- /// [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
- /// }
- ///
- ///
- /// public void Foo([ItemNotNull]List<string> books)
- /// {
- /// foreach (var book in books) {
- /// if (book != null) // Warning: Expression is always true
- /// Console.WriteLine(book.ToUpper());
- /// }
- /// }
- ///
- ///
- /// public void Foo([ItemCanBeNull]List<string> books)
- /// {
- /// foreach (var book in books)
- /// {
- /// // Warning: Possible 'System.NullReferenceException'
- /// Console.WriteLine(book.ToUpper());
- /// }
- /// }
- ///
- ///
- /// [StringFormatMethod("message")]
- /// void ShowError(string message, params object[] args) { /* do something */ }
- ///
- /// void Foo() {
- /// ShowError("Failed: {0}"); // Warning: Non-existing argument in format string
- /// }
- ///
- ///
- /// namespace TestNamespace
- /// {
- /// public class Constants
- /// {
- /// public static int INT_CONST = 1;
- /// public const string STRING_CONST = "1";
- /// }
- ///
- /// public class Class1
- /// {
- /// [ValueProvider("TestNamespace.Constants")] public int myField;
- /// public void Foo([ValueProvider("TestNamespace.Constants")] string str) { }
- ///
- /// public void Test()
- /// {
- /// Foo(/*try completion here*/);//
- /// myField = /*try completion here*/
- /// }
- /// }
- /// }
- ///
- ///
- /// 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("null <= param:null")] // reverse condition syntax
- /// public string GetName(string surname)
- ///
- ///
- /// [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
- /// }
- ///
- /// [MustUseReturnValue("Use the return value to...")].
- ///
- /// 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
- /// }
- ///
- ///
- /// public class MyStringCollection : List<string>
- /// {
- /// [CollectionAccess(CollectionAccessType.Read)]
- /// public string GetFirstString()
- /// {
- /// return this.ElementAt(0);
- /// }
- /// }
- /// class Test
- /// {
- /// public void Foo()
- /// {
- /// // Warning: Contents of the collection is never updated
- /// var col = new MyStringCollection();
- /// string x = col.GetFirstString();
- /// }
- /// }
- ///
- ///
- /// static void ThrowIfNull<T>([NoEnumeration] T v, string n) where T : class
- /// {
- /// // custom check for null but no enumeration
- /// }
- ///
- /// void Foo(IEnumerable<string> values)
- /// {
- /// ThrowIfNull(values, nameof(values));
- /// var x = values.ToList(); // No warnings about multiple enumeration
- /// }
- ///
- ///