c#怎么设置richtextbox透明

Posted 2023-04-27

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace LL

public class UserRichTextBox : UserControl

public UserRichTextBox()

//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 LL.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 = "";
//
// UserRichTextBox
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.Controls.Add(this.alphaRichTextBox1);
this.Name = "UserRichTextBox";

this.ResumeLayout(false);


#endregion

public 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.None;
//this.BackgroundImage = Image.FromFile(@"E:\\Visual Studio 2010\\Projects\\LL\\LL\\Resources\\title.png");



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;





richtextbox是不能设置透明的，我这有个重写过的透明richtextbox，供你参考 参考技术A .opacity = 0

c#怎么让richtextbox不可编辑？

如果只是把它的enabled属性设置为fasle的，颜色会变的，而且也设置背景颜色backcolor为白色也没用.....

请问怎样才能让richtextbox不可编辑？而且看起来和平常的richtextbox一样？

参考技术A 不是把enabled属性设置为fasle，而是把readonly属性设为true，并且把BackColor这是为White。本回答被提问者采纳 参考技术B 把readonly属性设为true,把BackColor这是为White。 参考技术C xxx.ReadOnly = false;
xxx.BackColor = System.Drawing.Color.White; 参考技术D 把readonly属性设为true 第5个回答  2019-05-01 很多人说直接将readonly属性设为true，这样的话richtextbox无法添加图片；
我这里介绍一个方法吧，叫做焦点转移，当richtextbox遇到鼠标点击事件，则将其焦点转移到其他控件上面，这样richtextbox就无法进行编辑了，代码如下：
'rtb_dhk富文本控件鼠标按下事件
Private Sub rtb_dhk_MouseDown(sender As Object, e As MouseEventArgs) Handles rtb_dhk.MouseDown
btn_send.Focus() '让btn_send控件得到焦点，这样就让rtb_dhk富文本控件失去焦点
End Sub
'rtb_dhk富文本控件鼠标点击事件
Private Sub rtb_dhk_MouseClick(sender As Object, e As MouseEventArgs) Handles rtb_dhk.MouseClick
btn_send.Focus() ' 让btn_send控件得到焦点，这样就让rtb_dhk富文本控件失去焦点
End Sub