扩展object方法，为null时排除异常

Falcon.SugarApi.Test/ObjectExtendTest.cs

@@ -41,6 +41,16 @@ namespace Falcon.SugarApi.Test
             Console.WriteLine(t.GetType().FullName);
             Assert.IsTrue(t.GetType().Equals(typeof(int)));
         }
+        /// <summary>
+        /// 测试对象为null则会抛出异常
+        /// </summary>
+        [TestMethod]
+        public void ThrowNullExceptionWhenNullTest() {
+            var obj = new object();
+            obj.ThrowNullExceptionWhenNull();
+            obj = null;
+            Assert.ThrowsException<ArgumentNullException>(() => obj.ThrowNullExceptionWhenNull());
+        }
     }
 
     public class SourceClass

Falcon.SugarApi/ObjectExtend.cs

@@ -24,7 +24,7 @@ namespace Falcon.SugarApi
                       select new { s, t };
             foreach (var item in all) {
                 //item.t.SetValue(target, Convert.ChangeType(item.s.GetValue(source), item.t.PropertyType));
-                item.t.SetValue(target,item.s.GetValue(source).ChangeType(item.t.PropertyType));
+                item.t.SetValue(target, item.s.GetValue(source).ChangeType(item.t.PropertyType));
             }
             return source;
         }
@@ -47,11 +47,11 @@ namespace Falcon.SugarApi
         /// <param name="source">原对象</param>
         /// <param name="targetType">目标类型</param>
         /// <returns>转换后的类型</returns>
-        public static object? ChangeType(this object? source,Type targetType) {
+        public static object? ChangeType(this object? source, Type targetType) {
             if (targetType == null) {
                 throw new ArgumentNullException("targetType");
             }
-            if (source==null) {
+            if (source == null) {
                 return null;
             }
             if (targetType.IsGenericType && targetType.GetGenericTypeDefinition().Equals(typeof(Nullable<>))) {
@@ -60,5 +60,18 @@ namespace Falcon.SugarApi
             }
             return Convert.ChangeType(source, targetType);
         }
+
+        /// <summary>
+        /// 如果对象为null则抛出异常
+        /// </summary>
+        /// <param name="obj">检测对象</param>
+        /// <returns>对象本身</returns>
+        /// <exception cref="ArgumentNullException">对象为null</exception>
+        public static object? ThrowNullExceptionWhenNull(this object? obj) {
+            if (obj == null) {
+                throw new ArgumentNullException();
+            }
+            return obj;
+        }
     }
 }