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;

namespace Dictionary_demo
{
    public partial class Form1 : Form
    {
        Dictionary<string, string> dictDemo = new Dictionary<string, string>();
        public Form1()
        {
            InitializeComponent();
        }

        private void add_dict_Click(object sender, EventArgs e)
        {
            this.textBoxInfo.AppendText("------------- Add item -------------\r\n");
            if (dictDemo.ContainsKey(textKey.Text))
            {
                this.textBoxInfo.AppendText("Key : " + textKey.Text + " already exits!\r\n");
            }
            else
            {
                dictDemo.Add(textKey.Text, textValue.Text);
                this.textBoxInfo.AppendText("Add Key : " + textKey.Text + " \r\n");
                this.textBoxInfo.AppendText("Add Value : " + textValue.Text + " \r\n");
            }
        }

        private void btnLogClean_Click(object sender, EventArgs e)
        {
            this.textBoxInfo.Clear();
        }

        private void btnFindFromKey_Click(object sender, EventArgs e)
        {
            this.textBoxInfo.AppendText("------------- find item with Key -------------\r\n");
            textValue.Text = "";
            if (dictDemo.ContainsKey(textKey.Text))
            {
                string value = "";
                this.textBoxInfo.AppendText("Key : " + textKey.Text + " exits!\r\n");
                if (dictDemo.TryGetValue(textKey.Text, out value))
                {
                    textValue.Text = value;
                    this.textBoxInfo.AppendText("Find : " + "Key = " + textKey.Text + "Value = " + value + "\r\n");
                }
                else
                {
                    this.textBoxInfo.AppendText("Key : " + textKey.Text + " find error!\r\n");
                }
            }
            else
            {
                this.textBoxInfo.AppendText("Key : " + textKey.Text + " not exits!\r\n");
            }
        }

        private void btnFindFromValue_Click(object sender, EventArgs e)
        {
            this.textBoxInfo.AppendText("------------- find item with value -------------\r\n");
            foreach (KeyValuePair<string, string> kvp in dictDemo)
            {
                if (kvp.Value.Equals(textValue.Text))
                {
                    this.textBoxInfo.AppendText("key = " + kvp.Key + " Value = " + kvp.Value + " \r\n");
                }
            }
            this.textBoxInfo.AppendText("------------- print end   -------------\r\n");
        }

        private void btnDictPrint_Click(object sender, EventArgs e)
        {
            this.textBoxInfo.AppendText("------------- print start -------------\r\n");
            foreach (KeyValuePair<string, string> kvp in dictDemo)
            {
                this.textBoxInfo.AppendText("key = " + kvp.Key + " Value = " + kvp.Value + " \r\n");
            }
            this.textBoxInfo.AppendText("------------- print end   -------------\r\n");
        }

        private void btnDictDelete_Click(object sender, EventArgs e)
        {
            this.textBoxInfo.AppendText("------------- remove item -------------\r\n");
            dictDemo.Remove(textKey.Text);
            this.textBoxInfo.AppendText("Remove itme : Key = " + textKey.Text + " \r\n");
        }
    }
}

foreach (KeyValuePair<string, string> kvp in dictDemo)
            {
                if (kvp.Value.Equals(textValue.Text))
                {
                    this.textBoxInfo.AppendText("key = " + kvp.Key + " Value = " + kvp.Value + " \r\n");
                }
            }