在富文本框顶部插入 [英] Inserting at top of richtextbox

问题描述

这段代码有什么问题?试图让我的文本插入文本框的开头而不是底部.

<前>私有无效execute_Click(对象发送者，EventArgs e){startFinshBox.Text = "开始时间:" + printTime()+"";startFinshBox.Text.Insert(0,printTime()+": 检索结果...\n");}

但它不会将第二行插入到 rtb 中.我也尝试过 startFinishBox.SelectionStart = 0 ，但没有任何区别.我还缺什么吗?

谢谢，心理医生

解决方案

startFinshBox.Text 是一个字符串，它是 C# 中的不可变类型.string.Insert() 将返回修改后的字符串作为结果，但您的代码将丢弃它.要使其工作，您必须将代码更改为:

private void execute_Click(object sender, EventArgs e){startFinshBox.Text = "开始时间:" + printTime()+"";startFinshBox.Text = startFinshBox.Text.Insert(0,printTime()+": 检索结果...\n");}

Whats wrong with this code? Trying to get my text to insert at the beginning of the textbox rather than at the bottom.

private void execute_Click(object sender, EventArgs e){
  startFinshBox.Text = "Start Time: " + printTime()+"";
  startFinshBox.Text.Insert(0,printTime()+": Retrieving Results...\n");
}

But it will not insert the second line into the rtb. I have tried with startFinishBox.SelectionStart = 0 as well, and it made no difference. Am I missing something else?

Thanks, Psy

解决方案

startFinshBox.Text is a string, which is an immutable type in C#. string.Insert() will return the modified string as a result, but it your code you discard it. To make it work, you have to change the code to:

private void execute_Click(object sender, EventArgs e){
  startFinshBox.Text = "Start Time: " + printTime()+"";
  startFinshBox.Text = startFinshBox.Text.Insert(0,printTime()+": Retrieving Results...\n");
}

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