c# - Linq 中的通用查询

Question

我想在 wpf 中进行通用搜索 UserControl。我希望它获取对象的集合和要搜索的属性的名称。 问题是我无法使用泛型，因为调用搜索函数的代码也无法知道类型。

有办法实现这一点吗？或者某种方式来查询另一种类型下的对象？

Answer 1

考虑这个例子。

interface IFoo
    {

    }
    class Bar1 : IFoo
    {
        //interface implementations
        public string Property1 { get; set; }

        public string myProperty1 { set; get; }
    }

    class Bar2 : IFoo
    {
        //interface implementations
        public string Property1 { get; set; }

        public string myProperty1 { set; get; }
    }


    //Search the list of objects and access the original values.
    List<IFoo> foos = new List<IFoo>();
        foos.Add(new Bar1
        {
            Property1 = "bar1",
            myProperty1 ="myBar1"
        });
        foos.Add(new Bar1());

        foos.Add(new Bar2());
        foos.Add(new Bar2());

        //Get the objects.
        foreach (var foo in foos)
        {
            //you can access foo directly without knowing the original class.
            var fooProperty = foo.Property1;

            //you have to use reflection to get the original type and its properties and methods
            Type type = foo.GetType();
            foreach (var propertyInfo in type.GetProperties())
            {
                var propName = propertyInfo.Name;
                var propValue = propertyInfo.GetValue(foo);
            }
        }


var result = list.Where(a => a.propertyName);