Compiler Error CS0445
Cannot modify the result of an unboxing conversion
The result of an unboxing conversion is a temporary variable. The compiler prevents you from modifying such variables because any modification would go away when the temporary variable goes away. To fix this, declare a new value-type variable to store the intermediate expression, and assign the result of the unboxing conversion to that variable.
The following code generates CS0455.
// CS0445.CS
class UnboxingTest
{
public static void Main()
{
Point p;
p.x = 1;
p.y = 2;
object obj = p;
// The following line generates CS0445, because the result
// of unboxing obj is a temporary variable.
((Point)obj).x = 2;
// The following lines resolve the error.
// Store the result of the unboxing conversion in p2.
Point p2;
p2 = (Point)obj;
// Then you can modify the unboxed value.
p2.x = 2;
}
}
struct Point
{
public int x, y;
}