I have a xaml page samplePage.xaml and its corresponding .cs file samplePage.xaml.cs. In this page there is a textBox textBox1.
Now I create an instance of the page:
PhoneApp1.samplePage s = new PhoneApp1.samplePage();
and after that, I would like to set the value in the text box by calling:
s.textBox1.Text = "whatever"
but it turns out there is an error message saying
'PhoneApp1.samplePage' does not contain a definition for 'textBox1'
and no extension method 'textBox1' accepting a first argument of type
PhoneApp1.samplePage' could be found (are you missing a using
directive or an assembly reference?)
I would like to know how to get the xaml element using C# code?
You textbox is probably private or protected. Add a wrapper in your page to expose the textbox, something like :
public TextBox TextBox1
{
get
{
return this.textBox1;
}
}
(mind the case)
Then just use the property from anywhere you want: s.TextBox1.Text = "whatever";
Good question, you'll need to use XamlReader.Load to load your page/control at runtime, then you'll be able to access the controls within it:
http://msdn.microsoft.com/en-us/library/cc189076(v=vs.95).aspx#using_xamlreaderload
http://blogs.silverlight.net/blogs/msnow/archive/2008/10/09/silverlight-tip-of-the-day-60-how-to-load-a-control-straight-from-xaml.aspx
Related
I am trying to load a pdf into a axAcroPDF using this method that I found here. but there isn't a this.axAcroPDF.LoadFile() there. The error message that I get says:
"AxacroPDFLib.AxacroPDF doesn't contain a defection for 'LoadFile' and
no Extension method excepting first method of a type
AxacroPDFLib.AxacroPDF could be found (Are you missing a using
directive or an assembly reference?"
So I double checked and there are Acrobat , AcroPDFLib, AxAcroPDFLib Referances in the WPF and user control.
Next I goggled this again and found this on YouTube that uses this.axAcroPDF.src =path; however I do not this option either. Please tell me if they have changed the LoadFile(path) to something else, or if there is a reference that I am missing?
axAcroPDF1.LoadFile(PDFPath.ToString());
axAcroPDF1.setShowToolbar(false); //disable pdf toolbar.
axAcroPDF1.Enabled = true;
Another solution is to set the src property of your Axacro control.
I'm using DDRMenu in DotNetNuke to select a menu node from my site structure and display only a subnode in a specific navigation in my template
<%# Register TagPrefix="dnn" TagName="MENU" Src="~/DesktopModules/DDRMenu/Menu.ascx" %>
<dnn:MENU ID="MenuFooter" MenuStyle="MenuFooter" IncludeHidden="true" NodeSelector="FooterNavigation,0,1" runat="server" ></dnn:MENU>
Now I want to be able to set the NodeSelector attribute in the code behind file, because I want to be able to dynamically set the value on Page_Load
// load footer navigation node from a config file
protected void Page_Load(object sender, EventArgs e)
{
var footerNode = Config.Instance.Navigation.FooterNode;
MenuFooter.NodeSelector = footerNode + ",0,1";
}
But this doesn't work, as there is no NodeSelector attribute on System.Web.UI.UserControl.
Error 'System.Web.UI.UserControl' does not contain a definition for 'NodeSelector' and no extension method 'NodeSelector' accepting a first argument of type 'System.Web.UI.UserControl' could be found (are you missing a using directive or an assembly reference?) C:\Projects\eWolf2012\dev\DNN\Portals_default\Skins\JWEwolfSkin2012\Simple.ascx.cs 141 24 JWEwolfSkin2012
Is there any way to achieve this?
Kind regards
Usually the Menu.ascx in DDRMenu inherits from the DDRMenu SkinObject:
<%# Control Language="C#" AutoEventWireup="false" EnableViewState="false" Inherits="DotNetNuke.Web.DDRMenu.SkinObject" %>
Since you are talking about changing the code behind I guess that you are using a custom control that embeds the Menu.ascx. In which case you should be able to access the NodeSelector property since it exists in the SkinObject class.
What I am suspecting is happening is that your control type is not loaded correctly by the designer, and that it falls back on the UserControl type which doesn't have the NodeSelector property.
Try the following:
Include the DDRMenu assembly in your current project (because it won't load the type if it doesn't find the assembly), then rewrite the include to kick the designer into motion. I'm pretty confident this is the cause of the problem, but if not:
Fiddle with your src attribute and check in the *.designer file what type is defined.
Define it manually in your code-behind file instead of letting the designer do it.
I have a control I 'created' in XAML that I want to access through the Code Behind.
<wincontrols:LiveTileFrameElement Name="PendingAuthsFrame1" Text="Pending" />
this.PendingAuthsFrame1.Text = "334";
However, I get a Build Error on the second statement above stating MyApp.MainWindow does not contain a definition for 'PendingAuthsFrame1' and no extension method....
it keeps going but you get the idea I'm guessing.
What am I missing or doing wrong?
Use x:Name instead of Name. That should do the trick.
How can I add an image on buttons of button array ?
Button[] mybuttons = new Button[] {Button1,Button2}; //My button array
mybuttons[1].image=new Bitmap("Click.jpg"); ///Gives Error
'System.Web.UI.WebControls.Button' does not contain a definition for 'Image' and no extension method 'Image' accepting a first argument of type 'System.Web.UI.WebControls.Button' could be found (are you missing a using directive or an assembly reference?)
C# is case sensitive. Also, you need to use an ImageButton and give it an ImageUrl, not a Button. The web control Button does not have an Image property.
I'm adding a User Control for each record pulled up in a data reader, here's the basic loop:
while (dr.Read())
{
ImageSelect imgSel = new ImageSelect(dr["Name"].ToString());
myPanel.Controls.Add(imgSel);
}
The problem is that there are no controls added to the page, I check the html output and there is my panel, with nothing in it.
I even stepped through the code in the debugger, and verified that myPanel.Controls gets a control added on each loop, with the count being 6, no errors, but then they dont show up on the page.
I've run the above code in the Page_Init and Page_Load events, both with the same result.
EDIT:
Ok so I've switched to using LoadControl("....ascx") to get my control instance, which is now working. But originally I was also passing in data via the controls constructor.. Is this still possible or do I just need to set them via get/sets?
EDIT 2:
Thanks to Freddy for pointing out that the LoadControl has an overload where you CAN pass in constructor params, see accepted answer.
EDIT 3:
After trying this method both with and without the constructor. I have found its better to just use setters for any properties I want the control to have versus trying to use the passed in object array for my constructor.
Update: As Steve pointed out, the overload of LoadControl that uses the type won't take into account the controls in the ascx. This is also mentioned in this answer: Dynamically Loading a UserControl with LoadControl Method (Type, object[]).
As I mentioned before, the get/set are more in line with the asp.net model, so I recommend using that with the LoadControl variation that receives the user control path. That said, the Steve's version is an interesting alternative: http://www.grumpydev.com/2009/01/05/passing-parameters-using-loadcontrol/.
My take is the LoadControl with type is meant to be used with web custom controls instead.
If it is an user control you should use LoadControl(usercontrolpath) to get the instance of the user control.
You can use a constructor by doing:
var name = dr["Name"].ToString();
var imgSel = LoadControl(typeof(ImageSelect), new object[]{ name });
myPanel.Controls.Add(imgSel);
Notice that depending on the project model you are using, you need to add a Reference to the aspx to use it with the typeof variation:
<%# Reference Control="~/somepath/myusercontrol.ascx" %>
Ps. I usually use the set/get for controls as I find them more in line with the asp.net model
To add UserControls you must call the LoadControl method passing in the path to the .ascx file. You can not create them by just instantiating the object the .ascx file inherits from.
A UserControl consists of both the markup and the class in the code behind. The markup contains a link to the class behind, but the class behind does not know where the markup lives and therefore can not be created on it's own.