Assign Property value using Reflection

[Andrew Robinson]

assuming that I have a class

public class MyClass {
public string FirstName {
get {...}
set {...}
}
}

how can I assign the FirstName property using reflection on a generic class
of type MyClass?

string propertyName = "FirstName";
C is a gerneric type of type "MyClass"

so what I want to do is:
C.propertyName = "Andrew"; // <-pseudo code...

For the simplicity, lets assume that the property is always of type string
but it could very (an I will know the type ahead of time.)

Thanks,

 

[allfyre]

Check out the System.Reflection.PropertyInfo object.

 

[Andrew Robinson]

Thanks for the push in the right direction:

D d = new D();



foreach (Map map in mapList)

{

PropertyInfo property = typeof(D).GetProperty(map.PropertyName);



if (!property.CanWrite)

{

string message = "Unable to set property {0} of type {1}";

throw new InvalidOperationException(string.Format(message,
map.PropertyName, typeof(D).Name));

}



property.SetValue(d, dr[map.ColumnName], null);

}

 

[Jeffrey Tan[MSFT]]

Hi Andrew ,

I am glad you found the solution yourself. Actually, all the Reflection
related classes are stored in System.Reflection namespace, so you may check
the class names under this namespace for what you want. Normally, you may
search the class name with "property" included.

If you need further help, please feel free to post. Thanks.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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[Guest]

Jeffrey,

I wonder if you could help me with something similar (I've not managed to
find the info in the online dox!).

I need to add to a collection using reflection, specifically
combo.Items.Add(myValue) where combo could be a DropDownList,
ToolStripComboBox, ComboBox, DataGridViewComboBox etc.

I've got as far as :

Dim prp as PropertyInfo = combo.GetProperty("Items")
For Each s as String in strings
--> pseudo code <-- prp.Add(s)
Next

Many thanks

 

[Marc Gravell]

Most (if not all) of these .Items properties will implement IList; hence,
the easiest option is:

IList items = (IList) obj.GetType().GetProperty("Items").GetValue(obj,
null);
foreach(string s in strings) {
items.Add(s);
}

Note that the Items property is rarely settable, but that
PropertyInfo.SetValue does this job when it can...

Marc

 

[Guest]

Marc,

Thanks very much

I'll try it out.

Regards
Jeremy