通过类型动态设置泛型类中的静态字段

Question

I have a generic class and static field in it.

public class SomeGenericClass<T> : ISomeInterface<T> where T : SomeClass
{
    public static ISomeInterface<T> _someField;
}

And when I want to change value of this field, I have to change it for each type like this

var value = ...;
SomeGenericClass<Type1>._someField = value;
SomeGenericClass<Type2>._someField = value;
// ...
SomeGenericClass<Type3>._someField = value;

Is it possible to make it in loop, if I have array of types? I would like to see something like this

Type[] types = ... //Array of types
foreach(type in types){
    SomeGenericClass<type>._someField = value;
}

Or something like that.

Answer 1

You can do this by reflection. First get the actual type:

var type = typeof(SomeGenericClass<>).MakeGenericType(theTypeArgument);

Now you can call GetField on that type in order to get the field:

var field = type.GetField("_someField");

Next set the value. Notice that the first parameter passed to SetValue is null , because the field is static :

field.SetValue(null, value);

Finally wrap this into a loop, eg:

foreach(var t in types)
{
    var type = typeof(SomeGenericClass<>).MakeGenericType(t);
    var field = type.GetField("_someField");
    field.SetValue(null, value);
}

Of course you should also add some checks to avoid NullReferenceException .