为什么当我尝试调用泛型方法时返回null？ [英] Why does it return null when I try to invoke generic methods?

问题描述

我一直在尝试执行泛型方法并使用递归。问题是方法 GetMethod 返回 null 。

I've been trying to execute generic methods and using recursion. The problem is that the method GetMethod returns null. How can I improve the code?

public static T GetElementObject<T>(this XElement element)
{
    T returnObject = Activator.CreateInstance<T>();
    PropertyInfo[] propertyInfos = returnObject.GetType().GetProperties();
    Type propertyType;

    foreach (PropertyInfo propertyInfo in propertyInfos)
    {
        propertyType = propertyInfo.PropertyType;

        if (propertyType.IsAssignableFrom(typeof(BaseProxyEntity)))
        {
            MethodInfo getElementObject = typeof(Utility).GetMethod("GetElementObject<>", System.Reflection.BindingFlags.Static | BindingFlags.Public).MakeGenericMethod(propertyType);
            propertyInfo.SetValue(returnObject, getElementObject.Invoke(null, new object[] { element.Descendants(propertyInfo.Name) }), null);
        }
        else if (propertyType.IsValueType == true)
        {
            MethodInfo CastValue = typeof(Utility).GetMethod("CastValue<>", System.Reflection.BindingFlags.Static | BindingFlags.Public).MakeGenericMethod(propertyType);
            propertyInfo.SetValue(returnObject, CastValue.Invoke(null, new object[] { element.Attribute(propertyInfo.Name).Value }), null);
        }
        //Other else conditions ...
    }

    return returnObject;
}

推荐答案

Eugen Rieck是正确的名称为通用类型而被修改，但它们不会被泛型方法修改。尝试不使用尖括号： GetMethod（GetElementObject，... 和 GetMethod（CastValue，

While Eugen Rieck is correct that names are mangled for generic types, they are not mangled for generic methods. Try without the angle brackets: GetMethod("GetElementObject", ... and GetMethod("CastValue",

这篇关于为什么当我尝试调用泛型方法时返回null？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！