Migrate to Dotnet 6

Microsoft.Azure.Devices.Edge.sln

@@ -193,14 +193,6 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Azure.Devices.Edg
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Azure.Devices.Routing.Core.Test", "edge-hub\core\test\Microsoft.Azure.Devices.Routing.Core.Test\Microsoft.Azure.Devices.Routing.Core.Test.csproj", "{5D0F6FB0-8716-4247-A5BE-92DA5B9E2189}"
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "edge-modules", "edge-modules", "{43E10CBA-2F64-4B4C-A5A5-B9E332DC98A1}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "functions", "functions", "{059BC610-4D1E-4A4D-9099-E67DF47D7DB7}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "samples", "samples", "{4F3B7488-3547-4EEB-A79E-9737182960AB}"
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "EdgeHubTriggerCSharp", "edge-modules\functions\samples\EdgeHubTrigger-Csharp\EdgeHubTriggerCSharp.csproj", "{9F5BD0E2-E73D-434A-8568-0C117A0716C9}"
-EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "NumberLogger", "test\modules\NumberLogger\NumberLogger.csproj", "{B0151FFD-85C4-42B9-81CC-9193BADFE9F8}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "jsoncanonicalizer", "edge-util\src\jsoncanonicalizer\jsoncanonicalizer.csproj", "{1915CE7E-E949-4633-9862-D92BD5E873B5}"
@@ -211,6 +203,14 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ManifestSignerClient", "sam
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "IotedgeDiagnosticsDotnet", "edge-modules\iotedge-diagnostics-dotnet\IotedgeDiagnosticsDotnet.csproj", "{59CF2F3B-5FCC-43BE-B221-1E7A956D4792}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "edge-modules", "edge-modules", "{17D4D30E-7C88-479D-AF04-735DCCBA3AD4}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "functions", "functions", "{72DC75C8-2116-4836-BB95-2D2B5BF34452}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "samples", "samples", "{10886974-CE80-40FC-9647-A9C145DE420C}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EdgeHubTriggerCSharp", "edge-modules\functions\samples\EdgeHubTrigger-Csharp\EdgeHubTriggerCSharp.csproj", "{8E7FB9D5-4736-4CE0-8698-2F30E2E49B59}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		CheckInBuild|Any CPU = CheckInBuild|Any CPU
@@ -602,12 +602,6 @@ Global
 		{5D0F6FB0-8716-4247-A5BE-92DA5B9E2189}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{5D0F6FB0-8716-4247-A5BE-92DA5B9E2189}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{5D0F6FB0-8716-4247-A5BE-92DA5B9E2189}.Release|Any CPU.Build.0 = Release|Any CPU
-		{9F5BD0E2-E73D-434A-8568-0C117A0716C9}.CheckInBuild|Any CPU.ActiveCfg = CheckInBuild|Any CPU
-		{9F5BD0E2-E73D-434A-8568-0C117A0716C9}.CheckInBuild|Any CPU.Build.0 = CheckInBuild|Any CPU
-		{9F5BD0E2-E73D-434A-8568-0C117A0716C9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{9F5BD0E2-E73D-434A-8568-0C117A0716C9}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{9F5BD0E2-E73D-434A-8568-0C117A0716C9}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{9F5BD0E2-E73D-434A-8568-0C117A0716C9}.Release|Any CPU.Build.0 = Release|Any CPU
 		{B0151FFD-85C4-42B9-81CC-9193BADFE9F8}.CheckInBuild|Any CPU.ActiveCfg = CheckInBuild|Any CPU
 		{B0151FFD-85C4-42B9-81CC-9193BADFE9F8}.CheckInBuild|Any CPU.Build.0 = CheckInBuild|Any CPU
 		{B0151FFD-85C4-42B9-81CC-9193BADFE9F8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
@@ -638,6 +632,12 @@ Global
 		{59CF2F3B-5FCC-43BE-B221-1E7A956D4792}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{59CF2F3B-5FCC-43BE-B221-1E7A956D4792}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{59CF2F3B-5FCC-43BE-B221-1E7A956D4792}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8E7FB9D5-4736-4CE0-8698-2F30E2E49B59}.CheckInBuild|Any CPU.ActiveCfg = CheckInBuild|Any CPU
+		{8E7FB9D5-4736-4CE0-8698-2F30E2E49B59}.CheckInBuild|Any CPU.Build.0 = CheckInBuild|Any CPU
+		{8E7FB9D5-4736-4CE0-8698-2F30E2E49B59}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8E7FB9D5-4736-4CE0-8698-2F30E2E49B59}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8E7FB9D5-4736-4CE0-8698-2F30E2E49B59}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8E7FB9D5-4736-4CE0-8698-2F30E2E49B59}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -720,14 +720,14 @@ Global
 		{111DFD7C-FC04-4A68-8CC1-D986CCC3DAC3} = {F5A09810-99FB-43EB-A86E-A15E48EED108}
 		{240DF1F3-6472-472A-9748-494D79AEF085} = {F5A09810-99FB-43EB-A86E-A15E48EED108}
 		{5D0F6FB0-8716-4247-A5BE-92DA5B9E2189} = {F5A09810-99FB-43EB-A86E-A15E48EED108}
-		{059BC610-4D1E-4A4D-9099-E67DF47D7DB7} = {43E10CBA-2F64-4B4C-A5A5-B9E332DC98A1}
-		{4F3B7488-3547-4EEB-A79E-9737182960AB} = {059BC610-4D1E-4A4D-9099-E67DF47D7DB7}
-		{9F5BD0E2-E73D-434A-8568-0C117A0716C9} = {4F3B7488-3547-4EEB-A79E-9737182960AB}
 		{B0151FFD-85C4-42B9-81CC-9193BADFE9F8} = {F921339B-32F9-4BF3-B364-2DB01FA2F1A1}
 		{1915CE7E-E949-4633-9862-D92BD5E873B5} = {66964A75-04AC-4FDE-8505-E6CB2EF90BE8}
 		{BE39EC1F-7E7C-4421-93BF-1DF02C1E6A15} = {66964A75-04AC-4FDE-8505-E6CB2EF90BE8}
 		{C4C3CEB4-1177-4D1C-9BAE-EE0453831905} = {A6D8677F-DB76-459E-B6DE-110AFCEF7F08}
 		{59CF2F3B-5FCC-43BE-B221-1E7A956D4792} = {578D5330-2F72-44C6-9DB5-C93B3F42C473}
+		{72DC75C8-2116-4836-BB95-2D2B5BF34452} = {17D4D30E-7C88-479D-AF04-735DCCBA3AD4}
+		{10886974-CE80-40FC-9647-A9C145DE420C} = {72DC75C8-2116-4836-BB95-2D2B5BF34452}
+		{8E7FB9D5-4736-4CE0-8698-2F30E2E49B59} = {10886974-CE80-40FC-9647-A9C145DE420C}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {D71830F5-3AF5-46B4-8A9E-1DCE4F2253AC}

builds/checkin/dotnet.yaml

@@ -11,7 +11,7 @@ jobs:
 ################################################################################
     displayName: Check pipeline preconditions (changes ARE NOT in either edgelet, docs, or mqtt folder)
     pool:
-      vmImage: "ubuntu-18.04"
+      vmImage: "ubuntu-20.04"
     steps:
       - bash: |
           git log -m -1 --name-only --first-parent --pretty="" | egrep -i -v '^(edgelet|doc|mqtt)'
@@ -29,7 +29,7 @@ jobs:
     dependsOn: check_run_pipeline
     condition: eq(dependencies.check_run_pipeline.outputs['check_files.RUN_PIPELINE'], 'true')
     pool:
-      vmImage: "ubuntu-18.04"
+      vmImage: "ubuntu-20.04"
     steps:
       - task: Bash@3
         displayName: Install Prerequisites
@@ -66,7 +66,7 @@ jobs:
     variables:
       coverage.goal: 60
     pool:
-      vmImage: windows-2019
+      vmImage: windows-2022
     steps:
       - task: DotNetCoreCLI@2
         displayName: Build

builds/e2e/compare-compatibility.yaml

@@ -59,7 +59,7 @@ jobs:
         script: |
           az login --service-principal -p $(edgebuild-service-principal-secret) -u $(servicePrincipal.clientId) --tenant $(servicePrincipal.tenantId)
     - bash: |
-          contextPath=$(Build.SourcesDirectory)/test/Microsoft.Azure.Devices.Edge.Test/bin/Debug/netcoreapp3.1/context.json
+          contextPath=$(Build.SourcesDirectory)/test/Microsoft.Azure.Devices.Edge.Test/bin/Debug/net6.0/context.json
           mkdir -p $(Build.ArtifactStagingDirectory)/compat
           edgeAgentImage="$(cat $contextPath | jq '.edgeAgentImage' | tr -d '"')" 
           edgeHubImage="$(cat $contextPath | jq '.edgeHubImage' | tr -d '"')"
@@ -171,7 +171,7 @@ jobs:
           export PATH=azure-cli-env/bin/:$PATH
           az login --service-principal -p $(edgebuild-service-principal-secret) -u $(servicePrincipal.clientId) --tenant $(servicePrincipal.tenantId)
 
-          contextPath=$(Build.SourcesDirectory)/test/Microsoft.Azure.Devices.Edge.Test/bin/Debug/netcoreapp3.1/context.json
+          contextPath=$(Build.SourcesDirectory)/test/Microsoft.Azure.Devices.Edge.Test/bin/Debug/net6.0/context.json
           mkdir -p $(Build.ArtifactStagingDirectory)/compat
           edgeAgentImage="$(cat $contextPath | jq '.edgeAgentImage' | tr -d '"')" 
           edgeHubImage="$(cat $contextPath | jq '.edgeHubImage' | tr -d '"')"

builds/e2e/proxy/configure_runner.sh

@@ -7,15 +7,15 @@ proxy="http://${1}:3128"
 export http_proxy=$proxy
 export https_proxy=$proxy
 
-echo 'Installing PowerShell Core and .NET Core 3.1'
+echo 'Installing PowerShell Core and .NET 6.0'
 
 apt-get update
 apt-get install -y curl git wget apt-transport-https
 wget -q 'https://packages.microsoft.com/config/ubuntu/18.04/packages-microsoft-prod.deb'
 dpkg -i packages-microsoft-prod.deb
 apt-get update
 add-apt-repository universe
-apt-get install -y powershell dotnet-sdk-3.1
+apt-get install -y powershell dotnet-sdk-6.0
 
 echo 'Installing Moby engine'
 

builds/e2e/templates/e2e-setup-base-image-update-release.yaml

@@ -53,7 +53,7 @@ steps:
       $testDir = '$(Build.SourcesDirectory)/test/Microsoft.Azure.Devices.Edge.Test'
       dotnet build -c $(Build.Configuration) $testDir
   
-      $binDir = Convert-Path "$testDir/bin/$(Build.Configuration)/netcoreapp3.1"
+      $binDir = Convert-Path "$testDir/bin/$(Build.Configuration)/net6.0"
       Write-Output "##vso[task.setvariable variable=binDir]$binDir"
     env:
       http_proxy: $(Agent.ProxyUrl)
@@ -63,7 +63,7 @@ steps:
   - pwsh: |
       $manifestSignerClientDir = '$(Build.SourcesDirectory)/samples/dotnet/ManifestSignerClient'
       dotnet build -c $(Build.Configuration) $manifestSignerClientDir
-      $manifestSignerClientBinDir = Convert-Path "$manifestSignerClientDir/bin/$(Build.Configuration)/netcoreapp3.1"
+      $manifestSignerClientBinDir = Convert-Path "$manifestSignerClientDir/bin/$(Build.Configuration)/net6.0"
       Write-Output "##vso[task.setvariable variable=manifestSignerClientDir]$manifestSignerClientDir"
       Write-Output "##vso[task.setvariable variable=manifestSignerClientBinDir]$manifestSignerClientBinDir"
       $manifestSigningTestDir = '$(System.ArtifactsDirectory)/manifest_signing'

builds/e2e/templates/e2e-setup.yaml

@@ -129,7 +129,7 @@ steps:
       $testDir = '$(Build.SourcesDirectory)/test/Microsoft.Azure.Devices.Edge.Test'
       dotnet build $testDir
 
-      $binDir = Convert-Path "$testDir/bin/Debug/netcoreapp3.1"
+      $binDir = Convert-Path "$testDir/bin/Debug/net6.0"
       Write-Output "##vso[task.setvariable variable=binDir]$binDir"
     env:
       http_proxy: $(Agent.ProxyUrl)
@@ -139,7 +139,7 @@ steps:
   - pwsh: |
       $manifestSignerClientDir = '$(Build.SourcesDirectory)/samples/dotnet/ManifestSignerClient'
       dotnet build $manifestSignerClientDir
-      $manifestSignerClientBinDir = Convert-Path "$manifestSignerClientDir/bin/Debug/netcoreapp3.1"
+      $manifestSignerClientBinDir = Convert-Path "$manifestSignerClientDir/bin/Debug/net6.0"
       Write-Output "##vso[task.setvariable variable=manifestSignerClientDir]$manifestSignerClientDir"
       Write-Output "##vso[task.setvariable variable=manifestSignerClientBinDir]$manifestSignerClientBinDir"
       $manifestSigningTestDir = '$(System.ArtifactsDirectory)/manifest_signing'

builds/misc/images-mqtt.yaml

@@ -78,7 +78,7 @@ jobs:
         displayName: Build MQTT Broker - arm32
         inputs:
           filePath: scripts/linux/cross-platform-rust-build.sh
-          arguments: --os ubuntu18.04 --arch arm32v7 --build-path mqtt/mqttd --cargo-flags '--no-default-features --features="generic"'
+          arguments: --os ubuntu20.04 --arch arm32v7 --build-path mqtt/mqttd --cargo-flags '--no-default-features --features="generic"'
 
       - script: scripts/linux/consolidate-build-artifacts.sh --artifact-name 'mqttd'
         displayName: Consolidate MQTT Broker artifacts

builds/misc/images-release.yaml

@@ -12,20 +12,28 @@ stages:
     dependsOn: []
     jobs:
     - job: BuildDotnetComponents
-      # The code sign steps will fail unless we explicitly say to use dotnet 2 before.
-      # This means we have to toggle back and forth between primary dotnet installations for the sign and build.
-      # TODO: Investigate why we have to toggle primary installs on linux, when we didn't have to do this on windows (now removed).
       displayName: Build Dotnet Components
       steps: 
-        - template: ../templates/dotnet3-globaljson.yaml # use dotnet 3 as primary install for build
         # Build
         - task: ShellScript@2
-          displayName: "Build (Release) dotnet artifacts"
+          displayName: "Build .NET artifacts"
           inputs: 
             args: "-c Release"
             scriptPath: scripts/linux/buildBranch.sh
+        - task: DotNetCoreCLI@2
+          displayName: "Build Functions Binding nuget package"
+          inputs:
+            buildProperties: OutDir=$(Build.BinariesDirectory)/publish/Microsoft.Azure.WebJobs.Extensions.EdgeHub
+            command: pack
+            nobuild: true
+            packDirectory: $(Build.BinariesDirectory)/publish/
+            packagesToPack: "**/Microsoft.Azure.WebJobs.Extensions.EdgeHub.csproj"
+            versionEnvVar: version
+            versioningScheme: byEnvVar
+        # The code sign task requires .NET Core 2.1.
+        # TODO: Investigate why we have to toggle primary installs on linux, when we didn't have to do this on windows (now removed).
+        - template: ../templates/force-dotnet21.yaml
         # Code Sign
-        - template: ../templates/dotnet2-globaljson.yaml # switch to dotnet 2 as primary install for code sign
         - task: SFP.build-tasks.custom-build-task-1.EsrpCodeSigning@1
           displayName: "Edge Agent Code Sign"
           inputs: 
@@ -246,18 +254,6 @@ stages:
                   }
                 ]
             signConfigType: inlineSignParams
-        - template: ../templates/dotnet3-globaljson.yaml # switch to dotnet 3 as primary install for nuget package
-        - task: DotNetCoreCLI@2
-          displayName: "Functions Binding nuget package"
-          inputs:
-            buildProperties: OutDir=$(Build.BinariesDirectory)/publish/Microsoft.Azure.WebJobs.Extensions.EdgeHub
-            command: pack
-            nobuild: true
-            packDirectory: $(Build.BinariesDirectory)/publish/
-            packagesToPack: "**/Microsoft.Azure.WebJobs.Extensions.EdgeHub.csproj"
-            versionEnvVar: version
-            versioningScheme: byEnvVar
-        - template: ../templates/dotnet2-globaljson.yaml # switch to dotnet 2 as primary install for code sign
         - task: SFP.build-tasks.custom-build-task-1.EsrpCodeSigning@1
           displayName: "Functions Binding nuget package Sign"
           inputs:
@@ -282,6 +278,8 @@ stages:
                   }
                 ]
             signConfigType: inlineSignParams
+        # We're done with code signing, so remove dotnet version override
+        - template: ../templates/restore-default-dotnet.yaml
         - bash: |
             mkdir $(Build.ArtifactStagingDirectory)/publish-linux && \
             mv $(Build.BinariesDirectory)/publish/{CACertificates,e2e_deployment_files,e2e_test_files,\

builds/misc/templates/build-broker-watchdog.yaml

@@ -22,7 +22,7 @@ jobs:
       displayName: Build MQTT Broker - arm32
       inputs:
         filePath: scripts/linux/cross-platform-rust-build.sh
-        arguments: --os ubuntu18.04 --arch arm32v7 --build-path mqtt/mqttd
+        arguments: --os ubuntu20.04 --arch arm32v7 --build-path mqtt/mqttd
     - task: CopyFiles@2
       inputs:
         sourceFolder: 'mqtt/target/armv7-unknown-linux-gnueabihf/release/'
@@ -39,7 +39,7 @@ jobs:
       displayName: Build MQTT Broker - arm64
       inputs:
         filePath: scripts/linux/cross-platform-rust-build.sh
-        arguments: --os ubuntu18.04 --arch aarch64 --build-path mqtt/mqttd
+        arguments: --os ubuntu20.04 --arch aarch64 --build-path mqtt/mqttd
     - task: CopyFiles@2
       inputs:
         sourceFolder: 'mqtt/target/aarch64-unknown-linux-gnu/release/'
@@ -73,7 +73,7 @@ jobs:
       displayName: Build watchdog - arm32
       inputs:
         filePath: scripts/linux/cross-platform-rust-build.sh
-        arguments: --os ubuntu18.04 --arch arm32v7 --build-path edge-hub/watchdog
+        arguments: --os ubuntu20.04 --arch arm32v7 --build-path edge-hub/watchdog
     - task: CopyFiles@2
       inputs:
         sourceFolder: 'edge-hub/watchdog/target/armv7-unknown-linux-gnueabihf/release/'
@@ -90,7 +90,7 @@ jobs:
       displayName: Build watchdog - arm64
       inputs:
         filePath: scripts/linux/cross-platform-rust-build.sh
-        arguments: --os ubuntu18.04 --arch aarch64 --build-path edge-hub/watchdog
+        arguments: --os ubuntu20.04 --arch aarch64 --build-path edge-hub/watchdog
     - task: CopyFiles@2
       inputs:
         sourceFolder: 'edge-hub/watchdog/target/aarch64-unknown-linux-gnu/release/'

builds/misc/templates/build-images.yaml

@@ -47,7 +47,7 @@ stages:
     pool:
       name: $(pool.linux.name)
       demands:
-        - ImageOverride -equals agent-aziotedge-ubuntu-20.04-docker  
+        - ImageOverride -equals agent-aziotedge-ubuntu-20.04-docker
     dependsOn: CheckBuildImages
     jobs:
     - job: BuildDotnetComponents
@@ -137,7 +137,7 @@ stages:
     pool:
       name: $(pool.linux.name)
       demands:
-        - ImageOverride -equals agent-aziotedge-ubuntu-20.04-docker  
+        - ImageOverride -equals agent-aziotedge-ubuntu-20.04-docker
     dependsOn: [BuildExecutables, BuildRocksDB]
     jobs:
     - job: ConsolidateAndPublishArtifacts
@@ -323,11 +323,11 @@ stages:
     - job: BuildImageFunctionsSample
       steps:
       - template: image-linux.yaml
-        parameters:      
+        parameters:
           name: Functions Sample
           imageName: azureiotedge-functions-filter
           project: EdgeHubTriggerCSharp
-          bin_dir: '$(Build.BinariesDirectory)'      
+          bin_dir: '$(Build.BinariesDirectory)'
 
     - job: BuildImageDirectMethodSender
       steps:

builds/misc/templates/rust-test-module-build.yaml

@@ -10,7 +10,7 @@ steps:
   displayName: Build ${{ parameters['module.name'] }} - ${{ parameters['arch'] }}
   inputs:
     filePath: scripts/linux/cross-platform-rust-build.sh
-    arguments: --os ubuntu18.04 --arch ${{ parameters['arch'] }} --build-path ${{ parameters['module.path'] }}
+    arguments: --os ubuntu20.04 --arch ${{ parameters['arch'] }} --build-path ${{ parameters['module.path'] }}
 - task: PublishBuildArtifacts@1
   inputs:
     pathToPublish: ${{ parameters['module.path'] }}/target/${{ parameters['target'] }}/release/${{ parameters['module.name'] }}

builds/service/service-deployment.yaml

@@ -30,7 +30,7 @@ steps:
     $testDir = '$(Build.SourcesDirectory)/test/Microsoft.Azure.Devices.Edge.Test'
     dotnet build $testDir
 
-    $binDir = Convert-Path "$testDir/bin/Debug/netcoreapp3.1"
+    $binDir = Convert-Path "$testDir/bin/Debug/net6.0"
     Write-Output "##vso[task.setvariable variable=binDir]$binDir"
   displayName: Build tests
 

builds/templates/force-dotnet21.yaml

@@ -0,0 +1,7 @@
+# Add a global.json file to the root of the source code directory. This will override .NET's
+# default behavior when determining which version of the runtime to use. Instead, .NET will
+# use the version we specify here.
+steps:
+  - bash: |
+      dotnet new globaljson --force --sdk-version 2.1
+    displayName: Use .NET Core 2.1

builds/templates/restore-default-dotnet.yaml

@@ -0,0 +1,7 @@
+# Remove the global.json file from the root of the source code directory, if it exists. This will
+# remove any overrides, allowing .NET to use its default behavior (use latest) when determining
+# which version of the runtime to use.
+steps:
+  - bash: |
+      rm -f -v global.json
+    displayName: Restore default .NET version