I'm very new to ASP.net, and I had to fix a issue in and ascx file (It was just an html fix). When I got ready to put the code back into the repository I checked the changes in the Designer.cs file. They don't seem to match up with the changes in the ascx file.
Ultimately where do I see the errors for designer files? Will I see them when I build? When I view the page?
Thanks.
That's an interesting question with multiple scenarios. Assuming in your markup you have <asp:Label ID="Label2" but in Designer.cs you have protected global::System.Web.UI.WebControls.Label Label1;:
Scenario #1
You do not access Label1 or Label2 anywhere else.
No errors will happen.
Scenario #2
You set Label1.Text = "Test" in the code-behind file, or you set some control attribute to Label1 (such as
You get a runtime exception.
Scenario #3
You set Label2.Text = "Test" in the code-behind file.
You get a build error.
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.
I have Website project, which contains some .ascx and .aspx files. I have added new element <asp:TextBox ID="tb1" runat="server" ... /> in .ascx file and I have wrote some code in proper .ascx.cs file using this element: tb1.Text = "SomeText";. When I compile this project I recieve following error: The name 'tb1' does not exist in the current context.
How can I force to refresh markup of .ascx page? I use Website project and I cannot to change its type to Webapplication.
UPD: I have Website project, which has NOT .ascx.designers.cs files. And I cannot change type of my project to web application.
Unless there's something else happening here, it sounds like the designer.cs file might be out of sync. Try cutting and pasting the control back into the markup, or go into the designer file for the user control and add the TextBox manually:
protected global::System.Web.UI.WebControls.TextBox tb1;
It seems like your design file is not connecting with your code behind file.
Can you confirm if you are defining it as follows,
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="yourcontrol.ascx.cs" Inherits="CompleteNameSpace.ClassName" %>
I get the error
Handles clause requires a WithEvents variable defined in the containing type or one of its base types.
in the following code..
Public Sub selCurrentManuf_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles selCurrentManuf.SelectedIndexChanged
End Sub
The drop list to go with it is the following...
<asp:DropDownList
OnSelectedIndexChanged="selCurrentManuf_SelectedIndexChanged"
selectedvalue='<%#Container.DataItem("c1_manufidcurrent")%>'
ID="selCurrentManuf"
Runat="Server"
DataTextField="c4_Desc"
DataValueField="c4_manufid"
DataSource="<%# GetCurrentManuf() %>"
autopostback="true"
></asp:DropDownList>
I've gotten this error when for some I've renamed a field. For some reason sometimes the designer messes up and doesn't rename it in the form.aspx.designer.vb file, if you look in there and fix the name it can fix this issue if that has happened to you.
So double check that the field name is the same in your even handler, the aspx file and the designer.aspx files.
I had encountered this issue when upgrading a legacy page. The problem is in the Inherits attribute #Page directive has the wrong namespace.
Correct the namespace for Inherits attribute
Remove the namespace in the designer file or match with it in the designer code
I had this happen on the OnClick event for a button. I originally the button inside a panel inside of an ItemTemplate for a gridview column. I only needed the panel to popup on some other buttons OnClick event so I didn't really need it repeated through out the grid. It was hidden anyhow. I moved the panel outside the gridview all together and the error went away.
When converting a legacy Web Sites Project to a Web Application Project type, when following these directions, after converting the application, it created a bunch of .aspx.designer.vb files for me but didn't include them in the project. So I clicked on the project root in solution explorer, pressed the * key to expand everything, then multiselected all of the designer.vb files and right-clicked then said 'include in project'. Then it was able to see the types and the compiler lived happily ever after.
THE END
I had this happen when I created a command button. When I let VB.net create the event I was immediately greeted with that error.
What I did to fix it was deleted the object in the designer (a command button in my case), the code tied to it, saving my .sln & recreating the object. Problem solved.
I had this error on a handler function for an ASP button on vb.net. Solved by adding
runat="server"
to the enclosing form tag
<form name="formUpdate" method="post" id="frmUpdate" runat="server">
<asp:Button ID="btnUpdate" runat="server" Text="Update" />
</form>
I encountered this error in a solution while testing something. It is related to Designer.vb related to the form. Make sure that it was updated.
Error may like this in winform vb.net
solution:
Change this :
Public button3 As Button
TO:
Public WithEvents button3 As Button
Actually there is some fault in the designer. Closing and Re-Opening the solution fixes it
I got this error randomly 268 times in a solution that I hadn't changed. I closed and reopened the file and it seemed to fix it...
I am getting a compilation error on a website. There is a repeater declared in the aspx file as follows:
<%# Page Language="C#" AutoEventWireup="true" CodeFile="MyPage.aspx.cs"
Inherits="MyClass" %>
<asp:Repeater ID="rptMyRepeater" runat="server">
<ItemTemplate>
<tr>
<td>
…
And the class is defined as follows:
public partial class MyClass : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
rptMyRepeater.DataSource = GetMyDataSource();
rptMyRepeater.DataBind();
}
}
}
The problem I have is that rptMyRepeater is not recognised. Note that I copied these files in from another project, and so don't have a designer.cs file.
I came across this question which implies a "Convert to Web Application" would fix the problem. As I'm referencing a CodeFile rather than a CodeBehind, does this apply, or is there a better way? Is a designer file even necessary in this case?
If what you are saying is you don't have just the contents of designer.cs, add this to designer.cs:
protected global::System.Web.UI.WebControls.Repeater rptMyRepeater;
If you do not have a designer.cs file at all, add it to aspx.cs -i.e codefile- and it should work.
Simply this is the equivalent of what the designer file supposed to be doing, controls are not much different than class variables as I see.
A couple of things you could check:
Ensure that your .cs file is set to Compile in the properties
Try using CodeBehind instead of CodeFile
If your page class is inside a namespace then ensure it is fully qualified in the aspx file
If you are using a Web Application Project then right-click and Convert to Web Application
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.