如果属性名称定义为 "name"，如何使用反射获取属性值

Question

我有以下代码来比较两个集合...

    //code invocation
    CollectionComparer comp = new CollectionComparer("name", "ASC");
    this.InnerList.Sort(comp);

class

public class CollectionComparer : IComparer
{
    private String _property;
    private String _order;

    public CollectionComparer(String Property, String Order)
    {
        this._property = Property;
        this._order = Order;
    }

    public int Compare(object obj1, object obj2)
    {
        int returnValue;

        Type type = obj1.GetType();
        PropertyInfo propertie1 = type.GetProperty(_property); // returns null here
        Type type2 = obj2.GetType();
        PropertyInfo propertie2 = type2.GetProperty(_property); // returns null here

        object finalObj1 = propertie1.GetValue(obj1, null); // Null Reference Exception thrown here, because propertie1 is null
        object finalObj2 = propertie2.GetValue(obj2, null);

        IComparable Ic1 = finalObj1 as IComparable;
        IComparable Ic2 = finalObj2 as IComparable;

        if (_order == "ASC")
        {
            returnValue = Ic1.CompareTo(Ic2);
        }
        else
        {
            returnValue = Ic2.CompareTo(Ic1);
        }

        return returnValue;
    }
}

代码似乎工作正常，除非我尝试对名为 "name" 的属性进行排序。当比较属性时，变量 propertie1 和 propertie2 都为空，代码因此抛出异常。

所以我的问题是如何使用反射来获取名称为"name"的属性的值？

Answer 1

对了，_property变量设置了吗？

这个扩展方法怎么样：

public static object GetProperty(this object instance, string name)
    {
        if (instance == null)
            throw new ArgumentNullException("instance");

        if (name == null)
            throw new ArgumentNullException("name");

        Type type = instance.GetType();
        PropertyInfo property = type.GetProperty(name, BindingFlags.Public | BindingFlags.Instance);

        if (property == null)
            throw new InvalidOperationException(string.Format("Type {0} does not have a property {1}", type, name));

        object result = property.GetValue(instance, null);

        return result;
    }

Answer 2

好的，我想通了...我想在进行反射时大写字母很重要...

我需要将代码调用更改为...

//code invocation
CollectionComparer comp = new CollectionComparer("Name", "ASC");
this.InnerList.Sort(comp);

因为属性实际上被称为 "Name" 而不是 "name"

如果属性名称定义为 "name"，如何使用反射获取属性值

How to get a property value using Reflection if the property name is defined as "name"

c#

system.reflection

如果 属性 名称定义为 "name"，如何使用反射获取 属性 值

How to get a property value using Reflection if the property name is defined as "name"

c#

system.reflection

如果属性名称定义为 "name"，如何使用反射获取属性值