WinForm:简单实现RichTextBox加载背景图

为RichTextBox加载背景图，尝试过不少方法，总结后，以下方法较为完善，且简单实现。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
namespace RichTextBoxBackPicture
{
public partial class UserRichTexBox : UserControl
{
public UserRichTexBox()
{
//为用户控制启用双缓冲等控件样式，否则RichTextBox输入时，会有残影
this.SetStyle(ControlStyles.AllPaintingInWmPaint |
ControlStyles.UserPaint |
ControlStyles.OptimizedDoubleBuffer, true);
InitializeComponent();
}
/// <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.alphaRichTextBox1 = new RichTextBoxBackPicture.AlphaRichTextBox();
this.SuspendLayout();
//
// alphaRichTextBox1
//
this.alphaRichTextBox1.Dock = System.Windows.Forms.DockStyle.Fill;
this.alphaRichTextBox1.Location = new System.Drawing.Point(0, 0);
this.alphaRichTextBox1.Name = "alphaRichTextBox1";
this.alphaRichTextBox1.Size = new System.Drawing.Size(150, 150);
this.alphaRichTextBox1.TabIndex = 0;
this.alphaRichTextBox1.Text = "";
//
// UserRichTexBox
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.Controls.Add(this.alphaRichTextBox1);
this.Name = "UserRichTexBox";
this.ResumeLayout(false);
}
#endregion
private AlphaRichTextBox alphaRichTextBox1;
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
//为测试效果，特加载背景图片
this.BackgroundImageLayout = ImageLayout.Stretch;
this.BackgroundImage = Image.FromFile(@"G:WindowsWebWallpaperCharactersimg23.jpg");
}
}
public class AlphaRichTextBox:RichTextBox
{
//关键点：支持透明背景
protected override CreateParams CreateParams
{
get
{
CreateParams cp= base.CreateParams;
cp.ExStyle
|= 0x20;
return cp;
}
}
}
}

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