mvvm sample

PacticeSolution/MVVMSample/Model/ViewModelMain.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace MVVMSample.Model
+{
+    internal class ViewModelMain : NotifierMain
+    {
+        private string _firstName;
+        private string _lastName;
+        private string _fullName;
+        private string _birthday;
+
+        private bool _isBirthdayError = false;
+
+        public string FirstName 
+        { 
+            get { return _firstName; }
+            set
+            {
+                _firstName = value;
+                _fullName = $"{_lastName} {_firstName}";
+                NotifyChanged("FirstName", "FullName");
+            }
+        }
+
+        public string LastName
+        {
+            get { return _lastName; }
+            set
+            {
+                _lastName = value;
+                _fullName = $"{_lastName} {_firstName}";
+                NotifyChanged("LastName", "FullName");
+            }
+        }
+
+        public string FullName { get { return _fullName; } }
+
+        public string Birthday
+        {
+            get { return _birthday; }
+            set
+            {
+                if (Regex.IsMatch(value, "^[0-9]*$"))
+                {
+                    _birthday = value;
+                    _isBirthdayError = false;
+                }
+                else
+                {
+                    _birthday = value;
+                    _isBirthdayError = true;
+                }
+                NotifyChanged("Birthday", "BirthdayError", "BirthdayErrorMessage");
+            }
+        }
+
+        public bool BirthdayError { get { return _isBirthdayError; } }
+
+        public string BirthdayErrorMessage
+        {
+            get
+            {
+                if (!_isBirthdayError)
+                    return $"Birthday: {_birthday}";
+                else
+                    return $"Please input the number value ({Birthday})";
+            }
+        }
+    }
+}