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Question

我有一个需要在运行时手动调整大小的用户控件，尽管我希望应用边距。我从下面的 link 1 中发现，要使边距正常工作，需要将 AutoSize 属性设置为 true。虽然，因为我需要在运行时手动调整控件的大小，所以根据我的理解，AutoSize 属性需要是假的。

用户控件 (Accordion) 包含一个水平拆分面板，其中第一个面板包含一个按钮，第二个面板包含一个面板控件。在下图中，您可以看到多个 "Accordions"，在图片中，它是其中一个按钮。手风琴停靠在容器的顶部。目的是当我单击按钮时它会调整大小并显示 "contents panel" 和内容面板的控件。我的问题是设置用户控件的边距属性不会导致它们自动与其他控件或它们所在的容器保持距离。

Link 1: WinForm Bottom Margin Property Doesn't Do Anything

希望我正在使用的一些有用的块。

namespace CustomControls
{
partial class Accordion
{
    /// <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 Component 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.split = new System.Windows.Forms.SplitContainer();
        this.ToggleCollapse = new System.Windows.Forms.PictureBox();
        this.MainButton = new System.Windows.Forms.Button();
        this.contentsPanel = new System.Windows.Forms.Panel();
        ((System.ComponentModel.ISupportInitialize)(this.split)).BeginInit();
        this.split.Panel1.SuspendLayout();
        this.split.Panel2.SuspendLayout();
        this.split.SuspendLayout();
        ((System.ComponentModel.ISupportInitialize)(this.ToggleCollapse)).BeginInit();
        this.SuspendLayout();
        // 
        // split
        // 
        this.split.Dock = System.Windows.Forms.DockStyle.Fill;
        this.split.FixedPanel = System.Windows.Forms.FixedPanel.Panel1;
        this.split.IsSplitterFixed = true;
        this.split.Location = new System.Drawing.Point(0, 0);
        this.split.Margin = new System.Windows.Forms.Padding(3, 3, 3, 10);
        this.split.Name = "split";
        this.split.Orientation = System.Windows.Forms.Orientation.Horizontal;
        // 
        // split.Panel1
        // 
        this.split.Panel1.Controls.Add(this.ToggleCollapse);
        this.split.Panel1.Controls.Add(this.MainButton);
        this.split.Panel1MinSize = 0;
        // 
        // split.Panel2
        // 
        this.split.Panel2.Controls.Add(this.contentsPanel);
        this.split.Size = new System.Drawing.Size(663, 488);
        this.split.SplitterDistance = 40;
        this.split.TabIndex = 0;
        // 
        // ToggleCollapse
        // 
        this.ToggleCollapse.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));
        this.ToggleCollapse.BackColor = System.Drawing.SystemColors.ActiveCaption;
        this.ToggleCollapse.Enabled = false;
        this.ToggleCollapse.Image = global::CustomControls.Properties.Resources.TrianglePointer;
        this.ToggleCollapse.Location = new System.Drawing.Point(621, 13);
        this.ToggleCollapse.Name = "ToggleCollapse";
        this.ToggleCollapse.Size = new System.Drawing.Size(39, 24);
        this.ToggleCollapse.SizeMode = System.Windows.Forms.PictureBoxSizeMode.CenterImage;
        this.ToggleCollapse.TabIndex = 0;
        this.ToggleCollapse.TabStop = false;
        // 
        // MainButton
        // 
        this.MainButton.AutoEllipsis = true;
        this.MainButton.BackColor = System.Drawing.SystemColors.ActiveCaption;
        this.MainButton.Dock = System.Windows.Forms.DockStyle.Fill;
        this.MainButton.FlatAppearance.BorderColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(255)))), ((int)(((byte)(192)))));
        this.MainButton.FlatAppearance.BorderSize = 3;
        this.MainButton.FlatStyle = System.Windows.Forms.FlatStyle.Popup;
        this.MainButton.Font = new System.Drawing.Font("Verdana", 18F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
        this.MainButton.ImageAlign = System.Drawing.ContentAlignment.MiddleRight;
        this.MainButton.Location = new System.Drawing.Point(0, 0);
        this.MainButton.Name = "MainButton";
        this.MainButton.Size = new System.Drawing.Size(663, 40);
        this.MainButton.TabIndex = 0;
        this.MainButton.Text = "Accordion Activator";
        this.MainButton.TextAlign = System.Drawing.ContentAlignment.BottomLeft;
        this.MainButton.UseVisualStyleBackColor = false;
        this.MainButton.MouseDown += new System.Windows.Forms.MouseEventHandler(this.MainButton_MouseDown);
        this.MainButton.MouseEnter += new System.EventHandler(this.MainButton_MouseEnter);
        this.MainButton.MouseLeave += new System.EventHandler(this.MainButton_MouseLeave);
        this.MainButton.MouseUp += new System.Windows.Forms.MouseEventHandler(this.MainButton_MouseUp);
        // 
        // contentsPanel
        // 
        this.contentsPanel.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
        this.contentsPanel.Dock = System.Windows.Forms.DockStyle.Fill;
        this.contentsPanel.Location = new System.Drawing.Point(0, 0);
        this.contentsPanel.Name = "contentsPanel";
        this.contentsPanel.Size = new System.Drawing.Size(663, 444);
        this.contentsPanel.TabIndex = 0;
        this.contentsPanel.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Panel_MouseDown);
        this.contentsPanel.MouseLeave += new System.EventHandler(this.Panel_MouseLeave);
        this.contentsPanel.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Panel_MouseMove);
        this.contentsPanel.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Panel_MouseUp);
        // 
        // Accordion
        // 
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Inherit;
        this.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
        this.Controls.Add(this.split);
        this.DoubleBuffered = true;
        this.Margin = new System.Windows.Forms.Padding(3, 3, 3, 10);
        this.Name = "Accordion";
        this.Size = new System.Drawing.Size(663, 488);
        this.split.Panel1.ResumeLayout(false);
        this.split.Panel2.ResumeLayout(false);
        ((System.ComponentModel.ISupportInitialize)(this.split)).EndInit();
        this.split.ResumeLayout(false);
        ((System.ComponentModel.ISupportInitialize)(this.ToggleCollapse)).EndInit();
        this.ResumeLayout(false);

    }

    #endregion

    private System.Windows.Forms.SplitContainer split;
    private System.Windows.Forms.Button MainButton;
    private System.Windows.Forms.PictureBox ToggleCollapse;
    protected System.Windows.Forms.Panel contentsPanel;
}
}

这是我手动调整大小的时间和方式

       public bool Collapsed
       {
        get
        {
            return split.Panel2Collapsed;
        }
        set
        {
            Freeze(true);
            if (Dock == DockStyle.Fill && this.DesignMode)
            {
                if (firstResize)
                {
                    if (value)
                        this.Parent.Height = MainButtonHeight;
                    else
                        this.Parent.Height = ExpandedHeight;
                }
                else
                {
                    if (value)
                        CollapseAnimation(1);
                    else
                        ExpandAnimation(5);
                }
            }
            else
            {
                if (firstResize)
                {
                    if (value)
                        this.Height = MainButtonHeight;
                    else
                        this.Height = ExpandedHeight;
                    if (loadBegan)
                        firstResize = !firstResize;
                }
                else
                {
                    if (value)
                        CollapseAnimation(1);
                    else
                        ExpandAnimation(5);
                }
            }
            split.Panel2Collapsed = value;
            ToggleCollapse.Image = toggleImageNeutral;
            Freeze(false);
        }
    }

Answer 1

不确定我是否完全理解您的问题，但也许这会有所帮助。如果您希望在调整大小后在控件周围保留固定边距（由于 SplitContainer 面板 extending/collapsing），您可以试试这个：

在您的空白用户控件上拖动一个 Panel 控件并将其 Margin 设置为 (0,0,0,0) 并将 Padding 设置为 (x,x,x,x)，其中 x 是您设置的边距宽度想。

在计算子控件的高度以调整控件大小时要小心，如果您在某些子控件上设置了内边距和边距，请始终将它们考虑在内。

更新：

如此处所述：https://docs.microsoft.com/en-us/dotnet/api/system.windows.forms.control.margin?view=netframework-4.8

"Setting the Margin property on a docked control has no effect on the distance of the control from the edges of its container."

因此，我认为您必须选择特定的容器，例如 TableLayoutPanel 或 FlowLayoutPanel。尝试使用 FlowLayoutPanel 并将其设置为：

AutoSize = true;
BorderStyle = FixedSingle（只是为了看边距是否保持正确）
FlowDirection = TopDown

然后将一些控件拖入其中，将 AutoSize 属性设置为 false 并根据需要设置边距。你应该得到这样的东西：

注意：您的控件的高度可能仍然会改变（也许设置一个最小控件高度会有所帮助），但是一旦您设置了它们的宽度，FlowLayoutPanel 控件就不能因为边距而切割控件。

未应用保证金

Margin is not being applied

c#

user-controls

winforms