前言
autowrapper是一个简单可自定义全局异常处理程序和asp.net core api响应的包装。他使用asp.net core middleware拦截传入的http请求，并将最后的结果使用统一的格式来自动包装起来.目的主要是让我们更多的关注业务特定的代码要求，并让包装器自动处理http响应。这可以在构建api时加快开发时间，同时为http响应试试我们统一的标准。
安装
autowrapper.core从nuget或通过cli下载并安装
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pm> install-package autowrapper.core |
在startup.cs configure方法中注册以下内容，但是切记要放在userouting前
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app.useapiresponseandexceptionwrapper(); |
启动属性映射
默认情况下autowrapper将在成功请求成功时输出以下格式：
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{ "message": "request successful.", "iserror": false, "result": [ { "id": 7002, "firstname": "vianne", "lastname": "durano", "dateofbirth": "2018-11-01t00:00:00" } ]} |
如果说不喜欢默认属性命名方式，那么我们可以通过autowrapperpropertymap属性进行映射为我们需要指定的任何名称。例如我么可以将result属性的名称更改为data。如下所示
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public class mapresponseobject { [autowrapperpropertymap(prop.result)] public object data { get; set; }} |
然后将mapresponseobject类传递给autpwrapper middleware
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app.useapiresponseandexceptionwrapper<mapresponseobject>(); |
通过映射重新请求后，现在影响格式如下所示
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{ "message": "request successful.", "iserror": false, "data": { "id": 7002, "firstname": "vianne", "lastname": "durano", "dateofbirth": "2018-11-01t00:00:00" }} |
可以从中看出result属性已经更换为data属性了
默认情况下autowrapper发生异常时将吐出以下响应格式
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{ "iserror": true, "responseexception": { "exceptionmessage": "unhandled exception occurred. unable to process the request." }} |
而且如果在autowrapperoptions中设置了isdebug，则将产生带有堆栈跟踪信息的类似信息
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{ "iserror": true, "responseexception": { "exceptionmessage": " input string was not in a correct format.", "details": " at system.number.throwoverfloworformatexception(parsingstatus status, typecode type)\r\n at system.number.parseint32(readonlyspan`1 value, numberstyles styles, numberformatinfo info)\r\n …" }} |
如果想将某些apierror属性名称更改为其他名称，只需要在以下代码中添加以下映射mapresponseobject
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public class mapresponseobject { [autowrapperpropertymap(prop.responseexception)] public object error { get; set; } [autowrapperpropertymap(prop.responseexception_exceptionmessage)] public string message { get; set; } [autowrapperpropertymap(prop.responseexception_details)] public string stacktrace { get; set; }} |
通过如下代码来模拟错误
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int num = convert.toint32("10s"); |
现在映射后的输出如下所示
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{ "iserror": true, "error": { "message": " input string was not in a correct format.", "stacktrace": " at system.number.throwoverfloworformatexception(parsingstatus status, typecode type)\r\n at system.number.parseint32(readonlyspan`1 value, numberstyles styles, numberformatinfo info)\r\n …" }} |
请注意apierror现在根据mapresponseobject类中定义的属性更改了模型的默认属性。
我们可以自由的选择映射任何属性，下面是映射属性相对应的列表
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[autowrapperpropertymap(prop.version)][autowrapperpropertymap(prop.statuscode)][autowrapperpropertymap(prop.message)][autowrapperpropertymap(prop.iserror)][autowrapperpropertymap(prop.result)][autowrapperpropertymap(prop.responseexception)][autowrapperpropertymap(prop.responseexception_exceptionmessage)][autowrapperpropertymap(prop.responseexception_details)][autowrapperpropertymap(prop.responseexception_referenceerrorcode)][autowrapperpropertymap(prop.responseexception_referencedocumentlink)][autowrapperpropertymap(prop.responseexception_validationerrors)][autowrapperpropertymap(prop.responseexception_validationerrors_field)][autowrapperpropertymap(prop.responseexception_validationerrors_message)] |
自定义错误架构
autowrapper还提供了一个apiexception可用于定义自己的异常的对象，如果想抛出自己的异常消息，则可以简单地执行以下操作
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throw new apiexception("error blah", 400, "511", "http://blah.com/error/511"); |
默认输出格式如下所示
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{ "iserror": true, "responseexception": { "exceptionmessage": "error blah", "referenceerrorcode": "511", "referencedocumentlink": "http://blah.com/error/511" }} |
当然我们可以自定义错误格式
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public class mapresponseobject { [autowrapperpropertymap(prop.responseexception)] public object error { get; set; }}public class error { public string message { get; set; } public string code { get; set; } public innererror innererror { get; set; } public error(string message, string code, innererror inner) { this.message = message; this.code = code; this.innererror = inner; }}public class innererror { public string requestid { get; set; } public string date { get; set; } public innererror(string reqid, string reqdate) { this.requestid = reqid; this.date = reqdate; }} |
然后我们可以通过如下代码进行引发我们错误
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throw new apiexception( new error("an error blah.", "invalidrange", new innererror("12345678", datetime.now.toshortdatestring()))); |
输出格式如下所示
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{ "iserror": true, "error": { "message": "an error blah.", "code": "invalidrange", "innererror": { "requestid": "12345678", "date": "10/16/2019" } }} |
使用自定义api响应格式
如果映射满足不了我们的需求。并且我们需要向api响应模型中添加其他属性，那么我们现在可以自定义自己的格式类，通过设置usecustomschema为true来实现，代码如下所示
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app.useapiresponseandexceptionwrapper(new autowrapperoptions { usecustomschema = true }); |
现在假设我们想在主api中响应中包含一个属性sentdate和pagination对象，我们可能希望将api响应模型定义为以下格式
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public class mycustomapiresponse { public int code { get; set; } public string message { get; set; } public object payload { get; set; } public datetime sentdate { get; set; } public pagination pagination { get; set; } public mycustomapiresponse(datetime sentdate, object payload = null, string message = "", int statuscode = 200, pagination pagination = null) { this.code = statuscode; this.message = message == string.empty ? "success" : message; this.payload = payload; this.sentdate = sentdate; this.pagination = pagination; } public mycustomapiresponse(datetime sentdate, object payload = null, pagination pagination = null) { this.code = 200; this.message = "success"; this.payload = payload; this.sentdate = sentdate; this.pagination = pagination; } public mycustomapiresponse(object payload) { this.code = 200; this.payload = payload; }}public class pagination { public int totalitemscount { get; set; } public int pagesize { get; set; } public int currentpage { get; set; } public int totalpages { get; set; }} |
通过如下代码片段进行测试结果
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public async task<mycustomapiresponse> get() { var data = await _personmanager.getallasync(); return new mycustomapiresponse(datetime.utcnow, data, new pagination { currentpage = 1, pagesize = 10, totalitemscount = 200, totalpages = 20 });} |
运行后会得到如下影响格式
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{ "code": 200, "message": "success", "payload": [ { "id": 1, "firstname": "vianne", "lastname": "durano", "dateofbirth": "2018-11-01t00:00:00" }, { "id": 2, "firstname": "vynn", "lastname": "durano", "dateofbirth": "2018-11-01t00:00:00" }, { "id": 3, "firstname": "mitch", "lastname": "durano", "dateofbirth": "2018-11-01t00:00:00" } ], "sentdate": "2019-10-17t02:26:32.5242353z", "pagination": { "totalitemscount": 200, "pagesize": 10, "currentpage": 1, "totalpages": 20 }} |
但是从这里要注意一旦我们对api响应进行自定义，那么就代表我们完全控制了要格式化数据的方式，同时丢失了默认api响应的某些选项配置。但是我们仍然可以利用apiexception()方法引发用户定义的错误消息
如下所示
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[route("{id:long}")][httpput]public async task<mycustomapiresponse> put(long id, [frombody] persondto dto) { if (modelstate.isvalid) { try { var person = _mapper.map<person>(dto); person.id = id; if (await _personmanager.updateasync(person)) return new mycustomapiresponse(datetime.utcnow, true, "update successful."); else throw new apiexception($"record with id: {id} does not exist.", 400); } catch (exception ex) { _logger.log(loglevel.error, ex, "error when trying to update with id:{@id}", id); throw; } } else throw new apiexception(modelstate.allerrors());} |
现在当进行模型验证时，可以获得默认响应格式
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{ "iserror": true, "responseexception": { "exceptionmessage": "request responded with validation error(s). please correct the specified validation errors and try again.", "validationerrors": [ { "field": "firstname", "message": "'first name' must not be empty." } ] }} |
reference
https://github.com/proudmonkey/autowrapper
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原文链接：https://www.cnblogs.com/yyfh/p/12602087.html
