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问题 This question already has answers here : Create instance of unknown Enum with string value using reflection in C# (2 answers) Closed 24 days ago . What I have is a string variable that is the name of a enum. I have the integer of the enum. How would I convert that into instance of the enum itself? Enum TestEnum { One = 1, Two = 2, Three = 3 } string str = "TestEnum"; int intValue = 2; I see many posts that require you to have an instance of the enum to get it's like this highly upvoted answer

问题 I'm sure there must be a much better way of doing this. I'm trying to do a count operation on a Flags enum. Before I was itterating over all the possible values and counting the succesful AND operations. e.g. [Flags] public enum Skills { None = 0, Skill1 = 1, Skill2 = 2, Skill3 = 4, Skill4 = 8, Skill5 = 16, Skill6 = 32, Skill7 = 64, Skill8 = 128 } public static int Count(Skills skillsToCount) { Skills skill; for (int i = 0; i < SkillSet.AllSkills.Count; i++) { skill = SkillSet.AllSkills[i];

问题 I'm sure there must be a much better way of doing this. I'm trying to do a count operation on a Flags enum. Before I was itterating over all the possible values and counting the succesful AND operations. e.g. [Flags] public enum Skills { None = 0, Skill1 = 1, Skill2 = 2, Skill3 = 4, Skill4 = 8, Skill5 = 16, Skill6 = 32, Skill7 = 64, Skill8 = 128 } public static int Count(Skills skillsToCount) { Skills skill; for (int i = 0; i < SkillSet.AllSkills.Count; i++) { skill = SkillSet.AllSkills[i];

问题 This question already has answers here : How do I put docstrings on Enums? (2 answers) Closed 2 years ago . I understand that I can add a Python docstring to an enum type as I would any other class. But how do I add documentation to an element of that type? As far as I can see there are three possibilities: class MyEnum(Enum): """ This is my enum type. """ """ Variant 1 """ a = 0, b = 1, # variant 2 c = 2, """ variant 3 """ But none of them really work consistently. If I call print(inspect

问题 I really can't find a nice enum JDBC mapping example. Is enum actually supported by JDBC? I am working with MySQL. I have an enum column, and would like to map to some Java enum. 回答1: JDBC does not support enums. You can convert a string to an enum though, so if you have a Java enum you can do something like MyEnum enumVal = MyEnum.valueOf(rs.getString("EnumColumn")); You'll have to keep your java enum and mysql enum in sync though. MyEnum.valueOf() can throw IllegalArgumentException if there

问题 General question regarding swift enum. I want to create an enum of "icon" and "associate" a value to the enum case enum Icon { case plane case arrow case logo case flag } I want to create an associated image to the enum's value. And also an associated color to the enum value So for instance if it was possible to do something like: extension Icon.plane { var image = { get { return UIImage("plane.png") } } var color = { get { return UIColor.greenColor() } } } var image = Icon.arrow.image // the

问题 Laravel has a <select> form helper which takes as input a dictionary. I like to keep the values for all of these in a central place. For example, I might have an enum that looks like this: $phoneTypes = [ 'CELL' => "Cellular", 'HOME' => "Home", 'WORK' => "Work", ]; Which I want to use in both my view/template, and in the database: Schema::create('customers', function (Blueprint $table) { $table->increments('id'); $table->enum('pri_phone_type',array_keys($phoneTypes)); ... }); Is there a

问题 Is there a way to use new Swift3 enums with associated value in Objective-C? Is there a way to declare/bridge Swift3 enums with associated value in Objective-C, if I develop a library and want to give Swift3 users convenient API? 回答1: I'm afraid it's not possible, Apple has a list of Swift Type Compatibility which explicitly excludes enumerations defined in Swift without Int raw value type. Reference 回答2: This is what I did: In Swift class created the enum enum Origin { case Search(searchTerm

问题 Suppose we have an enum that looks like this: enum MyEnum { Field1, Field2 {x: f64, y: f64}, /* Maybe some other fields */ MyString(String), } Now I created an instance of this enum of the subtype MyString and after some actions I want to mutate it. For example: fn main() { let mut my_enum = MyEnum::MyString("Hello, world".to_string()); /* Some actions */ // Mutating the string match my_enum { MyEnum::MyString(ref mut content) => { content.push('!'); }, _ => {} } // Printing the string match

问题 Suppose we have an enum that looks like this: enum MyEnum { Field1, Field2 {x: f64, y: f64}, /* Maybe some other fields */ MyString(String), } Now I created an instance of this enum of the subtype MyString and after some actions I want to mutate it. For example: fn main() { let mut my_enum = MyEnum::MyString("Hello, world".to_string()); /* Some actions */ // Mutating the string match my_enum { MyEnum::MyString(ref mut content) => { content.push('!'); }, _ => {} } // Printing the string match