mvvm sample (advanced)

2023-06-21 10:59:54 +09:00
parent e60506aaf7
commit 42bc51c9e9
12 changed files with 413 additions and 1 deletions
--- a/PacticeSolution/MVVMDatabaseSample/ViewModel/ViewModelMain.cs
+++ b/PacticeSolution/MVVMDatabaseSample/ViewModel/ViewModelMain.cs
@@ -0,0 +1,160 @@
+using MVVMDatabaseSample.Model;
+using MVVMDatabaseSample.Util;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Data;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+
+namespace MVVMDatabaseSample.ViewModel
+{
+    internal class ViewModelMain : INotifyPropertyChanged
+    {
+        private Student _student = new Student();
+        private ObservableCollection<Student> _sampleData;
+        private ICommand _connectCommand;
+        private ICommand _selectCommand;
+        private ICommand _loadedCommand;
+
+        public event PropertyChangedEventHandler? PropertyChanged;
+
+        public string Name
+        {
+            get { return _student.Name; }
+            set
+            {
+                _student.Name = value;
+                OnPropertyChanged("Name");
+            }
+        }
+
+        public int Age
+        {
+            get { return _student.Age; }
+            set
+            {
+                _student.Age = value;
+                OnPropertyChanged("Age");
+            }
+        }
+
+        public string Grage
+        {
+            get { return _student.Grade; }
+            set
+            {
+                _student.Grade = value;
+                OnPropertyChanged("Grade");
+            }
+        }
+
+        public int Score
+        {
+            get { return _student.Score; }
+            set
+            {
+                _student.Score = value;
+                OnPropertyChanged("Score");
+            }
+        }
+
+        public ObservableCollection<Student> SampleData
+        {
+            get
+            {
+                if (_sampleData == null)
+                    _sampleData = new ObservableCollection<Student>();
+
+                return _sampleData;
+            }
+            set { _sampleData = value; }
+        }
+
+        public ICommand ConnectCommand
+        {
+            get
+            {
+                if (_connectCommand == null)
+                    _connectCommand = new DelegateCommand(Connect);
+
+                return _connectCommand;
+            }
+        }
+
+        public ICommand SelectCommand
+        {
+            get
+            {
+                if (_selectCommand == null)
+                    _selectCommand = new DelegateCommand(Select);
+
+                return _selectCommand;
+            }
+        }
+
+        public ICommand LoadedCommand
+        {
+            get
+            {
+                if (_loadedCommand == null)
+                    _loadedCommand = new DelegateCommand(Load);
+
+                return _loadedCommand;
+            }
+        }
+
+        private void Connect()
+        {
+            string message;
+            if (!SqlDBManager.Instance.GetConnection())
+                message = "Fail to connect";
+            else
+                message = "Success to connect";
+
+            MessageBox.Show(message);
+        }
+
+        private void Select()
+        {
+            DataSet ds = new DataSet();
+            string qry = "SELECT * FROM Student";
+            SqlDBManager.Instance.ExecuteQuery(ds, qry);
+            if (ds.Tables.Count < 1)
+                return;
+
+            foreach (DataRow row in ds.Tables[0].Rows)
+            {
+                Student student = new Student()
+                {
+                    Name = row["Name"].ToString(),
+                    Age = (int)row["Age"],
+                    Grade = row["Grade"].ToString(),
+                    Score = (int)row["Score"],
+                };
+                _sampleData.Add(student);
+            }
+        }
+
+        private void Load()
+        {
+            string message;
+            if (!SqlDBManager.Instance.GetConnection())
+                message = "Fail to connect";
+            else
+                message = "Success to connect";
+
+            MessageBox.Show(message);
+        }
+
+        protected void OnPropertyChanged(string propertyName)
+        {
+            this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}