Switch a Task<T> where T is an enum

Switch a Task<T> where T is an enum

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Switch a Task<T> where T is an enum
Tag : chash , By : TBG
Date : November 24 2020, 09:00 AM

wish help you to fix your issue I want to get a Task which is returned by a property. ,
Why must it be Task?
ProgressStatus statusAfterAdding = await msg.Add;
switch (statusAfterAdding)
    // ...

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Can I construct an enum of enums and have a method switch the internal enum based on a variable

Tag : java , By : Lior
Date : March 29 2020, 07:55 AM
With these it helps This is how I ended up solving the issue. Each parameter to the enum represents separate environments, and I just use getter methods to return the correct id per environment.
public enum EnvironmentIds {

USER_MANAGER_CHANGED("e29e902c","28a6e01c", "281916f6"),
USER_ADDED_TO_GROUP("5059020b", "f039fc37", "0e480029"),
USER_CREATED("d9bc6a0c", "f26f0a23", "9261f53a"),
USER_REMOVED_FROM_GROUP("fc30b97c", "15528295", "c08af3b2");

String holdingId;
String productionId;
String stagingId;

EnvironmentIds(String holdingId, String stagingId, String productionId) {
    this.holdingId = holdingId;
    this.stagingId = stagingId;
    this.productionId = productionId;

public String getId(String environment) {
    switch(environment) {
        case "holding":
            return getHoldingId();
        case "production":
            return getProductionId();
        case "staging":
            return getStagingId();
            return null;
public String getHoldingId() {return holdingId;}

public String getProductionId() {return productionId;}

public String getStagingId() {return stagingId;}

Is there any significant reason to use the ordinal of an enum in a switch case, instead of using the enum?

Tag : java , By : suresh
Date : March 29 2020, 07:55 AM
I wish did fix the issue. There's a good reason against it. The ordinals can change any time without breaking even binary compatibility. The names cannot so change at all.
A better solution would have been to build the returned values into the Enum itself.

Java forcing default return statement from method with enum switch with all enum values covered

Tag : java , By : Dennizzz
Date : March 29 2020, 07:55 AM
Hope that helps
Java forcing default return statement from method with enum switch with all enum values covered... What is the design decision behind such behaviour?
case ...:
     return ...;
     // here in case someone updates the enum and forgets to update this code
     return "Unknown type";
case ...:
     return ...;
     throw new IllegalStateException("unknown enum type found for" + mType);

Is it possible to give out a warning when switch (enum) does not cover every enum value AT COMPILE C#

Tag : chash , By : tanminivan
Date : March 29 2020, 07:55 AM
wish of those help No, it's not possible - at least not out of the box. Switch statements in C# do not have to be exhaustive, and there's no way to require them to be exhaustive.
(Switch expressions in C# 8 will give a warning if they're not exhaustive, but that probably doesn't help you right now.)
<Project Sdk="Microsoft.NET.Sdk">


    <PackageReference Include="Roslyn.Analyzers" Version="" PrivateAssets="All" />

using System;

enum Color
    Red, Green, Blue

sealed class Program
    static void Main(string[] args)
        Color c = Color.Red;

        switch (c)
            case Color.Red:
            case Color.Green:
//            case Color.Blue:
//                Console.WriteLine("Blue");
//                break;
                Console.WriteLine("Undefined color");

Using attributes to cut down on enum to enum mapping and enum/const to action switch statments

Tag : chash , By : nemof
Date : March 29 2020, 07:55 AM
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