C＃和XAML中Windows Phone開發中的屬性錯誤

Question

這是2014年的水上黑客馬拉松項目。 我是Windows Phone的新手。 我正在為一個項目開發一個應用程序。 該應用程序的一部分是，用戶將輸入他的電話號碼和一些文本，並將該數字和文本通過電子郵件發送給特定的人。 我使用了拖放UI，並在Visual C＃中編寫了電子郵件發送代碼。 這是錯誤：

Failed to assign to property 'System.Windows.UIElement.AllowDrop'.[Line: 53 Position: 76]
at
System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
at
PhoneApp2.MainPage.InitializeComponent()
at PhoneApp2.MainPage..ctor()

C＃代碼的一部分：

   private void emailSend(object sender, RoutedEventArgs e)
    {
        // Create a new instance of the class EmailComposeTask with which you can send email
        var emailcomposer = new EmailComposeTask

        {
            // I enter the recipients to send the email using the To property of the class                         
                 EmailComposeTask
            To = string.Concat("mailto:","ibtehaz.shawon@gmail.com"),

            // Set the title of the property by Subject
            Subject = "number",

            // Enhanced the value of the Body property EmailComposeTask class, this is the 
                   content that will display the recipient
            Body = bigText.Text,
        };

        // Start the email application on your device to send the Email
        emailcomposer.Show();
    }

XAML文件的一部分：

      <TextBlock Text="Wheres the problem" Style="{StaticResource PhoneTextNormalStyle}" 
             FontSize="36" FontFamily="Andalus"/>

    </StackPanel>

    <!--ContentPanel - place additional content here-->
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="10,0,14,0" 
      RenderTransformOrigin="0.463,0.232">
        <TextBox Name="number" HorizontalAlignment="Left" Height="88" Margin="0,98,0,0"   
        TextWrapping="Wrap" Text="Please enter your phone number" VerticalAlignment="Top" 
        Width="456"/>

        <TextBlock Name="bigText" HorizontalAlignment="Left" AllowDrop="True" TextWrapping="Wrap" 
           Text="Users will write their problem in here." VerticalAlignment="Top" 
            Margin="0,231,0,0" Height="414" Width="456" Foreground="White"/>

    </Grid>
    <Button Name="sendButton" Content="Send your problem" HorizontalAlignment="Stretch" 
      VerticalAlignment="Top" Margin="10,658,0,0" Grid.Row="1" BorderBrush="#FF996D6D" 
     Background="#FF081359"/>

先感謝您。

Answer 1

您需要替換TextBlock 。 TextBlock僅用於顯示文本，因此您無法對其進行編輯（例如，將文本拖放到其上）。 TextBox允許輸入，並允許您將文本放入其中。

<!--ContentPanel - place additional content here-->
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="10,0,14,0" 
      RenderTransformOrigin="0.463,0.232">
        <TextBox Name="number" HorizontalAlignment="Left" Height="88" Margin="0,98,0,0"   
        TextWrapping="Wrap" Text="Please enter your phone number" VerticalAlignment="Top" 
        Width="456"/>

        <TextBox Name="bigText" HorizontalAlignment="Left" AllowDrop="True" TextWrapping="Wrap" 
           Text="Users will write their problem in here." VerticalAlignment="Top" 
            Margin="0,231,0,0" Height="414" Width="456" Foreground="White"/>

    </Grid>
    <Button Name="sendButton" Content="Send your problem" HorizontalAlignment="Stretch" 
      VerticalAlignment="Top" Margin="10,658,0,0" Grid.Row="1" BorderBrush="#FF996D6D" 
     Background="#FF081359"/>