Using enum in ConverterParameter

Question

I am building an application that can be used by many users. Each user is classified to one of the next Authentication levels:

public enum AuthenticationEnum { User, Technitian, Administrator, Developer }

Some controls (such as buttons) are exposed only to certain levels of users. I have a property that holds the authentication level of the current user:

public AuthenticationEnum CurrentAuthenticationLevel { get; set; }

I want to bind this property to the 'Visibilty' property of some controls and pass a parameter to the Converter method, telling it what is the lowest authentication level that is able to see the control. For example:

<Button Visibility="{Binding Path=CurrentAuthenticationLevel, Converter={StaticResource AuthenticationToVisibility}, ConverterParameter="Administrator"}"/>

means that only 'Administrator' and 'Developer' can see the button. Unfortunately, the above code passes "Administrator" as a string. Of course I can use switch/case inside the converter method and convert the string to AuthenticationEnum. But this is ugly and prone to maintenance errors (each time the enum changes - the converter method would require a change also).

Is there a better way to pass a nontrivial object as a parameter?

See this for other formats and more details - stackoverflow.com/questions/359699/… — akjoshi
– akjoshi, Commented Jan 17, 2018 at 12:46

StayOnTarget · Accepted Answer · 2021-07-29 16:12:34Z

ArsenMkrt's answer is correct,

Another way of doing this is to use the x:Static syntax in the ConverterParameter

<Button ... Visibility="{Binding Path=CurrentAuthenticationLevel, Converter={StaticResource AuthenticationToVisibility}, ConverterParameter={x:Static local:AuthenticationEnum.Administrator}}"/>

And in the converter

public class AuthenticationToVisibility : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { AuthenticationEnum authenticationEnum = (AuthenticationEnum)parameter; //... } }

How can we do it in Windows Store Apps? Seems like x:Static is not recognizable by this project type.

Arsen Mkrtchyan · Accepted Answer · 2011-02-09 08:01:00Z

8

User

 (AuthenticationEnum)Enum.Parse(typeof(AuthenticationEnum),parameter)

to parse string as enumerator

answered Feb 9, 2011 at 8:01

Arsen Mkrtchyan

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1 Comment

linquize Over a year ago

Using enum value directly has better performance than parsing string every time?

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