检查属性是否为只读

Question

I have this code using reflection and I decided to replace it by FastMember.

This is my code:

var VehicleType = TypeAccessor.Create(res.GetType());
var vehicleFastMember = ObjectAccessor.Create(res);

foreach (var kvp in dictionary)
{
    if (kvp.Key == "Identifier") continue;
    object value = kvp.Value;

    if (VehicleType.GetMembers().FirstOrDefault(prop => prop.Name == kvp.Key) != null)
    {
        // here inside if i want to check whether property is not readonly, 
        // I am afraid of runtime exception that readonly cannot be overwritten.
        **if (vehicleFastMember[kvp.Key].)**
        {
            vehicleFastMember[kvp.Key] = kvp.Value;
        }                        
    }
}

By reflection:

That row with stars would be solved by this line:

if (property?.CanWrite ?? false)

Does FastMember offer some elegant solution too?

Answer 1

According to the source code of fast-member's MemberSet.Member, CanRead/CanWrite are calling the same methods you are trying to call (PropertyInfo.Can[Read/Write]).

It's also worth noting that instead of determining if the property is writable, you could simply wrap the assignment into a try/catch, and catch the ReadOnlyException that would emerge and continue with the loop.