大家帮忙看看这段代码的问题出在哪:?

Question

下面这段代码一执行到红字部分,就说filePath这个路径正在被使用，不能引用，请问是什么问题应该怎么解决？
if (this.fileMode == "new")
            {
                SaveFileDialog sfd = new SaveFileDialog();
                sfd.DefaultExt = ".txt";
                
                if (sfd.ShowDialog() == DialogResult.OK)
                {
                    if (sfd.FileName != "")
                    {
                        if (File.Exists(sfd.FileName))
                        {
                            if (MessageBox.Show(this, "This Filename has exist,do you want to continue?", "Same Name", MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation) == DialogResult.Yes)
                            {
                                File.Create(sfd.FileName);
                                filePath = sfd.FileName;
                            }
                            else { return; }
                        }
                        else
                        {
                            File.Create(sfd.FileName);
                            filePath = sfd.FileName;
                        }
                    }
                    else
                    {
                        MessageBox.Show(this, "Please input filename!", "new file", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                        return;
                    }
                }
            }
            try
            {
                StreamWriter sw = new StreamWriter(filePath);                if (sw != null)
                {
                    sw.Write(this.textBox1.Text);
                }
                sw.Close();
            }
            catch (Exception ex)
            { MessageBox.Show(ex.Message); }            this.Close();

Answer 1

FileStream fs = new FileStream(filePath,FileAcces.Open.FileMode.Read)   
StreamWriter sw = new StreamWriter(fs); 
这样改

Answer 2

你在这个文件上有对象没有Close(),所以一直被独占

Answer 3

你前面确实在用啊
解决1：
注释掉两行File.Create(sfd.FileName); 
后面的StreamWriter会自己创建，你这里创建多余！
解决2：
...