tools: use dotnet build in VS2015 CI

tools/build.bat

@@ -27,6 +27,7 @@ if X%~nx0==Xbuild-choco.bat (
 set BuildArm64=yes
 if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2015" (
     set BuildArm64=no
+    set UseDotnetSdk=yes
 )
 if "%APPVEYOR_BUILD_WORKER_IMAGE%"=="Visual Studio 2017" (
     set BuildArm64=no
@@ -56,6 +57,13 @@ if X%SignedPackage%==X (
     if exist build\ for /R build\ %%d in (%Configuration%) do (
         if exist "%%d" rmdir /s/q "%%d"
     )
+	
+    if X%UseDotnetSdk%==Xyes (
+        dotnet build ./dotnet/ -c "%Configuration%" -p:SolutionDir=..\
+        if errorlevel 1 goto fail
+        dotnet build ./testing/memfs-dotnet.csproj -c "%Configuration%" -p:SolutionDir=..\
+        if errorlevel 1 goto fail
+    )
 
     if X%BuildArm64%==Xyes (
         devenv winfsp.sln /build "%Configuration%|ARM64"

tools/gensrc/remove-build-dotnet.bat

@@ -0,0 +1,17 @@
+@echo off
+
+setlocal
+setlocal EnableDelayedExpansion
+
+if "%1"=="" (
+    cd %~dp0..\..
+) else (
+    cd "%1"
+)
+
+
+if exist winfsp.sln (
+    powershell -NoProfile -ExecutionPolicy Bypass -Command "& '%~dp0remove-sln-project.ps1' -Path '%cd%\winfsp.sln' -Match '*dotnet*'
+) else (
+    echo winfsp.sln not found in %cd%
+)

tools/gensrc/remove-sln-project.ps1

@@ -0,0 +1,12 @@
+param (
+    [Parameter(Mandatory)][string]$Path,
+    [Parameter(Mandatory)][string]$Match
+)
+
+echo "Removing projects that match $($Match) from $($Path)"
+
+Get-Content $Path -Delimiter 'EndProject' |
+  Where-Object {$_ -notlike $Match} |
+  Set-Content "$($Path).new"
+  
+ Move-Item -Path "$($Path).new" -Destination $Path -Force