Fixes

framework/src/Volo.Abp.Core/System/Linq/PredicateOperator.cs

@@ -213,12 +213,12 @@ public class ExpressionStarter<T>
     }
 #endif
 
-#if !(NET35 || WINDOWS_APP || NETSTANDARD || PORTABLE || PORTABLE40 || UAP)
-        /// <summary></summary>
-        public Func<T, bool> Compile(DebugInfoGenerator debugInfoGenerator) { return Predicate.Compile(debugInfoGenerator); }
+#if !(NET35 || WINDOWS_APP || NETSTANDARD || NET5_0 || PORTABLE || PORTABLE40 || UAP)
+    /// <summary></summary>
+    public Func<T, bool> Compile(DebugInfoGenerator debugInfoGenerator) { return Predicate.Compile(debugInfoGenerator); }
 
-        /// <summary></summary>
-        public Expression<Func<T, bool>> Update(Expression body, IEnumerable<ParameterExpression> parameters) { return Predicate.Update(body, parameters); }
+    /// <summary></summary>
+    public Expression<Func<T, bool>> Update(Expression body, IEnumerable<ParameterExpression> parameters) { return Predicate.Update(body, parameters); }
 #endif
 
     #endregion

framework/src/Volo.Abp.Core/Volo.Abp.Core.csproj

@@ -32,9 +32,7 @@
     <PackageReference Include="System.Linq.Queryable" />
     <PackageReference Include="JetBrains.Annotations" />
     <PackageReference Include="Nito.AsyncEx.Context" />
-  </ItemGroup>
-  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0' Or '$(TargetFramework)' == 'netstandard2.1'">
-    <PackageReference Include="System.Threading.Tasks.Extensions" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net5.0'))" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFrameworkIdentifier)' == '.NETStandard' And $([MSBuild]::VersionGreaterThanOrEquals($(TargetFrameworkVersion), '2.1')) ">
     <PackageReference Include="System.ComponentModel.Annotations" />