如何在 LINQPad 中显示 FolderBrowserDialog？

Question

I want to browse for a folder in a LINQPad script so I tried using FolderBrowserDialog. It didn't work.

Here is a snippet showing what I'm doing?

string path = "";
var browser = new FolderBrowserDialog { ShowNewFolderButton = false };
if (browser.ShowDialog() == DialogResult.OK)
{
    path = browser.SelectedPath;
}

This runs and hangs on the line with ShowDialog() with the yellow execution pointer against that line, but the folder browser dialog isn't visible.

I know that there is an overload for ShowDialog() that takes an IWin32Window owner argument and thought that might be the solution, but haven't yet figured out how to get an IWin32Window for the main LINQPad window. I hoped the Util class might provide a way but unless I'm missing it, it doesn't seem to.

Anyone have advice on getting around this problem?

Answer 1

Setting the Run each query in its own process option to true is the cause of the problem. Setting that option back to the default false allows the code described above to run as expected.

However, making this change disables the built-in debugging. Furthermore the behaviour is still slightly problematic.

On first running the script the dialog is displayed and the script runs to completion after Ok or Cancel is selected. However, on running the script a second time it hangs as described in the question. After cancelling the execution and running it again the dialog displays but on the time after that it hangs again, and so on.

It was pointed out that setting the Always use fresh application domains option may resolve this and it does, allowing the dialog to display on every execution of the script.

Answer 2

Not solution, but an alternative, the FilePicker controle (part of new LinqPad Input Controls).

you can write:

new FilePicker().Dump().TextInput += (x, e) => ((FilePicker)x).Text.Dump();

or:

var picker = new FilePicker();
picker.TextInput += (x, e) => {
    var fileName = picker.Text;
    //action with the file...
};

full example:

void Main()
{
    new FilePicker().Dump().TextInput += (x, e) => procces(((FilePicker)x).Text);
}

void procces(string file)
{
    file.Dump("chosen file...");
    //...
}

Answer 3

I just came across this problem with LINQPad 5. I needed a folder picker similar to the file picker. Your solution worked without me having to modify LINQPad5 settings. The problem was the dialog was staying in the background. So here's how I got your snippet to work with that dialog in focus. Instead of using the FolderBrowseDialog.ShowDialog() I used the overload that passes in a windows form. I created a new form with description and window position then passed that to ShowDialog. That allowed me to set the description and window positioning.

string path = "";
using ( var browser = new System.Windows.Forms.FolderBrowserDialog { ShowNewFolderButton = false })
{
    browser.Description = "Select Folder For Foo Processing";
    var form = new System.Windows.Forms.Form(){TopMost = true, TopLevel = true};
    var result = browser.ShowDialog(form); 
    if (result == System.Windows.Forms.DialogResult.OK)
    {
        path = browser.SelectedPath;            
    }       
}   
path.Dump();

I tried to initialize the form in ShowDialog with the settings, but had problems so I opted to declare it before show dialog. Hope this helps anyone with this problem.