private static InvocationExpressionSyntax CreateCombineSyntax(IEnumerable <PropertyDeclarationSyntax> properties)
{
var args = properties.Select(p => Argument(PropertyAccessSyntax.Create(p.Identifier)));
// HashCode.Combine(this.Property1, this.Property2)
return(InvocationExpression(AccessMemberSyntax.Create("HashCode.Combine"))
.WithArgumentList(ArgumentList(SeparatedList(args))));
}
private static BlockSyntax CreateAddSyntax(IList <PropertyDeclarationSyntax> properties)
{
// var hash = new HashCode();
var declaration = VariableDeclaration.Create("hash", nameof(HashCode));
var addExpressions = properties.Select(CreateAddInvocation).Cast <StatementSyntax>().ToList();
// return hash.ToHashCode();
var returnStatement = ReturnStatement(
InvocationExpression(AccessMemberSyntax.Create("hash.ToHashCode")));
var statements = new StatementSyntax[addExpressions.Count + 2];
statements[0] = declaration;
addExpressions.CopyTo(statements, 1);
statements[^ 1] = returnStatement;