c# - Expression.Body as MemberExpression returns null for primitive property -

i using code set value of property via reflection :

public static void set<t>(this t target, expression<func<t, object>> memberlamda, object value) {     var memberselectorexpression = memberlamda.body memberexpression;     if (memberselectorexpression != null)     {         var property = memberselectorexpression.member propertyinfo;         if (property != null)         {             property.setvalue(target, value, null);         }     } } 

but reason when :

myobject.set(x=>x.id, 1); 

where id of type int, can see memberselectorexpression null. have no issue properties of reference type.

i not familiar yet expression trees, doing wrong ?

the solution use following signature :

public static void set<t, tprop>(this t target, expression<func<t, tprop>> memberlamda,    tprop value) 

to make sure memberexpression correctly inferred. "object" generic constraint not specific enough.