本文介绍了修改现有对象使用新的部分JSON数据Json.NET的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧! 问题描述 29岁程序员,3月因学历无情被辞! 考虑下面的示例程序 VAR日历=新的日历 { n = 42, CoffeeProvider =Espresso2000,会议=新[] {新会议 {位置=室1,从= DateTimeOffset.Parse(2014-01-01T00:00:00Z),要= DateTimeOffset.Parse(2014-01-01T01:00:00Z)},新的会议 {位置=室2,从= DateTimeOffset.Parse(2014-01-01T02:00:00Z),要= DateTimeOffset.Parse( 2014-01-01T03:00:00Z)},} }; VAR补丁= @{'coffeeprovider':空,'会议':[ {'位置':'ROOM3', '从':'2014-01-01T04:00:00Z',',以':'2014-01-01T05:00:00Z'} ] }; VAR patchedCalendar =修补程序(日历,补丁); 的 修补程序()方法的结果应该等于日历除非补丁的改变。这意味着, 编号将保持不变, CoffeeProvider 将被设置为空和会议将包含位于ROOM3一个项目。 如何做一件创建一个一般修补程序()的方法,会为工作中所述的对象(而不仅仅是例如日历对象)通过 Json.NET deserializable? 如果(1)这是不可行的,这将是一些限制,将使可行以及如何将它实现? 解决方案 您想要的 JsonSerializer.Populate() : 填充JSON值到目标对象。 例如,这里正在更新你的日历实例类: 公共静态类TestPopulate {公共静态无效测试() { VAR日历=新的日历 { n = 42, CoffeeProvider =Espresso2000,会议=新[] {新会议 {位置=室1,从= DateTimeOffset.Parse(2014-01-01T00:00:00Z),要= DateTimeOffset.Parse(2014年-01-01T01:00:00Z)},新会议 {位置=室2,从= DateTimeOffset.Parse(2014- 01-01T02:00:00Z),要= DateTimeOffset.Parse(2014-01-01T03:00:00Z)},} }; VAR补丁= @{'coffeeprovider':空,'会议':[ {'位置':'ROOM3', '从':'2014-01-01T04:00:00Z',',以':'2014-01-01T05:00:00Z'} ] }; 修补程序(日历,补丁); 的Debug.WriteLine(JsonConvert.SerializeObject(日历,Formatting.Indented)); } 公共静态无效补丁< T>(T OBJ,串补丁) {无功序列化=新JsonSerializer();使用(VAR读卡器=新StringReader(补丁)) { serializer.Populate (读卡器,OBJ); } } } 和生产调试输出 {标识:42,coffeeprovider:空, 会议: {位置:ROOM3,,由:2014-01-01T04:00:00 + 00:00, 要:2014-01-01T05:00:00 + 00:00} ] } 更新 如果你想先复制,你可以这样做: 公共静态牛逼CopyPatch< T>(T OBJ,串补丁) {无功序列化=新JsonSerializer( ); VAR JSON = JsonConvert.SerializeObject(OBJ); VAR副本= JsonConvert.DeserializeObject< T>(JSON);使用(VAR读卡器=新StringReader(补丁)) { serializer.Populate(读卡器,复制) ; } 返回副本; } Consider the below example programvar calendar = new Calendar{ Id = 42, CoffeeProvider = "Espresso2000", Meetings = new[] { new Meeting { Location = "Room1", From = DateTimeOffset.Parse("2014-01-01T00:00:00Z"), To = DateTimeOffset.Parse("2014-01-01T01:00:00Z") }, new Meeting { Location = "Room2", From = DateTimeOffset.Parse("2014-01-01T02:00:00Z"), To = DateTimeOffset.Parse("2014-01-01T03:00:00Z") }, }};var patch = @"{ 'coffeeprovider': null, 'meetings': [ { 'location': 'Room3', 'from': '2014-01-01T04:00:00Z', 'to': '2014-01-01T05:00:00Z' } ] }";var patchedCalendar = Patch(calendar, patch);The result of the Patch() method should be equal to calendar except as changed by patch. That means; Id would be unchanged, CoffeeProvider would be set to null and Meetings would contain a single item located in Room3.How does one create a general Patch() method that will work forany object (not just the example Calendar object) deserializable byJson.NET?If (1) this is not feasible, what would be some restrictions that would make it feasible and how would it be implemented? 解决方案 You want JsonSerializer.Populate(): Populates the JSON values onto the target object.For instance, here it is updating an instance of your Calendar class:public static class TestPopulate{ public static void Test() { var calendar = new Calendar { Id = 42, CoffeeProvider = "Espresso2000", Meetings = new[] { new Meeting { Location = "Room1", From = DateTimeOffset.Parse("2014-01-01T00:00:00Z"), To = DateTimeOffset.Parse("2014-01-01T01:00:00Z") }, new Meeting { Location = "Room2", From = DateTimeOffset.Parse("2014-01-01T02:00:00Z"), To = DateTimeOffset.Parse("2014-01-01T03:00:00Z") }, } }; var patch = @"{ 'coffeeprovider': null, 'meetings': [ { 'location': 'Room3', 'from': '2014-01-01T04:00:00Z', 'to': '2014-01-01T05:00:00Z' } ]}"; Patch(calendar, patch); Debug.WriteLine(JsonConvert.SerializeObject(calendar, Formatting.Indented)); } public static void Patch<T>(T obj, string patch) { var serializer = new JsonSerializer(); using (var reader = new StringReader(patch)) { serializer.Populate(reader, obj); } }}And the debug output produced is:{ "id": 42, "coffeeprovider": null, "meetings": [ { "location": "Room3", "from": "2014-01-01T04:00:00+00:00", "to": "2014-01-01T05:00:00+00:00" } ]}UpdateIf you want to copy first, you could do: public static T CopyPatch<T>(T obj, string patch) { var serializer = new JsonSerializer(); var json = JsonConvert.SerializeObject(obj); var copy = JsonConvert.DeserializeObject<T>(json); using (var reader = new StringReader(patch)) { serializer.Populate(reader, copy); } return copy; } 这篇关于修改现有对象使用新的部分JSON数据Json.NET的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持! 上岸,阿里云! 09-02 11:36