Inject the version

build.cake

@@ -95,6 +95,7 @@ Task("Build")
         .SetConfiguration(configuration)
         .SetPlatformTarget(PlatformTarget.MSIL)
         .WithProperty("TreatWarningsAsErrors", "true")
+        .WithProperty("Version", version)
         .SetVerbosity(Verbosity.Minimal)
         .UseToolVersion(MSBuildToolVersion.VS2017)
     );
@@ -103,6 +104,7 @@ Task("Build")
         .SetConfiguration(configuration)
         .SetPlatformTarget(PlatformTarget.x86)
         .WithProperty("TreatWarningsAsErrors", "true")
+        .WithProperty("Version", version)
         .WithProperty("AppxPackageSigningEnabled", "false")
         .SetVerbosity(Verbosity.Minimal)
         .UseToolVersion(MSBuildToolVersion.VS2017)
@@ -121,6 +123,7 @@ Task("Package")
         .SetConfiguration(configuration)
         .SetPlatformTarget(PlatformTarget.MSIL)
         .WithProperty("TreatWarningsAsErrors", "true")
+        .WithProperty("Version", version)
         .WithTarget("Pack")
         .SetVerbosity(Verbosity.Minimal)
         .UseToolVersion(MSBuildToolVersion.VS2017)

src/nunit.xamarin/nunit.xamarin.csproj

@@ -7,7 +7,7 @@
     <Copyright>Copyright (C) 2018, Rob Prouse</Copyright>
     <Title>NUnit.Xamarin</Title>
     <Description>NUnit 3 Test Runner for Xamarin</Description>
-    <Version>3.10.1</Version>
+    <Version Condition="'$(Version)' == ''">3.10.1</Version>
 
     <!-- NuGet Package Info -->
     <PackageId>nunit.xamarin</PackageId>