Make SaveFileDialog support NOTESTFILECREATE.

[DinoChan]

Needs to stop SaveFileDialog from creating an empty file.

The problem for us is that we have configured the file system security so that a file can be created and filled with data, but once it has been closed, it may not be modified or deleted (by a regular user). When our application tries to use file name returned by the SaveFileDialog, that file already exists and we get the following error when we try to fill it with data: “You don’t have permission to modify files in this network location.”

[lindexi]

Because the SaveFileDialog will create a test file to test something and then delete the test file. See GetSaveFileNameA function (commdlg.h) - Win32 apps | Microsoft Docs and OPENFILENAMEA (commdlg.h) - Win32 apps | Microsoft Docs

But the Options is get only that we can not set the OFN_NOTESTFILECREATE flag.

wpf/src/Microsoft.DotNet.Wpf/src/PresentationFramework/Microsoft/Win32/FileDialog.cs

Lines 1680 to 1689 in 12601c5

	protected int Options
	{
	get
	{
	return _dialogOptions.Value & (NativeMethods.OFN_READONLY | NativeMethods.OFN_HIDEREADONLY |
	NativeMethods.OFN_NOCHANGEDIR | NativeMethods.OFN_NOVALIDATE |
	NativeMethods.OFN_ALLOWMULTISELECT | NativeMethods.OFN_PATHMUSTEXIST |
	NativeMethods.OFN_NODEREFERENCELINKS);
	}
	}

[pchaurasia14]

This enhancement has been implemented in .NET 8.

Reference - Link

Hence closing this issue.