C# 滚动条可见性
我只编写以下代码:C# 滚动条可见性,c#,winforms,C#,Winforms,我只编写以下代码: namespace Test01 { partial class Form1 { /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.IContainer components = null; /// <summary&g
namespace Test01
{
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.panel1 = new System.Windows.Forms.Panel();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.button4 = new System.Windows.Forms.Button();
this.panel1.SuspendLayout();
this.SuspendLayout();
//
// panel1
//
this.panel1.AutoScroll = true;
this.panel1.Controls.Add(this.button4);
this.panel1.Controls.Add(this.button3);
this.panel1.Controls.Add(this.button2);
this.panel1.Location = new System.Drawing.Point(24, 13);
this.panel1.Name = "panel1";
this.panel1.Size = new System.Drawing.Size(206, 43);
this.panel1.TabIndex = 0;
//
// button1
//
this.button1.Location = new System.Drawing.Point(89, 62);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 1;
this.button1.Text = "button1";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// button2
//
this.button2.Location = new System.Drawing.Point(3, 3);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(75, 23);
this.button2.TabIndex = 2;
this.button2.Text = "button2";
this.button2.UseVisualStyleBackColor = true;
//
// button3
//
this.button3.Location = new System.Drawing.Point(84, 3);
this.button3.Name = "button3";
this.button3.Size = new System.Drawing.Size(75, 23);
this.button3.TabIndex = 3;
this.button3.Text = "button3";
this.button3.UseVisualStyleBackColor = true;
//
// button4
//
this.button4.Location = new System.Drawing.Point(165, 3);
this.button4.Name = "button4";
this.button4.Size = new System.Drawing.Size(75, 23);
this.button4.TabIndex = 4;
this.button4.Text = "button4";
this.button4.UseVisualStyleBackColor = true;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(251, 98);
this.Controls.Add(this.button1);
this.Controls.Add(this.panel1);
this.Name = "Form1";
this.Text = "Form1";
this.panel1.ResumeLayout(false);
this.ResumeLayout(false);
}
#endregion
private System.Windows.Forms.Panel panel1;
private System.Windows.Forms.Button button4;
private System.Windows.Forms.Button button3;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.Button button1;
}
}
我运行它并得到以下结果:
在第一列中,我只需按一下按钮1,就可以正常工作了
在第二列,我移动滚动条并按下按钮1-按钮4消失,但滚动条仍然存在。当我折叠和打开窗口时,滚动条消失了
在第三栏,我打开经典主题,只需按下按钮1——一切正常
我已经阅读并尝试使用验证、失效、更新、刷新-但没有帮助。那么,如何解决此问题呢?尝试通过BeginInvoke调用刷新方法,使其重新进入窗口循环:
this.BeginInvoke((Action)scrollBar.PerformLayout);
从当前方法调用它(不调用)有时可以避免重新渲染。在移除按钮之前,将滚动条的位置重置为零:
private void button1_Click(object sender, EventArgs e)
{
panel1.HorizontalScroll.Value = 0;
panel1.Controls.Remove(button4);
}
panel1.HorizontalScroll.Value = 1;
panel1.HorizontalScroll.Value = 0;
panel1.Controls.Remove(button4);
编辑
我发现当滚动条的值为零时,这种方法并不总是有效的。我尝试了各种方法来强制它始终清除滚动条,但唯一可靠的方法似乎是在移除按钮之前将其值设置为1然后设置为0:
private void button1_Click(object sender, EventArgs e)
{
panel1.HorizontalScroll.Value = 0;
panel1.Controls.Remove(button4);
}
panel1.HorizontalScroll.Value = 1;
panel1.HorizontalScroll.Value = 0;
panel1.Controls.Remove(button4);
这很难看,但似乎管用。我个人认为这是框架中的一个bug 尝试用FlowLayoutPanel替换您的面板。使用与要更换的面板相同的尺寸。在FlowLayoutPanel控件上,设置
AutoScroll=True
和FlowDirection=TopDown
面板应该可以为您移动控件,您也不必担心滚动条。出于好奇,我刚刚尝试了这个,发现它与面板的问题完全相同。这种行为似乎是
AutoScroll
属性中的一个bug,它会影响所有可滚动控件。