修改一版

2022-07-04 11:34:11 +08:00
parent 5a9a6d74d4
commit f7963eebd8
7 changed files with 282 additions and 23 deletions
@@ -0,0 +1,34 @@
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.EntityFrameworkCore;
+using System.Linq.Dynamic.Core;
+
+namespace IRaCIS.Core.Infrastructure.Extention
+{
+    public static class IQueryableExtensions
+    {
+       /// <summary>
+       /// 获取第一条 null提示
+       /// </summary>
+       /// <typeparam name="TSource"></typeparam>
+       /// <param name="source"></param>
+       /// <returns></returns>
+       /// <exception cref="QueryBusinessObjectNotExistException"></exception>
+        public  static async Task<TSource> FirstNotNullAsync<TSource>(this IQueryable<TSource> source)
+        {
+            var result =await source.FirstOrDefaultAsync();
+
+            if (result == null)
+            {
+                throw new QueryBusinessObjectNotExistException($"The query object does not exist in database, Please check the query parameters");
+            }
+            else
+            {
+                return result;
+            }
+        }
+
+
+    }
+}