CSHARP-3218: Annotate the MongoDB.Bson assembly with Preserve attribute as necessary.

Author: nirinchev

README.md

@@ -113,6 +113,7 @@ Please see our [guidelines](CONTRIBUTING.md) for contributing to the driver.
 * Bouke Haarsma             https://github.com/Bouke
 * James Hadwen              [email protected]
 * Nuri Halperin             https://github.com/nurih
+* Nikola Irinchev           https://github.com/nirinchev
 * Jacob Jewell              [email protected]
 * Danny Kendrick            https://github.com/dkendrick
 * Ruslan Khasanbaev         https://github.com/flaksirus

src/MongoDB.Bson/PreserveAttribute.cs

@@ -0,0 +1,39 @@
+/* Copyright 2020-present MongoDB Inc.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+using System;
+using System.ComponentModel;
+
+namespace MongoDB.Bson
+{
+    /// <summary>
+    /// Prevents the Xamarin managed linker from linking the target.
+    /// </summary>
+    [AttributeUsage(AttributeTargets.All)]
+    [EditorBrowsable(EditorBrowsableState.Never)]
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Design", "CA1051:Do not declare visible instance fields", Justification = "Copied from the doc: https://docs.microsoft.com/en-us/xamarin/ios/deploy-test/linker?tabs=windows#preserving-code")]
+    public sealed class PreserveAttribute : Attribute
+    {
+        /// <summary>
+        /// When used on a class rather than a property, ensures that all members of this type are preserved.
+        /// </summary>
+        public bool AllMembers;
+
+        /// <summary>
+        /// Flags the method as a method to preserve during linking if the container class is pulled in.
+        /// </summary>
+        public bool Conditional;
+    }
+}

src/MongoDB.Bson/Properties/AssemblyInfo.cs

@@ -16,8 +16,14 @@
 using System;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using MongoDB.Bson;
 
 [assembly: CLSCompliant(true)]
 [assembly: ComVisible(false)]
 
+// Prevents the Xamarin static linker from stripping anything from this assembly.
+// Required for most of the serialization classes on AOT compiled targets, such
+// as Xamarin.iOS/Xamarin.Mac.
+[assembly: Preserve(AllMembers = true)]
+
 [assembly: InternalsVisibleTo("MongoDB.Bson.Tests")]

src/MongoDB.Driver.Core/Properties/AssemblyInfo.cs

@@ -16,10 +16,15 @@
 using System;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using MongoDB.Bson;
 
 [assembly: CLSCompliant(true)]
 [assembly: ComVisible(false)]
 
+// Prevents the Xamarin static linker from stripping anything from this assembly.
+// Required for most of the reflection usage in Xamarin.iOS/Xamarin.Mac.
+[assembly: Preserve(AllMembers = true)]
+
 [assembly: InternalsVisibleTo("MongoDB.Driver.Core.FunctionalTests")]
 [assembly: InternalsVisibleTo("MongoDB.Driver.Core.TestHelpers")]
 [assembly: InternalsVisibleTo("MongoDB.Driver.Core.Tests")]

src/MongoDB.Driver.GridFS/Properties/AssemblyInfo.cs

@@ -16,8 +16,13 @@
 using System;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using MongoDB.Bson;
 
 [assembly: CLSCompliant(true)]
 [assembly: ComVisible(false)]
 
+// Prevents the Xamarin static linker from stripping anything from this assembly.
+// Required for most of the reflection usage in Xamarin.iOS/Xamarin.Mac.
+[assembly: Preserve(AllMembers = true)]
+
 [assembly: InternalsVisibleTo("MongoDB.Driver.GridFS.Tests")]

src/MongoDB.Driver.Legacy/Properties/AssemblyInfo.cs

@@ -16,9 +16,14 @@
 using System;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using MongoDB.Bson;
 
 [assembly: CLSCompliant(true)]
 [assembly: ComVisible(false)]
 
+// Prevents the Xamarin static linker from stripping anything from this assembly.
+// Required for most of the reflection usage in Xamarin.iOS/Xamarin.Mac.
+[assembly: Preserve(AllMembers = true)]
+
 [assembly: InternalsVisibleTo("MongoDB.Driver.Legacy.TestHelpers")]
 [assembly: InternalsVisibleTo("MongoDB.Driver.Legacy.Tests")]

src/MongoDB.Driver/Properties/AssemblyInfo.cs

@@ -16,10 +16,15 @@
 using System;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
+using MongoDB.Bson;
 
 [assembly: CLSCompliant(true)]
 [assembly: ComVisible(false)]
 
+// Prevents the Xamarin static linker from stripping anything from this assembly.
+// Required for most of the reflection usage in Xamarin.iOS/Xamarin.Mac.
+[assembly: Preserve(AllMembers = true)]
+
 [assembly: InternalsVisibleTo("MongoDB.Driver.Legacy")]
 [assembly: InternalsVisibleTo("MongoDB.Driver.Legacy.TestHelpers")]
 [assembly: InternalsVisibleTo("MongoDB.Driver.Legacy.Tests")]