C# winform base64转二进制在页面显示图片

using System;
using System.Drawing;
using System.IO;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string base64String = "";//base64
            //截取base64逗号之后的字符串
            string strbase64 = base64String.Trim().Substring(base64String.IndexOf(",") + 1);
            //base64转二进制
            byte[] bytes = Convert.FromBase64String(strbase64);
            MemoryStream memStream = new MemoryStream(bytes);

            #region  方法一
            //this.pictureBox1.Image = Image.FromStream(memStream);
            #endregion

            #region 方法二
            Bitmap bmpt = new Bitmap(memStream);
            this.pictureBox1.Image = bmpt;
            #endregion

            //PictureBox 图片自适应
            this.pictureBox1.BackgroundImageLayout = ImageLayout.Stretch;
            this.pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
        }
    }
}