如何用兩個逗號分隔字符串，，？

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();
                }
            }
        }

這是進行拆分的行：

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

問題是如果我輸入 textBox1 例如 sadsdss,,s,,form1,,,,,,,,f,,dd,,,,,,

然后在突出顯示單詞時，所有有兩個以上逗號的地方都算作空字符串：

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;
        }

異常就行了：

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

System.ArgumentOutOfRangeException: '索引超出范圍。 必須是非負數且小於集合的大小。 參數名稱：startIndex'

因為該短語是空字符串“”

我想要做的是每個地方都有兩個以上的逗號，例如，，即使用戶鍵入 s,,1,,form1,,,,,, 也將其視為字符串作為單詞

所以單詞 s 1 form1 和,,,,,, all 應該算作結果和應該突出顯示的單詞。

Answer 1

如果要刪除空條目，只需借助StringSplitOptions.RemoveEmptyEntries選項即可：

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

另一種可能性是在Linq的幫助下進行查詢，如果您想排除（過濾掉）一些單詞，這可能會有所幫助，例如

using System.Linq;

...

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