禁用 RichTextBox 或 TextBox 中的选择突出显示

问题描述：

如何在我的 Windows 窗体应用程序中禁用 RichTexBox 或 TextBox 的选择突出显示，如图所示.

How can I disable the selection highlight of RichTexBox or TextBox in my Windows Forms Application as shown in the image.

我需要将选择高亮颜色从 Blue 更改为 White，因为我需要隐藏 TextBox 或 RichTextBox 一直.我尝试使用 RichTextBox.HideSelection = true，但它没有像我预期的那样工作.

I need to change selection highlight color from Blue to White, because I need to hide selection in TextBox or RichTextBox all the time. I tried to use RichTextBox.HideSelection = true, but it doesn't not work as I expect.

答

您可以处理 WM_SETFOCUS RichTextBox 的消息并将其替换为 WM_KILLFOCUS.

You can handle WM_SETFOCUS message of RichTextBox and replace it with WM_KILLFOCUS.

在下面的代码中，我创建了一个具有 Selectable 属性的 ExRichTextBox 类:

In the following code, I've created a ExRichTextBox class having Selectable property:

Selectable:启用或禁用选择突出显示.如果您将 Selectable 设置为 false，则选择突出显示将被禁用.默认情况下已启用.

Selectable: Enables or disables selection highlight. If you set Selectable to false then the selection highlight will be disabled. It's enabled by default.

备注:它不会使控件只读，如果您需要将其设为只读，您还应该将 ReadOnly 属性设置为 true 及其BackColor 到 White.

Remarks: It doesn't make the control read-only and if you need to make it read-only, you should also set ReadOnly property to true and its BackColor to White.

public class ExRichTextBox : RichTextBox
{
    public ExRichTextBox()
    {
        Selectable = true;
    }
    const int WM_SETFOCUS = 0x0007;
    const int WM_KILLFOCUS = 0x0008;

    ///<summary>
    /// Enables or disables selection highlight. 
    /// If you set `Selectable` to `false` then the selection highlight
    /// will be disabled. 
    /// It's enabled by default.
    ///</summary>
    [DefaultValue(true)]
    public bool Selectable { get; set; }
    protected override void WndProc(ref Message m)
    {
        if (m.Msg == WM_SETFOCUS && !Selectable)
            m.Msg = WM_KILLFOCUS;

        base.WndProc(ref m);
    }
}

您可以对 TextBox 控件执行相同操作.

You can do the same for TextBox control.

禁用 RichTextBox 或 TextBox 中的选择突出显示

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