修复 SQLiteHelper.SQLiteDbContext 当表没有数据 FreeID 出错

Project.SQLiteHelper/SQLiteHelper/SQLiteDbContext.cs

@@ -88,7 +88,10 @@ namespace SQLite
         {
             string cmd = $"SELECT MAX(ID) FROM {tablename}";
             var reponse = sqliteHelper.ExecuteScalar(cmd);
-            return System.Convert.ToInt64(reponse) + 1;
+            if (reponse is DBNull)
+                return 0;
+            else
+                return System.Convert.ToInt64(reponse) + 1;
 
         }
 

Project.SQLiteHelper/UnitTestProject1/UnitTest1.cs

@@ -131,5 +131,7 @@ namespace UnitTestProject1
             }
             Assert.IsNull(ex);
         }
+
+        
     }
 }