Implement json serialization/deserialization for LSP json messages. Part 1/N.

src/Features/LanguageServer/Protocol/LanguageServerProtocolResources.resx

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+<?xml version="1.0" encoding="utf-8"?>
+<root>
+	<!-- 
+		Microsoft ResX Schema
+
+		Version 1.3
+
+		The primary goals of this format is to allow a simple XML format 
+		that is mostly human readable. The generation and parsing of the 
+		various data types are done through the TypeConverter classes 
+		associated with the data types.
+
+		Example:
+
+		... ado.net/XML headers & schema ...
+		<resheader name="resmimetype">text/microsoft-resx</resheader>
+		<resheader name="version">1.3</resheader>
+		<resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+		<resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+		<data name="Name1">this is my long string</data>
+		<data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+		<data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+			[base64 mime encoded serialized .NET Framework object]
+		</data>
+		<data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+			[base64 mime encoded string representing a byte array form of the .NET Framework object]
+		</data>
+
+		There are any number of "resheader" rows that contain simple 
+		name/value pairs.
+
+		Each data row contains a name, and value. The row also contains a 
+		type or mimetype. Type corresponds to a .NET class that support 
+		text/value conversion through the TypeConverter architecture. 
+		Classes that don't support this are serialized and stored with the 
+		mimetype set.
+
+		The mimetype is used for serialized objects, and tells the 
+		ResXResourceReader how to depersist the object. This is currently not 
+		extensible. For a given mimetype the value must be set accordingly:
+
+		Note - application/x-microsoft.net.object.binary.base64 is the format 
+		that the ResXResourceWriter will generate, however the reader can 
+		read any of the formats listed below.
+
+		mimetype: application/x-microsoft.net.object.binary.base64
+		value   : The object must be serialized with 
+			: System.Serialization.Formatters.Binary.BinaryFormatter
+			: and then encoded with base64 encoding.
+
+		mimetype: application/x-microsoft.net.object.soap.base64
+		value   : The object must be serialized with 
+			: System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+			: and then encoded with base64 encoding.
+
+		mimetype: application/x-microsoft.net.object.bytearray.base64
+		value   : The object must be serialized into a byte array 
+			: using a System.ComponentModel.TypeConverter
+			: and then encoded with base64 encoding.
+	-->
+
+	<xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+		<xsd:element name="root" msdata:IsDataSet="true">
+			<xsd:complexType>
+				<xsd:choice maxOccurs="unbounded">
+					<xsd:element name="data">
+						<xsd:complexType>
+							<xsd:sequence>
+								<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+								<xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+							</xsd:sequence>
+							<xsd:attribute name="name" type="xsd:string" msdata:Ordinal="1" />
+							<xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+							<xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+						</xsd:complexType>
+					</xsd:element>
+					<xsd:element name="resheader">
+						<xsd:complexType>
+							<xsd:sequence>
+								<xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+							</xsd:sequence>
+							<xsd:attribute name="name" type="xsd:string" use="required" />
+						</xsd:complexType>
+					</xsd:element>
+				</xsd:choice>
+			</xsd:complexType>
+		</xsd:element>
+	</xsd:schema>
+	<resheader name="resmimetype">
+		<value>text/microsoft-resx</value>
+	</resheader>
+	<resheader name="version">
+		<value>1.3</value>
+	</resheader>
+	<resheader name="reader">
+		<value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=2.0.3500.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+	</resheader>
+	<resheader name="writer">
+		<value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=2.0.3500.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+	</resheader>
+  <data name="DocumentUriSerializationError" xml:space="preserve">
+    <value>Unable to deserialize Uri. Unexpected value encountered: {0}</value>
+  </data>
+  <data name="MarkupContentSerializationError" xml:space="preserve">
+    <value>Unable to deserialize MarkupContent. Unexpected value encountered: {0}</value>
+  </data>
+  <data name="NestedSumType" xml:space="preserve">
+    <value>A SumType cannot have another SumType as type parameter.</value>
+  </data>
+  <data name="NoSumTypeMatch" xml:space="preserve">
+    <value>None of the SumType type parameters could be deserialized</value>
+  </data>
+  <data name="StringEnumMissingConstructor" xml:space="preserve">
+    <value>Type {0} is missing a contructor that takes a single string as parameter.</value>
+  </data>
+  <data name="StringEnumSerializationError" xml:space="preserve">
+    <value>Unable to deserialize string-based enum. Unexpected data encountered: {0}</value>
+  </data>
+  <data name="TextDocumentSyncSerializationError" xml:space="preserve">
+    <value>Unable to deserialize TextDocumentSyncOptions.  Unexpected value encountered: {0}</value>
+  </data>
+</root>

src/Features/LanguageServer/Protocol/Protocol/.editorconfig

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+[*.cs]
+
+# CS0436: Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+dotnet_diagnostic.CS0436.severity = none
+
+# CS8618: Non-nullable field must contain a non-null value when exiting constructor. Consider declaring as nullable.
+dotnet_diagnostic.CS8618.severity = none
+
+# CS8765: Nullability of type of parameter 'other' doesn't match overridden member (possibly because of nullability attributes).
+dotnet_diagnostic.CS8765.severity = none
+
+# CS8767: Nullability of reference types in type of parameter 'other' of 'bool CodeDescription.Equals(CodeDescription other)' doesn't match implicitly implemented member 'bool IEquatable<CodeDescription>.Equals(CodeDescription? other)' (possibly because of nullability attributes).
+dotnet_diagnostic.CS8767.severity = none
+
+# CS8603: Possible null reference return.
+dotnet_diagnostic.CS8603.severity = none
+
+# CS8604: Possible null reference argument for parameter 'uriString' in 'Uri.Uri(string uriString)'.
+dotnet_diagnostic.CS8604.severity = none
+
+# RS0030:  The symbol 'Uri.Uri(string)' is banned in this project
+dotnet_diagnostic.RS0030.severity = none

src/Features/LanguageServer/Protocol/Protocol/ApplyWorkspaceEditParams.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Roslyn.LanguageServer.Protocol
+{
+    using System.Runtime.Serialization;
+    using Newtonsoft.Json;
+
+    /// <summary>
+    /// Class representing the parameters sent from a server to a client for the workspace/applyEdit request.
+    ///
+    /// See the <see href="https://microsoft.github.io/language-server-protocol/specifications/specification-current/#applyWorkspaceEditParams">Language Server Protocol specification</see> for additional information.
+    /// </summary>
+    [DataContract]
+    internal class ApplyWorkspaceEditParams
+    {
+        /// <summary>
+        /// Gets or sets the label associated with this edit.
+        /// </summary>
+        [DataMember(Name = "label")]
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+        public string? Label
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets the edit to be applied to the workspace.
+        /// </summary>
+        [DataMember(Name = "edit")]
+        public WorkspaceEdit Edit
+        {
+            get;
+            set;
+        }
+    }
+}

src/Features/LanguageServer/Protocol/Protocol/ApplyWorkspaceEditResponse.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Roslyn.LanguageServer.Protocol
+{
+    using System.Runtime.Serialization;
+    using Newtonsoft.Json;
+
+    /// <summary>
+    /// Class representing the response sent for a workspace/applyEdit request.
+    ///
+    /// See the <see href="https://microsoft.github.io/language-server-protocol/specifications/specification-current/#applyWorkspaceEditResult">Language Server Protocol specification</see> for additional information.
+    /// </summary>
+    [DataContract]
+    internal class ApplyWorkspaceEditResponse
+    {
+        /// <summary>
+        /// Gets or sets a value indicating whether edits were applied or not.
+        /// </summary>
+        [DataMember(Name = "applied")]
+        public bool Applied
+        {
+            get;
+            set;
+        }
+
+        /// <summary>
+        /// Gets or sets a string with textual description for why the edit was not applied.
+        /// </summary>
+        [DataMember(Name = "failureReason")]
+        [JsonProperty(NullValueHandling = NullValueHandling.Ignore)]
+        public string? FailureReason
+        {
+            get;
+            set;
+        }
+    }
+}