C# dynamically set property [duplicate]

Question

Possible Duplicate:
.Net - Reflection set object property
Setting a property by reflection with a string value

I have an object with multiple properties. Let's call the object objName. I'm trying to create a method that simply updates the object with the new property values.

I want to be able to do the following in a method:

private void SetObjectProperty(string propertyName, string value, ref object objName)
{
    //some processing on the rest of the code to make sure we actually want to set this value.
    objName.propertyName = value
}

and finally, the call:

SetObjectProperty("nameOfProperty", textBoxValue.Text, ref objName);

Hope the question is fleshed out enough. Let me know if you need more details.

Thanks for the answers all!

@DavidArcher there is no rel keyboard in C#...I take it you mean ref? There is no need to pass an object as ref unless you intend on changing the actual instance of it. — James
– James, Commented Oct 19, 2012 at 8:55
Indeed, I did mean ref, and yes, I do intend on changing the actual instance. — David Archer
– David Archer, Commented Oct 19, 2012 at 9:00

josejuan · Accepted Answer · 2012-10-19 08:41:15Z

90

objName.GetType().GetProperty("nameOfProperty").SetValue(objName, objValue, null)

answered Oct 19, 2012 at 8:41

josejuan

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4 Comments

Anonymous Over a year ago

You should use propertyName inside GetProperty().

James Over a year ago

And what if "nameOfProperty" doesn't exist?

josejuan Over a year ago

Exception of course, you can use GetProperties to test.

Ananda Over a year ago

I was able to replace my 200 line code with 5 lines using your code sample. Thanks, you saved my day.

James · Accepted Answer · 2012-10-19 08:44:29Z

47

You can use Reflection to do this e.g.

private void SetObjectProperty(string propertyName, string value, object obj)
{
    PropertyInfo propertyInfo = obj.GetType().GetProperty(propertyName);
    // make sure object has the property we are after
    if (propertyInfo != null)
    {
        propertyInfo.SetValue(obj, value, null);
    }
}

edited Oct 19, 2012 at 8:44

answered Oct 19, 2012 at 8:38

James

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3 Comments

Chason Arthur Over a year ago

Props for checking for null before calling.

fdelia Over a year ago

I usually also check for "can write": if (propertyInfo != null && propertyInfo.CanWrite).

toha Over a year ago

How if I want to set static property Sir?

Ekk · Accepted Answer · 2012-10-19 08:43:12Z

4

You can use Type.InvokeMember to do this.

private void SetObjectProperty(string propertyName, string value, rel objName) 
{ 
    objName.GetType().InvokeMember(propertyName, 
        BindingFlags.Instance | BindingFlags.Public | BindingFlags.SetProperty, 
        Type.DefaultBinder, objName, value); 
}

answered Oct 19, 2012 at 8:43

Ekk

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Comments

Adam · Accepted Answer · 2019-10-26 05:18:03Z

4

Get the property info first, and then set the value on the property:

PropertyInfo propertyInfo = objName.GetType().GetProperty(propertyName);
propertyInfo.SetValue(objName, value, null);

edited Oct 26, 2019 at 5:18

Adam

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answered Oct 19, 2012 at 8:41

harriyott

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Comments

Sean · Accepted Answer · 2012-10-19 08:44:43Z

2

You can do it via reflection:

void SetObjectProperty(object theObject, string propertyName, object value)
{
  Type type=theObject.GetType();
  var property=type.GetProperty(propertyName);
  var setter=property.SetMethod();
  setter.Invoke(theObject, new ojbject[]{value});
}

NOTE: Error handling intentionally left out for the sake of readability.

answered Oct 19, 2012 at 8:44

Sean

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