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");
How would I create an instance of a type if all I have is the type in string form?
[Code]....
Now if I wanted to create and instance of myType how would I do that ?
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.
why the first one is not working and second one is ok ?
if "This method is a shortcut for .bind('click', handler)" ( from jQuery documentation)
so why $('.myClass').bind('click', doSomething()); works fine ?
I have a basic question about comparing the type of a variable to a specific type. If I have variable A and variable B, both an instance of a certain type, then I know I can compare the types by getting A.GetType and B.GetType, I can also use IsAssignableFrom and IsSubclassOf for more advanced things. However if I only have variable A and I want to know if variable A is of type MyCustomType, as I see it now I first have to create an instance of MyCustome Type, get the type from it and then compare it to the type of A like in the next Example:
string A = "test";
MyCustomType B = new MyCustomType();
Type typeToCompare = B.GetType();
if (A.GetType().FullName == typeToCompare.FullName) {...}
So if I need to know if A is of MyCustomType isn't there an easyer, shorter alternative that I can just try something like the following (which is ofcourse not possible):
if (A.GetType == MyCustomType....) {...}
so without first having to create an instance of the type simply to extract the type from it.?
I'm trying to create a validation layer that will contain methods to validate all my objects (in my Business Objects layer) .. but when I try to reference both the validation and business objects to each other I get a circular dependency error .. so I've decided to create a new layer (BLL) to validate the objects for me and I'll be able to reference both the validation and the object layers.
so I want to build some kind of class/interface -I don't know what fits more- to be like a generic type or a parent type that my method could accept it as a parameter and check for it's Name/ID property. Instead of defining a new method overload for each object type I have
Simplification
I've got an application that loads an assembly dynamically:
Assembly asm = Assembly.Load("MyClass.DLL");
Type type = asm.GetType("MyClass");
MyClass runningAssembly = (MyClass)Activator.CreateInstance(type);
[code]...
I am struggling to find relevant documentation on this, what I basically want to do is to create a 'hyperlink' type and a 'pdf' type that I can put into my XML file and use to link to a webpage or a PDF, with the relevant icon.
Here is my JQuery :
[Code]....
And my XML :
[Code]....
I've created a new class in App_Code
namespace Site {
public class MyClass {
public MyClass() {
}
}
}
this is my Global.asax.cs
[code]....
The error is in: MyClass myClass = new MyClass();
The type or namespace name 'MyClass' could not be found (are you missing a using directive or an assembly reference?)
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.
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?
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();
}
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
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.
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]....
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);
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.
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 RepliesHow 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?
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();
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 RepliesI'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
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.
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();
I want to store into my xml data type column some french characters with accent e.g "é, à , è". The header of my xml file use the encoding style encoding="ISO-8859-1"
My file is the follow :
<?xml version="1.0" encoding="ISO-8859-1"?>
<Magazine DateParution="13-03-2011" Numero="150">
<Title> La chutte du président Osni Mobarack</Title>
<Articles>
<Titre_Article>
Au secours des collèges
</Titre_Article>
<Note_Article>
L'article montre la capitale... </Note_Article>
<Page_Article>1</Page_Article>
</Articles>
</Magazine>
When i store this data into my database using Insert into statement, all the characters with accent are replace by a question mark. for instance get "Au secours des coll?ges"
What can i do in order to SQL Server accept the international characters like french's