MVC notes a form application

Component Form Forms

1.html.beginform ()

This method is used to build the start of a from form, which is constructed by:

Html.BeginForm ("ActionName", "Controllername", Formmethod.method)

Generally constructs a form structure as follows

<% using (Html.BeginForm ("index", "Home", FormMethod.Post)) {%>

。。。。。。

<%}%>

He will produce a similar <form action= "/account/login" method= "POST" ></form> label on the client

2. Now start creating a form instance, first building a form in index.aspx

<% using (Html.BeginForm ("index", "Home", FormMethod.Post)) {%>
Account number: <%=html. TextBox ("username")%>
<br/>
Password: <%=html. Password ("Password")%>
<br/>
<input type= "Submit" value= "Login"/>
<%}%>

3. Write the following code in the corresponding controller HomeController.cs, passing out a viewdata[] dictionary:

Public ActionResult Index ()
{
String struser = request.form["username"];
String strpass = request.form["password"];
viewdata["W"] = "Your account number is:" + struser + "Your password is:" + strpass;
return View ();
}

4. Write acceptance values in index.aspx

<%=viewdata ["W"]%>

ViewData, explain.

1.viewdata[] Dictionary:

1. Simple pass-through value

A. First we create a viewdata[] dictionary in the controller HomeController.cs:

Public ActionResult Index ()
{
viewdata["strvalue"] = "This is a passed value";//This is the viewdata[we pass.

return View ();
}

B. Then we can write in the relative entitlement index.aspx:

<%: viewdata["strvalue"]%>

Controller to view value ViewData detailed

1. Passing a string to the view

In action we save the string in ViewData (or viewbag [ASP. NET 3 or above]) with the following code:

Public ActionResult Index ()
{
viewdata["str1"]= "This is a string";

You can also use ViewBag to pass values

Viewbag.str2= "This is another string";

return View ();
}

In the view we can use the following code to display the string

2. Passing a collection of strings to the view

Public ActionResult Index ()
{
list<string> str1= new list<string> ();
Str1. ADD ("1111");
Str1. ADD ("2222");
Str1. ADD ("3333");
viewdata["str"] = STR1;

return View ();
}

In the view we display the value of the STR1 by using the following statement

@foreach (var A in viewdata["str"] as list<string>)
{
@a
}

3. Passing the value of a DataTable to the view

Public ActionResult Index ()
{

DataTable newtable = new DataTable ("D");
NewTable. Columns.Add ("Product number", typeof (String));
NewTable. Columns.Add ("Customer number", typeof (String));
DataRow NewRow = newtable. NewRow ();
newrow["Product number"] = "132323213434";
newrow["customer number"] = "344223443244";
NewTable. Rows.Add (NewRow);
DataRow Snewrow = newtable. NewRow ();
snewrow["Product number"] = "343432445456";
snewrow["customer number"] = "454523432453";
NewTable. Rows.Add (Snewrow);
viewdata["DT"]= newtable;
return View ();
}

In the view we display the value of DT by the following statement

Note: At the top of the first add: @using System.Data;

<ul>
@foreach (DataRow Dr in (viewdata["DT"] as DataTable). Rows)
{
<li>
@dr ["Product number"], @dr ["Customer number"],
</li>
}
</ul>

MVC notes a form application