.NET
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issue opened here : https://github.com/dotnet/core/issues/9137
[BUG] System::Windows::Forms::OpenFileDialog::AutoUpgradeEnabled does not work correctly with NetCore 8.0
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(70.4, 81%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EPC%3C/text%3E%3C/svg%3E)
Pierre Chatelier
81
Reputation points
When setting AutoUpgradeEnabled to false in an System::Windows::Forms::OpenFileDialog
- everything goes right in a .Net 4.8 project
- no filenames are returned when exiting the dialog in a .Net 8.0 project (netcore8.0-windows)
To be able to use System::Windows::Forms::OpenFileDialog in a NetCore 8.0 project, <UseWindowsForms>true</UseWindowsForms> must be used.
I don't know if it's relevant, but I have also referenced Microsoft.Windows.Compatibility in my project.
Is there any workaround ?
I need this feature to use customized dialogs.
My reproducer :
System::Windows::Forms::OpenFileDialog^ openFileDialog = gcnew System::Windows::Forms::OpenFileDialog();
openFileDialog->AutoUpgradeEnabled = false;
openFileDialog->Title = "Load...";
openFileDialog->AddExtension = true;
openFileDialog->Multiselect = true;
openFileDialog->DefaultExt = "cfg";
System::String^ filterString = "";
filterString += System::String::Format("{0}{1}",
System::String::IsNullOrEmpty(filterString) ? "" : "|",
"Cfg files" + " (*.cfg)|*.cfg");
filterString += System::String::Format("{0}{1}",
System::String::IsNullOrEmpty(filterString) ? "" : "|",
"All files" + " (*.*)|*.*");
openFileDialog->Filter = filterString;
System::Windows::Forms::DialogResult code = openFileDialog->ShowDialog(this);
//select one or a few files
System::Console::WriteLine("selected count = {0}", openFileDialog->FileNames->Length);//returns 0
If you can't reproduce I can send you a minimum project
.NET
C++
C++
A high-level, general-purpose programming language, created as an extension of the C programming language, that has object-oriented, generic, and functional features in addition to facilities for low-level memory manipulation.
3,636 questions
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(246.4, 86%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDL%3C/text%3E%3C/svg%3E)
David Lowndes 2,510 Reputation points MVP2024-02-06T16:14:47.36+00:00 Do you have a minimal code project example that anyone can use to try and reproduce this - just so there's no ambiguity.
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David Lowndes 2,510 Reputation points MVP
2024-02-06T16:27:25.81+00:00 The following works for me in a .NET 8 console project under Windows 10:
The output contains the file name selected in the dialog.[STAThread] static void Main(string[] args) { var ofd = new System.Windows.Forms.OpenFileDialog(); ofd.AutoUpgradeEnabled = false; ofd.ShowDialog(); Console.WriteLine("Hello, World!" + ofd.FileNames[0] ); } -
Pierre Chatelier 81 Reputation points
2024-02-06T18:42:14.36+00:00 I am currently away from Keyboard, I will post code tomorrow. Indeed, I have a few options (like Filters, AllowMultipleSelection...) that might play a role.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(64, 85%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJX%3C/text%3E%3C/svg%3E)
Jiale Xue - MSFT 43,046 Reputation points Microsoft Vendor2024-02-07T08:11:08.3266667+00:00 Hi @Pierre Chatelier , Welcome to Microsoft Q&A, Do you have time to add updates?
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Pierre Chatelier 81 Reputation points
2024-02-07T08:54:58.9866667+00:00 My reproducer :
System::Windows::Forms::OpenFileDialog^ openFileDialog = gcnew System::Windows::Forms::OpenFileDialog(); openFileDialog->AutoUpgradeEnabled = false; openFileDialog->Title = "Load..."; openFileDialog->AddExtension = true; openFileDialog->Multiselect = true; openFileDialog->DefaultExt = "cfg"; System::String^ filterString = ""; filterString += System::String::Format("{0}{1}", System::String::IsNullOrEmpty(filterString) ? "" : "|", "Cfg files" + " (*.cfg)|*.cfg"); filterString += System::String::Format("{0}{1}", System::String::IsNullOrEmpty(filterString) ? "" : "|", "All files" + " (*.*)|*.*"); openFileDialog->Filter = filterString; System::Windows::Forms::DialogResult code = openFileDialog->ShowDialog(this); //select one or a few files System::Console::WriteLine("selected count = {0}", openFileDialog->FileNames->Length);//returns 0If you can't reproduce I can send you a minimum project
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(201.6, 57.00000000000001%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMY%3C/text%3E%3C/svg%3E)
Minxin Yu 11,026 Reputation points Microsoft Vendor2024-02-07T09:24:04.66+00:00 What kind of C++CLR project are you using, .NET 8 library?
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David Lowndes 2,510 Reputation points MVP
2024-02-07T09:54:47.0333333+00:00 OK, so it's just the addition of the MultiSelect option that gives rise to this issue.
[STAThread] static void Main(string[] args) { var ofd = new System.Windows.Forms.OpenFileDialog(); ofd.AutoUpgradeEnabled = false; ofd.Multiselect = true; if ( ofd.ShowDialog() == DialogResult.OK ) { Console.WriteLine("Hello, World!" + ofd.FileNames[0]); } } -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(179.20000000000002, 14.000000000000002%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EPC%3C/text%3E%3C/svg%3E)
Pierre CHATELIER 11 Reputation points2024-02-07T10:12:28.57+00:00 I am using netcore8.0-windows
Do I have to open an issue on https://github.com/dotnet/winforms or is this Q&A enough for a bug report ? -
David Lowndes 2,510 Reputation points MVP
2024-02-07T14:09:58.44+00:00 I doubt this would be seen, so best to open an issue.
I'd recommend showing the minimal C# example as a repro so as to make life easy for someone. Please post a link to any issue you create back here so anyone interested can find it.I've had a look at the source code but it's not straightforward - I can't immediately see what should happen in this situation that clearly isn't happening now.
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Viorel 114.7K Reputation points2024-02-07T15:16:13.3066667+00:00 Probably the FileDialog.GetMultiselectFiles function can be fixed.
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