如何让一个方法使用其他方法中的变量？

            void openFileDialogFileOk(object sender, System.ComponentModel.CancelEventArgs e)
            {
                string fullPathname = openFileDialog.FileName;
                FileInfo src = new FileInfo(fullPathname);
                fileName.Text = src.Name;

                source.Text = "";
                TextReader reader = src.OpenText();
                string line = reader.ReadLine();
                int count = 0;
                while (line != null)
                {
                    line = reader.ReadLine();
                    count += 1;
                }
                string[] quest;
                quest = new string[count];
                int yes = 1;
                TextReader second = src.OpenText();
                while (yes != count)
                {
                    quest[yes] = second.ReadLine();
                    yes += 1;
                }
                Random ran = new Random();
                source.Text += quest[ran.Next(1, count)];
                reader.Close();
            }

            void bottom1_Click(object sender, RoutedEventArgs e) 
 
            {
                source.Text += quest[ran.Next(1, count)];
            }

[解决办法]
将
string[] quest;
int count = 0;
Random ran = new Random();
放到方法外面
[解决办法]
string[] quest;
int count = 0;
private void ReadText()
{
string path = @"E:\1.txt";
FileInfo fileInfo = new FileInfo(path);
TextReader reader = fileInfo.OpenText();
List<string> txtList = new List<string>();

string text = reader.ReadLine();
while (!string.IsNullOrEmpty(text))
{
txtList.Add(text);
text = reader.ReadLine();
}
reader.Close();
count = txtList.Count;
quest = txtList.ToArray();

}

private void button1_Click(object sender, EventArgs e)
{
MessageBox.Show(GetRandomLine());
}

private string GetRandomLine()
{
Random ran = new Random();
return quest[ran.Next(0, count - 1)];
}
感觉这样实现会好一点