在c#中，如何在列表视图中显示特定的搜索段落号和docx文件名，而不重复相同的文件名

我正在创建一个应用程序，其中用户在docx文件中搜索单词，并获得包含该单词的段落编号。几乎我的应用程序工作很好，但我所面临的问题是，我得到重复的文件名，并在新的列表视图行获得每个段落。让我们看一下图片，以便更好地理解。的形象。我只是想搜索的文件名和所有段落在一行列表视图分开与'，'逗号。让我们看看欲望图像。参见下面我尝试的代码

private void button2_Click(object sender, EventArgs e)
    {
        this.listView1.Items.Clear();
        try
        {
            foreach (var filePath in Search(this.textBox1.Text, this.textBox2.Text, this.checkBox1.Checked, this.checkBox2.Checked, this.radioButton2.Checked))
            {
                var file = new FileInfo(filePath);
                this.listView1.Items.Add(new ListViewItem(new string[] { file.Name, string.Format("{0:0.0}", file.Length / 1024d), file.FullName, toDisplay }));
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(this, string.Format("Exception details:'n{0}", ex), string.Format("Exception '{0}' occurred.", ex.GetType()), MessageBoxButtons.OK, MessageBoxIcon.Error);
        }
    }
private static IEnumerable<string> Search(string directory, string searchString, bool searchSubdirectories, bool caseSensitive, bool useRegex)
    {
        /*
         * Below is the list where we insert all paragraph of docx file.
         */
        var paragph = new List<string>();
        /*
         * Below I am using foreach loop by using this I get all docx files from a selected directory.
         */
        foreach (var filePath in Directory.GetFiles(directory, "*.docx", searchSubdirectories ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly))
        {
            string docxText;
            int counter = 0;
            using (var stream = File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                docxText = new DocxToStringConverter(stream).Convert();
            string[] lines = docxText.Split(new string[] { Environment.NewLine },StringSplitOptions.RemoveEmptyEntries);
            foreach (string line in lines)
            {
                if (line.IndexOf(searchString, StringComparison.OrdinalIgnoreCase) >= 0)
                {
                    //MessageBox.Show((counter + 1).ToString() + ": " + line);
                    paragph.Add((counter + 1).ToString());
                    arrparagh = paragph.ToArray();
                    toDisplay = string.Join(",", arrparagh);
                    //MessageBox.Show(toDisplay);
                    yield return filePath;
                }
                counter++;
            }
        }
    }

paragph.Clear();
foreach (string line in lines)
    {
        if (line.IndexOf(searchString, StringComparison.OrdinalIgnoreCase) >= 0)
        {
            //MessageBox.Show((counter + 1).ToString() + ": " + line);
            paragph.Add((counter + 1).ToString());
            arrparagh = paragph.ToArray();
            toDisplay = string.Join(",", arrparagh);
            //MessageBox.Show(toDisplay);
        }
        counter++;
    }
    yield return filePath;