CODEWITHSUNDEEP
c#reflection
Tarscher
Tarscher

Reputation: 1933

get attribute information

My UI is build with lots of user controls that are translatable. Some controls in the usercontrols shouldn't be translated and I want to tag them as such with a [DoNotTranslate]` custom attribute.

in my userControl.designer.cs file 

    [DoNotTranslate] 
    private DevExpress.XtraEditors.LabelControl maxLabel;

    [DoNotTranslate]
    private DevExpress.XtraEditors.LabelControl valueLabel;

    //all other controls

The translation function expects a (user)control and then goes through all the child control.Controls to make sure all controls are translated without the need to call the translation function on every single control.

Is it possible to find out if a control has my custom attribute set? The problem is that I don't see how I can get the attribute information in the translation function when i go through all the Controls.

Any advice is greatly appreciated,

Thanks

Upvotes: 0

Views: 373

Answers (2)

Paolo Falabella
Paolo Falabella

Reputation: 25844

EDIT: I see now from the code you posted that the attribute is on a property of the control, not on the class defining the control itself. You can try like this:

public IEnumerable<PropertyInfo> GetNonTranslatableProperties(WebControl control)
{
    foreach (PropertyInfo property in control.GetType().GetProperties())
    {
        if(
        property
        .GetCustomAttributes(true)
        .Count(item => item is DoNotTranslateAttribute) > 0)
            yield return property;
    }        
}

otherwise, you can subclass Label to a NonTranslatableLabel, apply the attribute to the class and use it instead of Label in your "father" control.

[NonTranslatable]
public class NonTranslatableLabel : Label

===================

for each of your controls you can do:

myCustomControl.GetType()
 .GetCustomAttributes(true)
 .Where(item => item is DoNotTranslateAttribute);

for instance you could enumerate all your "non-translatable" controls like this:

public IEnumerable<Control> GetNonTranslatableChildren(Control control)
{
    foreach(Control c in control.Controls) 
    {
        if(
        c.GetType()
        .GetCustomAttributes(true)
        .Count(item => item is DoNotTranslateAttribute) > 0)
            yield return c;
    }        
}

Upvotes: 2

VinayC
VinayC

Reputation: 49195

You can use GetCustomAttributes method to find out if the attribute has been applied or not. For example,

static readonly Type _DoNotTranslateAttribute = typeof(DoNotTranslate);

.... // other code

var t = control.GetType();
if (t.GetCustomAttributes(_DoNotTranslateAttribute, false).length > 0)
{
   // do not translate
}

(disclaimer: untested/uncompiled code- just to give an idea how to use the function)

Upvotes: 1

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