如何更新richtextbox的现有文本而不覆盖现有文本C＃ [英] How to I update the existing text of a richtextbox without overwriting the existing text C#

问题描述

我目前正在Visual Studio 2015中设计和构建一个Windows窗体应用程序，该应用程序结合使用richtextbox来跟踪用户状态，就像已经使用/脱离的功能一样，只是一般的应用程序，但是当我尝试通过以下方式以编程方式将文本添加到文本框：



示例：

I am currently designing and constructing a windows forms application in visual studio 2015 that incorporates the use of a richtextbox to track the users status as in what functions have been engaged/disengaged, just general applications like that however when ever i try to add text to the textbox programmatically via :

Example:

richTextBox1.Text = Environment.NewLine + "";

由于我的应用程序的性质，我要求在整个应用程序中从多个来源（按钮）更新文本而不删除现有内容

按钮1：

due to the nature of my application purpose i require the text to be updated from multiple sources (buttons) throughout the application without removing existing content
Button 1 :

<pre lang="c#"> 
IP = flatTextBox1.Text;
richTextBox1.Text = "Action";

按钮2：

Button 2:

<pre lang="c#">
richTextBox1.Text = Environment.NewLine + "Action";

按钮3：

Button 3:

<pre lang="c#">
richTextBox1.Text = Environment.NewLine + "Action";

任何帮助将不胜感激



我的尝试：



按钮1：

any help will be appreciated

What I have tried:

Button 1 :

richTextBox1.Text = Environment.NewLine + "yo";

按钮2：

Button 2 :

flatTexrichTextBox1tBox2.Text = Environment.NewLine + "Your Target IP Has Been Set To : " + IP;

但它会一直覆盖它

but it keeps overwriting it

推荐答案

它是覆盖它，因为你告诉它！

最简单的方法是使用

It's overwriting it because you are telling it to!
The simplest way is to use

richTextBox1.Text += Environment.NewLine + "Action";

但是这不是一个好的解决方案 - 每次都会创建一个新字符串，因为字符串是不可变的（无法更改）。

更好的解决方案是使用StringBuilder，例如

but that is not a good solution - a new string will be created each time because strings are immutable (cannot be changed).
A better solution would be to use a StringBuilder e.g.

StringBuilder sb = new StringBuilder(richTextBox1.Text);
sb.Append(Environment.NewLine);
sb.Append("Action");
richTextBox1.Text = sb.ToString();

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