Question

foreach (var filter in filters)
{
    var filterType = typeof(Filters);
    var method = filterType.GetMethod(filter, BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.Static);
    if (method != null)
    {
        var parameters = method.GetParameters();
        Type paramType = parameters[0].ParameterType;
        value = (string)method.Invoke(null, new[] { value });
    }
}

如何将value投射到paramType？ value是string，paramType可能只是int，string或float等基本类型。如果不能进行转换，我很高兴抛出异常。

Answer 1

您使用的类型都是IConvertible。因此，您可以使用ChangeType。

 value = Convert.ChangeType(method.Invoke(null, new[] { value }), paramType);

Answer 2

你可以动态;例如：

using System;

namespace TypeCaster
{
    class Program
    {
        internal static void Main(string[] args)
        {
            Parent p = new Parent() { name = "I am the parent", type = "TypeCaster.ChildA" };
            dynamic a = Convert.ChangeType(new ChildA(p.name), Type.GetType(p.type));
            Console.WriteLine(a.Name);

            p.type = "TypeCaster.ChildB";
            dynamic b = Convert.ChangeType(new ChildB(p.name), Type.GetType(p.type));
            Console.WriteLine(b.Name);
        }
    }

    internal class Parent
    {
        internal string type { get; set; }
        internal string name { get; set; }

        internal Parent() { }
    }

    internal class ChildA : Parent
    {
        internal ChildA(string name)
        {
            base.name = name + " in A";
        }

        public string Name
        {
            get { return base.name; }
        }
    }

    internal class ChildB : Parent
    {
        internal ChildB(string name)
        {
            base.name = name + " in B";
        }

        public string Name
        {
            get { return base.name; }
        }
    }
}

将变量转换为仅在运行时已知的类型？

2 个答案: