- [CanBeNull] object Test() => null;
-
- void UseTest() {
- var p = Test();
- var s = p.ToString(); // Warning: Possible 'System.NullReferenceException'
- }
-
- [NotNull] object Foo() {
- return null; // Warning: Possible 'null' assignment
- }
-
- [StringFormatMethod("message")]
- void ShowError(string message, params object[] args) { /* do something */ }
-
- void Foo() {
- ShowError("Failed: {0}"); // Warning: Non-existing argument in format string
- }
-
- void Foo(string param) {
- if (param == null)
- throw new ArgumentNullException("par"); // Warning: Cannot resolve symbol
- }
-
- public class Foo : INotifyPropertyChanged {
- public event PropertyChangedEventHandler PropertyChanged;
-
- [NotifyPropertyChangedInvocator]
- protected virtual void NotifyChanged(string propertyName) { ... }
-
- string _name;
-
- public string Name {
- get { return _name; }
- set { _name = value; NotifyChanged("LastName"); /* Warning */ }
- }
- }
-
- Examples of generated notifications:
- Function Definition Table syntax:
-
- [ContractAnnotation("=> halt")]
- public void TerminationMethod()
-
- [ContractAnnotation("halt <= condition: false")]
- public void Assert(bool condition, string text) // regular assertion method
-
- [ContractAnnotation("s:null => true")]
- public bool IsNullOrEmpty(string s) // string.IsNullOrEmpty()
-
- // A method that returns null if the parameter is null,
- // and not null if the parameter is not null
- [ContractAnnotation("null => null; notnull => notnull")]
- public object Transform(object data)
-
- [ContractAnnotation("=> true, result: notnull; => false, result: null")]
- public bool TryParse(string s, out Person result)
-
- [LocalizationRequiredAttribute(true)]
- class Foo {
- string str = "my string"; // Warning: Localizable string
- }
-
- [CannotApplyEqualityOperator]
- class NoEquality { }
-
- class UsesNoEquality {
- void Test() {
- var ca1 = new NoEquality();
- var ca2 = new NoEquality();
- if (ca1 != null) { // OK
- bool condition = ca1 == ca2; // Warning
- }
- }
- }
-
- [BaseTypeRequired(typeof(IComponent)] // Specify requirement
- class ComponentAttribute : Attribute { }
-
- [Component] // ComponentAttribute requires implementing IComponent interface
- class MyComponent : IComponent { }
-
- [Pure] int Multiply(int x, int y) => x * y;
-
- void M() {
- Multiply(123, 42); // Waring: Return value of pure method is not used
- }
-
- class Foo {
- [ProvidesContext] IBarService _barService = ...;
-
- void ProcessNode(INode node) {
- DoSomething(node, node.GetGlobalServices().Bar);
- // ^ Warning: use value of '_barService' field
- }
- }
-
- [SourceTemplate]
- public static void forEach<T>(this IEnumerable<T> xs) {
- foreach (var x in xs) {
- //$ $END$
- }
- }
-
-
- [SourceTemplate, Macro(Target = "item", Expression = "suggestVariableName()")]
- public static void forEach<T>(this IEnumerable<T> collection) {
- foreach (var item in collection) {
- //$ $END$
- }
- }
-
- Applying the attribute on a template method parameter:
-
- [SourceTemplate]
- public static void something(this Entity x, [Macro(Expression = "guid()", Editable = -1)] string newguid) {
- /*$ var $x$Id = "$newguid$" + x.ToString();
- x.DoSomething($x$Id); */
- }
-
-
- [ActionName("Foo")]
- public ActionResult Login(string returnUrl) {
- ViewBag.ReturnUrl = Url.Action("Foo"); // OK
- return RedirectToAction("Bar"); // Error: Cannot resolve action
- }
-
- Filters filters = new Filters();
- foreach ( Filter f in filters.VideoInputDevices )
- {
- Debug.WriteLine( f.Name );
- }
-
-
- string savedMonikerString = myFilter.MonikerString;
-
-
- To recall the filter create a new Filter class and pass the
- string to the constructor:
-
- Filter mySelectedFilter = new Filter( savedMonikerString );
-
-