I previously had a single .aspx.cs file that contained numerous WebMethods. It looked something like this:
// webmethods.aspx.cs
public partial class Default : System.Web.UI.Page {
[System.Web.Services.WebMethod]
public static string Method1() {
}
[System.Web.Services.WebMethod]
public static string Method2() {
}
[System.Web.Services.WebMethod]
public static string Method3() {
}
}
And the corresponding .aspx file, that looked something like this:
<%# Page Language="C#" MasterPageFile="Navigation.master" AutoEventWireup="true" CodeFile="webmethods.aspx.cs" Inherits="Default" Debug="true" %>
I was able to then call my WebMethods successfully using AJAX.
But the webmethods.aspx.cs file was getting very large, and I wanted to split the WebMethods up into different files. So I did that like this:
webmethods.aspx.cs:
// first file
namespace Foo {
public partial class Default : System.Web.UI.Page {
[System.Web.Services.WebMethod]
public static string Method1() {
}
}
webmethods2.aspx.cs:
// second file
namespace Foo {
public partial class Default : System.Web.UI.Page {
[System.Web.Services.WebMethod]
public static string Method2() {
}
}
webmethods3.aspx:
// third file
namespace Foo {
public partial class Default : System.Web.UI.Page {
[System.Web.Services.WebMethod]
public static string Method3() {
}
}
And changed the page directive to Inherits="Foo.Default".
But now, every time I try to access any of the WebMethods in the other files via AJAX, I get an Unknown WebMethod error. The AJAX request is still being sent to the webmethods.aspx.cs file.
Can someone help guide me as to what I did wrong?
WebForm compilation model allows single CodeBehind file for a partial class which compiles into a single .dll. All files in App_code folder also compile in a single file before compilation of .aspx and .aspx.cs. So workaround may look like this.
//Default.aspx
<!DOCTYPE html>
<%# Page Language="C#" AutoEventWireup="true" Inherits="SomeApp.MyPage" %>
<%-- No CodeBehind. inherits external class--%>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label runat="server" ID="lblTest"></asp:Label><br />
<asp:Button runat="server" ID="btnTest" Text="click me" OnClick="btnTest_Click" />
</div>
</form>
</body>
</html>
//App_Code\MyPage.cs
namespace SomeApp
{
public partial class MyPage : System.Web.UI.Page
{
//You need to declare all page controls referred by code here
public System.Web.UI.WebControls.Label lblTest { get; set; }
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
lblTest.Text = "hello world from app_code";
}
}
}
}
//App_code\AnotherFile.cs
namespace SomeApp
{
public partial class MyPage : System.Web.UI.Page
{
protected void btnTest_Click(object sender, EventArgs e)
{
lblTest.Text = "hello world from btnTest_Click";
}
}
}
It should work with [WebMethod]s as well.
Related
I have web app, which has site master 'Adminka.Master'.
Its code:
<%# Master Language="C#" AutoEventWireup="True" CodeBehind="Adminka.master.cs" Inherits="Kaifarik.Pages.Admin.Adminka" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<link rel="stylesheet" href="~/Content/AdminStyles.css" />
</head>
<body>
<form id="form1" runat="server">
<h1>Kaifarik: админ-панель</h1>
<div class="adminContent">
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
<div id="nav">
Управление заказами ### The name 'OrdersUrl' does not exist in current context
Управление каталогом EDOI ## The name 'DishesUrl' does not exist in current context
</div>
</body>
</html>
The problem is that OrdersUrl and DishesUrl methods can't bee seen in Adminka.master.cs file.
Adminka.master.cs code:
namespace Kaifarik.Pages.Admin
{
public partial class Adminka : System.Web.UI.MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
}
public string OrdersUrl
{
get
{
return generateURL("admin_orders");
}
}
public string DishesUrl
{
get
{
return generateURL("admin_dishes");
}
}
private string generateURL(string routeName)
{
return RouteTable.Routes.GetVirtualPath(null, routeName, null).VirtualPath;
}
}
}
I created site master and didnt change inherits from default, yet still I get an error:
Error
Here is structure of my project
I tried to regenerate designer file, change paths.
Any help is appreciated.
You can bind the URL with HyperLink.NavigateUrl from code behind.
Adminka.master.cs
namespace Kaifarik.Pages.Admin
{
public partial class Adminka : System.Web.UI.MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
OrdersHyperlink.NavigateUrl = this.OrdersUrl;
DishesHyperlink.NavigateUrl = this.DishesUrl;
}
public string OrdersUrl
{
get
{
return generateURL("admin_orders");
}
}
public string DishesUrl
{
get
{
return generateURL("admin_dishes");
}
}
private string generateURL(string routeName)
{
return RouteTable.Routes.GetVirtualPath(null, routeName, null).VirtualPath;
}
}
}
Adminka.master
Replace your <a> element with <asp:HyperLink>. <asp:HyperLink> will generate <a> element in the HTML.
And apply Target="_self" to open the page in the current frame.
<asp:HyperLink ID="OrdersHyperlink" runat="server" Text="Управление заказами" Target="_self" />
<asp:HyperLink ID="DishesHyperlink" runat="server" Text="Управление каталогом EDOI" Target="_self" />
References:
HyperLink.NavigateUrl
HyperLink.Target
I am going through a great book learning C# 5.0 and ASP.Net and came across data binding with controls. I have gone through the necessary steps to bind the data but I am receiving a confusing error message as the code below states.
Show.cs //Class for the show properties
namespace BindingExample
{
public class Show
{
public int ID {get; set;}
public String ShowName {get; set;}
}
}
LabelText.aspx.cs //user control code behind
namespace BindingExample
{
public partial class Label LabelText: System.Web.UI.Page
{
protected void load_page(object sender, Event args)
{
Show show = new Show
{
ID = 1,
ShowName = "C# is the Best"
};
//binding
Page.Binding();
}
}
LabelText.aspx //user control markup where the problem occurs.
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="LabelText.aspx.cs" Inherits="BindingExample1.LabelText" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Text="<%# show.ShowName%>"></asp:Label>
</div>
</form>
</body>
</html>
This is where the problem occurs, intellisense is telling me that show.ShowName is not in the current context, I don't know why as first it is exactly what the book presented and also why it would not be since Show.cs class is in the same folder? Any help solving this will be really appreciated. Thanks
Well, as Intellisense indicates, you can't access show. You need to have a field defined as a part of the LabelText class.
(BTW, something is wrong with your class name - is it LabelText or Label? I'll go with LabelText since that's the name you have on the Inherits attribute).
So this is what you need:
namespace BindingExample
{
public partial class LabelText: System.Web.UI.Page
{
protected Show _show;
protected void load_page(object sender, Event args)
{
_show = new Show
{
ID = 1,
ShowName = "C# is the Best"
};
Page.DataBind();
}
}
}
Also, read this answer.
Try making object of Show as public
namespace BindingExample
{
public partial class LabelText: System.Web.UI.Page
{
public Show _show; //this will allow this object to be used in aspx page
protected void load_page(object sender, Event args)
{
_show = new Show
{
ID = 1,
ShowName = "C# is the Best"
};
Page.DataBind();
}
}
}
So... I'm having to get someone's old (2010) .Net 3.5 C# code working... and of course the dev didn't have the project files anymore just the source...
Long story is code is trying to access a property of the master page class and this looks like it should be working according to everything I can find but it's not.
Example of the MasterPage code behind:
public partial class myMasterPage : System.Web.UI.MasterPage
{
private string pageName = "";
public string PageName
{
get { return PageName; }
set { pageName = value; }
}
private int pageID;
public int PageID
{
get { return pageID; }
set { pageID = value; }
}
}
One of the pages code:
<%# Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" Inherits="Help" Codebehind="Help.aspx.cs" %>
<%# MasterType TypeName="ISLMasterPage" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
And finally the code behind for that page:
public partial class Help : BasePage
{
protected void Page_PreInit(object sender, EventArgs e)
{
base.PageID = 1;
Master.PageID = 1;
}
}
I've tried changing the MasterType to virtual path... nothing... error I'm getting is:
E'System.Web.UI.MasterPage' does not contain a definition for 'PageID' and no extension method 'PageID' accepting a first argument of type 'System.Web.UI.MasterPage' could be found (are you missing a using directive or an assembly reference?)
So to me it's obvious that it's not picking up the fact that we want the code behind.
I'm guessing this is something obvious but I've never organized my code in such a way.
Your code doesn't know that your master page is a "myMasterPage"
protected void Page_PreInit(object sender, EventArgs e)
{
base.PageID = 1;
(Master as myMasterPage).PageID = 1;
}
It seems your code has inherited a BasePage
public partial class Help : BasePage
It overrides the normal System.Web.UI.Page and enables easy access to properties on every page where BasePage is used.
In the BasePage class there could be something like this:
public class BasePage : System.Web.UI.Page
{
public Site master;
public BasePage()
{
this.Load += new EventHandler(this.Page_Load);
}
protected void Page_Load(object sender, EventArgs e)
{
master = ((Site)(Page.Master));
}
}
In this example the Master Page is always accessible with master on the pages that inherit BasePage
I am learning ASP.net,
I have a variable in the code behind in c#:
public int hasCar= 1;
and in the aspx file I want to access this variable in javascript function:
function PrintCar( ) {
var ind = <%=this.hasCar%>
alert(ind);
}
but I get error:
does not contain a definition for 'hasCar' and no extension method 'hasCar' accepting a first argument of type 'ASP.vids_aspx' could be
found (are you missing a using directive or an assembly reference?)
what is wrong?
thank you
This works for me:
ASPX Page:
<body>
<script type="text/javascript">
function PrintCar( ) {
var ind = <%=this.HasCar%>
alert(ind);
}
</script>
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="PrintCar();"/>
</form>
</body>
Code Behind
public partial class WebForm1 : System.Web.UI.Page
{
public int HasCar { get; set; }
protected void Page_Load(object sender, EventArgs e)
{
HasCar = 1;
}
}
I want to offer a complimentary answer rather than simply copying what other people have said. Personally I write JS from my C# rather than putting markup in the aspx.
I use this extension method:
public static class ClientScriptManagerExtensions
{
/// <summary>
/// Registers an object as a variable on the page
/// </summary>
public static void RegisterObjectAsVariable(this ClientScriptManager mgr, Type type, string variableName, object objectToEncode)
{
mgr.RegisterClientScriptBlock(type,
string.Concat("ClientScriptManagerExtensions_", variableName),
string.Concat("var ", variableName, " = ", new JavaScriptSerializer().Serialize(objectToEncode), ";"),
true);
}
}
Then to call I do:
this.Page.ClientScript.RegisterObjectAsVariable(typeof(MyPage), "myVariable", new { myProperty = 123});
This creates a js object on your page:
var myVariable =
{
myProperty = 123
};
Which you can access via JS. I find this approach much cleaner and it lets you pass all sorts of complex objects to your code.
Have you the following line at start line of your .aspx page ?
<%# Page Language="C#" CodeBehind="default.aspx.cs" Inherits="YOURNAMESPACE._default" %>
I have created test project just for your problem.
Try this code
Aspx Code..
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="test.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<script type="text/javascript">
function PrintCar() {
var ind = <%=this.HasCar%>;
alert(ind);
}
</script>
<form id="form1" runat="server">
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="PrintCar()"/>
</form>
</body>
</html>
Code behind...
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace test
{
public partial class WebForm1 : System.Web.UI.Page
{
public int HasCar { get; set; }
protected void Page_Load(object sender, EventArgs e)
{
HasCar = 1;
}
}
}
Aloha,
I have a custom control that I need to instantiate from within a class and add to a page. My class has a function that I pass the Page to so i have access to the controls on the page. I'm using this method to add standard ASP controls already and everything it working as expected. My problem is that the type for the custom control is know defined?
I read here to move the .cs from the control into the App_Code folder but when I do that it won't compile as it doesn't see the controls in the ascx as valid. For example I get CS0103: The name 'litTest' does not exist in the current context. So as they are partial classes I created a new empty partial class in the App_Code folder and left the control's .cs file alone.
Well it compiles this way but when I add the control to the Page.controls collection, I dont see anything on the page where it should be. For example I added TEST to the bottom of the ascx file, it I dont see it on the page. Additionally the control has variables that I need to set that I don't have access to when using the empty partial class.
I know that what I am trying to do works with standard controls, why can't I seem to make this work with a custom control?
My partial class in the App_Code folder:
public partial class CustomControlClass : System.Web.UI.UserControl
{
}
My partial class in for the user control:
public partial class CustomControlClass : System.Web.UI.UserControl
{
private int _myValue= -1;
public int myValue
{
get { return _myValue; }
set { _myValue= value; }
}
protected void Page_Init(object sender, EventArgs e)
{
litTest.Text = "TEST";
}
}
My user control ascx:
<%# Control Language="C#" AutoEventWireup="true" CodeFile="CustomControlClass.ascx.cs" Inherits="CustomControlClass" %>
<asp:Literal ID="litTest" runat="server"></asp:Literal>
TEST
My App_Code class:
public class MyClass
{
public static void doWork(Page Ctrl)
{
CustomControlClass c = new CustomControlClass();
//c.myValue = 1; // Wont compile with this line
Ctrl.Controls.Add(c);
Literal l = new Literal();
l.Text = "HELLO";
Ctrl.Controls.Add(l);
}
}
The page output does not have the word TEST on it at all. The word HELLO shows up just fine. I've tried calling the MyClass.doWork() from the pages Load, Init and PreInit callbacks, all result in the dame thing.
Update:
As Minh Nguyen suggested I can use Ctrl.LoadControl("~/Controls/CustomControlClass.ascx"); to load the control but I can not cast it as its own type I have to assign it as a Control type:
Control c= Ctrl.LoadControl("~/Controls/CustomControlClass.ascx");
Doing this will let me add the control to the page and have it work as expected. The down side is that I have no access to any of the controls properties. To solve this i am doing this:
c.GetType().GetProperty("myValue").SetValue(c, 1, null);
This works, but I'm not sure how expensive that it to use. I wish I could just cast the control but I get an error when I try.
I'm leaving this unanswered for a bit to see if there are any other options.
Use
CustomControlClass c = (CustomControlClass)Ctrl.LoadControl("~/VirtualPathToASCX/CustomControlClass.ascx");
instead of
CustomControlClass c = new CustomControlClass();
UPDATE: fix cast bug
//LoadControl
ASP.customcontrolclass_ascx c = (ASP.customcontrolclass_ascx)this.LoadControl("~/Controls/CustomControlClass.ascx");
//set myValue
c.myValue = 3;
you can't see ASP.customcontrolclass_ascx type in VS AutoComplete List but it compiled with no error.
not sure what's going on with your code, but using mostly what you showed works for me:
~/controls/testControl.ascx:
<%# Control Language='C#' AutoEventWireup='false'
Inherits='CustomControlClass'
%>
<asp:Literal ID='litTest' runat='server'></asp:Literal>
.aspx page:
<%# Page Language='C#' %>
<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>
<script runat='server'>
protected override void OnInit(EventArgs e) {
base.OnInit(e);
MyClass.doWork(this.Page);
}
</script>
<html xmlns='http://www.w3.org/1999/xhtml'>
<head runat='server'><title></title></head>
<body><form id='form1' runat='server'>
</form></body></html>
~/app_code/CustomControlClass.cs:
using System;
using System.Web;
using System.Web.UI.WebControls;
public partial class CustomControlClass : System.Web.UI.UserControl {
private int _myValue= -1;
public int myValue {
get { return _myValue; }
set { _myValue= value; }
}
private Literal _litTest;
public Literal litTest {
get { return _litTest; }
set { _litTest= value; }
}
protected override void OnInit(EventArgs e) {
base.OnInit(e);
litTest.Text = "TEST";
}
}
~/app_code/MyClass:
using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public class MyClass {
public static void doWork(Page Ctrl) {
CustomControlClass c =
(CustomControlClass) Ctrl.LoadControl("~/controls/testControl.ascx");
c.myValue = 1;
Ctrl.Form.Controls.Add(c);
Literal l = new Literal();
l.Text = string.Format(
"<p>CustomControlClass.myValue: {0} </p>",
c.myValue
)
+ string.Format(
"<p>CustomControlClass.litTest.Text: {0} </p>",
c.litTest.Text
)
;
Ctrl.Form.Controls.Add(l);
}
}
in other words the cast to CustomControlClass when calling LoadControl() works for me. if i understood you correctly that's the problem?
A different way of LoadControl which works (only .NET 4 tested)
Usage is as follows in any page you can call
protected void Page_Load(object sender, EventArgs e)
{
Control ctrl = SomeClass.GetNewUserControl( "hello add me");
Panel1.Controls.Add(ctrl);
}
~/app_code/BaseMyControls.cs:
using System;
using System.Collections.Generic;
using System.Web;
/// <summary>
/// Summary description for BaseMyControls
/// </summary>
public class BaseMyControls : System.Web.UI.UserControl
{
public string strProperty;
public BaseMyControls()
{
}
}
~/app_code/SomeClassInApp_Code.cs:
using System;
using System.Collections.Generic;
using System.Web;
/// <summary>
/// Summary description for SomeClassInApp_Code
/// </summary>
public class SomeClassInApp_Code
{
public static System.Web.UI.Control GetNewUserControl(string someString)
{
BaseMyControls bc = (BaseMyControls)(new System.Web.UI.UserControl()).LoadControl("~/controls/MyUC.ascx");
bc.strProperty = someString;
return bc;
}
}
~/controls/MyUC.aspx:
<%# Control Language="C#" AutoEventWireup="true" CodeFile="MyUC.ascx.cs" Inherits="MyUC" %>
<asp:Label runat="server" ID="lbl" /></asp:Label>
~/controls/MyUC.aspx.cs:
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class MyUC : BaseMyControls
{
protected void Page_Load(object sender, EventArgs e)
{
string a = this.strProperty;
lbl.Text = a;
}
}