[c#] Automatically find and run C# examples

* Comm examples are excluded, as Comm will be deleted soon.
* The gRPC shared-type-assembly examples are excluded, as they require
  starting two processing in a specific order and console input.

appveyor.yml

@@ -28,7 +28,7 @@
         # the Windows builds.
         - .travis.yml
         - tools/ci-scripts/linux/**
-    
+
     environment:
         global:
             STACK_ROOT: "c:\\sr"
@@ -94,6 +94,7 @@
               BOND_ARCH: 64
               BOND_BOOST: 58
               BOND_CMAKE_FLAGS: "-DBOND_ENABLE_COMM=TRUE;-DBOND_ENABLE_GRPC=FALSE;-DBOND_SKIP_CORE_TESTS=TRUE;-DBOND_SKIP_GBC_TESTS=TRUE"
+
     install:
         - ps: >-
             if (($env:BOND_BUILD -eq 'C++') -or ($env:BOND_BUILD -eq 'Python')) {
@@ -308,30 +309,19 @@
             }
 
             if ($env:BOND_BUILD -eq "C#") {
-
                 nunit-console-x86 /framework:net-4.5 /labels "cs\test\core\bin\debug\net45\${env:BOND_OUTPUT}\Bond.UnitTest.dll" cs\test\internal\bin\debug\net45\Bond.InternalTest.dll
                 if (-not $?) { throw "tests failed" }
 
                 nunit-console-x86 /framework:net-4.5 /labels "cs\test\core\bin\debug\net45-nonportable\${env:BOND_OUTPUT}\Bond.UnitTest.dll"
                 if (-not $?) { throw "tests failed" }
 
-                & examples\cs\grpc\pingpong\bin\Debug\grpc-pingpong.exe
-                if (-not $?) { throw "tests failed" }
-
-                & examples\cs\grpc\scalar\bin\Debug\grpc-scalar.exe
-                if (-not $?) { throw "tests failed" }
-
-                # We need to investigate why these tests are failing in AppVeyor, but not locally.
-                # nunit-console-x86 /framework:net-4.5 /labels "cs\test\comm\bin\debug\net45\${env:BOND_OUTPUT}\Bond.Comm.UnitTest.dll"
-                # if (-not $?) { throw "tests failed" }
-
+                & cs\test\test-examples.ps1 -IgnorePatterns '*\comm\*','*\shared-types-assembly\*' -ErrorVariable exampleErrors
+                if ($exampleErrors) { throw "One or more example failed. See above for details." }
             }
 
             if ($env:BOND_BUILD -eq "C# .NET Core") {
-
                 & cs\dnc\build.ps1 -Test -Configuration $env:BOND_CONFIG -Verbosity minimal -MSBuildLogger "C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
                 if (-not $?) { throw "tests failed" }
-
             }
 
             if (-not $?) { throw "build failed" }

cs/test/test-examples.ps1

@@ -0,0 +1,78 @@
+<#
+.SYNOPSIS
+
+Runs Bond C# examples for testing purposes. Writes an error record to
+the pipeline for each example that fails.
+
+.PARAMETER ExamplesRoot
+
+Path to the directory containing the built examples. Defaults to ..\..\examples\cs
+
+.PARAMETER IgnorePatterns
+
+A collection of -Like patterns specifying which examples to ignore.
+
+.EXAMPLE
+
+PS c:\src\bond\cs\test> .\test-examples.ps1 -IgnorePatterns '*comm*'
+
+This will run all the examples except those with "comm" in their paths.
+
+#>
+[CmdletBinding()]
+param
+(
+    [string]
+    $ExamplesRoot = '',
+
+    [string[]]
+    $IgnorePatterns = @()
+)
+
+Set-StrictMode -Version Latest
+
+function ShouldIgnore([string[]]$ignorePats, [string]$fullPath) {
+    Write-Debug "Checking $fullPath against ignore patterns"
+    ForEach ($pat in $ignorePats) {
+        if ($fullPath -Like $pat) {
+            Write-Debug "Ignoring ""$fullPath"". Matched pattern ""$pat"""
+            return $true
+        }
+    }
+
+    return $false
+}
+
+if ([string]::IsNullOrEmpty($ExamplesRoot)) {
+    $likelyExamplesDirectory = "$PSScriptRoot\..\..\examples\cs"
+    if (Test-Path $likelyExamplesDirectory -PathType Container) {
+        $ExamplesRoot = $likelyExamplesDirectory
+    } else {
+        throw "No ExamplesRoot was passed and the guessed ""$likelyExamplesDirectory"" didn't exist. Specify an ExamplesRoot."
+    }
+}
+
+$exampleExes = @()
+$exampleExes += dir -Recurse -Path $ExamplesRoot -Include '*.exe' -File |
+    Where-Object { -not (ShouldIgnore $IgnorePatterns $PSItem.FullName) } |
+    Where-Object -Property FullName -Like '*\bin\*'
+
+Write-Debug "Found examples: $exampleExes"
+
+try {
+    $exampleExes | ForEach-Object {
+        $exampleFullPath = $PSItem.FullName
+        Write-Progress -Activity 'Running examples' -Status "Running ""$exampleFullPath"""
+        Write-Debug "Running ""$exampleFullPath"""
+
+        $sw = [System.Diagnostics.Stopwatch]::StartNew()
+        & $exampleFullPath 2>&1 | Tee-Object -Variable output | Write-Debug
+        if (-not $?) {
+            Write-Error -Message "Example ""$exampleFullPath"" exited with $LASTEXITCODE. Output:`n$output" -TargetObject $PSItem
+        }
+
+        Write-Debug """$exampleFullPath"" took $($sw.Elapsed)"
+    }
+} finally {
+    Write-Progress -Activity 'Running examples' -Completed
+}