前言
本篇幅会专门记录在工作中实际碰到的问题场景，和一些比较好的实现方法作为汇总，可以供各位借鉴和参考，当然 本人入行不深，能力有限，仅供各位借鉴和参考。欢迎补充
技巧一:引入其他项目类库文件
做项目大家都知道会有远程请求API的情况，现在假设做API的项目你能接触到并且Git下来。那么继续往下看。
将API项目中用到的Dto引入自己项目。这样方便我们将请求到的json字符串直接序列化成dto，然后再转成我们自己需要的ViewModel，具体怎么转呢，往下看：
技巧二:使用Extension
使用Extension，具体怎么用，我们来用一个实际例子说一下吧。比如，我们现在要请求一个所有俱乐部的api。首先我们定义一个ViewModel用于存放俱乐部信息，Model如下：
①定义ViewModel
public class ClubBase ???{ ???????/// <summary> ???????/// 主键Id ???????/// </summary> ???????public long Id { get; set; } ???????/// <summary> ???????/// 俱乐部名称 ???????/// </summary> ???????public string Name { get; set; } ???????/// <summary> ???????/// 俱乐部描述 ???????/// </summary> ???????public string Description { get; set; } ???????/// <summary> ???????/// 创始人 ???????/// </summary> ???????public string Creator { get; set; } ???????/// <summary> ???????/// 创建年份 ???????/// </summary> ???????public int Year { get; set; } ???????/// <summary> ???????/// 其他信息 ???????/// </summary> ???????public string Contactor { get; set; } ???????/// <summary> ???????/// 手机号 ???????/// </summary> ???????public string Phone { get; set; } ???????/// <summary> ???????/// 地址 例如 中国/深圳 ???????/// </summary> ???????public string Address { get; set; } ???????/// <summary> ???????/// 日期 ???????/// </summary> ???????public DateTime CreationDate { get; set; } ???}②编写接口
???/// <summary> ???/// 所有接口信息 ???/// </summary> ???public interface IDataServices ???{ ???????/// <summary> ???????/// 获取所有俱乐部 ???????/// </summary> ???????/// <returns></returns> ???????Task<IList<ClubBase>> GetClubs(); ???}③实现Server接口
???/// <summary> ???/// 接口实现类 动态请求api获取相应数据 ???/// </summary> ???public class DataServices: IDataServices ???{ ???????private readonly IDataHttpServers _dataHttpServers; ???????public DataServices(IDataHttpServers dataHttpServers) ???????{ ???????????_dataHttpServers = dataHttpServers; ???????} ???????public async Task<IList<ClubBase>> GetClubs() ???????{ ???????????var clubsModelList = await _dataHttpServers.GetClubs(); ???????????return clubsModelList; ???????} ???}④编写Http请求接口
public interface IDataHttpServers ???{ ???????/// <summary> ???????/// 获取所有俱乐部 ???????/// </summary> ???????/// <returns></returns> ???????Task<IList<ClubBase>> GetClubs(); ???}⑤实现此接口
???????/// <summary> ???????/// 返回俱乐部列表 ???????/// </summary> ???????/// <returns></returns> ???????public async Task<IList<ClubBase>> GetClubs() ???????{ ???????????return await Task.Run(() => GetClubApi()); ???????} ??? /// <summary> ???????/// 获取所有俱乐部API ???????/// </summary> ???????/// <returns></returns> ???????public List<ClubBase> GetClubApi() ???????{ ???????????var list = HttpHelper.GetApi<string>("getclub"); ???????????List<ClubBase> viewClubList = new List<ClubBase>(); ???????????try ???????????{ ???????????????List<ClubInfoDto> apiClubList = JsonConvert.DeserializeObject<List<ClubInfoDto>>(list); ???????????????foreach (var item in apiClubList) ???????????????{ ???????????????????//调用拓展方法解耦dto于ViewModel的赋值操作 ???????????????????var club = item.TranslateToClubBaseViewModel(); ???????????????????viewClubList.Add(club); ???????????????} ???????????} ???????????catch (Exception e) ???????????{ ???????????????//请求接口api异常，异常描述 list ???????????} ???????????return viewClubList; ???????}重头戏也就是此方法了，其中 可以将请求api单独抽离出来写成泛型方法，此处是这样抽离的：
/// <summary> ???/// HTTPclient 泛型抽象类 ???/// </summary> ???public static class HttpHelper ???{ ???????public static T GetApi<T>(string apiName, string pragm = "") ???????{ ???????????var client = new RestSharpClient($"{SiteConfig.GetSite("Url")}"); ???????????var request = client.Execute(string.IsNullOrEmpty(pragm) ???????????????? new RestRequest($"{SiteConfig.GetSite($"{apiName}")}", Method.GET) ???????????????: new RestRequest($"{SiteConfig.GetSite($"{apiName}")}/{pragm}", Method.GET)); ???????????if (request.StatusCode != HttpStatusCode.OK) ???????????{ ???????????????return ?(T)Convert.ChangeType(request.ErrorMessage, typeof(T)); ???????????} ???????????T result = (T)Convert.ChangeType(request.Content, typeof(T)); ???????????return result; ???????} ???}这里我请求API是使用的RestSharp提供的请求方法。具体可以看这儿 RestSharp ，需要NuGet安装RestSharp
这里我稍微贴一下 大概常用的一些接口方法：
1）接口
/// <summary> ???/// API请求执行者接口 ???/// </summary> ???public interface IRestSharp ???{ ???????/// <summary> ???????/// 同步执行方法 ???????/// </summary> ???????/// <param name="request"></param> ???????/// <returns></returns> ???????IRestResponse Execute(IRestRequest request); ???????/// <summary> ???????/// 同步执行方法 ???????/// </summary> ???????/// <typeparam name="T">返回值</typeparam> ???????/// <param name="request">请求参数</param> ???????/// <returns></returns> ???????T Execute<T>(IRestRequest request) where T : new(); ???????/// <summary> ???????/// 异步执行方法 ???????/// </summary> ???????/// <param name="request">请求参数</param> ???????/// <param name="callback"></param> ???????/// <returns></returns> ???????RestRequestAsyncHandle ExecuteAsync(IRestRequest request, Action<IRestResponse> callback); ???????/// <summary> ???????/// 异步执行方法 ???????/// </summary> ???????/// <typeparam name="T"></typeparam> ???????/// <param name="request"></param> ???????/// <param name="callback"></param> ???????/// <returns></returns> ???????RestRequestAsyncHandle ExecuteAsync<T>(IRestRequest request, Action<IRestResponse<T>> callback) where T : new(); ???}2）实现
/// <summary> ????/// Rest接口执行者 ????/// </summary> ????public class RestSharpClient : IRestSharp ????{ ????????/// <summary> ????????/// 请求客户端 ????????/// </summary> ????????private RestClient client; ?????????/// <summary> ????????/// 接口基地址 格式：http://www.xxx.com/ ????????/// </summary> ????????private string BaseUrl { get; set; } ?????????/// <summary> ????????/// 默认的时间参数格式 ????????/// </summary> ????????private string DefaultDateParameterFormat { get; set; } ?????????/// <summary> ????????/// 默认验证器 ????????/// </summary> ????????private IAuthenticator DefaultAuthenticator { get; set; } ?????????/// <summary> ????????/// 构造函数 ????????/// </summary> ????????/// <param name="baseUrl"></param> ????????/// <param name="authenticator"></param> ????????public RestSharpClient(string baseUrl, IAuthenticator authenticator = null) ????????{ ????????????BaseUrl = baseUrl; ????????????client = new RestClient(BaseUrl); ????????????DefaultAuthenticator = authenticator; ?????????????//默认时间显示格式 ????????????DefaultDateParameterFormat = "yyyy-MM-dd HH:mm:ss"; ?????????????//默认校验器 ????????????if (DefaultAuthenticator != null) ????????????{ ????????????????client.Authenticator = DefaultAuthenticator; ????????????} ????????} ?????????/// <summary> ????????/// 通用执行方法 ????????/// </summary> ????????/// <param name="request">请求参数</param> ????????/// <remarks> ????????/// 调用实例： ????????/// var client = new RestSharpClient("http://localhost:82/"); ????????/// var result = client.Execute(new RestRequest("api/values", Method.GET)); ????????/// var content = result.Content;//返回的字符串数据 ????????/// </remarks> ????????/// <returns></returns> ????????public IRestResponse Execute(IRestRequest request) ????????{ ????????????request.DateFormat = string.IsNullOrEmpty(request.DateFormat) ? DefaultDateParameterFormat : request.DateFormat; ????????????var response = client.Execute(request); ????????????return response; ????????} ?????????/// <summary> ????????/// 同步执行方法 ????????/// </summary> ????????/// <typeparam name="T">返回的泛型对象</typeparam> ????????/// <param name="request">请求参数</param> ????????/// <remarks> ????????/// ?var client = new RestSharpClient("http://localhost:82/"); ????????/// ?var result = client.Execute<List<string>>(new RestRequest("api/values", Method.GET)); ?????????/// </remarks> ????????/// <returns></returns> ????????public T Execute<T>(IRestRequest request) where T : new() ????????{ ?????????????request.DateFormat = string.IsNullOrEmpty(request.DateFormat) ? DefaultDateParameterFormat : request.DateFormat; ?????????????var response = client.Execute<T>(request); ?????????????return response.Data; ?????????} ?????????/// <summary> ????????/// 异步执行方法 ????????/// </summary> ????????/// <param name="request">请求参数</param> ????????/// <param name="callback">回调函数</param> ????????/// <remarks> ????????/// 调用实例： ????????/// var client = new RestSharpClient("http://localhost:62981/"); ????????/// client.ExecuteAsync<List<string>>(new RestRequest("api/values", Method.GET), result => ????????/// { ????????/// ?????var content = result.Content;//返回的字符串数据 ????????/// }); ????????/// </remarks> ????????/// <returns></returns> ????????public RestRequestAsyncHandle ExecuteAsync(IRestRequest request, Action<IRestResponse> callback) ????????{ ????????????request.DateFormat = string.IsNullOrEmpty(request.DateFormat) ? DefaultDateParameterFormat : request.DateFormat; ????????????return client.ExecuteAsync(request, callback); ????????} ?????????/// <summary> ????????/// 异步执行方法 ????????/// </summary> ????????/// <typeparam name="T">返回的泛型对象</typeparam> ????????/// <param name="request">请求参数</param> ????????/// <param name="callback">回调函数</param> ????????/// <remarks> ????????/// 调用实例： ????????/// var client = new RestSharpClient("http://localhost:62981/"); ????????/// client.ExecuteAsync<List<string>>(new RestRequest("api/values", Method.GET), result => ????????/// { ????????/// ?????if (result.StatusCode != HttpStatusCode.OK) ????????/// ?????{ ????????/// ????????return; ????????/// ?????} ????????/// ?????var data = result.Data;//返回数据 ????????/// }); ????????/// </remarks> ????????/// <returns></returns> ?????????????????public RestRequestAsyncHandle ExecuteAsync<T>(IRestRequest request, Action<IRestResponse<T>> callback) where T : new() ????????{ ???????????request.DateFormat = string.IsNullOrEmpty(request.DateFormat) ? DefaultDateParameterFormat : request.DateFormat; ???????????return client.ExecuteAsync<T>(request, callback); ???????} ????}好了，我们接着上面说，大家可以看到，当我们通过请求api获取到数据之后得到的是下面这个Json字符串如下：
为什么我们需要引入api的dto而不是直接使用ViewModel来赋值我们需要的呢，这里有两个好处，第一个，我们可以快速完成json字符串到对象的转变，第二个，我们可以使用我们下面说的一个小技巧快速过滤出我们想组装的ViewModel即可。
注意下我们的这个方法TranslateToClubBaseViewModel ，是我们用于操作dto和ViewModel的主要方法
???????/// <summary> ???????/// 此方法用于将Dto类型 数据 赋值到需要操作的ViewModel上 ???????/// </summary> ???????/// <param name="clubInfoDto">dto数据集</param> ???????/// <returns></returns> ???????public static ClubBase TranslateToClubBaseViewModel(this ClubInfoDto clubInfoDto) ???????{ ???????????ClubBase club = new ClubBase() ???????????{ ???????????????#region 实体按需赋值 ???????????????Id = clubInfoDto.Id, ???????????????Address = clubInfoDto.Address, ???????????????Contactor = clubInfoDto.Contactor, ???????????????Creator = clubInfoDto.Creator, ???????????????Description = clubInfoDto.Description, ???????????????Name = clubInfoDto.Name, ???????????????Phone = clubInfoDto.Phone, ???????????????Year = clubInfoDto.Year ???????????????#endregion ???????????}; ???????????return club; ???????}这样操作的好处，我们就不用维护具体的业务层，专注于ViewModel上面。达到了解耦效果。
未完待续。。。
.NET Core 技巧汇总篇
原文地址：https://www.cnblogs.com/zhangxiaoyong/p/9419202.html