public class TestController : Controller
    {

    }

    [Controller]
    public class Test : Controller
    {

    }

        public IActionResult Hello()
        {
            // Query
            var name = Request.Query["name"];
            // QueryString
            var query = Request.QueryString.Value;
            // Form
            var username = Request.Form["username"];
            // Cookies
            var cookie = Request.Cookies["item"];
            // Headers
            var headers = Request.Headers["salt"];

            return Content("Hello");
        }

        public IActionResult Hello()
        {       
            // byte[]
            HttpContext.Session.Set("byte", new byte[] { 1, 2, 3, 4, 5 });
            var bytes = HttpContext.Session.Get("byte");
            // string
            HttpContext.Session.SetString("name", "tom");
            var name = HttpContext.Session.GetString("name");
            // int
            HttpContext.Session.SetInt32("id", 20);
            var id = HttpContext.Session.GetInt32("id");
            HttpContext.Session.Remove("name");
            HttpContext.Session.Clear();
            
            return Content("Hello");
        }

        public IActionResult Hello(RequestModel request,int? age)
        {
            // 查詢字符串
            var test = Request.Query["test"];
            // 簡單類型
            var userAge = age;
            // 自定義類型
            var name = request.Name;

            return Content("Hello");
        }

        public class RequestModel
        {
            public string Name { get; set; }       
        }

    /// <summary>
    /// 拍賣師控制類
    /// </summary>
    [NonController]
    public class AuctionController
    {

    }

        public IActionResult Say(
            [FromForm]string name,
            [FromQuery]int age,
            [FromHeader] string salt,
            [FromBody] string content
            )
        {
            return View();
        }

    [Controller]
    public class Test : Controller
    {
        private readonly IMemoryCache _cache;

        public Test(IMemoryCache memoryCache)
        {
            this._cache = memoryCache;   
        }

        public IActionResult ReadCache()
        {
            _cache.Set("name","tom");
            _cache.Get("name");

            _cache.Set("age",30);
            _cache.Get("age");

            User tom = new User(){ Name = "admin",Pwd = "123456"};
            _cache.Set<User>("user",tom);
            _cache.Get<User>("user");
            return Content("ok");
        }
    }

    public class User
    {
        public string Name { get; set; }
        public string Pwd { get; set; }
    }

  public abstract class ValidationAttribute : Attribute
  {
    /// <summary>Initializes a new instance of the <see cref="T:System.ComponentModel.DataAnnotations.ValidationAttribute"></see> class.</summary>
    protected ValidationAttribute();

    /// <summary>Initializes a new instance of the <see cref="T:System.ComponentModel.DataAnnotations.ValidationAttribute"></see> class by using the function that enables access to validation resources.</summary>
    /// <param name="errorMessageAccessor">The function that enables access to validation resources.</param>
    /// <exception cref="T:System.ArgumentNullException"><paramref name="errorMessageAccessor">errorMessageAccessor</paramref> is null.</exception>
    protected ValidationAttribute(Func<string> errorMessageAccessor);

    /// <summary>Initializes a new instance of the <see cref="T:System.ComponentModel.DataAnnotations.ValidationAttribute"></see> class by using the error message to associate with a validation control.</summary>
    /// <param name="errorMessage">The error message to associate with a validation control.</param>
    protected ValidationAttribute(string errorMessage);

    /// <summary>Gets or sets an error message to associate with a validation control if validation fails.</summary>
    /// <returns>The error message that is associated with the validation control.</returns>
    public string ErrorMessage { get; set; }

    /// <summary>Gets or sets the error message resource name to use in order to look up the <see cref="P:System.ComponentModel.DataAnnotations.ValidationAttribute.ErrorMessageResourceType"></see> property value if validation fails.</summary>
    /// <returns>The error message resource that is associated with a validation control.</returns>
    public string ErrorMessageResourceName { get; set; }

    /// <summary>Gets or sets the resource type to use for error-message lookup if validation fails.</summary>
    /// <returns>The type of error message that is associated with a validation control.</returns>
    public Type ErrorMessageResourceType { get; set; }

    /// <summary>Gets the localized validation error message.</summary>
    /// <returns>The localized validation error message.</returns>
    protected string ErrorMessageString { get; }

    /// <summary>Gets a value that indicates whether the attribute requires validation context.</summary>
    /// <returns>true if the attribute requires validation context; otherwise, false.</returns>
    public virtual bool RequiresValidationContext { get; }

    /// <summary>Applies formatting to an error message, based on the data field where the error occurred.</summary>
    /// <param name="name">The name to include in the formatted message.</param>
    /// <returns>An instance of the formatted error message.</returns>
    public virtual string FormatErrorMessage(string name);

    /// <summary>Checks whether the specified value is valid with respect to the current validation attribute.</summary>
    /// <param name="value">The value to validate.</param>
    /// <param name="validationContext">The context information about the validation operation.</param>
    /// <returns>An instance of the <see cref="System.ComponentModel.DataAnnotations.ValidationResult"></see> class.</returns>
    public ValidationResult GetValidationResult(
      object value,
      ValidationContext validationContext);

    /// <summary>Determines whether the specified value of the object is valid.</summary>
    /// <param name="value">The value of the object to validate.</param>
    /// <returns>true if the specified value is valid; otherwise, false.</returns>
    public virtual bool IsValid(object value);

    /// <summary>Validates the specified value with respect to the current validation attribute.</summary>
    /// <param name="value">The value to validate.</param>
    /// <param name="validationContext">The context information about the validation operation.</param>
    /// <returns>An instance of the <see cref="System.ComponentModel.DataAnnotations.ValidationResult"></see> class.</returns>
    protected virtual ValidationResult IsValid(
      object value,
      ValidationContext validationContext);

    /// <summary>Validates the specified object.</summary>
    /// <param name="value">The object to validate.</param>
    /// <param name="validationContext">The <see cref="T:System.ComponentModel.DataAnnotations.ValidationContext"></see> object that describes the context where the validation checks are performed. This parameter cannot be null.</param>
    /// <exception cref="T:System.ComponentModel.DataAnnotations.ValidationException">Validation failed.</exception>
    public void Validate(object value, ValidationContext validationContext);

    /// <summary>Validates the specified object.</summary>
    /// <param name="value">The value of the object to validate.</param>
    /// <param name="name">The name to include in the error message.</param>
    /// <exception cref="T:System.ComponentModel.DataAnnotations.ValidationException"><paramref name="value">value</paramref> is not valid.</exception>
    public void Validate(object value, string name);
  }

    public class UserLogin
    {
        [Required(ErrorMessage = "用戶名不能為空")]
        [StringLength(10,ErrorMessage = "用戶名長度不能超過10位")]
        public string UserName { get; set; }
          
        //[Required(ErrorMessage = "密碼不能為空")]
        [StringLength(6,ErrorMessage = "密碼長度不能超過6位")]
        public string Password { get; set; }
    }

    public class FormController : Controller
    {
        public IActionResult Index()
        {
            return View(new UserLogin());
        }

        public IActionResult PostData(UserLogin login)
        {
            return Content(ModelState.IsValid?"數據有效":"數據無效");
        }
    }

@model Lesson2.Models.UserLogin
@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
    <script src="~/lib/jquery/dist/jquery.min.js"></script>
    <script src="~/lib/jquery-validation/dist/jquery.validate.min.js"></script>
    <script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.min.js"></script>
</head>
<body>
    <form asp-action="PostData" method="post">
        <table>
            <tr>
                <td>用戶名</td>
                <td>@Html.TextBoxFor(m => m.UserName)</td>
                <td>@Html.ValidationMessageFor(m => m.UserName)</td>
            </tr>
            <tr>
                <td>密碼</td>
                <td>@Html.PasswordFor(m => m.Password)</td>
                <td>@Html.ValidationMessageFor(m => m.Password)</td>
            </tr>
            <tr>
                <td></td>
                <td><input type="submit" value="登錄" /></td>
                <td></td>
            </tr>
        </table>
    </form>
</body>
</html>

    app.UseMvc(routes =>
    {
        routes.MapRoute(
            name: "default",
            template: "{controller=Home}/{action=Index}/{id?}");

        routes.MapRoute(
            name: "admin_default",
            template: "admin/{controller=Home}/{action=Index}/{id?}");
    });

    [Route("admin/form")]
    public class FormController : Controller
    {
        [Route("index")]
        public IActionResult Index()
        {
            return View(new UserLogin());
        }

        public IActionResult PostData(UserLogin login)
        {
            return Content(ModelState.IsValid?"數據有效":"數據無效");
        }
    }

    public IActionResult Index([FromRoute] int? id)
    {
        return View();
    }

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
    <!-- 關閉視圖預編譯 -->
    <MvcRazorCompileOnPublish>false</MvcRazorCompileOnPublish>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.App" />
    <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.1.2" PrivateAssets="All" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.1.1" />
  </ItemGroup>

</Project>

<!-- 依賴框架的部署 (FDD) -->
<PropertyGroup>
  <TargetFramework>netcoreapp2.2</TargetFramework>
  <RuntimeIdentifier>win7-x64</RuntimeIdentifier>
  <SelfContained>false</SelfContained>
  <IsTransformWebConfigDisabled>true</IsTransformWebConfigDisabled>
</PropertyGroup>
<!-- 獨立部署 (SCD) -->
<PropertyGroup>
  <TargetFramework>netcoreapp2.2</TargetFramework>
  <RuntimeIdentifier>win7-x64</RuntimeIdentifier>
  <IsTransformWebConfigDisabled>true</IsTransformWebConfigDisabled>
</PropertyGroup>
    ...
    ...
    ...