C# 如何从一个有空格的字符串（文本框）中获取插入符号位置的当前单词并按ENTER键？

如何从包含“”和“\r\n”作为单词分隔符的文本框中获取光标位置的当前单词？

类似的操作应该可以：

var currentWord = textBox.Text.Substring(textBox.SelectionStart, textBox.Text.IndexOf(" ", textBox.SelectionStart));

---

我使用此选项选择一个单词：

    private void selectWord()
    {
        int cursorPosition = textBox1.SelectionStart;
        int nextSpace = textBox1.Text.IndexOf(' ', cursorPosition);
        int selectionStart = 0;
        string trimmedString = string.Empty;
        if (nextSpace != -1)
        {
            trimmedString = textBox1.Text.Substring(0, nextSpace);
        }
        else
        {
            trimmedString = textBox1.Text;
        }


        if (trimmedString.LastIndexOf(' ') != -1)
        {
            selectionStart = 1 + trimmedString.LastIndexOf(' ');
            trimmedString = trimmedString.Substring(1 + trimmedString.LastIndexOf(' '));
        }

        textBox1.SelectionStart = selectionStart;
        textBox1.SelectionLength = trimmedString.Length;
    }

要获取所选单词，请执行以下操作：

textBox1.SelectedText

---

我现在有这个问题，下面是我处理这个问题的方法。

TxtLineCodes

是

RichTextBox

控件，请查看我在代码中的注释

private void CheckCurrentWord()
{
    // current caret position
    var currentposition = TxtLineCodes.SelectionStart;
    // get line number
    var linenumber = TxtLineCodes.GetLineFromCharIndex(currentposition);
    // get the first character index of the line
    var firstlineindex = currentposition;
    if (linenumber == 0)
    {
        firstlineindex = 0;
    }
    else
    {
        while (TxtLineCodes.GetLineFromCharIndex(firstlineindex) == linenumber)
        {
            firstlineindex--;
        }
        //fix the last iteration
        firstlineindex += 1;
    }

    // if caret is not in the end of the word discover it
    var lastcaretwordindex = currentposition;
    if (lastcaretwordindex < TxtLineCodes.Text.Length)
        while (lastcaretwordindex < TxtLineCodes.Text.Length && TxtLineCodes.Text.Substring(lastcaretwordindex, 1) != " ")
        {
            lastcaretwordindex += 1;
        }

    // get the text of the line (until the cursor position)
    var linetext = TxtLineCodes.Text.Substring(firstlineindex, lastcaretwordindex - firstlineindex);
    // split all the words in current line
    string[] words = linetext.Split(' ');
    // the last word must be the current word
   System.Diagnostics.Debug.WriteLine("current word: " + words[words.Length - 1]);
    // and you can also get the substring indexes of the current word
    var currentwordbysubstring = TxtLineCodes.Text.Substring(lastcaretwordindex - words[words.Length - 1].Length, words[words.Length - 1].Length);

    var startindex = lastcaretwordindex - words[words.Length - 1].Length;
    var lastindex = startindex + words[words.Length - 1].Length-1;
    System.Diagnostics.Debug.WriteLine("current word: " + currentwordbysubstring + " and its in index (" + startindex + "," + lastindex + ")");
}

private void CheckCurrentWord（）
{
//当前插入符号位置
var currentposition=TxtLineCodes.SelectionStart；
//获取行号
var linenumber=TxtLineCodes.GetLineFromCharIndex（当前位置）；
//获取行的第一个字符索引
var firstlineindex=当前位置；
如果（行号==0）
{
firstlineindex=0；
}
其他的
{
while（TxtLineCodes.GetLineFromCharIndex（firstlineindex）=行号）
{
一线索引--；
}
//修复最后一次迭代
firstlineindex+=1；
}
//如果插入符号不在单词的末尾，请发现它
var lastcaretwordindex=当前位置；
if（lastCareTowerIndex