// home/index.cshtml
@{
    //C# code
    Layout = null;
    int m = 10;
    string s = "<h1>hello</h1>";

    <div>HTML Tag</div>


    @:text...
    <text>
        aaa
        bbb
        cc
    </text>
}
@{
    string[] items = { "item1", "item2", "item3" };


    foreach (var item in items)
    {
        <div>@item</div>
    }
}

@foreach (var item in items)
{
    <div>@item</div>
}

@@
    [e-mail]

    m
    @m
    @m+50
    @(m+50)
    @s
    @Html.Raw(s)
//================================
//operacontroller.cs
public async Task<ActionResult> FilterData(int number)
{
    //LINQ
    var query=(from opera in context.Operas
              orderby opera.Year descending
              select opera).Take(number);
    return View(nameof(Index),await query.ToListAsync());
}
// opera/index.cshtml
@using (Html.BeginForm("filterdata","opera",FormMethod.Get))
{
    @:Number: <input type="text" name="number" />
    <input type="submit" />
}
//operacontext.cs
public class OperaContext:DbContext
{   
    public OperaContext()
    {
        Database.Log =s=> Debug.WriteLine(s);
    }

    public DbSet<Opera> Operas { get; set; }
}
//=================================
// comment.cs
public class Comment
{
    public int Id { get; set; }      
    public string Subject { get; set; }

    [DataType(DataType.MultilineText)]
    public string HtmlComment { get; set; }
    public int? Price { get; set; }
    public bool IsApprove { get; set; }

}
// commentcontroller.cs
public class CommentController : Controller
{
    // GET: Comment
    public ActionResult Index()
    {
        return View();
    }
    public ActionResult Create()
    {
        return View();
    }
    [HttpPost]
    public ActionResult Create(Comment comment)
    {
        return Json(comment);
    }
}

// home/index.cshtml
<h1>Home</h1>

@Html.ActionLink("Opera List","Index","Opera") |
@Html.ActionLink("Comment Create","Create","Comment")
//===============================
// commentcontroller.cs
 public ActionResult GetComments()
 {
     List<Comment> data = new List<Comment> {
      new Comment{Id=100,Subject="A"},
      new Comment{Id=200,Subject="B"},
      new Comment{Id=300,Subject="C"}
    };
     return View(data);
 }
public ActionResult GetOtherComments()
{
    List<Comment> data = new List<Comment> {
     new Comment{Id=400,Subject="D"},
     new Comment{Id=500,Subject="E"},
     new Comment{Id=600,Subject="F"}
   };
    return View(data);
}

// comment/getcommemnts.cshtml
<h1>GetComments</h1>

<ul>
    @foreach (var item in Model)
    {
        <li>@item.Subject</li>
    }
</ul>

// comment/getothercommemnts.cshtml
<h1>GetOtherComments</h1>

<ul>
    @foreach (var item in Model)
    {
        <li>@item.Subject</li>
    }
</ul>



// home/index.cshtml
@Html.ActionLink("Opera List", "Index", "Opera") |
@Html.ActionLink("Comment Create", "Create", "Comment") |
@Html.ActionLink("GetComments", "GetComments", "Comment") |

//===============================
// shared/_commentlist.cshtml
@model IEnumerable<Mod02.Models.Comment>
<ul style="background-color:yellow;">
    @foreach (var item in Model)
    {
        <li>@item.Subject</li>
    }
</ul>

// comment/getcommemnts.cshtml
<h1>GetComments</h1>

@Html.Partial("_CommentList")
    
 // comment/getothercommemnts.cshtml   
<h1>GetOtherComments</h1>

@Html.Partial("_CommentList")
//==========================
// commentcontroller.cs
public ActionResult GetAllComments()
{
    List<Comment> data = new List<Comment> {
     new Comment{Id=100,Subject="A"},
     new Comment{Id=200,Subject="B"},
     new Comment{Id=300,Subject="C"},
     new Comment{Id=400,Subject="D"},
     new Comment{Id=500,Subject="E"},
     new Comment{Id=600,Subject="F"}
   };
    return View("_CommentList", data);
}

// home/index.cshtml
@Html.Action("GetAllComments","Comment")
//=========================
// commentcontroller.cs
public ActionResult GetAllComments(string color)
{
    ViewBag.color = color;

    List<Comment> data = new List<Comment> {
     new Comment{Id=100,Subject="A"},
     new Comment{Id=200,Subject="B"},
     new Comment{Id=300,Subject="C"},
     new Comment{Id=400,Subject="D"},
     new Comment{Id=500,Subject="E"},
     new Comment{Id=600,Subject="F"}
   };
    return View("_CommentList", data);
}

// home/index.cshtml
@Html.Action("GetAllComments","Comment", new {color="pink"})