Question

I’m trying to reflect over some class properties and set them programmatically, but it looks like one of my PropertyInfo filters isn’t working:

//Get all public or private non-static properties declared in this class (no inherited properties) - that have a getter and setter.
PropertyInfo[] props = this.GetType().GetProperties(BindingFlags.DeclaredOnly | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.GetProperty | BindingFlags.SetProperty );

I’m getting an error on the line

pi.SetValue(this, valueFromData, null);

Because the property has only a get{} method, no set{} method.

My question is, why wasn’t this property filtered out of props? I thought that was the purpose of BindingFlags.SetProperty.

The property not getting filtered out is:

    public String CollTypeDescription
    {
        get { return _CollTypeDescription; }
    }

Note that I want to filter properties that won’t work ahead of time because I’m listing them all at once. I don’t want to use pi.GetSetMethod() after the fact to determine whether I can use the setter.

Answer 1

From the documentation:

BindingFlags.SetProperty

Specifies that the value of the specified property should be set. For
COM properties, specifying this binding flag is equivalent to
specifying PutDispProperty and PutRefDispProperty.

BindingFlags.SetProperty and BindingFlags.GetProperty do not filter properties that are missing setters or getters, respectively.

To check if a property can be set, use the CanWrite property.

if (pi.CanWrite)
    pi.SetValue(this, valueFromData, null);