如何抑制 "possible unintended reference comparison" 警告？

Question

在这种情况下我得到 "possible unintended reference comparison"：

class Parent {
    class Child : IEquitable<Child> {
        private readonly int index;
        private readonly Parent parent;
        internal Child(Parent parent, int index) {
            this.parent = parent;
            this.index = index;
        }
        public override int GetHashCode() {
            return parent.GetHashCode()*31 + index.GetHashCode();
        }
        public override bool Equals(object obj) {
            Child other = obj as Child.
            return other != null && Equals(other);
        }
        public override bool Equals(Child other) {
            // The warning I get is on the next line:
            return parent == other.parent && index == other.index;
        }
    }
    ...
}

但是，在这种情况下，引用比较是完全有意的，因为我希望 Child 不同父对象的对象被认为彼此不相等。我如何告诉编译器我的意图，并抑制警告？

Answer 1

尽管您可以使用 #pragma to suppress warning in this situation, using ReferenceEquals 提供了更好的选择：

public override bool Equals(Child other) {
    return ReferenceEquals(parent, other.parent) && index == other.index;
}

除了消除警告之外，此选项还让阅读您代码的其他程序员清楚地知道引用比较不是错误。

如何抑制 "possible unintended reference comparison" 警告？

How to suppress "possible unintended reference comparison" warning?

.net

c#

warnings

suppress-warnings