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swiftui text, how can I pass a bool value to func hidden ()

By : Raushan Alleyne
Date : October 01 2020, 12:00 AM
it fixes the issue You can return the .hidden() version of the view when some state is enabled like this (note that the hidden version and non hidden version are two different types which is why the type eraser is necessary -- some View means all exists from the function must return the same type that conforms to View):
code :
struct ContentView: View {
  @State var isHidden = false
    var body: some View {
        let text = Text("Bitte Password eingeben")
        .padding(EdgeInsets(top: 50, leading: 5, bottom: 0, trailing: 0))
        return isHidden ? AnyView(text) : AnyView(text.hidden())

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Can you Pass Func<T,bool> Through a WCF Service?

By : hjke
Date : March 29 2020, 07:55 AM
To fix the issue you can do There's work happening to enable it. Check out the Expression Tree Serialization project on the MSDN Code Gallery.

Can I use Expression<Func<T, bool>> and reliably see which properties are referenced in the Func<T, bool&

By : Vecna
Date : March 29 2020, 07:55 AM
may help you . Yes, you'll be able to see everything directly referenced. Of course, if someone passes
code :
x => ComputeAge(x) > 18

Can I convert a Func<T, bool> to a Func<U, bool> where T and U are POCO classes where I can map properties o

By : saurabh07
Date : March 29 2020, 07:55 AM
To fix this issue I have a scenario where a method will take a predicate of type Func< T, bool > because the type T is the one that is exposed to the outer world, but when actually using that predicate I need that method to call another method that will take in Func< U, bool > where properties of T are mapped to properties of U. , What I ended up doing did not require the use of Expression Trees:
code :
public IEnumerable<ClientEntity> Search(Func<ClientEntity, bool> predicate)
    IList<ClientEntity> result = new List<ClientEntity>();

    Func<Client, bool> realPredicate = (c => predicate(ConvertFromClient(c)));        
    _dataFacade.Clients.Where(realPredicate).ToList().ForEach(c => result.Add(ConvertFromClient(c)));

    return result.AsEnumerable();

private static ClientEntity ConvertFromClient(Client client)
    ClientEntity result = new ClientEntity();

    if (client != null)
        // I actually used AutoMapper from http://automapper.org/ here instead of assigning every property.
        result.Id = client.Id;
        result.Name = client.Name;

    return result;

Convert Func<TDao, bool> to Func<TEntity, bool>

By : David
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I don't have the exact code handy, but you will probably want to consume the expression provided and perform the equivalency conversion yourself.
This stackoverflow question is along the lines of what I would do.
code :
    Expression<Func<B, bool>> MapFun<A, B>(Expression<Func<A, bool>> input)where A : class
        var result = DbAccessLayer.TransformPredicateLambda<A,B>(input);
        return result;
public static Expression<Func<TNewTarget, bool>> TransformPredicateLambda<TOldTarget, TNewTarget>(Expression<Func<TOldTarget, bool>> predicate)

Passing a GetWhere query (Func<entityDTO,bool>) to a data layer method which needs a (Func<entity,bool>) par

By : Serhii Petrovych
Date : March 29 2020, 07:55 AM
To fix the issue you can do Firstly I would suggest that you put a querying layer of your own in front of Entity Framework rather than allowing any arbitrary Func to be passed in because it will be very easy in the future to pass a Func that Entity Framework can not translate into a SQL statement (it can only translate some expressions - the basics are fine but if your expression calls a C# method, for example, then Entity Framework will probably fail).
So your search layer could have classes that you build up as criteria (eg. a "ContainsName" search class or a "ProductHasId" class) that are then translated into expressions in your search layer. This separates your app entirely from the ORM, which means that ORM details (like the entities or like the limitations of what Funcs can and can't be translated) don't leak out. There's lots out there that's been written about this some of arrangement.
code :
var results = context.Products
    .Select(p => new { ID = p.ProductID, Name = p.ProductName })
    .Where(p => p.ID < 10)
    [Extent1].[ProductID] AS [ProductID], 
    [Extent1].[ProductName] AS [ProductName]
FROM [dbo].[Products] AS [Extent1]
WHERE [Extent1].[ProductID] < 10
return context.Products
    .Map<Product, ProductDTO()>()
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