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YoFi
Asked:2020-01-26 20:26:32 +0000 UTC2020-01-26 20:26:32 +0000 UTC

检查所选文件是否存在

  • 772

如何检查文件是否被选中？

private void BrowseFilesButton_Click(object sender, RoutedEventArgs e)
        {
            var ofd = new OpenFileDialog {Multiselect = true};
            ofd.ShowDialog();
            ViewModel.ChoosenFiles = ofd.FileNames;
            FileBox.Text = $"Selected {ofd.FileNames.Length} scripts";
        }

        private void ExecFilesButton_Click(object sender, RoutedEventArgs e)
        {   
            List<Script> scriptToRun = ViewModel.ChoosenFiles.Select(item => new Script(item)).ToList();

            SetProgressBar(scriptToRun.Count);
            var runner = new Runner(ViewModel.SelectedConnection);
            runner.RunQueries(scriptToRun, UpdateProgressBar());

            MessageBox.Show("ok");
        }
c#

3 个回答

  1. Best Answer

    您应该检查用户如何关闭对话框：使用 OK 或其他方式。

    为此，使用构造

    if (ofd.ShowDialog() == true) ...

    （true需要与 进行比较，因为返回类型是bool?，而不是bool）。

    该值true表示使用确定按钮关闭对话框，在这种情况下文件列表必须是非空的。

    在其他返回值（false或null）的情况下，对话框被另一个按钮关闭（Esc，取消，Alt+F4...）并且没有选择文件。（当前的实现似乎永远不会返回null。）

    • 2 
  2. private void BrowseFilesButton_Click(object sender, RoutedEventArgs e)
{
    using (var ofd = new OpenFileDialog {Multiselect = true})
    {
        System.Windows.Forms.DialogResult result = ofd.ShowDialog();
        if (result != DialogResult.OK || ofd.FileNames.Length == 0)
            return;
        ViewModel.ChoosenFiles = ofd.FileNames;
        FileBox.Text = $"Selected {ofd.FileNames.Length} scripts";
    }
}
    • 1

  3. 我这样做了并且有效：

    private void BrowseFilesButton_Click(object sender, RoutedEventArgs e)
    {
        var ofd = new OpenFileDialog{Multiselect = true};
        ofd.ShowDialog();
        if (ofd.FileNames.Length == 0)
            return;
        ViewModel.ChoosenFiles = ofd.FileNames;
        FileBox.Text = $"Selected {ofd.FileNames.Length} scripts";
    }

private void ExecFilesButton_Click(object sender, RoutedEventArgs e)
    {
        if(ViewModel.ChoosenFiles.Length == 0)
        {
            MessageBox.Show("Choose sql files");
        }
        else
        {
            List<Script> scriptToRun = ViewModel.ChoosenFiles.Select(item => new Script(item)).ToList();

            SetProgressBar(scriptToRun.Count);
            var runner = new Runner(ViewModel.SelectedConnection);
            runner.RunQueries(scriptToRun, UpdateProgressBar());
            MessageBox.Show("ok");
        }
    }
    • 0

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