我在下面的代码中找不到错误。单击按钮后,Windows的蓝色圆圈旋转,几秒钟后返回VS2017。没有错误和警告。 State.ToString()返回'Open',所以我确实与DB有连接。我做错了什么?
public sealed partial class MainPage : Page
{
const string connString = "server=my_server;pwd=pass;uid=user_id;database=mydb;persistsecurityinfo=True";
MySqlConnection conn = new MySqlConnection(connString);
public MainPage()
{
this.InitializeComponent();
}
private void DbConnection()
{
try
{
conn.Open();
}
catch (MySqlException e)
{
throw;
}
}
private bool DataValidation(string user, string pass)
{
DbConnection();
MySqlCommand cmd = new MySqlCommand("SELECT Username, Password FROM Users WHERE Username=@user AND Password=@pass;");
cmd.Parameters.AddWithValue("@user", user);
cmd.Parameters.AddWithValue("@pass", pass);
cmd.Connection = conn;
MySqlDataReader login = cmd.ExecuteReader();
if (login.Read())
{
conn.Close();
return true;
}
else
{
conn.Close();
return false;
}
}
private void LoginBtn_Click(object sender, RoutedEventArgs e)
{
string user = UserTextBox.Text;
string pass = PassTextBox.Text;
if (user == "" || pass == "")
{
StatusTextBlock.Text = ("No emty fields allowed. Try again...");
return;
}
bool loginSuccessful = DataValidation(user, pass);
if (loginSuccessful)
{
this.Frame.Navigate(typeof(Page2), null);
}
else
{
StatusTextBlock.Text = "Invalid e-mail or password. Try again...";
}
}
}
答案 0 :(得分:-1)
完整的工作解决方案:
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