C# - Create An Instance Of A Web Control Using Reflection?

Oct 20, 2010

How can I create an instance of a web control at runtime using reflection? I created a series of controls that implement a common interface and I would like to create these controls based on the name of the control which is stored in my database.

I have attempted (and failed) to create an instance of these controls using Activator.CreateInstance in the following ways:

Activator.CreateInstance("MyUserControl")

and

Activator.CreateInstance("ASP","controls_myusercontrol_ascx")

...and both return null.

I've also attempted to simply get the type of the control by trying..

Type t = Type.GetType("controls_myusercontrol_ascx");

and

Type t = Type.GetType("MyUserControl");

...and it returns null.

If I explicitly declare an object as controls_myusercontrol_ascx or MyUserControl, there is no issue -- but it can't be found with reflection.

Is it possible to create web user controls using reflection at run time? If so, how can I?

View 1 Replies


Similar Messages:

C# - Trying To Create Instance Of Class By Using Reflection

Apr 16, 2010

I am trying to create instance of class by using reflection in ASP.net web site. Class ClassName is defined and located in App_code folder. Following line returns null, what could be wrong.

Type type = Type.GetType("NameSpace.ClassName", false, true);

View 5 Replies

C# - Create A New Instance Of A Type Without Reflection?

Jan 14, 2011

I have a function that at the moment takes a Type variable. This function sticks it in a list and such and eventually needs will create a class of that type. Right now I do that with

object o=MyType.GetConstructors()[0].Invoke(new object[0]);

which is pretty hacky and also will not work in medium trust due to reflection(I think). Is there a better way of doing this without reflection? The Type is defined this way as part of a function. I need the class to be created "lazily" because it may not be created in the application if it's not needed. I use it for example like

AddToList(typeof(Whatever));

Note, I'm open to suggestions on changing the function calling. I just need the object to be created lazily and for to store the type(or however to create an object of the type) in a list.

View 3 Replies

C# - Creating A Generic IList Instance Using Reflection?

Feb 4, 2010

I am trying to create a generic list of objects using reflection. The below code throws an error Cannot create an instance of an interface. . I could change the IList to List and it works fine, but I was wondering if there is way to get this working with an IList.

var name = typeof (IList<T>).AssemblyQualifiedName;
Type type = Type.GetType(name);
var list = Activator.CreateInstance(type);

View 8 Replies

How To Set Text Property Assigned To The Control Created Dynamically Using Reflection

Sep 27, 2010

how to set text property assigned to the control created dynamically usiong reflection?

Type type = Type.GetType(strFullName);

object instance = Activator.CreateInstance(type);
ctrlTemp = (Control)instance;
ctrlTemp.ID = "Hello";
ctrlTemp.Text???
Panel1.Controls.Add(ctrlTemp);

View 2 Replies

Web Forms :: Change Action Attribute With Control Adapter Class But Without Reflection

May 24, 2010

I am facing challenge of changing action attribute of html form tag. As my application is on shared hosting (medium trust) environment of godaddy server, I cannot use reflection to get control adapter of html tag page. So, I cannot use the following code in my Url Rewriting module.

[Code]....

Is there any otherway to implement the same functionality without reflection?

View 4 Replies

SQL Server :: How To Create The New Instance Along With PC Name

Sep 26, 2010

I have a question regading sql name instance ???

When ever i create new instance in sql server 2005 , it use to create the new instance along with my PC name.

For Eg :

My PC Name is Web and New instance name is Busiwork it use to create like WebBusiwork. But i need just the sql instance name of my server as Busiwork.

View 5 Replies

How To Create New Instance Of An Object

Aug 5, 2010

As some may be aware, I recently posted about high memory usage on my website and I have an idea that my thumbnailer may have something to do with this as I am not actively disposing of the instance when it has been used due to my misunderstanding how it works.

I am now looking at my code for the thumbnailer and would like some advice on when something would actually need disposing of, is it ONLY when you create a new instance of an object?

Like:

Target := System.Drawing.Bitmap.Create(Trunc(Width), Trunc(Height));
MyImage := Target.FromFile(PhotoPath);

So, my question would be, do I need to dispose of both Target and MyImage to make sure the GC does what it needs to do properly?

View 4 Replies

C# - How To Create Instance Of A Class Only Once

Apr 4, 2011

A instance of a class is created in the partial class of an aspx page.Under page_load or button click method I'm trying to set the value to the class. but when each postback takes place new instance is created and I'm losing the previous value.

public partial class DatabaseSelection : System.Web.UI.Page
{
DBProperties dbpro;
Metadata obmeta;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
dbpro = new DBProperties();
}

View 4 Replies

C# - Use String Value To Create New Instance?

May 6, 2010

I have a few classes: SomeClass1, SomeClass2.

How can I create a new instance of one of these classes by using the class name from a string?

Normally, I would do:

var someClass1 = new SomeClass1();

How can I create this instance from the following:

var className = "SomeClass1";

I am assuming I should use Type.GetType() or something

View 3 Replies

How To Create Instance Of A Class Dynamically

May 21, 2010

I wanna do smth like this:

[Code]....

Does anyone have a recommendation how this is archievable? I am trying to pass in the Type to the method and then create an instace of it and then access the properties in it.

View 8 Replies

C# - How To Create New Instance Of A Page And Obtain URL

Aug 6, 2010

i'm a beginner web programmer. I've been coding desktop applications primarily. Right now, i have created this web app, in Silverlight, that uses a web service of my own for querying the database. The thing is, one of the app functionalities is the ability to open PDF files. I know that silverlight won't let you do this, but using an IFrame on top of the silverlight application you are able to display a page with de pdf file (using acrobat plug in). So here's the problem, my silverlight app passes the pdf path to the web service and, in return, the web service would create a new Page and pass the new page URI back so that it can be displayed on the IFrame:

[Code]....

View 1 Replies

C# - Create And Instance Of MyClass Using The Type?

Sep 24, 2010

Bit of a puzzler, I have a generic class

public abstract class MyClass<T> : UserControl
{
}

and I have got a type like this

Type type = Type.GetType("Type From DB as String", true, true);

and I want to create and instance of MyClass using the type... But this doesn't work.

MyClass<type> control = (MyClass<type>)LoadControl("/UsercControl.ascx");

View 4 Replies

Create A Usercontrol Instance Programmatically?

Feb 16, 2011

I have a UserControl that I need to add dynamically. I tried to follow this MSDN article, but I'm not having any success....[URL]

The UserControl is basically an image gallery, and it loads some pictures based on an ID. My idea was to make this ID available as a property. Then when I create an instance of the control, I could set this ID and add it to the form.

I added a reference to the control in the .aspx page that will use it, like this:

<%@ Reference Control="~/PictureGallery.ascx" %>

And in the UserControl I added a ClassName like this:

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="PictureGallery.ascx.cs"
Inherits="PictureGallery" ClassName="PictureGallery" %>

When I try to create an instance in the .aspx.cs like the article suggests, Dim gallery As ASP.PictureGallery, I get an "Type ASP.PictureGallery is not defined".

The article mentions a namespace, ASP, and I tried importing it to the .aspx.cs with no luck. So, I'm not able to get a reference to the UserControl.

View 3 Replies

MVC :: Razor - Create Instance Of View?

Oct 12, 2010

In my controller method, I'm trying to create an instance of a View (cshtml file) before I wrap it around an ActionResult and return it.Since there is no "class" for Razor Views to speak off, how does one go about creating an instance of a Razor View?

View 25 Replies

C# - Cannot Create Instance Of Abstract Class?

Mar 31, 2010

I am trying to compile the following code and i am getting the error:

Cannot create instance of abstract class .

m_objExcel = new Excel.Application();
m_objBooks = (Excel.Workbooks)m_objExcel.Workbooks;
m_objBook = (Excel._Workbook)(m_objBooks.Add(m_objOpt));
m_objSheets = (Excel.Sheets)m_objBook.Worksheets;
m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(1));
// Create an array for the headers and add it to cells A1:C1.
object[] objHeaders = {"Order ID", "Amount", "Tax"};
m_objRange = m_objSheet.get_Range("A1", "C1");
m_objRange.Value = objHeaders;
m_objFont = m_objRange.Font;
m_objFont.Bold=true;
// Create an array with 3 columns and 100 rows and add it to
// the worksheet starting at cell A2.
object[,] objData = new Object[100,3];
Random rdm = new Random((int)DateTime.Now.Ticks);
double nOrderAmt, nTax;
for(int r=0;r<100;r++)
{
objData[r,0] = "ORD" + r.ToString("0000");
nOrderAmt = rdm.Next(1000);
objData[r,1] = nOrderAmt.ToString("c");
nTax = nOrderAmt*0.07;
objData[r,2] = nTax.ToString("c");
}
m_objRange = m_objSheet.get_Range("A2", m_objOpt);
m_objRange = m_objRange.get_Resize(100,3);
m_objRange.Value = objData;
// Save the Workbook and quit Excel.
m_objBook.SaveAs(m_strSampleFolder + "Book2.xls", m_objOpt, m_objOpt,
m_objOpt, m_objOpt, m_objOpt, Excel.XlSaveAsAccessMode.xlNoChange,
m_objOpt, m_objOpt, m_objOpt, m_objOpt);
m_objBook.Close(false, m_objOpt, m_objOpt);
m_objExcel.Quit();

View 2 Replies

How To Create Multi Instance Application In Azure

Feb 6, 2010

I want to create multiinstance application in Azure. and then demontrate that if one of the instance is down other instance is working fine. How should I achive that.

View 1 Replies

Cannot Create An Instance Of A COM Component On A Server Side

Jul 20, 2010

I'm trying to use MS IME on a server to retrieve some Japanese info in a silverlight app. The app accesses to the server by using WCF, but when calling a CoCreateInstance to create a IFELanguage2, it gives me -2147467262. The same code I'm using on the server actually works pretty fine on a WPF app.

Here is the code,

// ...omit
Guid imeGuid;
int errCode = Ole32.CLSIDFromString("MSIME.Japan", out imeGuid);
WinBase.CheckError(errCode);
Guid feLangIID = new Guid(Constants.IID_IFELanguage2);
IntPtr ppv;
errCode = Ole32.CoCreateInstance(imeGuid, IntPtr.Zero, Ole32.CLSCTX.CLSCTX_ALL, feLangIID, out ppv);
WinBase.CheckError(errCode); // errCode is 2147467262
IFELanguage IfeLanguage = Marshal.GetTypedObjectForIUnknown(ppv, typeof(IFELanguage)) as IFELanguage;
errCode = IfeLanguage.Open();
WinBase.CheckError(errCode);
// ...omit

Do I need to setup anything to use the MS IME on a server side? I'm running the app on the following environment, IIS7 .NET Framework 4.0 Windows 7 pro 64 bit VS2010

View 1 Replies

MVC :: Cannot Create An Instance Of The Abstract Class Or Interface?

Dec 12, 2010

Error 1279 Cannot create an instance of the abstract class or interface 'System.Web.Mvc.FileResult'

[Code]....

I am using MVC 2. The same code works in my onather application. I have no idea about this error.

View 2 Replies

Web Forms :: Use The New Keyword To Create Object Instance

Sep 18, 2012

I am trying to get dropdownlist value in cs page but getting error "Use the new keyword to create object instance".

DropDownList tn = (DropDownList)Page.FindControl("DropDownListTRAIN_NO");
string t1 = tn.SelectedValue.ToString();

View 1 Replies

Web Forms :: Trying To Create An Instance Of System.Web.HttpResponse To Send The Uers To Another Website?

Jul 11, 2010

I am trying to create an instance of System.Web.HttpResponse to send the uers to another website.I am doing some other stuff in my vb.net that does not let me use the regular Response.Redirect.when I do Dim myRsp As System.Web.HttpResponse = New System.Web.HttpResponseit complains about a textwriter.

View 4 Replies

Forms Data Controls :: Create An Instance Of A TextBox In A GridView When Using FindControl?

Dec 28, 2010

In my GridView I use FindControl/<FooterTemplate> with a TextBox that you can enter an integer with a comma

into the TextBox, because I create an instance of the Textbox first and then remove the comma out of the integer before the TextBox is used to update the table in the database.

However once the data is in the table and displayed in the GridView if you try to change the integer and use a comma in the GridView you cannot because FindControl/<EditItemTemplate> will not create an instance for you to remove the comma from the integer before it updates the table because FindControl/<EditItemTemplate> doesn't allow you to create an instance of the TextBox first, instead when you try to use the instance that looks like was created it gives an error stating:

Object reference not set to an instance of an object.

So the question is:

HOw do you create an instance of a TextBox in a GridView when using FindControl/<EditItemTemplate>?

<form id="form1" runat="server">
<div>
</div>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">

[Code]....

View 2 Replies

Visual Studio :: Vs Asp2008 Instance Cant Recognize SqlExpress 2008 Instance On Machine

Feb 6, 2010

vs asp2008 instance cant recognize the sqlExpress 2008 instance on my machine

I have wonder if you could try to help me with the fallowing issue:When trying to add a new sql server connection (local or remount) from VS(visual studio) 2008 express - on the add connection dialog

box: server name: are Empty!!
The vs couldn't point to any database, like dont recognize the sqlExpress 2008 instance i got on my machine.

1. Have tried to "play" with sa property's(from sqlS: Databases: security: login tree folder) and with the sql

s windows service: stop and restart
2. And so with the target db.
3.

On the services.msc
The sql server express the status is started.
The sql server agent status is disabled and don't have the option to start.
The sql server explorer status is disabled and don't have the option to start.

4. And so reinstalled the asp.

View 2 Replies

C# - Best Way To Get Only Certain Properties Using Reflection?

Oct 21, 2010

I am trying to come up with the best way to get only certain properties from a type using reflection. How can I differentiate the properties from each other?

I understand that I can use binding flags or name. But say I want only a certain four properties. Would the best way be to create a custom attribute for the ones I want then loop through all of the properties to see if they have that attribute?

View 3 Replies

Web Forms :: Assign User Control From Another User Control ? Giving Error Object Reference Is Not Set An Instance?

Feb 17, 2011

I am trying to assign user control from another user control ..first time its binding control successfully but when we refresh the data its giving error

saying "Object reference is not set an instance".

how to refresh data from another user control ...

My senerio below :

1 Aspx page

2. User control

calling usercontrol databinding method from aspx page but once it get refreshed ,not allowed to bind it again..

View 2 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved