Question

I want to use type returned by PropertyType to create a typed function. I found this similiar
using type returned by Type.GetType() in c#
but this mentions how to create a list but does not mention how we can create a Func<>. Please help me out.

Pseudocode:

PropertyInfo inf = typeof(SomeClass).GetProperty("PropertyName");
Type T=inf.PropertyType;
Expression<Func<SomeClass,T>> le = GetPropertyOrFieldByName<SomeClass,T>("PropertyName");

static Expression<Func<TSource, TResult>> GetPropertyOrFieldByName<TSource,TResult>(string propertyOrFieldName)
{ 
ParameterExpression item = Expression.Parameter(typeof(TSource), "expr");MemberExpression prop = LambdaExpression.PropertyOrField(item, propertyOrFieldName);
var expr = Expression.Lambda<Func<TSource, TResult>>(prop, new ParameterExpression[] { item });
expr.Compile();
return expr;
}

Answer 1

If you want to call the GetPropertyOrFieldByName with the PropertyType, this should work:

PropertyInfo inf = typeof(SomeClass).GetProperty("PropertyName");
Type T = inf.PropertyType;

object le =
    typeof([TypeThatDeclaresMethod]).GetMethod("GetPropertyOrFieldByName")
    .MakeGenericMethod(typeof(SomeClass), T)
    .Invoke(null, new object[] { "PropertyName" });

Assuming that the GetPropertyOrFieldByName method is a public static method.