How to use Expression.Constant(object value, Type type)?

Question

I have a problem with using the ConstantExpression class:

Expression exp = Expression.Constant("1", typeof(Int32));

When executing the code from above, the following error is thrown.

Parameter type mismatch

How can I use the Constant(object value, Type type) method?

Answer 1

您传递了一个字符串，表示1 ，而只是使用没有双引号的数字：

Expression exp = Expression.Constant(1, typeof(Int32));