asp.net core mvc中自定义ActionResult

在GitHub上有个项目，本来是作为自己研究学习.net core的Demo，没想到很多同学在看，还给了很多星，所以觉得应该升成3.0，整理一下，写成博分享给学习.net core的同学们。

项目名称：Asp.NetCoreExperiment

项目地址：https://github.com/axzxs2001/Asp.NetCoreExperiment

asp.net core mvc的模板中返回前端时可以用IActionResult的子类，来区分不同的返回内容，那怎么来实现自定义的ActionResult呢？

github代码如下：

https://github.com/axzxs2001/Asp.NetCoreExperiment/tree/master/Asp.NetCoreExperiment/Common/YamlResultDemo

首先引用一个三方包

PM> Install-Package YamlDotNet

YamlResult.cs

    /// <summary>
    /// YamlResul
    /// </summary>
    public class YamlResult : ActionResult
    {
        /// <summary>
        /// Yaml值
        /// </summary>
        public object Value { get; private set; }
        /// <summary>
        /// 构造
        /// </summary>
        /// <param name="value"></param>
        public YamlResult(object value)
        {
            Value = value;
        }
        /// <summary>
        /// Result执行者
        /// </summary>
        /// <param name="context">上下文</param>
        /// <returns></returns>
        public override async Task ExecuteResultAsync(ActionContext context)
        {
            var services = context.HttpContext.RequestServices;
            var executor = services.GetRequiredService<IActionResultExecutor<YamlResult>>();
            await executor.ExecuteAsync(context, new YamlResult(this));
        }
    }

YamlResultExecutor.cs

    /// <summary>
    /// YamlResult执行者
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class YamlResultExecutor<T> : IActionResultExecutor<T> where T : YamlResult
    {
        /// <summary>
        /// 执行
        /// </summary>
        /// <param name="context">上下文</param>
        /// <param name="result">值</param>
        /// <returns></returns>
        public async Task ExecuteAsync(ActionContext context, T result)
        {
            var serialize = new YamlDotNet.Serialization.Serializer();
            var valueString = serialize.Serialize(result.Value);
            // 把对象转成yaml字符串，用Response返回
            context.HttpContext.Response.ContentType = "Content-Type: text/html; charset=utf-8";
            await context.HttpContext.Response.WriteAsync(valueString);
        }
    }

TestController.cs中调用代码

        [HttpGet]
        public IActionResult Get()
        {
            return new YamlResult(new
            {
                Data = new { a = 1, B = "bbb", C = DateTime.Now, d = new string[] { "a", "b", "c" } },
                Status = true,
                Message = "成功"
            });
        }

运行结果：