c# - 大家好，当我计算任何数字 * 1% 时，它给了我一个很长的数字，我想将其缩减为 2 位小数 C# WPF 转换

Question

我的问题是如何将数学结果转换为两位小数的结果？{ private void BtnAjoutInteret_Click(object sender, RoutedEventArgs e)//当我按下确定按钮时

        try
        {
                for (int i = 1; i < clients.ListesClients.Count; i++)// For all the bank clients add //one percent to the sum why is it so hard to post a question on stackoverflow
                {
                    double interet = .01;
                    clients.ListesClients[i].Balance = (clients.ListesClients[i].Balance * interet) + (clients.ListesClients[i].Balance);
                    clients.AjustementCompte(clients.ListesClients[0]);//once the one percent is added use the methode to add the new balance to the txtfile.

                }


            MessageBox.Show("Transaction accepter");
            LviewListeClients.Items.Refresh();

        }
        catch (Exception)
        {

            MessageBox.Show("erreur 5 ");
            return;
        }
    }
public  void AjustementCompte(Client Nouvelle)//This is the method to add the new balance
    {
        //listeClients.Add(NouvelleTransaction);
        StreamWriter Writer = new StreamWriter(filename);
        foreach (Client client in ListesClients)
        {
            Writer.WriteLine($"{client.ID};{client.TypeDeCompte};{client.Balance}");
        }
        Writer.Close();
    } }

标签： c#wpf

Answer 1

double d = 1.2345;
string s = string.Format("{0:0.##}", d);

或直接：

double d = 1.2345;
StreamWriter Writer = new StreamWriter(filename);
Writer.WriteLine("{0:0.##}", d);

您还可以使用类似"{0,6:0.##}".

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