Set property Nullable<> by reflection

Question

I try to set a Nullable<> property dynamicly.

I Get my property ex :

PropertyInfo property = class.GetProperty(\"PropertyName\"); // My property i         


        

Answer 1

If you want to convert an arbitrary string to the underlying type of the Nullable, you can use the Convert class:

var propertyInfo = typeof(Foo).GetProperty("Bar");
object convertedValue = null;
try 
{ 
    convertedValue = System.Convert.ChangeType("1256", 
        Nullable.GetUnderlyingType(propertyInfo.PropertyType));
} 
catch (InvalidCastException)
{
    // the input string could not be converted to the target type - abort
    return;
}
propertyInfo.SetValue(fooInstance, convertedValue, null);

This example will work if the target type is int, short, long (or unsigned variants, since the input string represents a non-negative number), double, float, or decimal. Caveat: this is not fast code.