C# 如何在WindowsPhone8.1C上将位图图像插入sqlite数据库#
我已经设法从手机库中挑选了一张图片并显示出来。这是代码。问题是如何将此图像插入我的Sqlite联系人数据库,并在获取图像后检索并再次显示?这是我的密码。请在此提供详细的分步说明C# 如何在WindowsPhone8.1C上将位图图像插入sqlite数据库#,c#,windows-phone-8.1,C#,Windows Phone 8.1,我已经设法从手机库中挑选了一张图片并显示出来。这是代码。问题是如何将此图像插入我的Sqlite联系人数据库,并在获取图像后检索并再次显示?这是我的密码。请在此提供详细的分步说明 namespace Mobile_Life.Pages { public sealed partial class NextOFKin_Update_Delete : Page { int Selected_ContactId = 0; DatabaseHelperCl
namespace Mobile_Life.Pages
{
public sealed partial class NextOFKin_Update_Delete : Page
{
int Selected_ContactId = 0;
DatabaseHelperClass Db_Helper = new DatabaseHelperClass();
Contacts currentcontact = new Contacts();
CoreApplicationView view;
public NextOFKin_Update_Delete()
{
this.InitializeComponent();
HardwareButtons.BackPressed += HardwareButtons_BackPressed;
view = CoreApplication.GetCurrentView();
}
private void HardwareButtons_BackPressed(object sender, BackPressedEventArgs e)
{
if (Frame.CanGoBack)
{
e.Handled = true;
Frame.GoBack();
}
}
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
await StatusBar.GetForCurrentView().ShowAsync();
Selected_ContactId = int.Parse(e.Parameter.ToString());
currentcontact = Db_Helper.ReadContact(Selected_ContactId);//Read selected DB contact
namestxt.Text = currentcontact.Name;//get contact Name
relationtxt.Text = currentcontact.Relation;//get contact relation
phonetxt.Text = currentcontact.PhoneNumber;//get contact PhoneNumber
}
private void Update_click(object sender, RoutedEventArgs e)
{
currentcontact.Name = namestxt.Text;
currentcontact.Relation = relationtxt.Text;
currentcontact.PhoneNumber = phonetxt.Text;
Db_Helper.UpdateContact(currentcontact);//Update selected DB contact Id
Frame.Navigate(typeof(NextOfKin));
}
private void Delete_click(object sender, RoutedEventArgs e)
{
Db_Helper.DeleteContact(Selected_ContactId);//Delete selected DB contact Id.
Frame.Navigate(typeof(NextOfKin));
}
private void profile_img(object sender, TappedRoutedEventArgs e)
{
FileOpenPicker filePicker = new FileOpenPicker();
filePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
filePicker.ViewMode = PickerViewMode.Thumbnail;
// Filter to include a sample subset of file types
filePicker.FileTypeFilter.Clear();
filePicker.FileTypeFilter.Add(".bmp");
filePicker.FileTypeFilter.Add(".png");
filePicker.FileTypeFilter.Add(".jpeg");
filePicker.FileTypeFilter.Add(".jpg");
filePicker.PickSingleFileAndContinue();
view.Activated += viewActivated;
}
private async void viewActivated(CoreApplicationView sender, IActivatedEventArgs args1)
{
FileOpenPickerContinuationEventArgs args = args1 as FileOpenPickerContinuationEventArgs;
if (args != null)
{
if (args.Files.Count == 0) return;
view.Activated -= viewActivated;
StorageFile storageFile = args.Files[0];
var stream = await storageFile.OpenAsync(FileAccessMode.Read);
var bitmapImage = new BitmapImage();
await bitmapImage.SetSourceAsync(stream);
var decoder = await Windows.Graphics.Imaging.BitmapDecoder.CreateAsync(stream);
profile.ImageSource = bitmapImage;
}
}
}
最好的方法是不要将图像存储在SQLite中。只需将其复制到您的
ApplicationData.Current.local文件夹
,然后保存路径
如果您真的想在SQLite中存储位图图像,只需将其转换为字节数组:为什么不将手机库中图像的路径保存到SQLite数据库中,而不是尝试与图像本身相同?我们将尝试一下。虽然万一用户从手机上删除图像,它不会受到影响吗?