ASPP页面上的ASP.NET MVC错误

Question

I'm getting a only asp.net runtime error "content controls are allowed directly in a content page that contains content controls."

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    <% using (Html.BeginForm("", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
       {%>

    <input type="file" name="FileUpload" />
    <input type="submit" name="Submit" id="Submit" value="Upload" />

<% }
        System.Data.DataTable dt = (System.Data.DataTable) (ViewData["dt"]);
        if (dt != null && dt.Rows.Count > 0)
        {
            foreach (System.Data.DataRow dr in dt.Rows)
            {
                for (int i = 0; i < dt.Columns.Count ; i++)
                {%>

  <span><%= dr[i].ToString()%></span>
        <% }%>
           <br/>
            <%}
        }%>


</asp:Content>

Answer 1

"content controls are allowed directly in a content page that contains content controls."

You are getting this error because you have added server controls to your view:

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

This require ViewState (webforms) such notion do not exist in ASP.net MVC.

Just as an example, your view would look like this:

View

@model YourProject.YourModel

@using (Html.BeginForm("", "Home", FormMethod.Post, new { enctype = "multipart/form-data" }))
{
    <input type="file" name="FileUpload" />
    <input type="submit" name="Submit" id="Submit" value="Upload" />
}

@foreach (var item in YourModel.data)
{
    <span>@item</span>
}

In your Controller you will put the logic.

In your Model you will put properties there for your objects.

Never manipulate data in your View.