From a56288753c94e681cf010a1f1bc50b73cb0a56f0 Mon Sep 17 00:00:00 2001
From: maliming <malimings@gmail.com>
Date: Sat, 29 Jul 2023 10:02:27 +0800
Subject: [PATCH] Update AbpCorrelationIdMiddleware.cs

---
 .../Abp/AspNetCore/Tracing/AbpCorrelationIdMiddleware.cs     | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/framework/src/Volo.Abp.AspNetCore/Volo/Abp/AspNetCore/Tracing/AbpCorrelationIdMiddleware.cs b/framework/src/Volo.Abp.AspNetCore/Volo/Abp/AspNetCore/Tracing/AbpCorrelationIdMiddleware.cs
index de93914d71..a5f954c260 100644
--- a/framework/src/Volo.Abp.AspNetCore/Volo/Abp/AspNetCore/Tracing/AbpCorrelationIdMiddleware.cs
+++ b/framework/src/Volo.Abp.AspNetCore/Volo/Abp/AspNetCore/Tracing/AbpCorrelationIdMiddleware.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Options;
 using System.Threading.Tasks;
@@ -29,9 +30,9 @@ public class AbpCorrelationIdMiddleware : IMiddleware, ITransientDependency
         }
     }
 
-    protected virtual string GetCorrelationIdFromRequest(HttpContext context)
+    protected virtual string? GetCorrelationIdFromRequest(HttpContext context)
     {
-        string correlationId = context.Request.Headers[_options.HttpHeaderName];
+        var correlationId = context.Request.Headers[_options.HttpHeaderName];
         if (correlationId.IsNullOrEmpty())
         {
             correlationId = Guid.NewGuid().ToString("N");