Question

我想构建一个辅助方法，它将属性作为匿名方法的对象。这只是虚拟代码示例，可视化问题而不是面对真正的解决方案，这种解决方案更复杂，不受此问题的影响。

一些参考代码：

public class FooClass : SomeBaseClass {
    public string StringProperty { get; set; }

    public int IntProperty { get; set; }

    public DateTime DateTimeProperty { get; set; }

    public Object ComplexObjectProperty { get; set; }

    public FooClass() {
        this.FooMethod(this.StringProperty);
        this.FooMethod(this.IntProperty);
        this.FooMethod(this.DateTimeProperty);
        this.FooMethod(this.ComplexObjectProperty);
    }

    public void FooMethod<T>(T obj) {
        Func<bool> validateMethod = () => {
            if(obj is string) return string.IsNullOrEmpty(obj.ToString());
            return obj != null;
        };
        this.ValidateMethodsAggregate.Add(validateMethod);
    }
}

public class SomeBaseClass {
    protected IList<Func<bool>> ValidateMethodsAggregate = new List<Func<bool>>();

    public void ValidateAll() {
        foreach (var validateMethod in this.ValidateMethodsAggregate) {
            var result = validateMethod();
            // has errors and so on handling...
        }
    }
}

// Some simple code to show use case.
        var foo = new FooClass();
        foo.StringProperty = "new value";
        foo.IntProperty = 123;
        foo.ValidateAll(); // this will use "" , 0 instead of new values.

Answer 1

使用具有私有后备方法的函数和条件运算符

        public FooClass()
        {
            this.FooMethod(() => StringProperty); // <- pass an accessor
        }
        public Func<bool> validateMethod;
        private void FooMethod<T>(Func<T> obj)
        {
            //validate method
            validateMethod = () => string.IsNullOrEmpty(obj()?.ToString());
        }

用法是

        var y = new FooClass();
        var resTrue = y.validateMethod();
        y.StringProperty = "Hi";
        var resFalse = y.validateMethod();

将属性作为对象传递给方法

1 个答案: