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Contracts - a way to verify the transferred parameters in a concise way. Contracts are intended to replace the cumbersome constructions of condition checks, such as:
if (string.IsNullOrWhiteSpace(str?.Trim())) { throw new Exception("The value is incorrect"); }
Instead, just write:
Contract.StringFilled<Exception>(str);
The same goes for null checks:
Contract.NotNull<object, ArgumentNullException>(obj);
Logic checks:
Contract.MoreOrEqualThan<int, InvalidOperationException>(first, second);
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Check - a static class similar to the Contract class, but returns a Boolean value instead of throwing an exception.
if (Check.NotNull<object>(obj)) // true if obj isn't null
String checks:
string str = ""; if (Check.StringFilled(str)) // false because str is empty
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Condition - allows you to build a chain of logical conditions.
int a = 10; int b = 20; var result = Condition .Check(a == 10) .And(b == 20); .Or(b == 5) .Not() // now it's false
- And others...
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BaseViewModel contains an implementation of the
INotifyPropertyChangedinterface with theOnPropertyChanged()method to notify observers about a change in the value of the observed object.The generic
SetPropertymethod is designed to assign values to observable objects and notify about their change. -
IMessage is an interface for solving the problem of calling a dialog from a ViewModel without interacting with the View layer.
// View layer public class Message : IMessage { public void Report() { MessageBox.Show("Message for user" ); } public MainWindow() { DataContext = new ViewModel(new Message()); } // ViewModel layer class ViewModel { public ViewModel(IMessage message) { message.Report(); } }
- And others...
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PlaceholderTextBox, NumberBox, CompactButton, FontIcon
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- And others...
