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[英]The Result of a Query Cannot be Enumerated More than Once (C#) (Entity Framework) (Stored Procedure)
[英]The result of a query cannot be enumerated more than once when using stored procedure
我試圖用存儲過程替換視圖以基於關鍵字搜索結果。 但是當我傳遞關鍵字時會引發錯誤
查詢結果不能被多次枚舉
但如果將關鍵字保留為空,則效果很好。 以下是我獲取搜索結果的方法。 在這種情況下,誰能提供有關如何枚舉結果的建議?
public IEnumerable <BrandNameToIngredient> GetBrandNameToIngMapResults(string Keyword)
{
IEnumerable<BrandNameToIngredient> lstBrandNametoIng = from map in DB.USP_BRANDNAME_INGREDIENT_MAP()
select new BrandNameToIngredient
{
IngredientBrandNameMapID=map.INGREDIENT_PRODUCT_MAP_ID,
BrandName = map.FDA_BRAND_NAME, //From Table 1
PFCName = map.PFC_DESC==null?"":map.PFC_DESC, //From Table 1
IngredientName = map.INGREDIENT_NAME, //From Table 2
HCIngredientName = map.HC_INGREDIENT_NAME, //From Table 2
KeywordfromPage = Keyword
};
if (!string.IsNullOrEmpty(Keyword))
{
lstBrandNametoIng = lstBrandNametoIng.Where(x => x.BrandName.ToLower().Contains(x.KeywordfromPage.ToLower()) //Able to get result
|| x.PFCName.ToLower().Contains(x.KeywordfromPage.ToLower()) //Able to get result
|| x.IngredientName.ToLower().Contains(x.KeywordfromPage.ToLower()) //Error Here
|| x.HCIngredientName.ToLower().Contains(x.KeywordfromPage.ToLower())); //Error Here
}
return lstBrandNametoIng;
}
最好先對查詢進行操作,然后最后返回可枚舉。
public IEnumerable<BrandNameToIngredient> GetBrandNameToIngMapResults(string Keyword)
{
var brandNametoIngQuery = DB.USP_BRANDNAME_INGREDIENT_MAP()
.Where(x => string.IsNullOrEmpty(Keyword)
|| x.BrandName.Contains(Keyword, StringComparison.OrdinalIgnoreCase)
|| x.PFCName.Contains(Keyword, StringComparison.OrdinalIgnoreCase)
|| x.IngredientName.Contains(Keyword, StringComparison.OrdinalIgnoreCase)
|| x.HCIngredientName.Contains(Keyword, StringComparison.OrdinalIgnoreCase))
.Select(map=> new BrandNameToIngredient
{
IngredientBrandNameMapID = map.INGREDIENT_PRODUCT_MAP_ID,
BrandName = map.FDA_BRAND_NAME, //From Table 1
PFCName = map.PFC_DESC == null ? "" : map.PFC_DESC, //From Table 1
IngredientName = map.INGREDIENT_NAME, //From Table 2
HCIngredientName = map.HC_INGREDIENT_NAME, //From Table 2
KeywordfromPage = Keyword
}).AsEnumerable();
}
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