linq to sql query with checkboxes條件組合

Question

如果復選框chkAus已選中：

if (chkAus.Checked)
                {
                    vAdvanceSearchResults  = (from t in vAdvanceSearchResults
                                    join imp in _bDataContext.Imprints on t.ImprintID equals imp.ID
                                    join cc in _bDataContext.CountryCodes on imp.CountryID equals cc.ID
                                    where cc.Code.Contains("AU")
                                    select t).Distinct();**
                }

如果檢查了chkAus和chkNz

if (chkNz.Checked && chkAus.Checked)
            {
                vAdvanceSearchResults = (from t in vAdvanceSearchResults
                                join imp in _bDataContext.Imprints on t.ImprintID equals imp.ID
                                join cc in _bDataContext.CountryCodes on imp.CountryID equals cc.ID
                                where cc.Code.Contains("AU") || cc.Code.Contains("NZ")
                                select t).Distinct();
            }

linq查詢的條件隨着選中復選框而改變。

where cc.Code.Contains("AU") || cc.Code.Contains("NZ")

我有將近10個復選框，並且在如何編寫這么多條件上陷入困境。 請幫忙。

例如，如果存在chkUS ：則linq查詢的chkAus，chkNz，chkUS復選框的組合會更改。

where cc.Code.Contains("AU") || cc.Code.Contains("NZ") || cc.Code.Contains("US")

Answer 1

將它們全部放入列表中，然后執行if list.contains（cc.Code）

var a = new List<string>(){"AU","NZ","US"};
var linq =  (from t in vAdvanceSearchResults
                                join imp in _bDataContext.Imprints on t.ImprintID equals imp.ID
                                join cc in _bDataContext.CountryCodes on imp.CountryID equals cc.ID
                                where a.Contains(cc.Code)
                                select t).Distinct();

Answer 2

首先創建所選復選框的列表。 像這樣。

var selectedCountries = new List<string>();
if (chkAus.Checked) selectedCountries.Add("AU");
if (chkNz.Checked) selectedCountries.Add("NZ");
if (chkUs.Checked) selectedCountries.Add("US");
//... And so on

然后修改您的linq查詢，以檢查此列表是否包含代碼，我的意思是反轉比較是一個答案。 確保刪除此linq查詢的條件。

vAdvanceSearchResults = (from t in vAdvanceSearchResults 
    join imp in _bDataContext.Imprints on t.ImprintID equals imp.ID 
    join cc in _bDataContext.CountryCodes on imp.CountryID equals cc.ID
    where  selectedCountries.Contains(cc.Code)
    select t).Distinct();

這將解決您的問題。