get the value of DisplayName attribute

Question

public class Class1        DisplayName  Something To Name        public virtual string Name   get  set        How to get the value of DisplayName attribute in C

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You need to get the PropertyInfo associated with the property  e g  via typeof Class1  GetProperty  Name    and then call GetCustomAttributes   It s a bit messy due to returning multiple values - you may well want to write a helper method to do this if you need it from a few places   There may already be a helper method in the framework somewhere  but if there is I m unaware of it    EDIT  As leppie pointed out  there is such a method  Attribute GetCustomAttribute MemberInfo  Type

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If anyone is interested in getting the localized string from the property with DisplayAttribute and ResourceType like this     Display Name    Year   ResourceType   typeof ArrivalsResource    public int Year   get  set      Use the following after displayAttribute    null  as shown above by  alex  answer    ResourceManager resourceManager   new ResourceManager displayAttribute ResourceType   var entry   resourceManager GetResourceSet Thread CurrentThread CurrentUICulture  true  true                              OfType lt DictionaryEntry gt                                FirstOrDefault p   gt  p Key ToString      displayAttribute Name    return entry Value ToString

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Following Rich Tebb s and Matt Baker s answer  I wanted to use the ReflectionExtensions methods in a LINQ query  but it didn t work  so I ve made this method for it to work   If DisplayNameAttribute is set the method will return it  otherwise it will return the MemberInfo name   Test method       static void Main string   args        var lst   new List lt Test gt         lst Add new Test  coucou1    kiki1         lst Add new Test  coucou2    kiki2         lst Add new Test  coucou3    kiki3         lst Add new Test  coucou4    kiki4         lst ForEach i   gt           Console WriteLine i GetAttributeName lt Test gt  t   gt  t Name          i GetAttributeName lt Test gt  t  gt t t2         Test method output     The class with DisplayName1 Attribute   public class Test       public Test           public Test string name  string T2                Name   name          t2   T2             DisplayName  toto        public string Name   get  set        public string t2   get  set        And the extension method   public static string GetAttributeName lt T gt  this T itm  Expression lt Func lt T  object gt  gt  propertyExpression        var memberInfo   GetPropertyInformation propertyExpression Body       if  memberInfo    null                throw new ArgumentException               No property reference expression was found                 propertyExpression               var pi   typeof T  GetProperty memberInfo Name       var ret   pi GetCustomAttributes typeof DisplayNameAttribute   true  Cast lt DisplayNameAttribute gt    SingleOrDefault        return ret    null   ret DisplayName   pi Name

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Assuming property as PropertyInfo type  you can do this in one single line   property GetCustomAttributes typeof DisplayNameAttribute   true  Cast lt DisplayNameAttribute gt    Single   DisplayName

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If instead       DisplayName  Something To Name      you use       Display Name    Something To Name      Just do this    private string GetDisplayName Class1 class1        string displayName   string Empty       string propertyName   class1 Name GetType   Name       CustomAttributeData displayAttribute   class1 GetType   GetProperty propertyName  CustomAttributes FirstOrDefault x   gt  x AttributeType Name     DisplayAttribute         if  displayAttribute    null                displayName   displayAttribute NamedArguments FirstOrDefault   TypedValue Value             return displayName

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Nice classes by Rich Tebb  I ve been using DisplayAttribute and the code did not work for me  The only thing I ve added is handling of DisplayAttribute  Brief search yielded that this attribute is new to MVC3  amp   Net 4 and does almost the same thing plus more  Here s a modified version of the method    public static string GetPropertyDisplayString lt T gt  Expression lt Func lt T  object gt  gt  propertyExpression                var memberInfo   GetPropertyInformation propertyExpression Body           if  memberInfo    null                        throw new ArgumentException                   No property reference expression was found                     propertyExpression                       var displayAttribute   memberInfo GetAttribute lt DisplayAttribute gt  false            if  displayAttribute    null                        return displayAttribute Name                    else                       var displayNameAttribute   memberInfo GetAttribute lt DisplayNameAttribute gt  false               if  displayNameAttribute    null                                return displayNameAttribute DisplayName                            else                               return memberInfo Name

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Please try below code  I think this will solve your problem   var classObj   new Class1    classObj Name   gt   StackOverflow    var property   new Class1   GetType   GetProperty nameof classObj Name    var displayNameAttributeValue    property    throw new InvalidOperationException         GetCustomAttributes typeof DisplayNameAttribute   as DisplayNameAttribute    if  displayNameAttributeValue    null       Console WriteLine   0     1    displayNameAttributeValue  classObj Name

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Try this code   EnumEntity item GetType   GetFields    int EnumEntity item  CustomAttributes ToArray   0  NamedArguments 0  TypedValue ToString     It will give you the value of data attribute Name

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var propInfo   typeof Class1  GetProperty  Name    var displayNameAttribute   propInfo GetCustomAttributes typeof DisplayNameAttribute   false   var displayName    displayNameAttribute 0  as DisplayNameAttribute  DisplayName    displayName variable now holds the property s value

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PropertyDescriptorCollection properties   TypeDescriptor GetProperties foo    foreach  PropertyDescriptor property in properties        if  property Name     Name                 Console WriteLine property DisplayName      Something To Name           where foo is an instance of Class1

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Try these utility methods of mine   using System ComponentModel  using System Globalization  using System Linq    public static T GetAttribute lt T gt  this MemberInfo member  bool isRequired      where T   Attribute       var attribute   member GetCustomAttributes typeof T   false  SingleOrDefault         if  attribute    null  amp  amp  isRequired                throw new ArgumentException              string Format                  CultureInfo InvariantCulture                    The  0  attribute must be defined on member  1                     typeof T  Name                   member Name               return  T attribute     public static string GetPropertyDisplayName lt T gt  Expression lt Func lt T  object gt  gt  propertyExpression        var memberInfo   GetPropertyInformation propertyExpression Body       if  memberInfo    null                throw new ArgumentException               No property reference expression was found                 propertyExpression               var attr   memberInfo GetAttribute lt DisplayNameAttribute gt  false       if  attr    null                return memberInfo Name             return attr DisplayName     public static MemberInfo GetPropertyInformation Expression propertyExpression        Debug Assert propertyExpression    null   propertyExpression    null        MemberExpression memberExpr   propertyExpression as MemberExpression      if  memberExpr    null                UnaryExpression unaryExpr   propertyExpression as UnaryExpression          if  unaryExpr    null  amp  amp  unaryExpr NodeType    ExpressionType Convert                        memberExpr   unaryExpr Operand as MemberExpression                       if  memberExpr    null  amp  amp  memberExpr Member MemberType    MemberTypes Property                return memberExpr Member             return null      Usage would be   string displayName   ReflectionExtensions GetPropertyDisplayName lt SomeClass gt  i   gt  i SomeProperty

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I have this generic utility method  I pass in a list of a given type  Assuming you have a supporting class  and it generates a datatable with the properties as column headers and the list items as data   Just like in standard MVC  if you dont have DisplayName attribute defined  it will fall back to the property name so you only have to include DisplayName where it is different to the property name       public DataTable BuildDataTable lt T gt  IList lt T gt  data                  Get properties         PropertyInfo   Props   typeof T  GetProperties BindingFlags Public   BindingFlags Instance              Where p   gt   p GetGetMethod   IsVirtual  amp  amp   p GetGetMethod   IsFinal  ToArray      Hides virtual properties            Get column headers         bool isDisplayNameAttributeDefined   false          string   headers   new string Props Length           int colCount   0          foreach  PropertyInfo prop in Props                        isDisplayNameAttributeDefined   Attribute IsDefined prop  typeof DisplayNameAttribute                 if  isDisplayNameAttributeDefined                                DisplayNameAttribute dna    DisplayNameAttribute Attribute GetCustomAttribute prop  typeof DisplayNameAttribute                    if  dna    null                      headers colCount    dna DisplayName                            else                 headers colCount    prop Name               colCount                isDisplayNameAttributeDefined   false                     DataTable dataTable   new DataTable typeof T  Name              Add column headers to datatable         foreach  var header in headers              dataTable Columns Add header            dataTable Rows Add headers              Add datalist to datatable         foreach  T item in data                        object   values   new object Props Length               for  int col   0  col  lt  Props Length  col                    values col    Props col  GetValue item  null                dataTable Rows Add values                      return dataTable          If there s a more efficient   safer way of doing this  I d appreicate any feedback  The commented   Where clause will filter out virtual properties  Useful if you are using model classes directly as EF puts in  Navigation  properties as virtual  However it will also filter out any of your own virtual properties if you choose to extend such classes  For this reason  I prefer to make a ViewModel and decorate it with only the needed properties and display name attributes as required  then make a list of them   Hope this helps

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From within a view that has Class1 as it s strongly typed view model   ModelMetadata FromLambdaExpression lt Class1  string gt  x   gt  x Name  ViewData  DisplayName

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First off  you need to get a MemberInfo object that represents that property  You will need to do some form of reflection   MemberInfo property   typeof Class1  GetProperty  Name       I m using  old-style  reflection  but you can also use an expression tree if you have access to the type at compile-time   Then you can fetch the attribute and obtain the value of the DisplayName property   var attribute   property GetCustomAttributes typeof DisplayNameAttribute   true         Cast lt DisplayNameAttribute gt    Single    string displayName   attribute DisplayName       parentheses are required typo error

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Late to the party I know   I use this   public static string GetPropertyDisplayName PropertyInfo pi      var dp   pi GetCustomAttributes typeof DisplayNameAttribute   true  Cast lt DisplayNameAttribute gt    SingleOrDefault      return dp    null   dp DisplayName   pi Name      Hope this helps

[c#] get the value of DisplayName attribute

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