C#中SaveFileDialog 和OpenFileDialog 的用法

1.OpenFileDialog

 1         private void btnOpen_Click(object sender, EventArgs e)
 2         {
 3             OpenFileDialog ofd = new OpenFileDialog();
 4             ofd.InitialDirectory = @"C:\Users\LWP1398\Desktop"; //设置初始路径
 5             ofd.Filter = "Excel文件(*.xls)|*.xls|Csv文件(*.csv)|*.csv|所有文件(*.*)|*.*"; //设置“另存为文件类型”或“文件类型”框中出现的选择内容
 6             ofd.FilterIndex = 2; //设置默认显示文件类型为Csv文件(*.csv)|*.csv
 7             ofd.Title = "打开文件"; //获取或设置文件对话框标题
 8             ofd.RestoreDirectory = true;
 9             if (ofd.ShowDialog() == DialogResult.OK)
10             {
11                 //FileName：所选文件的全路径  SafeFileName：所选的文件名
12                 txtPath.Text = "FileName:" + ofd.FileName + "\r\n" + "SafeFileName:" + ofd.SafeFileName;
13             }
14         }

2.OpenFileDialog选择多个文件

 1         private void button3_Click(object sender, EventArgs e)
 2         {
 3             OpenFileDialog ofd = new OpenFileDialog();
 4             ofd.InitialDirectory = @"C:\Users\LWP1398\Desktop"; //设置初始路径
 5             ofd.Filter = "Excel文件(*.xls)|*.xls|Csv文件(*.csv)|*.csv|所有文件(*.*)|*.*"; //设置“另存为文件类型”或“文件类型”框中出现的选择内容
 6             ofd.FilterIndex = 2; //设置默认显示文件类型为Csv文件(*.csv)|*.csv
 7             ofd.Title = "打开文件"; //获取或设置文件对话框标题
 8             ofd.RestoreDirectory = true;////设置对话框是否记忆上次打开的目录
 9
10             ofd.Multiselect = true;//设置多选
11             if (ofd.ShowDialog() == DialogResult.OK)
12             {
13                 for (int i = 0; i < ofd.FileNames.Length; i++)
14                 {
15                     txtPath.Text += ofd.FileNames[i] + "\r\n";//输出一个路径回车换行
16                 }
17                 for (int i = 0; i < ofd.FileNames.Length; i++)
18                 {
19                     txtPath.Text += ofd.SafeFileNames[i] + "\r\n";
20                 }
21             }
22         }

3.SaveFileDialog

 1         private void button2_Click(object sender, EventArgs e)
 2         {
 3             SaveFileDialog sfd=new SaveFileDialog();
 4             sfd.Filter = "文本文件(*.txt)|*.txt|所有文件|*.*";//设置文件类型
 5             sfd.FileName = "保存";//设置默认文件名
 6             sfd.DefaultExt = "txt";//设置默认格式（可以不设）
 7             sfd.AddExtension = true;//设置自动在文件名中添加扩展名
 8             if (sfd.ShowDialog()==DialogResult.OK)
 9             {
10                 txtPath.Text = "FileName:" + sfd.FileName + "\r\n" ;
11                 using (StreamWriter sw = new StreamWriter(sfd.FileName))
12                 {
13                     sw.WriteLineAsync("今天是个好天气");
14                 }
15             }
16             MessageBox.Show("ok");
17         }