I've got a weird issue in Visual Studio where I can't reference controls from the code-behind page.
To give a really simple example, my page is like this:
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="New.aspx.cs" Inherits="ITDashboard.idea.New" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
</head>
<body>
<form id="form1" runat="server">
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
</form>
</body>
</html>
And my codebehind is this:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace ITDashboard.idea
{
public partial class New : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Label1.Text = "hello";
}
}
}
The application is called ITDashboard, and this page is in a folder called "idea".
Have looked around, and some posts suggest deleting the designer file and recreating it. However, there's no option in VS2012 that I could see. Also I get the same error with a new blank page, even at the site root.
I don't have enough points yet to add a comment, so please forgive this comment in the answer box!
I've seen this before. "This" = VS not adding controls to the designer file. From what I was able to find, it's just a corruption in the page. Or if it's happening on all pages, it's a corruption of the project. You didn't do anything to cause it, so there is nothing you can do in the future to avoid it. Luckily, in 13+ years of working with various versions of VS, I've only seen it two or three times.
Andrew nailed it. If the problem is isolated to this page, then create a new page and replicate your corrupt page one control at a time. If it's at the project level (and it sounds like it is), you'll have a little more work to do.
Here's a good tip on how to recover from a corrupt project:
How can I recover a corrupt .csproj file in Visual Studio 2010?
Good luck!
Thought I'd post in case somebody has the same thing.
All the web posts I saw were pointing to "Convert to web application" (now under Project in VS2013). However this wasn't working for me.
Finally got it working by changing the .net Framework type (arbitrarily to 4.5). I then re-ran the Convert to web application option and it recreated the designer.cs files.
Also, any new controls I add are automatically added to the designer.cs properly now.
if you are having redouble setting the text of Label1 ...change Label1.text to Label1.Text.
Severity Code Description Project File Line Suppression State
Error CS0103 The name 'label1' does not exist in the current context ConsoleApplication6
Related
I'm doing a side project where I've just loaded the existing code. These things always require some jiggering of references and nuGet packages, and I've resolved most of these issues, but there's one that's bedeviling me that I haven't sorted out.
It's a standard webforms project, and I'm getting the error: "'new_client_aspx' does not contain a definition for 'imgEdit_Click' and no extension method 'imgEdit_Click' accepting a first argument of type 'new_client_aspx' could be found (are you missing a using directive or an assembly reference?)"
The declaration in mark-up is:
<asp:ImageButton ID="imgEdit" ImageUrl="~/images/file_edit.png"
CommandName="Edit" runat="server" Width="30px" OnClick="imgEdit_Click" />
The code-behind handler is currently naked, but is:
protected void imgEdit_Click(object sender, ImageClickEventArgs e)
{
//Code here for editing.
}
I've opened the project in VS2013 Premier and VS2017 Community edition, and both throw the same error. Any ideas for fixing this? Thanks in advance.
edit: I just noticed this account has my old work email. Apparently changing the email is a somewhat labyrinthine process. Anyway, don't email me there, if you were otherwise inclined
The issue You described can be caused by several different things missing in the code:
It appears when there is no method defined in the page's code-behind file or the method is defined as private (explicitly or by not using any accessor). However, according to the description, You already have the method, so it's rather not the case.
The same error can also appear when code-behind class is not correctly bound to the markup (*.aspx) file. Your markup file should begin with a line looking similar to this one:
<%# Page Title="My page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="NewClient.aspx.cs" Inherits="WebApplication.NewClient" %>
Take a look at Inherits attribute. Make sure it correctly points to Your code-behind class (in my example, NewClient is a class name and WebApplication is a namespace where it's located).
The ....aspx.designer.cs file may be corrupted. Try to comment out the handler, remove it from the markup and then let Visual Studio to create new handler by itself, as described in this answer: 'ASP.business_aspx' does not contain a definition for 'submitSearchClick' and no extension method 'submitSearchClick'
Please let me know if this solves Your issue.
This is specifically for Visual Studio 2015.
In my Site.master I have
<%# Master Language="C#" AutoEventWireup="true" CodeFile="~/Site.master.cs" Inherits="SiteMaster" %>
<asp:Literal ID="Literal1" runat="server" />
And in my Site.master.cs I have
Literal1.Text = "test";
In addition in Site.master.cs I have
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using WebMatrix.Data;
public partial class SiteMaster : MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
Literal1.Text = "test";
}
And it won't build. I get the error:
error CS0103: The name 'Literal1' does not exist in the current context.
There is no designer file. I don't know how to get the designer file back for VS2015. I've tried several older suggestions from previous versions of VS.
I'd like to get it to build whether I need a designer file or not.
Try to clean and rebuild your project obviously when the project is not running. Sometimes when your project is running visual studio cannot generate designer files properly. Try change the label Id or remove and re-insert it.
To solve this error I created a new master page. I deleted everything below the header and pasted everything below the header from the original (not including the original's header.)
Also, in the code behind I did not delete the class, but instead pasted the original functions into the new class.
Then on the pages that use the old master page I changed them to use the new master page.
why m i getting this error "The name 'lblHelloWorld' does not exist in the current context"? How do i fix it?
<%# Page Language="C#" AutoEventWireup="True" Inherits="_Default" Codebehind="Default.aspx.cs" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Hello, world!</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="MainScriptManager" runat="server" />
<asp:UpdatePanel ID="pnlHelloWorld" runat="server">
<ContentTemplate>
<asp:Label runat="server" ID="lblHelloWorld" Text="Click the button!" />
<br /><br />
<asp:Button runat="server" ID="btnHelloWorld" OnClick="btnHelloWorld_Click" Text="Update label!" />
</ContentTemplate>
</asp:UpdatePanel>
</form>
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace ajaxTesting
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnHelloWorld_Click(object sender, EventArgs e)
{
lblHelloWorld.Text = "Hello, world - this is a fresh message from ASP.NET AJAX! The time right now is: " + DateTime.Now.ToLongTimeString();
}
}
}
I tried cleaning and rebuliding; deleting the designer.cs file and recreating it but was of no use.
I think the problem in your designer.cs file.Try to add a reference manually for this label in the designer.cs file.
EDIT:
The problem after revision to your code is in the name space.
To fix your problem::
Replace your line by this:
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="ajaxTesting._Default" %>
The Best possible solution would be:
Copy all the lines of code between <body> and </body>
Create a new aspx page in your project.
Replace the <body> tag with the one you copied
Similarly copy and paste the code from .cs file also.
I feel this should solve your problem.
Step 1:
Copy off the aspx form, codebehind and designer files and re-create the form again by copying and pasting.
Step 2:
If step 1 doesn't fix it: In visual Studio, go to Edit -> Find and Replace -> Find in Files and search within your project for a control with the same name.
Step 3
Close out Visual Studio and all browsers. Temporarily stop IIS and navigate to the temp ASP.NET files folder (the path may be different on your machine):
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files
Start deleting everything from the site folder in here, starting at the bottom (because you may get ACL folder permission restrictions).
Re-start IIS and try again (after you have tried one or both of previous steps).
Another possibility that I had:
If you duplicate the .cs file, for example: duplicate "Default.aspx.cs", getting "Default.aspx - Copy.cs" (now you have the two files on the same folder),
the result will be: the file will appear in the project file list. Even excluding the copied file out of the project, but leave the file on the same folder will not solve the problem.
In order to avoid this issue, remove the copied file out of the project folders.
I had this problem after importing source files from someone else. After a while I discovered I didn't have any designer.cs file.
I followed this solution. Especially the part about "Convert to Web Application". That did the trick for me!
I faced this same problem in asp.net website (3.5) In my case there were 2 copies of the same file.
Compute.aspx
Compute_backup.aspx
I excluded the #2 file from the website and it worked for me.
I completely removed the apex file a re-created it and left to object name _Default. I then set about adjusting the C# code accordingly and voila, it worked OK. This was when working with ASP.NET 3.5 in VS2008. In this case I got it to work, but there is still something funky about VS2008 or this would not be necessary.
I am beginning to wonder if this is even possible. It just seems so simple.
I have a published web project. I want to add some .ascx files (with .cs & designer.cs files) to that published web site. These are simple custom user controls that access methods already part of the original application.
Question? Is it possible to just drop these in the published web project without building the entire solution? If not why?
When I drop these files in and run my application I get the error:
"Parse Error: Could not load type 'the name of my custom controls namespace'".
There is not a lot of code to show so this is all I have.
Default.aspx
<%# Page Language="C#" MasterPageFile="~/MasterPages/TwoColumn.master" AutoEventWireup="true"
Inherits="ApplicationName.Web.Default" CodeBehind="Default.aspx.cs" %>
<%# Register TagPrefix="uc1" TagName="CustomControl" Src="~/Controls/Custom/CustomControl.ascx" %>
<asp:Content ID="content" contentplaceholder="cph" runat="Server">
<uc1:CustomControl ID="cc1" runat="server" CustomProperty="Hello World" />
</asp:Content>
CustomControl.ascx
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="CustomControl.ascx.cs"
Inherits="ApplicationName.Web.Controls.Custom.CustomControl" %>
<asp:PlaceHolder ID="ph1" runat="server></asp:PlaceHolder>
CustomControl.ascx.cs
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace ApplicationName.Web.Controls.Custom
{
public partial class CustomControl : System.Web.UI.UserControl
{
///My logic
}
}
Again it seems so easy. What am I missing? Or is this not possible? Thanks.
UPDATE:
I figured this out. The above scenario is possible. The problem is not with the name-space as the error message suggests. Rather it is the code-behind declaration. Code-behind files for any type of file are compiled when the application is published. I am still confused as to why it appears to be editable when you browse through a web directory, I would think it would be stored in a .dll file or something. Maybe someone can shed some light on this.
Anyways, replacing code-behind with code-file rectifies the problem as code-files are not compiled and are therefore readable at application run-time.
Some links that were helpful can be found here and here.
It is possible but you still have to compile your user control and drop that dll into the proper bin directory for your app. That's usually the cause of the type loading error you described.
This approach could be sloppy, you are basically either
1) Creating the User Control in the wrong project
2) Trying to add the same User Control to two projects
Have you thought about a cleaner approach and just creating a class that inherits from System.Web.Ui.Control and then adding this in a .common project? Then pulling this into the corrct project? The problem with your approach is on precompilation and deployment you could end up trying to put two user controls into the same folder which will break the build....
The alternate approach (and the microsoft way) would be like this...
The code - write a custom control
namespace MyProject.Common.Controls
{
public class PolicyTab : System.Web.UI.Control
{
protected override void CreateChildControls()
{
base.CreateChildControls();
HtmlGenericControl policyTab = new HtmlGenericControl();
policyTab.InnerHtml = "<strong> Some policy code here! </strong>";
this.Controls.Add(policyTab);
}
}
}
The page reference - how to reference it in your UI project
<CommonControls:PolicyTab runat="server" ID="temp"></CommonControls:PolicyTab>
Web.config - what you need to import this control into all of your UI pages
<add tagPrefix="CommonControls" namespace="MyProject.Common.Controls" assembly="MyProject.Common"/>
I have the following line in my master page:
<td valign=top runat="server" id="navBar">
And then in the master page code behind we reference it and do something with it:
public void HideNavbar()
{
navBar.Visible = false;
tdMain.Attributes["class"] = "MainWrapper";
}
But for some reason when we copied this master page from a Web Site Project to a WAP project, it doesn't know what navBar is. It's not referencable in code-behind anymore.
Does the designer file need an entry for this? And what would that possibly be if I have an id in a ?
Another thing you could try is to delete the designer file, then right click on your master page and click on "Convert to Web Application." That will force a re-gen of the designer file, and pick up the new controls that have gotten out of sync with the designer file.
This specific issue is on my list of top reasons that I don't like Web Application Projects.
The move to a WAP may have messed up the class for your master page.
Try adding a protected control decleration within your master page. In VB this is:
Protected WithEvents navBar as HtmlTableCell
I'm not totally sure this is correct, but it would be my first guess.