我想使用反射并使用反射进行隐式或显式覆盖。
鉴于我已经这样定义了 Foo
public class Foo
{
public static explicit operator decimal(Foo foo)
{
return foo.Value;
}
public static explicit operator Foo(decimal number)
{
return new Foo(number);
}
public Foo() { }
public Foo(decimal number)
{
Value = number;
}
public decimal Value { get; set; }
public override string ToString()
{
return Value.ToString();
}
}
当我运行这段代码时
decimal someNumber = 42.42m;
var test = (Foo)someNumber;
Console.WriteLine(test); // Writes 42.42 No problems
当我尝试定义一个以 Foo 作为成员类型的类并使用反射来设置它时。我得到以下异常。
Error : Object of type 'System.Decimal' cannot be converted to type 'Foo'.
StackTrace: at System.RuntimeType.TryChangeType(Object value, Binder binder, CultureInfo culture, Boolean needsSpecialCast)
at System.RuntimeType.CheckValue(Object value, Binder binder, CultureInfo culture, BindingFlags invokeAttr)
at System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder binder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, BindingFlags invokeAttr, Binder binder, Object[] index, CultureInfo culture)
at System.Reflection.RuntimePropertyInfo.SetValue(Object obj, Object value, Object[] index)
这是我用反射设置属性的代码
public class FooComposite
{
public Foo Bar { get; set; }
}
var properties = typeof(FooComposite).GetProperties();
var testFoo = new FooComposite();
foreach(var propertyInfo in properties)
{
propertyInfo.SetValue(testFoo, 17.17m, null); // Exception generated on this line
}
Console.WriteLine(testFoo.Bar); // Never gets here
我怎样才能进行这种转换?
最佳答案
嗯,它与非反射代码没有什么不同,您仍然需要将数字显式转换为 Foo
:
propertyInfo.SetValue(testFoo,(Foo)17.17m, null);
实例:http://rextester.com/rundotnet?code=BPQ74480
出于兴趣,我尝试了一些替代方案。
关于c# - 如何从反射执行显式操作转换?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7351289/