diff --git a/Infrastructure/Infrastructure.csproj b/Infrastructure/Infrastructure.csproj
index 0788b5b7..a68a3688 100644
--- a/Infrastructure/Infrastructure.csproj
+++ b/Infrastructure/Infrastructure.csproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+      <TargetFrameworks>net5.0</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(MSBuildVersion)' &gt;= '17.0' ">$(TargetFrameworks);net6.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
diff --git a/OpenAuth.App/OpenAuth.App.csproj b/OpenAuth.App/OpenAuth.App.csproj
index facf853e..ddd84984 100644
--- a/OpenAuth.App/OpenAuth.App.csproj
+++ b/OpenAuth.App/OpenAuth.App.csproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+      <TargetFrameworks>net5.0</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(MSBuildVersion)' &gt;= '17.0' ">$(TargetFrameworks);net6.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
diff --git a/OpenAuth.Identity/OpenAuth.IdentityServer.csproj b/OpenAuth.Identity/OpenAuth.IdentityServer.csproj
index ab5fdc93..116e0ba5 100644
--- a/OpenAuth.Identity/OpenAuth.IdentityServer.csproj
+++ b/OpenAuth.Identity/OpenAuth.IdentityServer.csproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+      <TargetFrameworks>net5.0</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(MSBuildVersion)' &gt;= '17.0' ">$(TargetFrameworks);net6.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
diff --git a/OpenAuth.Mvc/OpenAuth.Mvc.csproj b/OpenAuth.Mvc/OpenAuth.Mvc.csproj
index 91bb8e02..3cfd2f4d 100644
--- a/OpenAuth.Mvc/OpenAuth.Mvc.csproj
+++ b/OpenAuth.Mvc/OpenAuth.Mvc.csproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+      <TargetFrameworks>net5.0</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(MSBuildVersion)' &gt;= '17.0' ">$(TargetFrameworks);net6.0</TargetFrameworks>
     <UseRazorBuildServer>false</UseRazorBuildServer>
   </PropertyGroup>
 
diff --git a/OpenAuth.Repository/OpenAuth.Repository.csproj b/OpenAuth.Repository/OpenAuth.Repository.csproj
index 05fff002..5fde6199 100644
--- a/OpenAuth.Repository/OpenAuth.Repository.csproj
+++ b/OpenAuth.Repository/OpenAuth.Repository.csproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+      <TargetFrameworks>net5.0</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(MSBuildVersion)' &gt;= '17.0' ">$(TargetFrameworks);net6.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
diff --git a/OpenAuth.Repository/SqlSugarRepository.cs b/OpenAuth.Repository/SqlSugarRepository.cs
index b1d30b25..0d2dde0a 100644
--- a/OpenAuth.Repository/SqlSugarRepository.cs
+++ b/OpenAuth.Repository/SqlSugarRepository.cs
@@ -1,16 +1,17 @@
-using System.Collections.Generic;
-using SqlSugar;
+using SqlSugar;
 
-namespace OpenAuth.Repository;
-
-/// <summary>
-/// SqlSugar仓储
-/// <para>具体用法参考：https://www.donet5.com/Home/Doc?typeId=1228</para>
-/// </summary>
-public class SqlSugarRepository<T>: SimpleClient<T> where T : class, new()
+namespace OpenAuth.Repository
 {
-    public SqlSugarRepository(ISqlSugarClient client)
-    {          
-        base.Context=client; 
+    /// <summary>
+    /// SqlSugar仓储
+    /// <para>具体用法参考：https://www.donet5.com/Home/Doc?typeId=1228</para>
+    /// </summary>
+    public class SqlSugarRepository<T> : SimpleClient<T> where T : class, new()
+    {
+        public SqlSugarRepository(ISqlSugarClient client)
+        {
+            base.Context = client;
+        }
     }
-}
\ No newline at end of file
+}
+
diff --git a/OpenAuth.WebApi/OpenAuth.WebApi.csproj b/OpenAuth.WebApi/OpenAuth.WebApi.csproj
index 4e00f6e5..2c7217b3 100644
--- a/OpenAuth.WebApi/OpenAuth.WebApi.csproj
+++ b/OpenAuth.WebApi/OpenAuth.WebApi.csproj
@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+      <TargetFrameworks>net5.0</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(MSBuildVersion)' &gt;= '17.0' ">$(TargetFrameworks);net6.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">