使用IList的下拉列表需要Guid

本文关键字：Guid 下拉列表 IList 使用 | 更新日期: 2023-09-27 17:59:10

我在访问使用Guid参数生成.ToList（）的服务时遇到一些问题

 public IList<Info> GetBusinessLocations(Guid businessId)
    {
        using (var db = new DealerContext())
        {
            return GetDealerDetails(
                db.Details
                  .Join(db.BusinessLocations,
                  x => x.BusinessId,
                  y => y.BusinessId, (x, y) => x)
                  .Where(d => d.BusinessId == businessId), db)
                  .ToList();
        }
    }

我尝试过用guid作为参数编写ActionResult，但我仍然收到一个错误，即"parameters dictionary contains a null entry for parameters'businessId'"

 public ActionResult Create(Guid businessId)
    {

        ViewBag.Locations = new SelectList(ServiceBus.GetBusinessLocations(businessId), "BusinessId", "LocationName");
        return View(IdGenerator());
    }

 private static Data.Models.Business IdGenerator()
    {
        var model = new Models.Business
        {
            BusinessId = Guid.NewGuid()
        };
        return (model);
    }

在我看来，我只是打电话给的下线

@Html.DropDownListFor(m =>m.BusinessId, (IEnumerable<SelectListItem>)ViewBag.Locations,"Select your Businesses Location")

如果有人能提供一些见解，我将不胜感激。我很难在SO上找到类似的场景。

使用IList的下拉列表需要Guid

我最终更改了很多代码，所以我用我的修复程序来结束这个问题。希望这个方法能帮助其他人。

服务查询

public IList<DealerInfo> GetBusinessLocations(Guid? locationId)
         {
        using (var db = new DealerContext())
             {
            var query = db.DealerDetails
                .Join(db.DealerValidations,
                    d=>new {bizId=d.BusinessId,lId=d.LocationId},
                    dv=>new {bizId=dv.BusinessID,lId= dv.LocationID},
                    (d,dv)=>d);
            if (locationId.HasValue)
                query = query.Where(d => d.LocationId == locationId.Value);
            return GetDealerDetails(query)
                .OrderBy(d =>d.DealerName)
                .ToList();
        }
    }

控制器动作

    public ActionResult GetLocations(Guid? id)
    {
        IList<DealerInfo> locations;
        locations = Service.GetBusinessLocations(id);

        ViewData["LocationId"] = new SelectList(locations, "LocationId", "DealerName", "(Select)");
        return PartialView("_DealerDropDown");
    }

部分视图

<div class="editor-field" id="locationdropdown">
    @Html.DropDownList("LocationId", ViewData["LocationId"] as SelectList, "(Select)", new { onchange = "onLocationSelected()", id="querydrop" })
</div>

我知道这是针对我的特定问题的，但希望类似情况下的人会发现这很有用。

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