应vs提示修改

FastGithub.DomainResolve/DomainResolver.cs

@@ -82,7 +82,7 @@ namespace FastGithub.DomainResolve
             var semaphore = this.semaphoreSlims.GetOrAdd(domain, _ => new SemaphoreSlim(1, 1));
             try
             {
-                await semaphore.WaitAsync();
+                await semaphore.WaitAsync(CancellationToken.None);
                 return await this.ResolveCoreAsync(domain, cancellationToken);
             }
             finally

FastGithub.HttpServer/RequestLoggingMilldeware.cs

@@ -95,7 +95,7 @@ namespace FastGithub.HttpServer
             while (ex != null)
             {
                 var type = ex.GetType();
-                builder.Append(type.Namespace).Append(".").Append(type.Name).Append(": ").AppendLine(ex.Message);
+                builder.Append(type.Namespace).Append('.').Append(type.Name).Append(": ").AppendLine(ex.Message);
                 ex = ex.InnerException;
             }
             return builder.ToString();