Compiler Error CS0445
Visual Studio 2012
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; }
