C# IFileDialog.SetDefaultExtension方法代码示例

        internal virtual void PrepareVistaDialog(IFileDialog dialog)
        {
            dialog.SetDefaultExtension(DefaultExt);

            dialog.SetFileName(CriticalFileName);

            if (!string.IsNullOrEmpty(InitialDirectory))
            {
                IShellItem initialDirectory = ShellUtil.GetShellItemForPath(InitialDirectory);
                if (initialDirectory != null)
                {
                    // Setting both of these so the dialog doesn't display errors when a remembered folder is missing.
                    dialog.SetDefaultFolder(initialDirectory);
                    dialog.SetFolder(initialDirectory);
                }
            }

            dialog.SetTitle(Title);

            // Force no mini mode for the SaveFileDialog.
            // Only accept physically backed locations.
            FOS options = ((FOS)Options & c_VistaFileDialogMask) | FOS.DEFAULTNOMINIMODE | FOS.FORCEFILESYSTEM;
            dialog.SetOptions(options);
            
            COMDLG_FILTERSPEC[] filterItems = GetFilterItems(Filter);
            if (filterItems.Length > 0)
            {
                dialog.SetFileTypes((uint)filterItems.Length, filterItems);
                dialog.SetFileTypeIndex(unchecked((uint)FilterIndex));
            }

            IList<FileDialogCustomPlace> places = CustomPlaces;
            if (places != null && places.Count != 0)
            {
                foreach (FileDialogCustomPlace customPlace in places)
                {
                    IShellItem shellItem = ResolveCustomPlace(customPlace);
                    if (shellItem != null)
                    {
                        try
                        {
                            dialog.AddPlace(shellItem, FDAP.BOTTOM);
                        }
                        catch (ArgumentException)
                        {
                            // The dialog doesn't allow some ShellItems to be set as Places (like device ports).
                            // Silently ---- errors here.
                        }
                    }
                }
            }
        }

        private void ApplyNativeSettings(IFileDialog dialog)
        {
            Debug.Assert(dialog != null, "No dialog instance to configure");

            if (parentWindow == IntPtr.Zero)
            {
                if (System.Windows.Application.Current != null && System.Windows.Application.Current.MainWindow != null)
                {
                    parentWindow = (new WindowInteropHelper(System.Windows.Application.Current.MainWindow)).Handle;
                }
                else if (System.Windows.Forms.Application.OpenForms.Count > 0)
                {
                    parentWindow = System.Windows.Forms.Application.OpenForms[0].Handle;
                }
            }

            Guid guid = new Guid(ShellIIDGuid.IShellItem2);

            // Apply option bitflags.
            dialog.SetOptions(CalculateNativeDialogOptionFlags());

            // Other property sets.
            if (title != null) { dialog.SetTitle(title); }

            if (initialDirectoryShellContainer != null)
            {
                dialog.SetFolder(((ShellObject)initialDirectoryShellContainer).NativeShellItem);
            }

            if (defaultDirectoryShellContainer != null)
            {
                dialog.SetDefaultFolder(((ShellObject)defaultDirectoryShellContainer).NativeShellItem);
            }

            if (!string.IsNullOrEmpty(initialDirectory))
            {
                // Create a native shellitem from our path
                IShellItem2 initialDirectoryShellItem;
                ShellNativeMethods.SHCreateItemFromParsingName(initialDirectory, IntPtr.Zero, ref guid, out initialDirectoryShellItem);

                // If we get a real shell item back, 
                // then use that as the initial folder - otherwise,
                // we'll allow the dialog to revert to the default folder. 
                // (OR should we fail loudly?)
                if (initialDirectoryShellItem != null)
                    dialog.SetFolder(initialDirectoryShellItem);
            }

            if (!string.IsNullOrEmpty(defaultDirectory))
            {
                // Create a native shellitem from our path
                IShellItem2 defaultDirectoryShellItem;
                ShellNativeMethods.SHCreateItemFromParsingName(defaultDirectory, IntPtr.Zero, ref guid, out defaultDirectoryShellItem);

                // If we get a real shell item back, 
                // then use that as the initial folder - otherwise,
                // we'll allow the dialog to revert to the default folder. 
                // (OR should we fail loudly?)
                if (defaultDirectoryShellItem != null)
                {
                    dialog.SetDefaultFolder(defaultDirectoryShellItem);
                }
            }

            // Apply file type filters, if available.
            if (filters.Count > 0 && !filterSet)
            {
                dialog.SetFileTypes(
                    (uint)filters.Count,
                    filters.GetAllFilterSpecs());

                filterSet = true;

                SyncFileTypeComboToDefaultExtension(dialog);
            }

            if (cookieIdentifier != Guid.Empty)
            {
                dialog.SetClientGuid(ref cookieIdentifier);
            }

            // Set the default extension
            if (!string.IsNullOrEmpty(DefaultExtension))
            {
                dialog.SetDefaultExtension(DefaultExtension);
            }

            // Set the default filename
            dialog.SetFileName(DefaultFileName);
        }

        internal virtual void SetDialogProperties(IFileDialog dialog)
        {
            uint cookie;
            dialog.Advise(new VistaFileDialogEvents(this), out cookie);

            // Set the default file name
            if( !(_fileNames == null || _fileNames.Length == 0 || string.IsNullOrEmpty(_fileNames[0])) )
            {
                string parent = Path.GetDirectoryName(_fileNames[0]);
                if( parent == null || !Directory.Exists(parent) )
                {
                    dialog.SetFileName(_fileNames[0]);
                }
                else
                {
                    string folder = Path.GetFileName(_fileNames[0]);
                    dialog.SetFolder(NativeMethods.CreateItemFromParsingName(parent));
                    dialog.SetFileName(folder);
                }
            }

            // Set the filter
            if( !string.IsNullOrEmpty(_filter) )
            {
                string[] filterElements = _filter.Split(new char[] { '|' });
                NativeMethods.COMDLG_FILTERSPEC[] filter = new NativeMethods.COMDLG_FILTERSPEC[filterElements.Length / 2];
                for( int x = 0; x < filterElements.Length; x += 2 )
                {
                    filter[x / 2].pszName = filterElements[x];
                    filter[x / 2].pszSpec = filterElements[x + 1];
                }
                dialog.SetFileTypes((uint)filter.Length, filter);

                if( _filterIndex > 0 && _filterIndex <= filter.Length )
                    dialog.SetFileTypeIndex((uint)_filterIndex);
            }

            // Default extension
            if( _addExtension && !string.IsNullOrEmpty(_defaultExt) )
            {
                dialog.SetDefaultExtension(_defaultExt);
            }

            // Initial directory
            if( !string.IsNullOrEmpty(_initialDirectory) )
            {
                IShellItem item = NativeMethods.CreateItemFromParsingName(_initialDirectory);
                dialog.SetDefaultFolder(item);
            }

            // ShowHelp
            if( _showHelp )
            {
                IFileDialogCustomize customize = (IFileDialogCustomize)dialog;
                customize.AddPushButton(HelpButtonId, "&Help");
            }

            if( !string.IsNullOrEmpty(_title) )
            {
                dialog.SetTitle(_title);
            }

            dialog.SetOptions((_options | NativeMethods.FOS.FOS_FORCEFILESYSTEM));
        }