每次项目 运行 时，带有 MainMenu 的表单都会缩小

Form with a MainMenu shrinks every time the project is run

每当我构建下面的程序Form1的大小缩小了20。（在某些情况下我需要对表格进行更改，例如将someLaggyControl1移动几个像素，但并非总是如此。这很奇怪。）该表格使用 MainMenu for the menu, not a MenuStrip. Yes, MainMenu is older and not recommended for use, but I need to use it for several reasons, one of which being radio-button items。更改为 MenuStrip 对我来说不是有效的解决方案。

这是重现此问题所需的代码：

Form1.designer.cs

namespace MainMenuMCVE
{
    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.MainMenu1 = new System.Windows.Forms.MainMenu(this.components);
            this.menuItem1 = new System.Windows.Forms.MenuItem();
            this.menuItem2 = new System.Windows.Forms.MenuItem();
            this.menuItem7 = new System.Windows.Forms.MenuItem();
            this.menuItem8 = new System.Windows.Forms.MenuItem();
            this.menuItem3 = new System.Windows.Forms.MenuItem();
            this.menuItem4 = new System.Windows.Forms.MenuItem();
            this.menuItem5 = new System.Windows.Forms.MenuItem();
            this.menuItem6 = new System.Windows.Forms.MenuItem();
            this.someLaggyControl1 = new MainMenuMCVE.SomeLaggyControl();
            this.SuspendLayout();
            // 
            // MainMenu1
            // 
            this.MainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
            this.menuItem1,
            this.menuItem5});
            // 
            // menuItem1
            // 
            this.menuItem1.Index = 0;
            this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
            this.menuItem2,
            this.menuItem3,
            this.menuItem4});
            this.menuItem1.Text = "Example";
            // 
            // menuItem2
            // 
            this.menuItem2.Index = 0;
            this.menuItem2.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
            this.menuItem7,
            this.menuItem8});
            this.menuItem2.Text = "Something";
            // 
            // menuItem7
            // 
            this.menuItem7.Index = 0;
            this.menuItem7.Text = "Another thing";
            // 
            // menuItem8
            // 
            this.menuItem8.Index = 1;
            this.menuItem8.Text = "Ect";
            // 
            // menuItem3
            // 
            this.menuItem3.Index = 1;
            this.menuItem3.Text = "Something else";
            // 
            // menuItem4
            // 
            this.menuItem4.Index = 2;
            this.menuItem4.Text = "A third thing";
            // 
            // menuItem5
            // 
            this.menuItem5.Index = 1;
            this.menuItem5.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
            this.menuItem6});
            this.menuItem5.Text = "Example 2";
            // 
            // menuItem6
            // 
            this.menuItem6.Index = 0;
            this.menuItem6.Text = "Blah";
            // 
            // someLaggyControl1
            // 
            this.someLaggyControl1.Laggyness = 1000;
            this.someLaggyControl1.Location = new System.Drawing.Point(12, 81);
            this.someLaggyControl1.Name = "someLaggyControl1";
            this.someLaggyControl1.Size = new System.Drawing.Size(268, 23);
            this.someLaggyControl1.TabIndex = 0;
            this.someLaggyControl1.Text = "someLaggyControl1";
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(292, 253);
            this.Controls.Add(this.someLaggyControl1);
            this.Menu = this.MainMenu1;
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);

        }

        #endregion

        private System.Windows.Forms.MainMenu MainMenu1;
        private System.Windows.Forms.MenuItem menuItem1;
        private System.Windows.Forms.MenuItem menuItem2;
        private System.Windows.Forms.MenuItem menuItem3;
        private System.Windows.Forms.MenuItem menuItem4;
        private System.Windows.Forms.MenuItem menuItem5;
        private System.Windows.Forms.MenuItem menuItem6;
        private System.Windows.Forms.MenuItem menuItem7;
        private System.Windows.Forms.MenuItem menuItem8;
        private SomeLaggyControl someLaggyControl1;
    }
}

SomeLaggyControl.cs

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

namespace MainMenuMCVE
{
    class SomeLaggyControl : Control
    {
        public int Laggyness { get; set; }

        protected override void OnPaint(PaintEventArgs e) {
            e.Graphics.DrawString("A laggy control that takes " + Laggyness + " ms to render", this.Font, Brushes.Black, 0, 0);
            System.Threading.Thread.Sleep(Laggyness);
            base.OnPaint(e);
        }
    }
}

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

Program.cs:

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

namespace MainMenuMCVE
{
    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());
        }
    }
}

这个的关键部分是一个表单，Form1，它包含一个 MainMenu，它有几个 MenuItem，其中一个有几个子 MenuItems。它还包含 SomeLaggyControl，（当然）用作示例。 SomeLaggyControl 需要 1 秒来呈现并用于模拟一堆控件，以便示例不会变得混乱。

每当我 运行 程序时，Form1 的大小都会缩小。我可能需要更改表格以使其缩小（例如移动 someLaggyControl1），或者我可能不需要；我相信这必须处理设计人员生成新代码的问题。无论如何，这会导致形状缩小。

这里有一些图片展示了这一点：


The original appearance of the form, before building, with a size of 300 by 300.


After the first rebuild. It's not obvious, but the size is now 300 by 280. Check the scroll bar.


After a second rebuild. The form is now 300 by 260, and it's more obvious.


After a third rebuild. Now that it's 300 by 240, the form is getting small.


After several more rebuilds, I am left with this pleasant piece of easy to use 300 by 47 form. The form is unable to shrink anymore (though it tries).

我的主要问题是：如何阻止我的表单调整大小（除了切换到 MenuStrip）？我也很想知道为什么会这样，但这并不重要。

您可以尝试将 minimumSize 设置为您希望表单的大小。这样表单就永远不会变小，但可以根据需要变大。因此，如果您需要表格为 300,300，也将最小尺寸更改为 300,300。

旧菜单系统中有一些内置的东西，当它附加到菜单时，菜单系统的高度会增加窗体的大小 属性 使用设计器时。

要解决此问题，请进入 Designer.cs 文件，注释掉这一行：

// this.Menu = this.MainMenu1;

然后，在 OnLoad 覆盖中，重新附加它：

protected override void OnLoad(EventArgs e) {
  base.OnLoad(e);
  this.Menu = MainMenu1;
}

菜单在设计器中不可见，除非您从表单区域下方的组件托盘中 select 菜单。您会注意到菜单在表单上变得可见，并且在菜单可见时表单的大小会暂时 增加。这似乎可以防止您的表单始终自行调整大小。