Decompiling null GUID should set `Guid=""` to match.

6 files changed, 28 insertions, 1 deletions

diff --git a/src/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs b/src/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs
index 80ee75a5..d11a890c 100644
--- a/src/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs
+++ b/src/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs
@@ -4152,7 +4152,7 @@ namespace WixToolset.Core.WindowsInstaller
             {
                 var xComponent = new XElement(Names.ComponentElement,
                     new XAttribute("Id", row.FieldAsString(0)),
-                    row.IsColumnEmpty(1) ? null : new XAttribute("Guid", row.FieldAsString(1)));
+                    new XAttribute("Guid", row.FieldAsString(1) ?? String.Empty));
 
                 var attributes = row.FieldAsInteger(3);
 
diff --git a/src/test/WixToolsetTest.CoreIntegration/DecompileFixture.cs b/src/test/WixToolsetTest.CoreIntegration/DecompileFixture.cs
index 15082f2b..b07f5bda 100644
--- a/src/test/WixToolsetTest.CoreIntegration/DecompileFixture.cs
+++ b/src/test/WixToolsetTest.CoreIntegration/DecompileFixture.cs
@@ -72,5 +72,11 @@ namespace WixToolsetTest.CoreIntegration
         {
             DecompileAndCompare(@"TestData\Shortcut", "shortcuts.msi", "DecompiledShortcuts.wxs");
         }
+
+        [Fact]
+        public void CanDecompileNullComponent()
+        {
+            DecompileAndCompare(@"TestData\DecompileNullComponent", "example.msi", "Expected.wxs");
+        }
     }
 }
diff --git a/src/test/WixToolsetTest.CoreIntegration/TestData/DecompileNullComponent/Expected.wxs b/src/test/WixToolsetTest.CoreIntegration/TestData/DecompileNullComponent/Expected.wxs
new file mode 100644
index 00000000..89592150
--- /dev/null
+++ b/src/test/WixToolsetTest.CoreIntegration/TestData/DecompileNullComponent/Expected.wxs
@@ -0,0 +1,18 @@
+<Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
+  <Package Codepage="65001" Language="1033" Manufacturer="Example Corporation" Name="MsiPackage" UpgradeCode="{047730A5-30FE-4A62-A520-DA9381B8226A}" Version="1.0.0.0" Compressed="yes" InstallerVersion="200" ProductCode="{6F9B5694-F0F1-437C-919B-0D2DAF2D9DEA}">
+    <Directory Id="TARGETDIR" Name="SourceDir">
+      <Directory Id="ProgramFilesFolder">
+        <Directory Id="INSTALLFOLDER" Name="MsiPackage" ShortName="oekcr5lq">
+          <Component Id="filcV1yrx0x8wJWj4qMzcH21jwkPko" Guid="" Win64="no">
+            <File Id="filcV1yrx0x8wJWj4qMzcH21jwkPko" Name="test.txt" KeyPath="yes" Source="SourceDir\File\filcV1yrx0x8wJWj4qMzcH21jwkPko" />
+          </Component>
+        </Directory>
+      </Directory>
+    </Directory>
+    <Feature Id="ProductFeature" Level="1" Title="MsiPackage">
+      <ComponentRef Id="filcV1yrx0x8wJWj4qMzcH21jwkPko" />
+    </Feature>
+    <MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is already installed." />
+    <Media Id="1" Cabinet="example.cab" />
+  </Package>
+</Wix>
\ No newline at end of file
diff --git a/src/test/WixToolsetTest.CoreIntegration/TestData/DecompileNullComponent/example.cab b/src/test/WixToolsetTest.CoreIntegration/TestData/DecompileNullComponent/example.cab
new file mode 100644
index 00000000..125eeb2c
--- /dev/null
+++ b/src/test/WixToolsetTest.CoreIntegration/TestData/DecompileNullComponent/example.cab
diff --git a/src/test/WixToolsetTest.CoreIntegration/TestData/DecompileNullComponent/example.msi b/src/test/WixToolsetTest.CoreIntegration/TestData/DecompileNullComponent/example.msi
new file mode 100644
index 00000000..81335041
--- /dev/null
+++ b/src/test/WixToolsetTest.CoreIntegration/TestData/DecompileNullComponent/example.msi
diff --git a/src/test/WixToolsetTest.CoreIntegration/WixToolsetTest.CoreIntegration.csproj b/src/test/WixToolsetTest.CoreIntegration/WixToolsetTest.CoreIntegration.csproj
index 8e5a005c..6c494169 100644
--- a/src/test/WixToolsetTest.CoreIntegration/WixToolsetTest.CoreIntegration.csproj
+++ b/src/test/WixToolsetTest.CoreIntegration/WixToolsetTest.CoreIntegration.csproj
@@ -207,6 +207,9 @@
     <Content Include="TestData\WixlibWithBinaries\Package.en-us.wxl" CopyToOutputDirectory="PreserveNewest" />
     <Content Include="TestData\WixlibWithBinaries\Package.wxs" CopyToOutputDirectory="PreserveNewest" />
     <Content Include="TestData\WixlibWithBinaries\PackageComponents.wxs" CopyToOutputDirectory="PreserveNewest" />
+    <Content Include="TestData\DecompileNullComponent\example.cab" CopyToOutputDirectory="PreserveNewest" />
+    <Content Include="TestData\DecompileNullComponent\example.msi" CopyToOutputDirectory="PreserveNewest" />
+    <Content Include="TestData\DecompileNullComponent\Expected.wxs" CopyToOutputDirectory="PreserveNewest" />
   </ItemGroup>
 
   <ItemGroup>