C# Winform 实现自定义半透明loading加载遮罩层

在网页中通过div+css实现半透明效果不难，今天我们看看一种在winfrom中实现的方法：

效果图如下，正常时：



显示遮罩层时：



自定义遮罩层控件的源码如下：

View Row Code

1	using System;
2	using System.Drawing;
3	using System.Windows.Forms;
4	using System.ComponentModel;
5
6	namespace MyOpaqueLayer
7	{
8	/// <summary>
9	/// 自定义控件:半透明控件
10	/// </summary>
11	/*
12	* [ToolboxBitmap(typeof(MyOpaqueLayer))]
13	* 用于指定当把你做好的自定义控件添加到工具栏时，工具栏显示的图标。
14	* 正确写法应该是
15	* [ToolboxBitmap(typeof(XXXXControl),"xxx.bmp")]
16	* 其中XXXXControl是你的自定义控件，"xxx.bmp"是你要用的图标名称。
17	*/
18	[ToolboxBitmap(typeof(MyOpaqueLayer))]
19	public class MyOpaqueLayer : System.Windows.Forms.Control
20	{
21	private bool _transparentBG = true;//是否使用透明
22	private int _alpha = 125;//设置透明度
23
24	private System.ComponentModel.Container components = new System.ComponentModel.Container();
25
26	public MyOpaqueLayer()
27	: this(125, true)
28	{
29	}
30
31	public MyOpaqueLayer(int Alpha, bool IsShowLoadingImage)
32	{
33	SetStyle(System.Windows.Forms.ControlStyles.Opaque, true);
34	base.CreateControl();
35
36	this._alpha = Alpha;
37	if (IsShowLoadingImage)
38	{
39	PictureBox pictureBox_Loading = new PictureBox();
40	pictureBox_Loading.BackColor = System.Drawing.Color.White;
41	pictureBox_Loading.Image = 加载中.Properties.Resources.loading;
42	pictureBox_Loading.Name = "pictureBox_Loading";
43	pictureBox_Loading.Size = new System.Drawing.Size(48, 48);
44	pictureBox_Loading.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
45	Point Location = new Point(this.Location.X + (this.Width - pictureBox_Loading.Width) / 2, this.Location.Y + (this.Height - pictureBox_Loading.Height) / 2);//居中
46	pictureBox_Loading.Location = Location;
47	pictureBox_Loading.Anchor = AnchorStyles.None;
48	this.Controls.Add(pictureBox_Loading);
49	}
50	}
51
52
53	protected override void Dispose(bool disposing)
54	{
55	if (disposing)
56	{
57	if (!((components == null)))
58	{
59	components.Dispose();
60	}
61	}
62	base.Dispose(disposing);
63	}
64
65	/// <summary>
66	/// 自定义绘制窗体
67	/// </summary>
68	/// <param name="e"></param>
69	protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
70	{
71	float vlblControlWidth;
72	float vlblControlHeight;
73
74	Pen labelBorderPen;
75	SolidBrush labelBackColorBrush;
76
77	if (_transparentBG)
78	{
79	Color drawColor = Color.FromArgb(this._alpha, this.BackColor);
80	labelBorderPen = new Pen(drawColor, 0);
81	labelBackColorBrush = new SolidBrush(drawColor);
82	}
83	else
84	{
85	labelBorderPen = new Pen(this.BackColor, 0);
86	labelBackColorBrush = new SolidBrush(this.BackColor);
87	}
88	base.OnPaint(e);
89	vlblControlWidth = this.Size.Width;
90	vlblControlHeight = this.Size.Height;
91	e.Graphics.DrawRectangle(labelBorderPen, 0, 0, vlblControlWidth, vlblControlHeight);
92	e.Graphics.FillRectangle(labelBackColorBrush, 0, 0, vlblControlWidth, vlblControlHeight);
93	}
94
95
96	protected override CreateParams CreateParams//v1.10
97	{
98	get
99	{
100	CreateParams cp = base.CreateParams;
101	cp.ExStyle |= 0x00000020; //0x20; // 开启 WS_EX_TRANSPARENT,使控件支持透明
102	return cp;
103	}
104	}
105
106	/*
107	* [Category("myOpaqueLayer"), Description("是否使用透明,默认为True")]
108	* 一般用于说明你自定义控件的属性（Property）。
109	* Category用于说明该属性属于哪个分类，Description自然就是该属性的含义解释。
110	*/
111	[Category("MyOpaqueLayer"), Description("是否使用透明,默认为True")]
112	public bool TransparentBG
113	{
114	get
115	{
116	return _transparentBG;
117	}
118	set
119	{
120	_transparentBG = value;
121	this.Invalidate();
122	}
123	}
124
125	[Category("MyOpaqueLayer"), Description("设置透明度")]
126	public int Alpha
127	{
128	get
129	{
130	return _alpha;
131	}
132	set
133	{
134	_alpha = value;
135	this.Invalidate();
136	}
137	}
138	}
139	}

OpaqueCommand的方法：ShowOpaqueLayer(显示遮罩层)和HideOpaqueLayer(隐藏遮罩层)

View Row Code

1	using System;
2	using System.Windows.Forms;
3
4	namespace 加载中
5	{
6	class OpaqueCommand
7	{
8	private MyOpaqueLayer.MyOpaqueLayer m_OpaqueLayer = null;//半透明蒙板层
9
10	/// <summary>
11	/// 显示遮罩层
12	/// </summary>
13	/// <param name="control">控件</param>
14	/// <param name="alpha">透明度</param>
15	/// <param name="isShowLoadingImage">是否显示图标</param>
16	public void ShowOpaqueLayer(Control control, int alpha, bool isShowLoadingImage)
17	{
18	try
19	{
20	if (this.m_OpaqueLayer == null)
21	{
22	this.m_OpaqueLayer = new MyOpaqueLayer.MyOpaqueLayer(alpha, isShowLoadingImage);
23	control.Controls.Add(this.m_OpaqueLayer);
24	this.m_OpaqueLayer.Dock = DockStyle.Fill;
25	this.m_OpaqueLayer.BringToFront();
26	}
27	this.m_OpaqueLayer.Enabled = true;
28	this.m_OpaqueLayer.Visible = true;
29	}
30	catch { }
31	}
32
33	/// <summary>
34	/// 隐藏遮罩层
35	/// </summary>
36	public void HideOpaqueLayer()
37	{
38	try
39	{
40	if (this.m_OpaqueLayer != null)
41	{
42	this.m_OpaqueLayer.Visible = false;
43	this.m_OpaqueLayer.Enabled = false;
44	}
45	}
46	catch(Exception ex)
47	{
48	//MessageBox.Show(ex.Message);
49	}
50	}
51	}
52	}

自定义半透明遮罩层源码下载：

files.cnblogs.com/JuneZhang/%E8%87%AA%E5%AE%9A%E4%B9%89%E5%8D%8A%E9%80%8F%E6%98%8E%E9%81%AE%E7%BD%A9%E5%B1%82-%E6%BA%90%E7%A0%81.rar