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我想将控件发送到其容器的背面。无论从同一个容器中创建和删除其他一些控件，我都不希望这个控件失去它的位置。

我没有更好的方法来实现这一点：

// Force this control to stay back 
private void panel1_ControlAdded(object sender, ControlEventArgs e) 
{
    pictureBox1.SendToBack(); 
}

这对我来说看起来有点过分了。这是实现这一目标的更好方法吗？

编辑：

有人告诉我，controls.add 默认将控件放在前面。我无法重现这种行为，或者我在某处错过了重点。这是我尝试过的：

using System;
using System.Drawing;
using System.Windows.Forms;

namespace WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        System.Windows.Forms.Button button1;

        public Form1() { InitializeComponent(); }

        void InitializeComponent()
        {
            this.button1 = new System.Windows.Forms.Button();
            this.pictureBox1 = new System.Windows.Forms.PictureBox();
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(225, 182);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(139, 39);
            this.button1.TabIndex = 0;
            this.button1.Text = "button1";
            this.button1.UseVisualStyleBackColor = true;
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // pictureBox1
            // 
            this.pictureBox1.Image = global::WindowsFormsApplication4.Properties.Resources.Tulips;
            this.pictureBox1.Location = new System.Drawing.Point(36, 26);
            this.pictureBox1.Name = "pictureBox1";
            this.pictureBox1.Size = new System.Drawing.Size(299, 175);
            this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
            this.pictureBox1.TabIndex = 1;
            this.pictureBox1.TabStop = false;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(376, 233);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.pictureBox1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.Load += new System.EventHandler(this.Form1_Load);
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
            this.ResumeLayout(false);

        }

        private PictureBox pictureBox1;

        Point xy;

        // Add a button or anything else
        private void button1_Click(object sender, EventArgs e)
        {
            var ctl = new Button();
            ctl.Location = xy;

            this.Controls.Add(ctl);

            xy.Offset(10, 10);
        }

        // First of all, send the picture box to back
        private void Form1_Load(object sender, EventArgs e)
        {
            pictureBox1.SendToBack();
        }
    }
}

因此，您可以注意到，当我多次点击 button1 时，新添加的按钮（可以用文本框替换...）位于已在 Load 事件中发送回的图片框后面。所以我绝对不能依赖 Control.Add 假定的默认行为。

在此处输入图像描述

4

1 回答 1

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由于经过几天的测试，这个技巧似乎做得很好，我觉得没有必要进一步挖掘。

// Force this control to stay back  
private void panel1_ControlAdded(object sender, ControlEventArgs e)  
{ 
    pictureBox1.SendToBack();  
}

但是，我仍然想知道为什么 Control.Add 没有按应有的方式行事。

于 2012-09-11T10:14:50.717 回答