c# - 数据类型货币 C#

Question

有人请帮助我，我不知道为什么!

当我将一个值(例如 3469,2)插入到我的 SQL Server 数据库中时，我得到 34692,0000

列的类型是Money，值是double类型

// code
public void updateligne_facture(String Ref, int Qte,String Reffacture,float prixvente,int tva)
{
        SqlConnection con = new SqlConnection();
        con.ConnectionString = @"Data Source=AKRAM-PC\SQLEXPRESS;Initial Catalog=MM_DataBase;Integrated Security=True";

        con.Open();

        double prix = Qte * prixvente;

        double prix_ttc = prix * (1 + (tva/ 100D));

        String requete = "update lc SET lc.Quantite='" + Qte + "',lc.Prix_HT='"+prix+"',lc.Prix_TTC='"+prix_ttc+"' FROM LIGNES_FACTURE as lc  JOIN  MM_ARTICLE as art ON lc.ID_Article=art.ID  JOIN MM_Facture as f ON lc.ID_Facture=f.ID   WHERE art.AR_Ref='" + Ref + "' AND f.Ref='" + Reffacture + "'";
        SqlCommand command = new SqlCommand(requete, con);
        command.ExecuteNonQuery();
        con.Close();
    }

Answer 1

根据微软type mapping guide , SQL Server 的 Money 类型映射到 C# 中的 decimal。

注意:进行查询的正确方法是使用参数，如下所示:

decimal prix = (decimal)(Qte * prixvente);
decimal prix_ttc = prix * (1 + (tva/ 100M));

String requete = @"UPDATE lc 
                   SET lc.Quantite = @qte, 
                       lc.Prix_HT = @prix,
                       lc.Prix_TTC = @prix_ttc
                   FROM LIGNES_FACTURE as lc
                   JOIN  MM_ARTICLE as art ON lc.ID_Article=art.ID
                   JOIN MM_Facture as f ON lc.ID_Facture=f.ID
                   WHERE art.AR_Ref = @ref 
                     AND f.Ref = @reffacture";
SqlCommand command = new SqlCommand(requete, con);
command.Parameters.Add("@qte", qte);
command.Parameters.Add("@prix", prix);
... // Set other parameters here
command.ExecuteNonQuery();