每当我设置了 RichTextBox.Enabled 属性设置为false，它的背景色自动设置为灰色，因为它被设置为系统颜色的颜色，这是在设置控制面板。我怎样才能改变其颜色为黑色，即使我将它设置为禁用？

Whenever I set the RichTextBox.Enabled property to false, its background color is automatically set to gray as it is set to the color in system color which is set in the control panel. How can I change its color to black even if I set it to disabled?

推荐答案

请参阅：http://stackoverflow.com/questions/276179/how-to-change-the-font-color-of-a-disabled-textbox

richTextBox.TabStop = false;
richTextBox.ReadOnly = true;
richTextBox.BackColor = Color.DimGray;
richTextBox.Cursor = Cursors.Arrow;
richTextBox.Enter += richTextBox_Enter;

private void richTextBox_Enter(object sender, EventArgs e)
{
    // you need to set the focus somewhere else. Eg a label.
    SomeOtherControl.Focus();
}

或连接扩展方法（我意识到你没有把它只读，因为Enter事件捕获任何输入）：

or as en extension method (I realized you don't have to put it in readonly since the Enter event catches any input):

public static class MyExtensions
{
    public static void Disable( this Control control, Control focusTarget )
    {
        control.TabStop = false;
        control.BackColor = Color.DimGray;
        control.Cursor = Cursors.Arrow;
        control.Enter += delegate { focusTarget.Focus(); };
    }
}