使用属性或方法公开C#中的业务规则?

使用属性调用

Rules rules = new Rules();
if ( rules.ProjectRequiresApproval ) {
    // get approval
} else {
    // skip approval
}

使用方法调用

Rules rules = new Rules();
if ( rules.ProjectRequiresApproval() ) {
    // get approval
} else {
    // skip approval
}

public class Rules() {
    private int _amount;
    private int threshold = 100;

    public Rules()  {
        _amount = someExpensiveXpathOperation;
    }

    // rule property
    public bool ProjectRequiresApproval {
        get { return _amount > threshold }
    }
}

规则类将规则公开为方法

public class Rules() {
    private int _amount;
    private int threshold = 100;

    public Rules()  {
        _amount = someExpensiveXpathOperation;
    }

    // rule method
    public bool ProjectRequiresApproval() {
        return _amount > threshold;
    }
}

一个对另一个有什么好处和坏处?