Expression Tree Tutorial SubtractAssign
You can build an expression tree which contains a subtraction assignment operation using Expression.SubtractAssign method. For example, you have the following code.
int myInt; myInt = 12; myInt -= 5; Console.WriteLine(myInt);
Here is the code that is required to build the same functionality using expression tree.
ParameterExpression myIntVariableExpr = Expression.Variable(typeof(int), "myInt"); BlockExpression addAssignExpr = Expression.Block( new ParameterExpression[] { myIntVariableExpr }, Expression.Assign(myIntVariableExpr, Expression.Constant(12)), Expression.SubtractAssign( myIntVariableExpr, Expression.Constant(5) ) ); Console.WriteLine(Expression.Lambda<Func<int>>(addAssignExpr).Compile()());