Pokud potřebujete otevřít obrázek v prostředí Silverlight do WriteableBitmap můžete použít následují kód:
StreamResourceInfo sri = Application.GetResourceStream(new Uri("/NazevSilverlightProjektu;component/Images/06072011306.jpg", UriKind.Relative));
BitmapImage src = new BitmapImage();
src.SetSource(sri.Stream);
WriteableBitmap wb = new WriteableBitmap(src);
Obrázek bude přitom uložen v ..\NazevSilverlightProjektu\NazevSilverlightProjektu\Images\
Timto způsobem otevřete stream ze souboru (obrázku) a naplníte jím WriteableBitmap.
Nejříve jsem zkoušel postup:
Uri uri = new Uri("Images/Texture.jpg", UriKind.Relative);
BitmapImage imageSource = new BitmapImage(uri);
WriteableBitmap bitmap = new WriteableBitmap(imageSource); // EXCEPTION
ten ale skončil vyjímkou Null reference.
Silverlight – Otevření obrázku do WriteableBitmap
Posted in Nezařazené
that when we have FilterDescriptprs or pagination it will prtogaape to the final SQL query, not we fetch all data from database but then apply filters, is it true?for example in your code above think following method in DomainService public IQueryable GetItems() { return this.ObjectContext.Items; } So if we use this in client side with a datagrid and if we apply filterdescriptors, is that final SQL to the database contains those in where clause or is it fetching all and filtering done at the DomainService?For ex: if we have DomainService method as follows public IQueryable GetAppUsages() { List usage = new List(); for (int i = 0; i < 100; i++) { usage.Add(new AppUsage() { UsageId = i, AppName = "App Name " + i, UserName = "User " + i , CategoryId = i % 5 }); }Which doesn't deal with database at all and if we apply FilterDescriptor for CategoryId still it works, so my question is how to we capture these filterDescriptors at DomainService level and optimize final SQL query by using them if currently filtering done after fetching all records from the database.Thanks return usage.AsQueryable(); }
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