public void IsNullableEquals(string check, bool expected) { var testCode = @" namespace RoslynSandbox { using System; public class Foo { private int? bar1; private Nullable<int> bar2; private int bar3; private double? bar4; private string bar5; public Foo() { Nullable.Equals(this.bar1, this.bar1); } public int? Bar1 => this.bar1; } }"; testCode = testCode.AssertReplace("Nullable.Equals(this.bar1, this.bar1)", check); var syntaxTree = CSharpSyntaxTree.ParseText(testCode); var compilation = CSharpCompilation.Create("test", new[] { syntaxTree }, MetadataReferences.FromAttributes()); var semanticModel = compilation.GetSemanticModel(syntaxTree); var invocation = syntaxTree.FindInvocation(check); var arg0 = semanticModel.GetSymbolSafe(invocation.ArgumentList.Arguments[0].Expression, CancellationToken.None); var arg1 = semanticModel.GetSymbolSafe(invocation.ArgumentList.Arguments[1].Expression, CancellationToken.None); Assert.AreEqual(expected, Equality.IsNullableEquals(invocation, semanticModel, CancellationToken.None, arg0, arg1)); Assert.AreEqual(expected, Equality.IsNullableEquals(invocation, semanticModel, CancellationToken.None, arg1, arg0)); }
private static bool IsEqualsCheck(ExpressionSyntax expression, SemanticModel semanticModel, CancellationToken cancellationToken, IParameterSymbol value, ISymbol member) { var equals = expression as InvocationExpressionSyntax; if (equals == null) { return(false); } if (Equality.IsObjectEquals(equals, semanticModel, cancellationToken, value, member) || Equality.IsInstanceEquals(equals, semanticModel, cancellationToken, value, member) || Equality.IsInstanceEquals(equals, semanticModel, cancellationToken, member, value) || Equality.IsReferenceEquals(equals, semanticModel, cancellationToken, value, member) || Equality.IsEqualityComparerEquals(equals, semanticModel, cancellationToken, value, member) || Equality.IsNullableEquals(equals, semanticModel, cancellationToken, value, member)) { return(true); } return(false); }