此代碼用于傳遞List<String>withRedirectToAction方法：public List<String> ListOfBrandNames(string id) { var result = db.Items.Where(x => x.Category.Name.Equals(id)).Select(x => x.BrandID).ToList(); var ListOfBrands = db.Brands.Where(t => result.Contains(t.BrandID)).ToList(); List<String> BrandNames = ListOfBrands.Select(f => f.Name.ToString()).ToList(); return RedirectToAction("BrandsOfACategory", new { brands = BrandNames }); }RedirectToAction方法拋出此錯(cuò)誤：無(wú)法將類型“System.Web.Mvc.RedirectToRootResult”隱式轉(zhuǎn)換為“System.Collection.Generic.List”
2 回答
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TA貢獻(xiàn)1871條經(jīng)驗(yàn) 獲得超8個(gè)贊
您在操作方法上使用了錯(cuò)誤的返回類型，因?yàn)镽edirectToAction需要返回類型ActionResult而不是List<string>因?yàn)镽edirectToRouteResult繼承自ActionResult.
更新：
您需要將列表序列化為 JSON 字符串才能順利傳遞（帶Newtonsoft.Json庫(kù)），因此目標(biāo)操作方法必須使用string參數(shù)。這是將品牌列表發(fā)送到另一個(gè)操作方法的正確設(shè)置：
public ActionResult ListOfBrandNames(string id)
{
var result = db.Items.Where(x => x.Category.Name.Equals(id)).Select(x => x.BrandID).ToList();
var ListOfBrands = db.Brands.Where(t => result.Contains(t.BrandID)).ToList();
return RedirectToAction("BrandsOfACategory", new { brands = JsonConvert.SerializeObject(ListOfBrands) });
}
目標(biāo)控制器動(dòng)作應(yīng)該是這樣的：
[HttpGet]
public ActionResult BrandsOfACategory(string brands)
{
var listOfBrands = JsonConvert.DeserializeObject<List<Brand>>(brands);
List<string> BrandNames = listOfBrands.Select(f => f.Name.ToString()).ToList();
// do something and return view
}
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TA貢獻(xiàn)1831條經(jīng)驗(yàn) 獲得超9個(gè)贊
試試下面的代碼，
public List<String> ListOfBrandNames(string id)
{
var result = db.Items.Where(x => x.Category.Name.Equals(id)).Select(x => x.BrandID).ToList();
var ListOfBrands = db.Brands.Where(t => result.Contains(t.BrandID)).ToList();
List<String> BrandNames = ListOfBrands.Select(f => f.Name.ToString()).ToList();
TempData["Brands"]=BrandNames;
return RedirectToAction("BrandsOfACategory");
}
之后，您可以從 TempData 獲取數(shù)據(jù)到“BrandsOfACategory”方法中的字符串列表。
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