C# 制作(PictureBox)圆形头像框 从数据库中读取头像

Posted 2021-09-09 小马的黄金棺材板

现在只要是有关头像的框基本都是圆形的了，C#提供的PictureBox控键默认情况下是方形的非常大的影响美观

PictureBox默认情况下

比起上面的还是有一点不太好看的…

使用C#提供的类进行圆形：

工具箱拉出PictureBox

设置图片的显示模式为ZOOM

特别注意：
框的比例必须为一样不然会变椭圆的

窗体加载时：

 pictureBox1.Image = Image.FromFile(@"C:\\Users\\Administrator\\Desktop\\1.png");

为了方便演示，在窗口加载的时候加载出图片

图片加载出来后然后，把框框变圆的

 GraphicsPath gp = new GraphicsPath();
    gp.AddEllipse(pictureBox1.ClientRectangle);
Region region = new Region(gp);
  pictureBox1.Region = region;//赋值
 gp.Dispose();//释放资源
  region.Dispose();//释放资源

只有简单的几行

效果图：

一下美观了很多

接下来演示从数据库读取图片到框框上：

同样也是，写在窗口的加载事件

GraphicsPath gp = new GraphicsPath();

            gp.AddEllipse(pictureBox1.ClientRectangle);

            Region region = new Region(gp);

            pictureBox1.Region = region;

            gp.Dispose();

            region.Dispose();



            CheckForIllegalCrossThreadCalls = false;
            username.Text = 登录界面.jmuser;
            Thread th = new Thread(a);
            th.IsBackground = true;
            th.Start();
            us = username.Text;

            首页 form = new 首页();
            form.TopLevel = false;
            form.Parent = panel1;
            panel1.Controls.Add(form);//将子窗体载入panel            
            form.Show();

            SqlConnectionStringBuilder bu = new SqlConnectionStringBuilder();

            bu.Password = "0";
            bu.UserID = "0";
            bu.DataSource = "0-0";
            bu.InitialCatalog = "0";
            SqlConnection b = new SqlConnection(bu.ToString());
            string str = "select * from  user1  where  username ='" + 登录成功界面.us + "'";
            b.Open();

            SqlCommand c = new SqlCommand(str, b);

            SqlDataReader d = c.ExecuteReader();

            while (d.Read())
            {
                //  label2.Text = d["userid"].ToString();
                string s = d["头像"].ToString();
                byte[] imageBytes = Convert.FromBase64String(s);
                MemoryStream memoryStream = new MemoryStream(imageBytes, 0, imageBytes.Length);
                memoryStream.Write(imageBytes, 0, imageBytes.Length);
                Image image = Image.FromStream(memoryStream);
                this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
                this.pictureBox1.Image = image;
            }
      }

效果图：

图片是从数据库读取的，并不是本地上传的！！

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