如何用两个逗号 , 分割字符串？

Question

void lvnf_SelectedIndexChanged(object sender, EventArgs e)
        {
            results = new List<int>();
            richTextBox1.Text = File.ReadAllText(listViewCostumControl1.lvnf.Items[listViewCostumControl1.lvnf.SelectedIndices[0]].Text);
            FileInfo fi = new FileInfo(listViewCostumControl1.lvnf.Items[listViewCostumControl1.lvnf.SelectedIndices[0]].Text);
            lblfilesizeselected.Text = ExtensionMethods.ToFileSize(fi.Length);
            lblfilesizeselected.Visible = true;
            filePath = Path.GetDirectoryName(fi.FullName);
            string words = textBox1.Text;
            string[] splittedwords = words.Split(new string[] { ",," }, StringSplitOptions.None);
            foreach (string myword in splittedwords)
            {
                HighlightPhrase(richTextBox1, myword, Color.Yellow);
                lblviewerselectedfile.Text = results.Count.ToString();
                lblviewerselectedfile.Visible = true;
                if (results.Count > 0)
                {
                    numericUpDown1.Maximum = results.Count;
                    numericUpDown1.Enabled = true;
                    richTextBox1.SelectionStart = results[(int)numericUpDown1.Value - 1];
                    richTextBox1.ScrollToCaret();
                }
            }
        }

这是分割线：

string[] splittedwords = words.Split(new string[] { ",," }, StringSplitOptions.None);

问题是如果我输入 textBox1 例如 sadsdss,s,form1,f,dd,

然后所有超过两个逗号的地方在突出显示单词时都算作空字符串:

void HighlightPhrase(RichTextBox box, string phrase, Color color)
        {
            int pos = box.SelectionStart;
            string s = box.Text;
            for (int ix = 0; ;)
            {
                int jx = s.IndexOf(phrase, ix, StringComparison.CurrentCultureIgnoreCase);
                if (jx < 0)
                {
                    break;
                }
                else
                {
                    box.SelectionStart = jx;
                    box.SelectionLength = phrase.Length;
                    box.SelectionColor = color;
                    ix = jx + 1;
                    results.Add(jx);
                }
            }
            box.SelectionStart = pos;
            box.SelectionLength = 0;
        }

异常在线:

int jx = s.IndexOf(phrase, ix, StringComparison.CurrentCultureIgnoreCase);

System.ArgumentOutOfRangeException: '索引超出范围。必须为非负数且小于集合的大小。参数名称：startIndex'

因为词组是空串""

我想做的是，每个地方都有两个以上的逗号，如 , 即使用户输入 s,1,form1,

所以单词s 1 form1 and , 都应该算作结果和应该突出显示的单词。

Answer 1

如果您想删除空条目，只需借助 StringSplitOptions.RemoveEmptyEntries 选项即可：

string[] splittedwords = words.Split(
  new string[] { ",," }, 
  StringSplitOptions.RemoveEmptyEntries);

另一种可能性是在 Linq 的帮助下 query，如果您想 exclude，这会很有帮助（过滤掉）一些词，例如

using System.Linq;

...

string[] splittedwords = words
  .Split(new string[] { ",," }, StringSplitOptions.None)
  .Where(item => !string.IsNullOrWhiteSpace(item))
  .ToArray();

如何用两个逗号 , 分割字符串？

How can I split strings by two commas ,,?

c#

winforms