文本框只读时如何更改文本的前景色 [英] How to change forecolor of text when textbox is readonly

问题描述

美好的一天



我自己制作了文本框，我想更改文本框内文本的前景色。



我编写了以下代码，但它没有将文本框内文本的forecolor更改为灰色。

Good day

I made my textboxes reaadonly and I want to change the forecolor of the text inside of the textboxes.

I have written the following code, but it is not changing the forecolor of the text inside of the textbox to grey.

txtVersion.ForeColor = Color.Gray;

如果文本框是只读的，我该如何更改文本的前景色？ ？



Thanx

How can I change the forecolor of the text, when the textbox is made readonly?

Thanx

推荐答案

只读系统的ForeColor属性有些奇怪.Windows .Form.TextBox我还没有看到记录，虽然我看起来不是很努力。



我注意到前景颜色改变只有在生效之后才生效背景颜色已更改一次。之后，任何后续的前景变化都会立即发生。



我的小测试应用程序：

There is something odd about the ForeColor property of a read only System.Windows.Form.TextBox which I haven't seen documented, although I haven't looked very hard.

I've noticed that a foreground colour change only takes effect after the background colour has been changed once. After that any subsequent foreground changes take place immediately.

My little test app:

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

// Requires a form with 2 text boxes and 2 buttons

public partial class Form1 : Form {
  private readonly Color[] rainbow = new Color[] {
    Color.Red,
    Color.Orange,
    Color.Yellow,
    Color.Green,
    Color.Blue,
    Color.Indigo,
    Color.Violet
  };

  private Int32 foreIdx, backIdx;

  public Form1() {
    InitializeComponent();
    backIdx = rainbow.Length - 1;
    NormalTextBox.Text = "Standard text box";
    ReadOnlyTextBox.Text = "Read only text box";
  }

  private void ForeColBtn_Click(object sender, EventArgs e) {
    NormalTextBox.ForeColor = rainbow[foreIdx];
    ReadOnlyTextBox.ForeColor = rainbow[foreIdx];
    foreIdx = ++foreIdx % rainbow.Length;
  }

  private void BackColBtn_Click(object sender, EventArgs e) {
    NormalTextBox.BackColor = rainbow[backIdx];
    ReadOnlyTextBox.BackColor = rainbow[backIdx];
    backIdx = ++backIdx % rainbow.Length;
  }
}

玩得开心，



Alan。

Have fun,

Alan.

你不能，没有大量工作。



当你将文本框设置为只读时，前景和背景颜色被覆盖并被忽略，以支持系统禁用的颜色 - BAAAAD改变它们的想法。



最简单的方法是是创建自己的控件，从TextBox派生并自己处理ReadOnly - 通过KeyPress事件禁用文本输入并自己设置颜色。

You can't, without a lot of work.

When you set the textbox to readonly, the foreground and background colours are overridden and ignored in favour of the system disabled colors - and it is a BAAAAD idea to change them.

The easiest way to do it would be to create your own control, derived from TextBox and handle ReadOnly yourself - disable text entry via the KeyPress event and set the color yourself.

我所做的是，而不是使用Readonly，我使用Enabled。

What I have done is, instead of using Readonly , I use Enabled.

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