Fix argument helpers for netstandard and netfx

Author: captainsafia

src/Shared/ThrowHelpers/ArgumentNullThrowHelper.cs

@@ -16,7 +16,7 @@ internal static partial class ArgumentNullThrowHelper
     /// <param name="paramName">The name of the parameter with which <paramref name="argument"/> corresponds.</param>
     public static void ThrowIfNull([NotNull] object? argument, [CallerArgumentExpression("argument")] string? paramName = null)
     {
-#if !NET7_0_OR_GREATER
+#if !NET7_0_OR_GREATER || NETSTANDARD ||NETFRAMEWORK
         if (argument is null)
         {
             Throw(paramName);
@@ -26,7 +26,7 @@ public static void ThrowIfNull([NotNull] object? argument, [CallerArgumentExpres
 #endif
     }
 
-#if !NET7_0_OR_GREATER
+#if !NET7_0_OR_GREATER || NETSTANDARD ||NETFRAMEWORK
     [DoesNotReturn]
     internal static void Throw(string? paramName) =>
         throw new ArgumentNullException(paramName);

src/Shared/ThrowHelpers/ArgumentThrowHelper.cs

@@ -11,7 +11,7 @@ namespace Microsoft.AspNetCore.Shared;
 
 internal static partial class ArgumentThrowHelper
 {
-#if !NET7_0_OR_GREATER
+#if !NET7_0_OR_GREATER || NETSTANDARD ||NETFRAMEWORK
     private const string EmptyString = "";
 #endif
 
@@ -20,7 +20,7 @@ internal static partial class ArgumentThrowHelper
     /// <param name="paramName">The name of the parameter with which <paramref name="argument"/> corresponds.</param>
     public static void ThrowIfNullOrEmpty([NotNull] string? argument, [CallerArgumentExpression("argument")] string? paramName = null)
     {
-#if !NET7_0_OR_GREATER
+#if !NET7_0_OR_GREATER || NETSTANDARD ||NETFRAMEWORK
         if (argument is null or EmptyString)
         {
             ArgumentNullThrowHelper.ThrowIfNull(argument);
@@ -31,7 +31,7 @@ public static void ThrowIfNullOrEmpty([NotNull] string? argument, [CallerArgumen
 #endif
     }
 
-#if !NET7_0_OR_GREATER
+#if !NET7_0_OR_GREATER || NETSTANDARD ||NETFRAMEWORK
     [DoesNotReturn]
     internal static void Throw(string? paramName) =>
         throw new ArgumentException("The value cannot be an empty string.", paramName);

src/SignalR/common/SignalR.Common/src/Microsoft.AspNetCore.SignalR.Common.csproj

@@ -19,6 +19,7 @@
     <Compile Include="$(SignalRSharedSourceRoot)Utf8BufferTextWriter.cs" Link="Internal\Utf8BufferTextWriter.cs" />
     <Compile Include="$(SignalRSharedSourceRoot)ReusableUtf8JsonWriter.cs" Link="Internal\ReusableUtf8JsonWriter.cs" />
     <Compile Include="$(SharedSourceRoot)ThrowHelpers\ArgumentThrowHelper.cs" LinkBase="Shared" />
+    <Compile Include="$(SharedSourceRoot)ThrowHelpers\ArgumentNullThrowHelper.cs" LinkBase="Shared" />
     <Compile Include="$(SharedSourceRoot)CallerArgument\CallerArgumentExpressionAttribute.cs" LinkBase="Shared" />
   </ItemGroup>