Question

我在C＃中创建登录应用程序，我想在单个.txt文件中保存电子邮件，用户名和密码，我该怎么做，然后在我登录时加载用户名和密码，在主窗口中加载电子邮件？

这是我的登录代码：

string dir = textBox1.Text;
            if (!Directory.Exists("data\\" + dir))
                MessageBox.Show("User Dosen't Exist!", dir);
            else
            {
                var sr = new StreamReader("data\\" + dir + "\\data.ls");

                string encusr = sr.ReadLine();
                string encpass = sr.ReadLine();
                string encemail = sr.ReadLine();
                sr.Close();

                string decusr = Encryption.Encrypt.decrypt(encusr);
                string decpass = Encryption.Encrypt.decrypt(encpass);
                string decemail = Encryption.Encrypt.decrypt(encemail);

                if (decusr == textBox1.Text && decpass == textBox2.Text)
                {

                    MessageBox.Show("Welcome To Private Area", decusr);
                    Main_Form frm = new Main_Form();
                    frm.Show();
                    this.Hide();
                }
                else
                {
                    MessageBox.Show("Password Or Username Is Wrong!", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
                }
            }

这就是保存代码：

string dir = textBox1.Text;
            Directory.CreateDirectory("Data\\" + dir);

            var sw = new StreamWriter("Data\\" + dir + "\\data.ls");

            string encusr = Encryption.Encrypt.encrypt(textBox1.Text);
            string encpass = Encryption.Encrypt.encrypt(textBox2.Text);
            string encemail = Encryption.Encrypt.encrypt(textBox3.Text);

            sw.WriteLine(encusr);
            sw.WriteLine(encpass);
            sw.WriteLine(encemail);
            sw.Close();

            MessageBox.Show("User Was Successfully Created: " + textBox1.Text);
            this.Close();

Answer 1

您可以更改Main_Form以包含如下所示的电子邮件字段：

public class Main_Form : Window
{
    public string Email { get; set; }
    // skipped rest of main form implementation
}

然后，您可以在创建Main_Form时设置电子邮件字段：

MessageBox.Show("Welcome To Private Area", decusr); Main_Form frm = new Main_Form(); frm.Email = decemail; frm.Show(); this.Hide();

Answer 2

首先，您的代码将只查找文件中的第一个条目，您应该通过执行以下操作来修复：

using (var sr = new StreamReader("data\\" + dir + "\\data.ls")){
    string line = string.Empty;
    while((line = sr.ReadLine()) != null) {
        // assume that 1 is username
        if(decusr == textBox1.Text) {
            if( (line = sr.ReadLine()) == decpass == textBox2.Text) {
                // user is logged in store email
                UserEmail = sr.ReadLine();
            }
        }
    }
}

执行此操作后，您只需将成员字段和属性添加到Main_Form中即可：

public class Main_Form : Window
{
    public string UserEmail { get; private set; }
    /*
     * Rest of your code
     */
}

编辑 :(更好的方法，但仍然使用txt文件）

更好的方法是重写保存/加载逻辑，以CSV格式存储数据：

public string ProduceLine(string username, string password, string email){
    return string.Join(";", new string[] { 
        Encryption.Encrypt.encrypt(username),
        Encryption.Encrypt.encrypt(password),
        Encryption.Encrypt.encrypt(email)
    }; // this will return something like "encrypted_username;encrypted_password;encrypted_email"
}

然后，当您加载文件时，您可以使用简单的方法进行比较：

public string TryLogin(string username, string password) {
    // this will return user email upon succesfull logging in
    using (var sr = new StreamReader("data\\" + dir + "\\data.ls")){
        string line = string.Empty;
        while((line = sr.ReadLine()) != null) {
            string[] extracted = string.Split(";");
            if(extracted[0] == Encryption.Encrypt.encrypt(username) && extracted[1] == Encryption.Encrypt.encrypt(password)) {
                return Encryption.Encrypt.decrypt(extracted[1]);
            }
        }
    }
    return string.Empty;
}

这将允许您减少方法，如：

string email = TryLogin(textBox1.Text, textBox2.Text);
if(!string.IsNullOrEmpty(email))
{
    MessageBox.Show("Welcome To Private Area", decusr);
    Main_Form frm = new Main_Form();
    frm.Show();
    this.Hide();
}
else
{
    MessageBox.Show("Password Or Username Is Wrong!", "", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

从.txt文件中保存并加载数据

2 个答案: