c# - winforms标签闪烁

Question

我的 Label 控件有一个问题，它闪烁得非常厉害。

下面是一些重现问题的代码。

如何解决？

更新:前一个案例(一个表单直接包含一个标签)的解决方案是使 form.DoubleBuffered = true。但这不是通用的解决方案。比如 label inside a SplitContainer 怎么办？这是我的真实案例。

更新代码:

双缓冲标签.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace FlickerLabelTest
{
    public class DoubleBufferedLabel : Label
    {
        public DoubleBufferedLabel()
        {
            DoubleBuffered = true;
        }
    }
}

DoubleBufferedSplitContainer.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace FlickerLabelTest
{
    public class DoubleBufferedSplitContainer : SplitContainer
    {
        public DoubleBufferedSplitContainer()
        {
            DoubleBuffered = true;
        }
    }
}

Form1.cs:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

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

        private void timer1_Tick(object sender, EventArgs e)
        {
            label1.Text += "0";
        }
    }
}

Form1.Designer.cs:

namespace FlickerLabelTest
{
    partial class Form1
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.components = new System.ComponentModel.Container();
            this.timer1 = new System.Windows.Forms.Timer(this.components);
            this.label1 = new FlickerLabelTest.DoubleBufferedLabel();
            this.splitContainer1 = new DoubleBufferedSplitContainer();
            this.splitContainer1.Panel2.SuspendLayout();
            this.splitContainer1.SuspendLayout();
            this.SuspendLayout();
            // 
            // timer1
            // 
            this.timer1.Enabled = true;
            this.timer1.Interval = 1;
            this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
            // 
            // label1
            // 
            this.label1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.label1.Location = new System.Drawing.Point(0, 0);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(186, 262);
            this.label1.TabIndex = 0;
            this.label1.Text = "label1";
            // 
            // splitContainer1
            // 
            this.splitContainer1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.splitContainer1.Location = new System.Drawing.Point(0, 0);
            this.splitContainer1.Name = "splitContainer1";
            // 
            // splitContainer1.Panel2
            // 
            this.splitContainer1.Panel2.Controls.Add(this.label1);
            this.splitContainer1.Size = new System.Drawing.Size(284, 262);
            this.splitContainer1.SplitterDistance = 94;
            this.splitContainer1.TabIndex = 1;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 262);
            this.Controls.Add(this.splitContainer1);
            this.DoubleBuffered = true;
            this.Name = "Form1";
            this.Text = "Form1";
            this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
            this.splitContainer1.Panel2.ResumeLayout(false);
            this.splitContainer1.ResumeLayout(false);
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.Timer timer1;
        private DoubleBufferedLabel label1;
        private DoubleBufferedSplitContainer splitContainer1;
    }
}

程序.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;

namespace FlickerLabelTest
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}

Answer 1

问题出在对接上。如果将 Label.Dock 从 Fill 更改为 None，请手动设置标签的大小以填充拆分面板，然后将其锚定在所有方面，它不会闪烁。

如果您想查看闪烁的原因，同时 Dock 仍设置为 Fill，请覆盖 中的 OnResize DoubleBufferedLabel 类，启动应用程序，并在它运行时在 OnResize 中设置一个断点。为 Size 添加一个 watch，您会看到它在设计时和运行时大小之间切换。

我尝试在您的示例中使用常规 SplitContainer 和 Label，在表单上将 DoubleBuffer 设置为 False ，如果我将 Label 上的 Dock 设置为 None，它也不会闪烁。