update:重复创建也返回成功

创建时可直接返回二维码

QRCodeService/Application/Commands/CreateLinkCommandHandler.cs

@@ -2,6 +2,7 @@
 using Domain.AggregateModel.LinkAggregate;
 using Domain.Exceptions;
 using MediatR;
+using Microsoft.Extensions.Logging;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -13,16 +14,19 @@ namespace QRCodeService.Application.Commands
 {
     public class CreateLinkCommandHandler : IRequestHandler<CreateLinkCommand, Link>
     {
+
+        readonly ILogger<CreateLinkCommandHandler> logger;
         readonly IAppRepository appRepository;
         readonly ILinkRepository linkRepository;
 
-        public CreateLinkCommandHandler(ILinkRepository linkRepository, IAppRepository appRepository)
+        public CreateLinkCommandHandler(ILinkRepository linkRepository, IAppRepository appRepository, ILogger<CreateLinkCommandHandler> logger)
         {
             this.linkRepository = linkRepository;
             this.appRepository = appRepository;
+            this.logger = logger;
         }
 
-         async Task<Link> IRequestHandler<CreateLinkCommand, Link>.Handle(CreateLinkCommand request, CancellationToken cancellationToken)
+        async Task<Link> IRequestHandler<CreateLinkCommand, Link>.Handle(CreateLinkCommand request, CancellationToken cancellationToken)
         {
             var app =  await appRepository.GetAsync(request.AppId);
             if (app == null)
@@ -33,7 +37,8 @@ namespace QRCodeService.Application.Commands
             var dbLink = await linkRepository.GetAsync(link.ShortCode);
             if (dbLink != null)
             {
-                throw new DomainException("url has been registed");
+                logger.LogDebug("use exist link");
+                return dbLink;
             }
             link = linkRepository.Add(link);
             await linkRepository.UnitOfWork.SaveEntitiesAsync();