我已经通过以下代码。在这里,我无法在运行时获取/设置变量的值。变量值已通过控制台获取。
using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
namespace ReflectionTest
{
class Addition
{
public int a = 5, b = 10, c = 20;
public Addition(int a)
{
Console.WriteLine("Constructor called, a={0}", a);
}
public Addition()
{
Console.WriteLine("Hello");
}
protected Addition(string str)
{
Console.WriteLine("Hello");
}
}
class Test
{
static void Main()
{
//changing variable value during run time
Addition add = new Addition();
Console.WriteLine("a + b + c = " + (add.a + add.b + add.c));
Console.WriteLine("Please enter the name of the variable that you wish to change:");
string varName = Console.ReadLine();
Type t = typeof(Addition);
FieldInfo fieldInfo = t.GetField(varName ,BindingFlags.Public);
if (fieldInfo != null)
{
Console.WriteLine("The current value of " + fieldInfo.Name + " is " + fieldInfo.GetValue(add) + ". You may enter a new value now:");
string newValue = Console.ReadLine();
int newInt;
if (int.TryParse(newValue, out newInt))
{
fieldInfo.SetValue(add, newInt);
Console.WriteLine("a + b + c = " + (add.a + add.b + add.c));
}
Console.ReadKey();
}
}
}
}
提前致谢..
答案 0 :(得分:1)
您的类中的字段是特定于实例的并且是公共的,但您使用的是中午公共绑定标志而不是公共绑定标志,而不是应用实例绑定标志(使用|用于按位或)。
答案 1 :(得分:1)
有很多问题。
首先,你正在通过BindingFlags.NonPublic
。这不行。您需要像这样传递BindingFlags.Public
和BindingsFlags.Instance
:
t.GetField(varName, BindingFlags.Public | BindingFlags.Instance);
或者,根本不要这样做:
t.GetField(varName);
您可以根本不传递任何内容,因为GetField
的实现是这样的:
return this.GetField(name, BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public);
所以它适合你。
此外,您需要将Addition
的实例传递给GetValue
和SetValue
,如下所示:
Console.WriteLine("The current value of " +
fieldInfo.Name +
" is " +
fieldInfo.GetValue(add) + ". You may enter a new value now:");
// ^^^ This
.. ..和
fieldInfo.SetValue(add, newInt);
// ^^^ This