From 92cd0740972188b857681410dae7b2617b6100e5 Mon Sep 17 00:00:00 2001
From: Stef Heyenrath <Stef.Heyenrath@gmail.com>
Date: Mon, 25 Jan 2021 08:19:31 +0100
Subject: [PATCH] Created Xamarin - Could not load file or assembly (markdown)

---
 Xamarin---Could-not-load-file-or-assembly.md | 36 ++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 Xamarin---Could-not-load-file-or-assembly.md

diff --git a/Xamarin---Could-not-load-file-or-assembly.md b/Xamarin---Could-not-load-file-or-assembly.md
new file mode 100644
index 0000000..2af6f8a
--- /dev/null
+++ b/Xamarin---Could-not-load-file-or-assembly.md
@@ -0,0 +1,36 @@
+When using WireMock.Net in a Xamarin test project, you can encounter these errors:
+
+## Could not load file or assembly 'System.Memory, Version=4.0.1.0
+```
+WireMock.Exceptions.WireMockException : Service start failed with error: One or more errors occurred. (Could not load type of field 'Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketTransportOptions:<MemoryPoolFactory>k__BackingField' (1) due to: Could not load file or assembly 'System.Memory, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies.)
+  ----> System.AggregateException : One or more errors occurred. (Could not load type of field 'Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketTransportOptions:<MemoryPoolFactory>k__BackingField' (1) due to: Could not load file or assembly 'System.Memory, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies.)
+  ----> System.TypeLoadException : Could not load type of field 'Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.SocketTransportOptions:<MemoryPoolFactory>k__BackingField' (1) due to: Could not load file or assembly 'System.Memory, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies.
+TearDown : System.NullReferenceException : Object reference not set to an instance of an object
+```
+
+or
+
+### Solution:
+
+Adding assembly binding redirects to the app.config for the assemblies which have an error.
+Like:
+``` xml
+<runtime>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+      <dependentAssembly>
+        <assemblyIdentity name="System.Memory" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
+        <bindingRedirect oldVersion="4.0.2.0-4.0.3.0" newVersion="4.0.3.0" />
+      </dependentAssembly>
+
+      <dependentAssembly>
+        <assemblyIdentity name="System.Buffers" publicKeyToken="cc7b13ffcd2ddd51" culture="neutral" />
+        <bindingRedirect oldVersion="4.0.2.0-4.0.3.0" newVersion="4.0.3.0" />
+      </dependentAssembly>
+
+      <dependentAssembly>
+        <assemblyIdentity name="System.Numerics.Vectors" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
+        <bindingRedirect oldVersion="4.0.0.0-4.1.4.0" newVersion="4.1.4.0"/>
+      </dependentAssembly>
+    </assemblyBinding>
+  </runtime>
+```
\ No newline at end of file