C# 泛型说明

详细说明转  

https://www.cnblogs.com/dotnet261010/p/9034594.html

最近项目用到了多个参数的泛型方法，这里说明下泛型的组成：

/// <summary>
        /// 泛型处理方法。
        /// </summary>
        /// <typeparam name="TRequestBody"></typeparam>
        /// <typeparam name="TTestParam"></typeparam>
        /// <typeparam name="TResponse"></typeparam>
        /// <param name="request"></param>
        /// <param name="tstr"></param>
        /// <param name="codeBlock"></param>
        /// <returns></returns>
        public static async Task<Response<TResponse>> Process<TRequestBody,TTestParam, TResponse>(this Request<TRequestBody> request, TTestParam tstr, Func<FlexBenefitAppContext, Task<Response<TResponse>>> codeBlock) where TRequestBody : class
        {
            var appContext = new FlexBenefitAppContext();// BuildAppContext();
            appContext.Culture = request.Header.Culture;
            appContext.ClientCode = "benefit-client-template";//get client code from request
            appContext.EmployeeId = 1;//use openId to get employee info
            return await codeBlock(appContext);
        }

本方法中包含了3个类型参数，分别是Process<TRequestBody,TTestParam, TResponse>，在Process方法中，分别传入了这三个类型参数的参数this Request<TRequestBody> request,这里采用的是this扩展方法,所以第一个参数就是request本身, TTestParam tstr, Func<FlexBenefitAppContext, Task<Response<TResponse>>> codeBlock

调用方法：

 public async Task<Response<EmployeeInfo>> Info([FromBody]Request<EmployeeNoParameter> request)
        {
            var response = new Response<EmployeeInfo>()
            {
                Header = new ResponseHeader()
                {
                    Version = 1,
                    IsSuccess = true,
                    Errors = new List<ResponseError>()
                }
            };
　　　　　　　//这里的process方法调用上面定义的泛型方法
            return await request.Process("aaaa",async (appContext) =>
            {
                using (var serviceContext = new ServiceContext(appContext))
                {
                    var employeeInfo = await serviceContext.EmployeeService.GetEmployeeInfo(request.Body.EmployeeNo);
                    response.Body = employeeInfo;
                }

                return response;
            });
        }