大量界面刷新时手动GCCollect也是有必要的

Posted 2020-10-26 ZGJ

在winform窗体上拖一个flowLayoutPane，一个Button,一个用户控件UcControl,用户控件上放几十个子控件

private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                DateTime startTime = DateTime.Now;

                flowLayoutPanel1.Controls.Clear();
                for (int i = 0; i < Controlcount; i++)
                {
                    UcControl v = new UcControl();
                    v.Width = 275;
                    v.Height = 120;
                    flowLayoutPanel1.Controls.Add(v);

                }
                slExecutedTime.Text = (DateTime.Now - startTime).ToString();
            }
            catch (Exception exception)
            {
                Console.WriteLine(exception);
                throw;
            }
        }

使劲点按钮，过一会弹出创建句柄出错。解决办法，加上红色部分就好了，再使劲点也不会出问题。

private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                DateTime startTime = DateTime.Now;
                for (int i = 0; i < flowLayoutPanel1.Controls.Count; i++)
                {
                    DeleteChilds(flowLayoutPanel1.Controls[i]);
                    
                }
　　　　　　　　　GC.Collect();　
                flowLayoutPanel1.Controls.Clear();
                for (int i = 0; i < Controlcount; i++)
                {
                    UcControl v = new UcControl();
                    v.Width = 275;
                    v.Height = 120;
                    flowLayoutPanel1.Controls.Add(v);

                }
                slExecutedTime.Text = (DateTime.Now - startTime).ToString();
            }
            catch (Exception exception)
            {
                Console.WriteLine(exception);
                throw;
            }
        }

private void DeleteChilds(Control control)
        {
            foreach (Control v in control.Controls)
            {
                if (v.Controls.Count>0)
                {
                    DeleteChilds(v);
                }
                v.Dispose();
            }
        }