数据存储查询数组

Question

我正在尝试运行数据存储区查询以获取名称和价格列表.但是,我不断收到此错误消息:

无法隐式将类型' Google.Cloud.Datastore.V1.DatastoreQueryResults' 转换为' System.Collections.Generic.List<TestApp.Models.AllSportsStore>'

这是我正在使用的代码:

AllSportsStore.cs

public DatastoreDb _db;

[BindProperty]
public List<AllSportsStore> SportsStoreList { get; set; }


public void OnGet()
{
    Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS", Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "xxxxx.json"));
    _db = DatastoreDb.Create("projectid");
    Query query = new Query("Sports_db");
    IEnumerable<Entity> stores = _db.RunQuery(query).Entities;
    SportsStoreList = stores.Select(_ => new AllSportsStore
    {
        Name = _["Name"].ToString(),
        Price = _["Price"].ToString(),
    }).ToList();
}

AllSportsStore.cshtml页面

@for (var i = 0; i < Model.SportsStoreList.Count; i++)
{
    <tr>
        <td>
            @Html.DisplayFor(model => model.SportsStoreList[i].Name)
        </td>
        <td>
            @Html.DisplayFor(model => model.SportsStoreList[i].Price)
        </td>
    </tr>
}

这是数据存储区的映像

根据评论更新了代码结果

Answer 1

正如评论中已经说明的那样,您正在尝试为SportsStoreList属性分配错误的类型.

有一个模型来存储实体细节

public class SportsStoreItem {
    public string Name { get; set; }
    public decimal Price { get; set; }
}

在AllSportsStore.cs页面中使用该模型

public class AllSportsStore : PageModel {

    private readonly DatastoreDb _db;

    public AllSportsStore() {
        _db = DatastoreDb.Create("projectid");
    }

    [BindProperty]
    public List<SportsStoreItem> SportsStoreList { get; set; }

    public IActionResult OnGet() {
        Query query = new Query("Sports_db");
        IEnumerable<Entity> stores = _db.RunQuery(query).Entities;
        SportsStoreList = stores.Select(_ => new SportsStoreItem {
            Name = (string)_["Name"],
            Price = (decimal)_["Price"]
        }).ToList();

        return Page();
    }
}

请注意从数据存储db中检索的实体如何转换为强类型对象.

然后,您应该能够访问视图/页面中列表中的项目.

@for (var i = 0; i < Model.SportsStoreList.Count; i++) {
    <tr>
        <td>
            @Html.DisplayFor(model => model.SportsStoreList[i].Name)
        </td>
        <td>
            @Html.DisplayFor(model => model.SportsStoreList[i].Price)
        </td>
    </tr>
}