在多行文本框中编辑文本 [英] Edit text in multiline textbox

问题描述

我有字母，符号和数字。每个都有自己的标签。我在每个标签上都有一个点击事件，它将标签中的任何内容添加到多行文本框中。



问题是无论插入符号在哪里，当我编辑时通过删除某些内容，然后单击标签将新项目添加到文本框中，它总是将其放在最后一行的末尾而不是插入符号的位置。



我知道这是因为我告诉它通过这样的点击事件：

I have letters, symbols and numbers. Each one is in its own label. I have a click event on each label which adds whatever is in the label to a multi line textbox.

The problem is no matter where the caret is, when I edit the text by deleting something, and then click a label to add a new item to the textbox, it always puts it at the end of the last line rather than where the caret is.

I know this is because I'm telling it to through the click event like this:

private void lblCbore_MouseClick(object sender, MouseEventArgs e)
        {
            txtFCF.Text += lblCbore.Text;
        }

我如何告诉它将我点击的项目放在插入符号的位置，而不是在最后最后一行？



我尝试了什么：



所有我已经完成的是使用多行文本框。我没想到它不能作为单行文本框工作。我搜索了谷歌，并在这里寻求答案。

How can I tell it to place the item I click where the caret is, instead of at the end of the last line?

What I have tried:

All I've done is use the multiline textbox. I didn't expect it to not work as a single line textbox. I've searched google, and on here for an answer.

推荐答案

这很简单：文本框中的Caret位置由SelectionStart属性给出：

It's pretty simple: the Caret position in a textbox is given by the SelectionStart property:

private void MyButton_Click(object sender, EventArgs e)
    {
    int pos = myTextBox.SelectionStart;
    string str = "The new text. ";
    myTextBox.Text = myTextBox.Text.Insert(pos, str);
    myTextBox.SelectionStart = pos + str.Length;
    }

txtFCF.Text += lblCbore.Text;

这不是你插入的方式;你明确追加。



考虑一下：



如何找到光标的位置在文本框中？ C＃ - Stack Overflow [ ^ ]

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