效果

實現

程式碼

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 WindowsFormsApp6 {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }

        /// <summary>
        /// 當點選時彈出字型對話方塊
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender,EventArgs e) {
            FontDialog fontDialog = new FontDialog();
            fontDialog.ShowDialog();

            //把在對話方塊中選中的字型賦值給文字框的字型
            textBox1.Font = fontDialog.Font;
        }

        /// <summary>
        /// 彈出顏色對話方塊
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender,EventArgs e) {
            ColorDialog colorDialog = new ColorDialog();
            colorDialog.ShowDialog();

            //把在對話方塊中選擇的顏色賦值給文字框中文字的顏色
            textBox1.ForeColor = colorDialog.Color;
        }
    }
}