

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1 回答 1

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IEnumerable<DataRow> query =    (from resturants in all.AsEnumerable()

                                         where ((location.Contains(resturants.City)) && (facility.Contains(resturants.FacilityName) && (cuisines.Contains(resturants.Type))))
                                         select resturants).Distinct()

您可以使用 Distinct() 运算符在 Linq 中获取不同的记录

于 2013-01-23T06:57:46.657 回答