c#求高手相助

Question

  private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            pictureBox1.Image = Image.FromFile(Application.StartupPath + "\\" + listBox1.SelectedItem.ToString());
        }
还有你调试中看一下 string path = this.openFileDialog1.FileName;这里的path与
=Image.FromFile(this.path +"\\"+listBox1.SelectedItem.ToString())中的path是不是一个变量　，
前面已包含路径与文件名，后者应该是路径，所以后者要取出前者的路径才是。

Answer 1

  public string filepath;
        public Form1()
        {
            InitializeComponent();
        }        private void button1_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "*.gif|*.jpg";
            if (this.openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                string  path = this.openFileDialog1.FileName;
                 filepath=Path.GetDirectoryName(path); 
                FileInfo f = new FileInfo(path);
               //// AddFile(f.FullName);
               // string strTmp = Convert.ToString(num);
               // for (int i = 1; i <= 5 - strTmp.Length; i++)
               //     strTmp += ' ';
               // strTmp += "--" + f.Name;
                this.listBox1.Items.Add(f.Name);
                //   pictureBox1.Image = listBox1.DataSource;
            }
        }        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            pictureBox1.Image = Image.FromFile(filepath + "\\" + listBox1.SelectedItem.ToString());
        }

Answer 2

string path = this.openFileDialog1.FileName;
这里把Path定义在外面
private path;然后这行写成 Path.GetDirectoryName( this.openFileDialog1.FileName);