Switch a Task<T> where T is an enum

Content Index :

Switch a Task<T> where T is an enum
Can I construct an enum of enums and have a method switch the internal enum based on a variable
Is there any significant reason to use the ordinal of an enum in a switch case, instead of using the enum?
Java forcing default return statement from method with enum switch with all enum values covered
Is it possible to give out a warning when switch (enum) does not cover every enum value AT COMPILE C#
Using attributes to cut down on enum to enum mapping and enum/const to action switch statments

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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Switch a Task<T> where T is an enum , Using attributes to cut down on enum to enum mapping and enum/const to action switch statments , Can I construct an enum of enums and have a method switch the internal enum based on a variable , Java forcing default return statement from method with enum switch ,

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();
        default:
            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 ...;
default:
     // here in case someone updates the enum and forgets to update this code
     return "Unknown type";

case ...:
     return ...;
default:
     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">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Roslyn.Analyzers" Version="1.0.3.4" PrivateAssets="All" />
  </ItemGroup>

</Project>

using System;

enum Color
{
    Red, Green, Blue
}

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

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