新增对象是否为null的检测方法IsNull和IsNotNull

Falcon.SugarApi.Test/ObjectExtendTest.cs

@@ -87,6 +87,28 @@ namespace Falcon.SugarApi.Test
                 }
             }
         }
+
+        /// <summary>
+        /// 是否为空测试
+        /// </summary>
+        [TestMethod]
+        public void IsNullTest() {
+            object obj = null;
+            Assert.IsTrue(obj.IsNull());
+            Assert.IsFalse(obj.IsNotNull());
+
+            obj=new object();
+            Assert.IsTrue(obj.IsNotNull());
+            Assert.IsFalse(obj.IsNull());
+
+            object? obj1 = null;
+            Assert.IsTrue(obj1.IsNull());
+            Assert.IsFalse(obj1.IsNotNull());
+
+            obj1=new object();
+            Assert.IsTrue(obj1.IsNotNull());
+            Assert.IsFalse(obj1.IsNull());
+        }
     }
     /// <summary>
     /// 扩展属性测试类

Falcon.SugarApi/ObjectExtend.cs

@@ -90,6 +90,20 @@ namespace Falcon.SugarApi
                 };
             }
         }
+
+        /// <summary>
+        /// 对象是否为null
+        /// </summary>
+        /// <param name="obj">要测试的对象</param>
+        /// <returns>True表示对象为null，否则不为null</returns>
+        public static bool IsNull([AllowNull] this object obj) => obj==null;
+
+        /// <summary>
+        /// 对象是否不为null。与IsNull相反
+        /// </summary>
+        /// <param name="obj">要测试的对象</param>
+        /// <returns>True表示对象不为null，否则为null</returns>
+        public static bool IsNotNull([AllowNull] this object obj) => !obj.IsNull();
     }
 
     /// <summary>