我正在創建一個UWP應用程序,我希望用戶能夠上傳照片。我有ContentDialog
與Button
和兩個TextBoxes
。當用戶按下「上傳照片」Button
時應彈出ContentDialog
。我如何使用MVVM來做到這一點?使用帶MVVM的ICommand在UWP中顯示ContentDialog
查找文件並將文件發佈到數據庫的邏輯已經完成,只剩下UI了。
這是我的XAML:
<!-- Content -->
<Button Content="Upload a photo to gallery" Margin="40,0,0,0" x:Name="UploadPhotoButton" Command="{x:Bind MyProfileViewModel.OpenContentDialog}"/>
<!-- More content -->
<!-- This is the ContentDialog I want to display when the user presses the button above -->
<ContentDialog x:Name="UploadPhotoContentDialog"
PrimaryButtonText="Upload" IsPrimaryButtonEnabled="{Binding IsValid}"
SecondaryButtonText="Cancel" IsSecondaryButtonEnabled="True">
<ContentDialog.TitleTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<SymbolIcon Symbol="BrowsePhotos"/>
<TextBlock Margin="10,0,0,0" Text="Upload photo "/>
</StackPanel>
</DataTemplate>
</ContentDialog.TitleTemplate>
<Grid Padding="10" Margin="0,10,0,0">
<Grid.RowDefinitions>
<RowDefinition Height="1*"/>
<RowDefinition Height="1*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBlock Text="Photo Title:" VerticalAlignment="Center"/>
<TextBox Text="{Binding PhotoTitle, Mode=TwoWay}" PlaceholderText="Example: Fun in the sun" Grid.Column="1"/>
<TextBlock Text="Photo Caption:" Grid.Row="1" VerticalAlignment="Center"/>
<TextBox Text="{Binding PhotoDesc, Mode=TwoWay}" PlaceholderText="Example: Don't you just love the beach" Grid.Row="1" Grid.Column="1"/>
<Button Content="Browse files..." Grid.Column="0" Grid.Row="2" Margin="0,20,0,0" Command="{x:Bind MyProfileViewModel.FindFile}"/>
<TextBox Text="{Binding FileName, Mode=TwoWay}" Grid.Row="2" Grid.Column="1" Margin="10,20,0,0" FontSize="12" Height="32" IsReadOnly="True" />
</Grid>
</ContentDialog>
到目前爲止,這裏是我的C#文件(MyProfileViewModel):
public ICommand OpenContentDialog => new CommandHandler(async() => {
// What to put in here to find the ContentDialog, then display it?
});
我試過了你的代碼,但我只是收到一個錯誤,說Action沒有帶1個參數。我嘗試使用CommandHandler,並創建一個RelayCommand類。兩者都沒有工作:/ – Fred
@Fred它取決於你的命令類是如何實現的。一般來說,您應該有一個接受參數的實現。我發現你已經找到了合適的命令類,因此我不會編輯答案。 – Romasz