public void IsEqualityComparerEqualsGeneric(string check, bool expected)
{
var testCode = @"
namespace RoslynSandbox
{
using System.Collections.Generic;
public class Foo
{
private int bar1;
private int bar2;
private string bar5;
public bool Bar<T>(T arg1, T arg2)
{
return EqualityComparer<T>.Default.Equals(arg1, arg1);
}
public int? Bar1 => this.bar1;
}
}";
testCode = testCode.AssertReplace("EqualityComparer<T>.Default.Equals(arg1, arg1)", 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.IsEqualityComparerEquals(invocation, semanticModel, CancellationToken.None, arg0, arg1));
Assert.AreEqual(expected, Equality.IsEqualityComparerEquals(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);
}