如何修复'System.IO.IOException：'进程无法访问文件'

Question

以下代码给我该错误“ System.IO.IOException：'该进程无法访问文件'C:\Users\user1\Desktop\exampleText.txt' because it is being used by another process" 这是代码：

Regex regex = new Regex(regexBox.Text, RegexOptions.Singleline);
            foreach(string file in fileNames)
            {

                var currentFile = File.Open(file, FileMode.Open, FileAccess.Read);
                string[] texts = File.ReadAllLines(currentFile.Name);
                currentFile.Close();

                var match = regex.Matches(texts.ToString())
                   .Cast<Match>()
                   .Select(m => m.Value)
                   .ToArray(); ;
                textBox1.Lines = match;
                Array.Copy(match, myTexts,match.Length);
              }

知道为什么我会收到该错误吗？