c#根据字符串设置变量值

Question

I have a class with a list of variables (shortened to one "a" here) - I'm trying to create a way to populate a variable based on two string inputs, so I can just use, for instance:

SET_VAL("a", "value_for_a")

Which I'd like to get the MessageBox showing just "value_for_a"

but I'm tripping up trying to use reflection, I'm sure this is possible, I know it's possible to get a value from a variable using a string to find it's name, cos every time I search for this that's all I seem to get, but why doesn't the following work? The method SetValue is asking for objects as parameters when I just want to pass two strings?

public class MySystem_SubsNote
   {
       public string a;

       public void SET_VAL(string mytype, string myvalue)
       {
            this.GetType().GetField(mytype).SetValue(myvalue);
            MessageBox.Show(a);
       }
   }
    
         

Answer 1

As mentioned from Lasse in the comments SetValue expects two parameters, the first being the instance of which to set the value, the second the new value. So this should do it:

public void SET_VAL(string mytype, string myvalue)
{
    this.GetType().GetField(mytype).SetValue(this, myvalue);
    MessageBox.Show(a);
}