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()());

Try it online