Runtime generation of a lambda of member-expression

LambdaExpressionFactory.cs

public class LambdaExpressionFactory
{
    // With member type
    public static Expression<Func<T, TProperty>> Lambda<T, TProperty>(string memberName)
    {
        var parameterExpression = Expression.Parameter(typeof(T), "x");
        var memberExpression = Expression.PropertyOrField(parameterExpression, memberName);
        var result = (Expression<Func<T, TProperty>>)Expression.Lambda(memberExpression, parameterExpression);
        return result;
    } 

    // Without member type
    public static Expression<Func<T, object>> Lambda<T>(string memberName)
    {
        var parameterExpression = Expression.Parameter(typeof(T), "x");
        var memberExpression = Expression.PropertyOrField(parameterExpression, memberName);
        var unaryExpression = Expression.Convert(memberExpression, typeof(object));
        var result = (Expression<Func<T, object>>)Expression.Lambda(unaryExpression, parameterExpression);
        return result;
    }  
}