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我是 C# 编码的新手,因此我在开始我的项目时犯了一些错误。这意味着我所有的代码都是在表单中完成的(连接到数据库、执行选择语句和即将进行的更新/插入/删除)。其次,我的大部分代码都是重复的。如代码所示,我有几种几乎相同的形式(唯一的区别是在不同的表上进行选择)。
这是来自名为 Character 的表单:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using MySql.Data.MySqlClient;
namespace Dark_Heresy
{
/// <summary>
/// Interaction logic for Character.xaml
/// </summary>
public partial class Character : Window
{
public Character()
{
InitializeComponent();
}
private void character_name_loader(object sender, RoutedEventArgs e)
{
string constring = "datasource= localhost; port=3306; username=root; password=Mypass;";
string Query = "SELECT Name_ FROM dark_heresy.character_";
MySqlConnection conDataBase = new MySqlConnection(constring);
MySqlCommand cmdDatabase = new MySqlCommand(Query, conDataBase);
MySqlDataReader myReader;
try
{
conDataBase.Open();
myReader = cmdDatabase.ExecuteReader();
while (myReader.Read())
{
string charactername = myReader.GetString("Name_");
cb_CharacterName.Items.Add(charactername);
}
}
catch (Exception ex)
{
MessageBox.Show("Error: \r\n" + ex);
}
}
private void cb_CharacterName_DropDownClosed(object sender, EventArgs e)
{
string constring = "datasource = localhost; port = 3306; username = root; password = MyPass;";
string Query = "SELECT * FROM dark_heresy.character_ WHERE Name_='" + cb_CharacterName.Text + "' ;";
MySqlConnection conDataBase = new MySqlConnection(constring);
MySqlCommand cmdDataBase = new MySqlCommand(Query, conDataBase);
MySqlDataReader myReader;
try
{
conDataBase.Open();
myReader = cmdDataBase.ExecuteReader();
while (myReader.Read())
{
string career = myReader.GetString("Class");
string world = myReader.GetString("World_Type");
string strength = myReader.GetInt32("Str").ToString();
string weaponskill = myReader.GetInt32("WS").ToString();
string ballisticskill = myReader.GetInt32("BS").ToString();
string fellowship = myReader.GetInt32("Fel").ToString();
string perception = myReader.GetInt32("Per").ToString();
string intelligence = myReader.GetInt32("Int_").ToString();
string agility = myReader.GetInt32("Agi").ToString();
string willpower = myReader.GetInt32("WP").ToString();
string toughness = myReader.GetInt32("Tough").ToString();
TextCareer.Text = career;
TextWorld.Text = world;
TextStrength.Text = strength;
TextWeaponskill.Text = weaponskill;
TextBallisticskill.Text = ballisticskill;
TextFellowship.Text = fellowship;
TextPerception.Text = perception;
TextIntelligence.Text = intelligence;
TextAgility.Text = agility;
TextWillpower.Text = willpower;
TextToughness.Text = toughness;
}
}
catch (Exception ex)
{
MessageBox.Show("Error: \r\n" + ex);
}
}
private void cb_Talent_NameDropDownOpen(object sender, EventArgs e)
{
string constring = "datasource= localhost; port=3306; username=root; password=MyPass;";
string Query = "SELECT Talent_Name FROM dark_heresy.learned_talents WHERE Character_Name='" + cb_CharacterName.Text + "' ;";
MySqlConnection conDataBase = new MySqlConnection(constring);
MySqlCommand cmdDatabase = new MySqlCommand(Query, conDataBase);
MySqlDataReader myReader;
try
{
conDataBase.Open();
myReader = cmdDatabase.ExecuteReader();
while (myReader.Read())
{
string talent_name = myReader.GetString("Talent_Name");
Talent_Name.Items.Add(talent_name);
}
}
catch (Exception ex)
{
MessageBox.Show("Error: \r\n" + ex);
}
}
private void cb_Talent_Name_DropDownClosed(object sender, EventArgs e)
{
string constring = "datasource = localhost; port = 3306; username = root; password = MyPass;";
string Query = "SElECT learned_talents.Talent_Name , talents.Description FROM dark_heresy.learned_talents, dark_heresy.talents WHERE learned_talents.Talent_Name = talents.TalentName AND learned_talents.Character_Name = '" + cb_CharacterName.Text + "';";
MySqlConnection conDataBase = new MySqlConnection(constring);
MySqlCommand cmdDataBase = new MySqlCommand(Query, conDataBase);
MySqlDataReader myReader;
try
{
conDataBase.Open();
myReader = cmdDataBase.ExecuteReader();
Talent_Name.Items.Clear();
while (myReader.Read())
{
string talents_description = myReader.GetString("Description");
Talents_Description.Text = talents_description;
}
}
catch (Exception ex)
{
MessageBox.Show("Error: \r\n" + ex);
}
}
private void Skill_Name_DropDownOpened(object sender, EventArgs e)
{
string constring = "datasource= localhost; port=3306; username=root; password=MyPass;";
string Query = "SELECT Skill_Name FROM dark_heresy.learned_skills WHERE Character_Name='" + cb_CharacterName.Text + "' ;";
MySqlConnection conDataBase = new MySqlConnection(constring);
MySqlCommand cmdDatabase = new MySqlCommand(Query, conDataBase);
MySqlDataReader myReader;
try
{
conDataBase.Open();
myReader = cmdDatabase.ExecuteReader();
while (myReader.Read())
{
string skill_name = myReader.GetString("Skill_Name");
Skill_Name.Items.Add(skill_name);
}
}
catch (Exception ex)
{
MessageBox.Show("Error: \r\n" + ex);
}
}
private void Skill_Name_DropDownClosed(object sender, EventArgs e)
{
string constring = "datasource = localhost; port = 3306; username = root; password = MyPass;";
string Query = "SElECT learned_skills.Skill_Name , skills.Descriptor FROM dark_heresy.learned_skills, dark_heresy.skills WHERE learned_skills.Skill_Name = skills.SkillName AND learned_skills.Character_Name = '" + cb_CharacterName.Text + "';";
MySqlConnection conDataBase = new MySqlConnection(constring);
MySqlCommand cmdDataBase = new MySqlCommand(Query, conDataBase);
MySqlDataReader myReader;
try
{
conDataBase.Open();
myReader = cmdDataBase.ExecuteReader();
Skill_Name.Items.Clear();
while (myReader.Read())
{
string skills_description = myReader.GetString("Descriptor");
Skill_Description.Text = skills_description;
}
}
catch (Exception ex)
{
MessageBox.Show("Error: \r\n" + ex);
}
}
}
}
一种叫做 Talents 的形式:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using MySql.Data.MySqlClient;
namespace Dark_Heresy
{
/// <summary>
/// Interaction logic for Talents.xaml
/// </summary>
public partial class Talents : Window
{
public Talents()
{
InitializeComponent();
}
private void cb_loader(object sender, RoutedEventArgs e)
{
string constring = "datasource= localhost; port=3306; username=root; password=MyPass;";
string Query = "SELECT TalentName FROM dark_heresy.talents";
MySqlConnection conDataBase = new MySqlConnection(constring);
MySqlCommand cmdDatabase = new MySqlCommand(Query, conDataBase);
MySqlDataReader myReader;
try
{
conDataBase.Open();
myReader = cmdDatabase.ExecuteReader();
while (myReader.Read())
{
string talentname = myReader.GetString("TalentName");
cb_Talents.Items.Add(talentname);
}
}
catch (Exception ex)
{
MessageBox.Show("Error: \r\n" + ex);
}
}
private void cb_Talent_DropDownClosed_(object sender, EventArgs e)
{
string constring = "datasource = localhost; port = 3306; username = root; password = MyPass;";
string Query = "SELECT * FROM dark_heresy.talents WHERE TalentName='" + cb_Talents.Text + "' ;";
MySqlConnection conDataBase = new MySqlConnection(constring);
MySqlCommand cmdDataBase = new MySqlCommand(Query, conDataBase);
MySqlDataReader myReader;
try
{
conDataBase.Open();
myReader = cmdDataBase.ExecuteReader();
while (myReader.Read())
{
string description = myReader.GetString("Description");
string strength = myReader.GetInt32("R_Str").ToString();
string weaponskill = myReader.GetInt32("R_WS").ToString();
string ballisticskill = myReader.GetInt32("R_BS").ToString();
string fellowship = myReader.GetInt32("R_Fel").ToString();
string perception = myReader.GetInt32("R_Per").ToString();
string intelligence = myReader.GetInt32("R_Int").ToString();
string agility = myReader.GetInt32("R_Agi").ToString();
string willpower = myReader.GetInt32("R_WP").ToString();
string toughness = myReader.GetInt32("R_Tough").ToString();
TextDescription.Text = description;
TextStrength.Text = strength;
TextWeaponskill.Text = weaponskill;
TextBallisticskill.Text = ballisticskill;
TextFellowship.Text = fellowship;
TextPerception.Text = perception;
TextIntelligence.Text = intelligence;
TextAgility.Text = agility;
TextWillpower.Text = willpower;
TextToughness.Text = toughness;
}
}
catch (Exception ex)
{
MessageBox.Show("Error: \r\n" + ex);
}
}
}
}
我发现我需要在我的项目中做一些业务逻辑。这让我想到了 MVVM,这意味着我的项目完全做错了。
目前我唯一的引用是mysql.dll
我已经阅读/看过有关 MVVM 的教程,但是我有一些问题。
如果我使用 MVVM 模式,我与 SELECT/UPDATE/INSERT/DELETE 的数据库连接是否会存储在 ViewModel(业务逻辑)中?还是模型的一部分?
任何人都可以向我解释如何更改当前代码以便它可以从模型使用到 ViewModel 再到 View 吗?如果可能,请举个例子。
Model、ViewModel应该以什么形式存在? WPF、接口(interface)、类、类库等
有没有人有一些有用的链接可以帮助我解决这个问题,特别是当它与作为本地主机的 MySQL 数据库结合使用时。