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我有下面的应用程序。为了方便读者在这里测试，我稍微修改了一下。我注意到，当我使用扩展名设置文件名时，例如 test.txt，对话框会删除 txt 扩展名。但是我希望用户能够指定扩展名，更重要的是我希望能够设置扩展名。我认为破解它的一种方法是根据我拥有的扩展名修改过滤器。这是唯一的方法吗？

我正在使用 VS 2010 Express。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Globalization;
using System.IO;
using System.Windows;
namespace SpeedDating
{
    partial class Program
    {
         [STAThread]
        static void Main(string[] args)
        {
            Form form = new Form();
            form.WindowState = FormWindowState.Minimized;
            form.ShowInTaskbar = false;
            form.TopMost = true;
            form.Show();

            string filename = "test.txt";
            string ext = filename.Substring(filename.LastIndexOf('.'));
            SaveFileDialog dialog = new SaveFileDialog();
            dialog.Title = "SpeedDating App";
            dialog.RestoreDirectory = true;
            dialog.CheckFileExists = false;
            dialog.CheckPathExists = false;
            dialog.SupportMultiDottedExtensions = true;
            dialog.AddExtension = false;
            dialog.Filter = "All files (*.*)|*.*";
            dialog.FileName = DateTime.Now.ToString("yyyyMMdd") + ext;

            DialogResult result = dialog.ShowDialog();
            if (result == DialogResult.OK && dialog.FileName != "")
            {
                try
                {
                    FileStream outfs = File.Create(dialog.FileName);
                    FileStream infs = File.Open(filename, FileMode.Open);
                    infs.CopyTo(outfs);
                    infs.Close();
                    outfs.Close();

                    MessageBox.Show(form, "Copied file.");
                }
                catch (NotSupportedException ex)
                {
                    MessageBox.Show(form, "Probably removed the original file.");
                }
            }
            else if (result != DialogResult.Cancel)
            {
                MessageBox.Show(form, "No path found to write to.");
            }

            form.Close();
        }
    }
}
4

1 回答 1

4

更重要的是我希望能够设置扩展

您可以设置.DefaultExt()、.AddExtension()、 .Filter( )和.FilterIndex()属性：

        string filename = "test.xyz";

        SaveFileDialog dialog = new SaveFileDialog();
        dialog.Title = "SpeedDating App";
        dialog.RestoreDirectory = true;
        dialog.CheckFileExists = false;
        dialog.CheckPathExists = false;
        dialog.SupportMultiDottedExtensions = true;
        dialog.Filter = "All files (*.*)|*.*";

        dialog.DefaultExt = System.IO.Path.GetExtension(filename);
        if (dialog.DefaultExt.Length > 0)
        {
            dialog.AddExtension = true;
            dialog.Filter = dialog.DefaultExt + " files (*." + dialog.DefaultExt + ")|*." + dialog.DefaultExt + "|" + dialog.Filter;
            dialog.FilterIndex = 0;
        }

        dialog.FileName = DateTime.Now.ToString("yyyyMMdd");

        DialogResult result = dialog.ShowDialog();
        if (result == DialogResult.OK && dialog.FileName != "")
        {
            Console.WriteLine(dialog.FileName);
        }

*请注意，如果在文件资源管理器中关闭显示“文件扩展名”的选项，则对话框也将隐藏扩展名......但上述设置会将设置的扩展名添加到对话框返回的 .FileName() 值.

于 2013-05-31T15:45:18.020 回答