修改问题

src/0-core/HuanMeng.DotNetCore/MiddlewareExtend/SignMiddleware.cs

@@ -31,6 +31,11 @@ namespace HuanMeng.DotNetCore.MiddlewareExtend
             var requestBody = await new StreamReader(context.Request.Body).ReadToEndAsync();
             context.Request.Body.Position = 0; // 重置请求体的位置
 
+            if (string.IsNullOrEmpty(requestBody))
+            {
+                await _next(context);
+                return;
+            }
             // 解析请求体为 JSON 对象
             var requestJson = JObject.Parse(requestBody);
             // 获取请求中的 sign 值

src/0-core/HuanMeng.Utility/HuanMeng.Utility.csproj

@@ -1,7 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard2.1</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>