Question

我想在文本框中按下回车键时模拟按钮单击。我之前也使用过这个，但它现在似乎没有用。

请检查我在下面使用的代码，如果我错过了什么，请告诉我。我已经离开编码差不多一年了，也许我错过了什么？

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlServerCe;

namespace WindowsFormsApplication1
{


    public partial class Form1 : Form
    {
        String uname, password, query;
        int counter = 0;

        public Form1()
        {
            InitializeComponent();

        }

        private void login_Click(object sender, EventArgs e)
        {
            verify();          
        }
        private void pass_KeyDown(Object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                verify();
            }
        }

        private void verify()
        {
            uname = name.Text;  //Initialize variables
            password = pass.Text;

            uname = uname.Trim();   //Sanitize input
            password = password.Trim();

            query = "SELECT * FROM login WHERE uname = @uname AND pass = @pass";

            string conString = Properties.Settings.Default.libConnectionString;
            using (SqlCeConnection conn = new SqlCeConnection(conString))
            {
                conn.Open();
                using (SqlCeCommand cmd = new SqlCeCommand(query, conn))
                {
                    cmd.Parameters.AddWithValue("@uname", uname);
                    cmd.Parameters.AddWithValue("@pass", password);
                    cmd.ExecuteNonQuery();

                    SqlCeDataReader reader = cmd.ExecuteReader();
                    while (reader.Read())
                    {
                        counter = 1;
                        Variables.username = reader["uname"].ToString();
                        Variables.passw = reader["pass"].ToString();
                        if (reader["regid"].ToString() != null)
                        {
                            Variables.regid = reader["regid"].ToString();
                        }
                        MessageBox.Show(Variables.username + ", you are now logged in!");
                    }

                    if (counter == 0)
                    {
                        MessageBox.Show("Invalid details");
                    }
                }
            }
        }


    }
}

我在IDE Visual Studio 2012中用C＃编码

Answer 1

每当您创建一个有意处理事件的方法时，您需要确保将该方法注册为所需事件的处理程序。如果您没有这样做，程序将不会猜测您的方法是一个事件处理程序。

Answer 2

试试这个：

 if (args.KeyCode == Keys.Return)
        {
           login_Click.PerformClick();
        }

按下回车键时不会触发按钮单击

2 个答案: