enums

问题 I'm trying to implement an enum in a entity called CargoWrapper. In my android app I'm constructing a CargoWrapper object to send to an endpoint method, and then calling my CargoWrapper setters to set the instance varialbes. One of CargoWrappers instance variables is an enum and it's indexed. The only methods generated for my front end are the setter and getters, I can't see the enum. Does anyone know how to set the enum instance variable from a android client, seems like it should be very

问题 There's no particular reason I want to do this - I'm just wondering if it is possible. If it helps, here's a fictional situation in which it could be used: Imagine a type of Enum which is used as a read-only data source, such that each value of the Enum contains distinct content. The Enum implements Readable . Now, suppose we want a method that reads all values of the Enum into a single buffer. That could be implemented as a static utility method in a helper class (see below). public class

问题 I am using Spring Data and Repositories. I created an Entity with a enum type field, which I declared @Enumerated(EnumType.STRING), but I am forced to create a method getAuthority returning a String. @Entity @Configurable public class BaseAuthority implements GrantedAuthority { @Enumerated(EnumType.STRING) @Column(unique = true) private AuthorityType authority; @Override public String getAuthority() { return authority.toString(); } } The enum is as follow: public enum AuthorityType {

问题 I am using Spring Data and Repositories. I created an Entity with a enum type field, which I declared @Enumerated(EnumType.STRING), but I am forced to create a method getAuthority returning a String. @Entity @Configurable public class BaseAuthority implements GrantedAuthority { @Enumerated(EnumType.STRING) @Column(unique = true) private AuthorityType authority; @Override public String getAuthority() { return authority.toString(); } } The enum is as follow: public enum AuthorityType {

问题 I am new with C# and I have some troubles with enum. I have Enum defined like this: public enum CustomFields { [Display(Name = "first_name")] FirstName = 1, [Display(Name = "last_name")] LastName = 2, } What I need is code which will check does display name exist and if so return enum value. So if I have display name: var name = "first_name"; I need something like: var name = "first_name"; CustomFields.getEnumValue(name); This should return: CustomFields.FirstName; 回答1: You could use generics

问题 What does this not work? enum Aspect : CGFloat { case Clockwise = 1.0 case Anticlockwise = -1.0 } On Anticlockwise line I'm told that 'raw value for enum case must be a literal' 回答1: That sounds like a bug. However it seems to work if you omit the decimal part: enum Aspect : CGFloat { case Clockwise = 1 case Anticlockwise = -1 } 回答2: The weird thing is that a float with a minus is not a literal, but an expression. So the error message is correct. From the Swift programming language: Unlike

问题 Suppose there's an enum like so. [Flags] public enum Crazies { One = 2, Two = 3, Three = 4 } Now, when I force the different values to be stringified, I get the text in the beautiful tongue, which differ considerably from the usual meaning of the numerics. Suppose now that the users prefer a more conventional definition of the natural numbers and wish to see the text " Two ", although the variable value is One (NB it's Crazies.One ). What'd be the simplest way to map the stringification of

问题 Suppose there's an enum like so. [Flags] public enum Crazies { One = 2, Two = 3, Three = 4 } Now, when I force the different values to be stringified, I get the text in the beautiful tongue, which differ considerably from the usual meaning of the numerics. Suppose now that the users prefer a more conventional definition of the natural numbers and wish to see the text " Two ", although the variable value is One (NB it's Crazies.One ). What'd be the simplest way to map the stringification of

问题 I have been using this editor template for enums: @model Enum @{ var htmlAttributesFromView = ViewData["htmlAttributes"] ?? new { }; var htmlAttributes = Html.MergeHtmlAttributes(htmlAttributesFromView, new { @class = "form-control" }); } <div class="form-group"> @Html.LabelFor(model => model, htmlAttributes: new { @class = "control-label col-md-3" }) <div class="col-md-8"> @Html.EnumDropDownListFor(x => x, htmlAttributes) @Html.ValidationMessageFor(model => model) </div> <a class=

问题 I have been using this editor template for enums: @model Enum @{ var htmlAttributesFromView = ViewData["htmlAttributes"] ?? new { }; var htmlAttributes = Html.MergeHtmlAttributes(htmlAttributesFromView, new { @class = "form-control" }); } <div class="form-group"> @Html.LabelFor(model => model, htmlAttributes: new { @class = "control-label col-md-3" }) <div class="col-md-8"> @Html.EnumDropDownListFor(x => x, htmlAttributes) @Html.ValidationMessageFor(model => model) </div> <a class=