3、IResult
相对string,json，Result是就丰富的多，官方提供的如下：
这样就能适配很多场景了，比如认证的登录登出，文件下载，重定向（Redirect,LocalRedirect,RedirectToRoute），以及各种返回值状态，当然也包括返回Text,Json。
除了内置的，还可对结果进行扩展，看一个返回yaml类型的例子。
扩展类（这里引入了一个三方的对象序列化ymal字符串的库YamlDotNet）
static class ResultsExtensions
{
public static IResult Yaml(this IResultExtensions resultExtensions, object YamlObject)
{
ArgumentNullException.ThrowIfNull(resultExtensions, nameof(resultExtensions));
var serialzer = new YamlDotNet.Serialization.SerializerBuilder().Build();
return new YamlResult(serialzer.Serialize(yamlObject));
}
}
class YamlResult : IResult
{
private readonly string _yaml;
public YamlResult(string yaml)
{
_yaml = yaml;
}
public Task ExecuteAsync(HttpContext httpContext)
{
httpContext.Response.ContentType = "yaml";
httpContext.Response.ContentLength = Encoding.UTF8.GetByteCount(_yaml);
return httpContext.Response.WriteAsync(_yaml);
}
}
使用扩展类
app.MapGet("/yaml/questions/{id}", (int id, ExamContext exam) =>
Results.Extensions.Yaml(exam.Questions.Where(s => s.Id == id).Include("Answers").Select(s => new
{
s.Id,
Question = s.Question1,
s.Score,
QuestionType = s.QuestionType.TypeName,
SubjectType = s.SujectType.TypeName,
Answers = s.Answers.Select(t => new { t.Id, Answer = t.Answer1 })
}))
);
结果
content-type
