diff --git a/pkgs/development/compilers/dotnet/buildDotnet.nix b/pkgs/development/compilers/dotnet/buildDotnet.nix
new file mode 100644
index 00000000000..0c2222c4c83
--- /dev/null
+++ b/pkgs/development/compilers/dotnet/buildDotnet.nix
@@ -0,0 +1,66 @@
+{ type
+, version
+, sha512
+}:
+assert builtins.elem type [ "aspnetcore" "netcore" "sdk"];
+{ stdenv
+, fetchurl
+, libunwind
+, openssl
+, icu
+, libuuid
+, zlib
+, curl
+}: 
+let pname = if type == "aspnetcore" then "aspnetcore-runtime" else if type == "netcore" then "dotnet-runtime" else "dotnet-sdk";
+    urls = {
+        aspnetcore = "https://dotnetcli.azureedge.net/dotnet/aspnetcore/Runtime/${version}/${pname}-${version}-linux-x64.tar.gz";
+        netcore = "https://dotnetcli.azureedge.net/dotnet/Runtime/${version}/${pname}-${version}-linux-x64.tar.gz";
+        sdk = "https://dotnetcli.azureedge.net/dotnet/Sdk/${version}/${pname}-${version}-linux-x64.tar.gz";
+    };
+    descriptions = {
+        aspnetcore = "ASP .NET Core runtime ${version}";
+        netcore = ".NET Core runtime ${version}";
+        sdk = ".NET SDK ${version}";
+    };
+in stdenv.mkDerivation rec {
+    inherit pname version;
+
+    rpath = stdenv.lib.makeLibraryPath [ stdenv.cc.cc libunwind libuuid icu openssl zlib curl ];
+
+    src = fetchurl {
+        url = builtins.getAttr type urls;
+        inherit sha512;
+    };
+
+    sourceRoot = ".";
+
+    dontPatchELF = true;
+
+    installPhase = ''
+        runHook preInstall
+        mkdir -p $out/bin
+        cp -r ./ $out
+        ln -s $out/dotnet $out/bin/dotnet
+        runHook postInstall
+    '';
+
+    postFixup = ''
+        patchelf --set-interpreter "${stdenv.cc.bintools.dynamicLinker}" $out/dotnet
+        patchelf --set-rpath "${rpath}" $out/dotnet
+        find $out -type f -name "*.so" -exec patchelf --set-rpath '$ORIGIN:${rpath}' {} \;
+    '';
+
+    doInstallCheck = true;
+    installCheckPhase = ''
+        $out/bin/dotnet --info
+    '';
+
+    meta = with stdenv.lib; {
+        homepage = https://dotnet.github.io/;
+        description = builtins.getAttr type descriptions;
+        platforms = [ "x86_64-linux" ];
+        maintainers = with maintainers; [ kuznero ];
+        license = licenses.mit;
+    };
+}
diff --git a/pkgs/development/compilers/dotnet/combinePackages.nix b/pkgs/development/compilers/dotnet/combinePackages.nix
new file mode 100644
index 00000000000..00fb7c6d9b4
--- /dev/null
+++ b/pkgs/development/compilers/dotnet/combinePackages.nix
@@ -0,0 +1,20 @@
+packages:
+{ buildEnv, lib }:
+let cli = builtins.head packages;
+in
+assert lib.assertMsg ((builtins.length packages) != 0)
+    ''You must include at least one package, e.g
+      `with dotnetCorePackages; combinePackages {
+          packages = [ sdk_3_0 aspnetcore_2_1 ];
+       };`'' ;
+  buildEnv {
+    name = "dotnet-core-combined";
+    paths = packages;
+    pathsToLink = [ "/host" "/packs" "/sdk" "/shared" "/templates" ];
+    ignoreCollisions = true;
+    postBuild = ''
+      cp ${cli}/dotnet $out/dotnet
+      mkdir $out/bin
+      ln -s $out/dotnet $out/bin/
+    '';
+  }
diff --git a/pkgs/development/compilers/dotnet/default.nix b/pkgs/development/compilers/dotnet/default.nix
new file mode 100644
index 00000000000..ab3b6503d09
--- /dev/null
+++ b/pkgs/development/compilers/dotnet/default.nix
@@ -0,0 +1,18 @@
+/*
+How to combine packages for use in development:
+dotnetCombined = with dotnetCorePackages; combinePackages [ sdk_3_1 sdk_2_2 sdk_3_0 sdk aspnetcore_2_1 ];
+*/
+{ callPackage }:
+let
+  buildDotnet = attrs: callPackage (import ./buildDotnet.nix attrs) {};
+  buildAspNetCore = attrs: buildDotnet (attrs // { type = "aspnetcore"; } );
+  buildNetCore = attrs: buildDotnet (attrs // { type = "netcore"; } );
+  buildNetCoreSdk = attrs: buildDotnet (attrs // { type = "sdk"; } );
+in rec {
+  combinePackages = attrs: callPackage (import ./combinePackages.nix attrs) {};
+
+  sdk_2_2 = buildNetCoreSdk {
+    version = "2.2.401";
+    sha512 = "05w3zk7bcd8sv3k4kplf20j906and2006g1fggq7y6kaxrlhdnpd6jhy6idm8v5bz48wfxga5b4yys9qx0fp3p8yl7wi67qljpzrq88";
+  };
+}
diff --git a/pkgs/development/compilers/dotnet/sdk/default.nix b/pkgs/development/compilers/dotnet/sdk/default.nix
deleted file mode 100644
index 984ab39c91a..00000000000
--- a/pkgs/development/compilers/dotnet/sdk/default.nix
+++ /dev/null
@@ -1,54 +0,0 @@
-{ stdenv
-, fetchurl
-, libunwind
-, openssl
-, icu
-, libuuid
-, zlib
-, curl
-}:
-
-let
-  rpath = stdenv.lib.makeLibraryPath [ stdenv.cc.cc libunwind libuuid icu openssl zlib curl ];
-in
-  stdenv.mkDerivation rec {
-    version = "2.2.401";
-    netCoreVersion = "2.2.6";
-    pname = "dotnet-sdk";
-
-    src = fetchurl {
-      url = "https://dotnetcli.azureedge.net/dotnet/Sdk/${version}/${pname}-${version}-linux-x64.tar.gz";
-      # use sha512 from the download page
-      sha512 = "05w3zk7bcd8sv3k4kplf20j906and2006g1fggq7y6kaxrlhdnpd6jhy6idm8v5bz48wfxga5b4yys9qx0fp3p8yl7wi67qljpzrq88";
-    };
-
-    sourceRoot = ".";
-
-    buildPhase = ''
-      runHook preBuild
-      patchelf --set-interpreter "${stdenv.cc.bintools.dynamicLinker}" ./dotnet
-      patchelf --set-rpath "${rpath}" ./dotnet
-      find -type f -name "*.so" -exec patchelf --set-rpath '$ORIGIN:${rpath}' {} \;
-      echo -n "dotnet-sdk version: "
-      ./dotnet --version
-      runHook postBuild
-    '';
-
-    dontPatchELF = true;
-
-    installPhase = ''
-      runHook preInstall
-      mkdir -p $out/bin
-      cp -r ./ $out
-      ln -s $out/dotnet $out/bin/dotnet
-      runHook postInstall
-    '';
-
-    meta = with stdenv.lib; {
-      homepage = https://dotnet.github.io/;
-      description = ".NET Core SDK ${version} with .NET Core ${netCoreVersion}";
-      platforms = [ "x86_64-linux" ];
-      maintainers = with maintainers; [ kuznero ];
-      license = licenses.mit;
-    };
-  }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 0ebc137e070..891e984a248 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -213,7 +213,9 @@ in
 
   dotnetbuildhelpers = callPackage ../build-support/dotnetbuildhelpers { };
 
-  dotnet-sdk = callPackage ../development/compilers/dotnet/sdk { };
+  dotnetCorePackages = recurseIntoAttrs (callPackage ../development/compilers/dotnet {});
+
+  dotnet-sdk = dotnetCorePackages.sdk_2_2;
 
   dumb-init = callPackage ../applications/virtualization/dumb-init {};