Use JetBrains.Annotations package.

src/Volo.Abp/Abp/Modularity/AbpModuleDescriptor.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using JetBrains.Annotations;
+using Volo.CodeAnnotations;
 
 namespace Volo.Abp.Modularity
 {

src/Volo.CodeAnnotations/CodeAnnotations/CanBeNullAttribute.cs

@@ -1,12 +0,0 @@
-using System;
-
-namespace JetBrains.Annotations
-{
-    [AttributeUsage(
-         AttributeTargets.Method | AttributeTargets.Parameter |
-         AttributeTargets.Property | AttributeTargets.Delegate |
-         AttributeTargets.Field)]
-    public sealed class CanBeNullAttribute : Attribute
-    {
-    }
-}

src/Volo.CodeAnnotations/CodeAnnotations/Check.cs

@@ -1,8 +1,11 @@
 using System;
 using System.Diagnostics;
+using JetBrains.Annotations;
 
-namespace JetBrains.Annotations
+namespace Volo.CodeAnnotations
 {
+    //TODO: Remove this library and move Check to somewhere else!
+
     [DebuggerStepThrough]
     public static class Check
     {

src/Volo.CodeAnnotations/CodeAnnotations/ContractAnnotationAttribute.cs

@@ -1,23 +0,0 @@
-using System;
-
-namespace JetBrains.Annotations
-{
-    [AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
-    public sealed class ContractAnnotationAttribute : Attribute
-    {
-        public string Contract { get; private set; }
-
-        public bool ForceFullStates { get; private set; }
-
-        public ContractAnnotationAttribute([NotNull] string contract)
-            : this(contract, false)
-        {
-        }
-
-        public ContractAnnotationAttribute([NotNull] string contract, bool forceFullStates)
-        {
-            Contract = contract;
-            ForceFullStates = forceFullStates;
-        }
-    }
-}

src/Volo.CodeAnnotations/CodeAnnotations/ImplicitUseKindFlags.cs

@@ -1,14 +0,0 @@
-using System;
-
-namespace JetBrains.Annotations
-{
-    [Flags]
-    public enum ImplicitUseKindFlags
-    {
-        Default = Access | Assign | InstantiatedWithFixedConstructorSignature,
-        Access = 1,
-        Assign = 2,
-        InstantiatedWithFixedConstructorSignature = 4,
-        InstantiatedNoFixedConstructorSignature = 8
-    }
-}

src/Volo.CodeAnnotations/CodeAnnotations/ImplicitUseTargetFlags.cs

@@ -1,13 +0,0 @@
-using System;
-
-namespace JetBrains.Annotations
-{
-    [Flags]
-    public enum ImplicitUseTargetFlags
-    {
-        Default = Itself,
-        Itself = 1,
-        Members = 2,
-        WithMembers = Itself | Members
-    }
-}

src/Volo.CodeAnnotations/CodeAnnotations/InvokerParameterNameAttribute.cs

@@ -1,9 +0,0 @@
-using System;
-
-namespace JetBrains.Annotations
-{
-    [AttributeUsage(AttributeTargets.Parameter)]
-    public sealed class InvokerParameterNameAttribute : Attribute
-    {
-    }
-}

src/Volo.CodeAnnotations/CodeAnnotations/NoEnumerationAttribute.cs

@@ -1,9 +0,0 @@
-using System;
-
-namespace JetBrains.Annotations
-{
-    [AttributeUsage(AttributeTargets.Parameter)]
-    internal sealed class NoEnumerationAttribute : Attribute
-    {
-    }
-}

src/Volo.CodeAnnotations/CodeAnnotations/NotNullAttribute.cs

@@ -1,12 +0,0 @@
-using System;
-
-namespace JetBrains.Annotations
-{
-    [AttributeUsage(
-        AttributeTargets.Method | AttributeTargets.Parameter |
-        AttributeTargets.Property | AttributeTargets.Delegate |
-        AttributeTargets.Field)]
-    public sealed class NotNullAttribute : Attribute
-    {
-    }
-}

src/Volo.CodeAnnotations/CodeAnnotations/StringFormatMethodAttribute.cs

@@ -1,16 +0,0 @@
-using System;
-
-namespace JetBrains.Annotations
-{
-    [AttributeUsage(AttributeTargets.Constructor | AttributeTargets.Method | AttributeTargets.Property | AttributeTargets.Delegate)]
-    public sealed class StringFormatMethodAttribute : Attribute
-    {
-        public StringFormatMethodAttribute([NotNull] string formatParameterName)
-        {
-            FormatParameterName = formatParameterName;
-        }
-
-        [NotNull]
-        public string FormatParameterName { get; private set; }
-    }
-}

src/Volo.CodeAnnotations/CodeAnnotations/UsedImplicitlyAttribute.cs

@@ -1,34 +0,0 @@
-using System;
-
-namespace JetBrains.Annotations
-{
-    [AttributeUsage(AttributeTargets.All)]
-    public sealed class UsedImplicitlyAttribute : Attribute
-    {
-        public UsedImplicitlyAttribute()
-            : this(ImplicitUseKindFlags.Default, ImplicitUseTargetFlags.Default)
-        {
-        }
-
-        public UsedImplicitlyAttribute(ImplicitUseKindFlags useKindFlags)
-            : this(useKindFlags, ImplicitUseTargetFlags.Default)
-        {
-        }
-
-        public UsedImplicitlyAttribute(ImplicitUseTargetFlags targetFlags)
-            : this(ImplicitUseKindFlags.Default, targetFlags)
-        {
-        }
-
-        public UsedImplicitlyAttribute(
-            ImplicitUseKindFlags useKindFlags, ImplicitUseTargetFlags targetFlags)
-        {
-            UseKindFlags = useKindFlags;
-            TargetFlags = targetFlags;
-        }
-
-        public ImplicitUseKindFlags UseKindFlags { get; private set; }
-
-        public ImplicitUseTargetFlags TargetFlags { get; private set; }
-    }
-}

src/Volo.CodeAnnotations/project.json

@@ -1,7 +1,8 @@
-{
+{
   "version": "1.0.0-*",
 
   "dependencies": {
+    "JetBrains.Annotations": "10.2.1",
     "NETStandard.Library": "1.6.1"
   },
 

src/Volo.ExtensionMethods/Collections/Generic/CollectionExtensions.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using JetBrains.Annotations;
+using Volo.CodeAnnotations;
 
 namespace Volo.Collections.Generic
 {