uwp

问题 UWP is killing me..... I had to reinstall VisualStudio2017 after a computer crash. And now, my app that was working perfectly well before the crash refuses to work. I've been using the broadFileSystemAccess capability in the Package Manifest, as per the instructions in the MS documentation: xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities" IgnorableNamespaces="rescap uap mp desktop4 iot2"> and <Capabilities> <rescap:Capability Name=

问题 FileOpenPicker picker = new FileOpenPicker(); picker.ViewMode = PickerViewMode.Thumbnail; picker.SuggestedStartLocation = PickerLocationId.ComputerFolder; picker.FileTypeFilter.Add(".txt"); A user chooses a file to open. How can I store/copy/save that file to localstorage for future use, so every time the app opens, it picks automatically that file? 回答1: After the user opens the file using the FileOpenPicker you can "cache" access to it using StorageApplicationPermissions API. Once you have

问题 FileOpenPicker picker = new FileOpenPicker(); picker.ViewMode = PickerViewMode.Thumbnail; picker.SuggestedStartLocation = PickerLocationId.ComputerFolder; picker.FileTypeFilter.Add(".txt"); A user chooses a file to open. How can I store/copy/save that file to localstorage for future use, so every time the app opens, it picks automatically that file? 回答1: After the user opens the file using the FileOpenPicker you can "cache" access to it using StorageApplicationPermissions API. Once you have

问题 I have a GridView like below <GridView SelectionMode="None" IsItemClickEnabled="True" IsRightTapEnabled="True" ItemsSource="{x:Bind SymbolItems}" ItemClick="SymbolGridView_ItemClick" RightTapped="SymbolGridView_RightTapped"> <GridView.ItemTemplate> <DataTemplate x:DataType="data:SoundSymbolItem"> <local:SymbolControl/> </DataTemplate> </GridView.ItemTemplate> </GridView> I have a ItemClick handler and I can get the clicked symbolItem successfully private void SymbolGridView_ItemClick(object

问题 I have a GridView like below <GridView SelectionMode="None" IsItemClickEnabled="True" IsRightTapEnabled="True" ItemsSource="{x:Bind SymbolItems}" ItemClick="SymbolGridView_ItemClick" RightTapped="SymbolGridView_RightTapped"> <GridView.ItemTemplate> <DataTemplate x:DataType="data:SoundSymbolItem"> <local:SymbolControl/> </DataTemplate> </GridView.ItemTemplate> </GridView> I have a ItemClick handler and I can get the clicked symbolItem successfully private void SymbolGridView_ItemClick(object

问题 I have a GridView like below <GridView SelectionMode="None" IsItemClickEnabled="True" IsRightTapEnabled="True" ItemsSource="{x:Bind SymbolItems}" ItemClick="SymbolGridView_ItemClick" RightTapped="SymbolGridView_RightTapped"> <GridView.ItemTemplate> <DataTemplate x:DataType="data:SoundSymbolItem"> <local:SymbolControl/> </DataTemplate> </GridView.ItemTemplate> </GridView> I have a ItemClick handler and I can get the clicked symbolItem successfully private void SymbolGridView_ItemClick(object

问题 In my UWP app, I've got an async method (event handler) that calls another async method, which attempts to insert a record into a database. I'm getting an exception in the insertion attempt, and am trying to sherlock why it's happening. So I put a breakpoint in the InsertMapRecord() method, on the first "using" line: using (SqliteConnection conn = new SqliteConnection(connStr)) When I reach that breakpoint, I hit F10, but instead of taking me to the next line in the Insert method, it takes me

问题 I'm getting the following err msg: ...when I try to write to my SQLite database like so: private async Task InsertMapRecord(string mapName, string mapNotes) { path = folder.Path; connStr = string.Format(connStrBase, path); try { SqliteConnection conn = new SqliteConnection(connStr); String query = "INSERT INTO CartographerMain " + "(MapName, MapNotes) " + "VALUES (@MapName, @MapNotes)"; using (SqliteCommand cmd = new SqliteCommand(query, conn)) { cmd.Parameters.AddWithValue("@MapName",

问题 I'm getting the following err msg: ...when I try to write to my SQLite database like so: private async Task InsertMapRecord(string mapName, string mapNotes) { path = folder.Path; connStr = string.Format(connStrBase, path); try { SqliteConnection conn = new SqliteConnection(connStr); String query = "INSERT INTO CartographerMain " + "(MapName, MapNotes) " + "VALUES (@MapName, @MapNotes)"; using (SqliteCommand cmd = new SqliteCommand(query, conn)) { cmd.Parameters.AddWithValue("@MapName",

问题 I want to set menu flyout background either in c# or xaml. I want like this <FlyoutBase.AttachedFlyout> <MenuFlyout x:Name="Flyout"> <MenuFlyout.Items > <MenuFlyoutItem Text="Add Expense" Click="AddExpense_Click"/> <MenuFlyoutItem Text="Add Friends" Click="AddFriends_Click"/> </MenuFlyout.Items> </MenuFlyout> </FlyoutBase.AttachedFlyout> ... And this is my xaml code for menu fly-out 回答1: For your requirement, you could custom MenuFlyoutPresenterStyle like the following <MenuFlyout x:Name=