Web Forms :: Use System.Drawing.Bitmap Class Into Other Class?
Oct 5, 2010
How can I to use System.Drawing.Bitmap class into athoer class?
using System.Data;
using System.Collections;
using System.Globalization;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
namespace University
{
public class Class1
{
System.Drawing.Bitmap BMP=new System.Drawing .Bitmap();
}
}
when I use System.Drawing.Bitmap gives error this class does not exists
I am trying to built a WebForm with module where the user can see himself in his webcam. I am using AForge.NET framework to control the webcam.
AForge returns every frame as Bitmap object (System.Drawing.Bitmap) and now i have to display it in my WebForm. In the Windows form I would achieve it by assigning Bitmap to the PictureBox control but how do i do it in WebForm? There is only Image control avilable (System.Web.UI.WebControls.Image) which doesn`t have any .Source propery apart form .Url. How do I display Bitmap object on the page ?
I have this Control directive in a usercontrol (i've changed the namespace and class name):
<%@ Control Language="C#" AutoEventWireup="true" Inherits="Namespace.Path.To.ClassName" %> <asp:TextBox runat="server" ID="txtComment" TextMode="MultiLine" ValidationGroup="comment" /> ClassName is a class that lives in a class library and this is the class: namespace Namespace.Path.To { public class ClassName : System.Web.UI.UserControl { protected System.Web.UI.WebControls.TextBox txtComment; protected void Page_Load(object sender, EventArgs e) { HttpContext.Current.Response.Write(txtComment == null); HttpContext.Current.Response.End(); }
I have build a UserControl with separate code behind file.In that code behind file i have defined some public properties in the Partial class of user control that was automatically generated.Those properties will initialize some properties of controls that are used in the control.Now, in .aspx page i used this User Control and initialized the public properties through code behind of aspx page for dynamic contents.
I'm working on an ASP.NET MVC application, but I'm trying to remove everything but Controller code from my project and put it in it's own Class Library. I've got some code that is using System.Web.Mvc; But it doesn't seem to be letting me access it. I have Referenced the System.Web Namespace in the project. Bassically I'm getting errors on the iActionFilter and the FilterAttribute stuff.
I'm working on a webservice that needs to be contacted from different clients. Since I never know what language the client will be using I was wondering if every language can retrieve and pass a Class of the type "System.Net.CookieContainer". Ex: I have a webservice that authenticates a client and returns a CookieContainer (this can be passed in the following requests). This way I can keep that session active.
Client 1 will use .net (this works obviously). Client 2 will use php (will this work?). Client 3 will use java (will this work?).
The reason why I would like to use this is because a user can authenticate with our webservice and in the following requests he doesn't need to do the authentication again. After some searching arround I've found the CookieContainer solution.
I tried every trick in the book, creating a new object, instantiating it (even tho it says i can't) and just trying to create a reference to use it, and then also trying to call the .Address value inside it while using it like i would use a shared member (without instantiation) and nothing is working, msdn sample/help is useless... i even tried inheriting it and useing it like that, none of them worked, i am sure i am missing something, can anyone give me some code samples? here is the msdn docs on it to to give you an overview...http://msdn.microsoft.com/en-us/library/system.net.networkinformation.gatewayipaddressinformation.aspxalthough i like vb.net more i can read and coded in both c# and vb.net so either will be fine.an aside: if anyone is wondering why, im just trying to get my routers name/label from a pc as shown here... http://stackoverflow.com/questions/3839189/how-to-get-router-name-ip-as-shown-in-windows-network-tab-in-code
I wanted to create a custom class that inherits from System.Exception and adds a few properties and methods specific to the project.
The issue I'm seeing is that a standard try/catch block catches generic Exception class and the compiler thinks that converting that to my custom class is OK. However, at runtime if the actual error is something else like a a System.Net.WebException for instance, then at runtime it will not convert to my custom class. Then my own error catch throws an InvalidCastException.
Obviously the one thing I don't want to happen is to have my error logging methods throw errors on their own...
So, how can I convert ANY exception to something that my custom class can use?
Here's a code example:
Csharp Code:
[code]....
Now, this code builds just fine... VS2008 and VS2010 have no issue with converting an "Exception" to "MyErrorClass", but at runtime it certainly doesn't like converting a "WebException" to "MyErrorClass"...
First off, I am wondering if this is possible. I read slight grumblings around the internet about this, but I was not entirely sure.
My scenario: I have a base chart class which has some methods which all charts should have.
public partial class BaseChart : System.Web.UI.UserControl { public BaseChart() { } public void ToggleLegend() { Chart1.Legends[0].Enabled = !Chart1.Legends[0].Enabled; } }
There is also some mark-up for this BaseChart -- setting background colors, etc. All charts which inherit BaseChart should use this starting mark-up and be able to build upon it.
I would then like to do this:
public partial class HistoricalLineChart : BaseChart { public HistoricalLineChart() : base() {
I'd like to be able to determine what class will be called given an URL. For instance, I have a page /First.aspx that has a hyperlink to /Second.aspx In the code behind for First.aspx.cs, I'd like to be able to determine what class will execute if someone clicks on the hyperlink that points to /Second.aspx.
EDIT: One of the reponders asked me to outline the problem I'm trying to address. Here it is: The codebase I inherited has a subclass the System.Web.UI.Page that has a public Authorized method that returns a boolean. The Authorized method checks the parameters passed via the query string against the authenticated user, and determines whether that user should be allowed to call that page with the given parameters.
Elsewhere in the site I have hyperlinks that reference those protected pages. In some instances those links are displayed to users who are not authorized to navigate to that page. They can click the link, however they get an error. In other instances, prior developers when through the trouble of inserting logic that hides the hyperlink for those unauthorized users, but the authorization logic is duplicated (In the page itself, and in the linking page). What I would like to do is create a subclass of the hyperlink class, and have the subclass inspect the NavigateUrl, determine the destination page class, and call the Authorized method of that class to determine if the user is authorized to call that page. If the user is not authorize, the link will automatically hide itself.
I'm migrating a piece of functionality from my App_Code directory to a separate project that's going to build a class library to be referenced by my web app. One of my classes in the App_Code piece inherits form System.Configuration.ConfigurationSection, like so:
Imports System.Configuration Imports System.Web.Configuration Imports Microsoft.VisualBasic Namespace P10.WebStore #Region "WebStore Section" Public Class WebStoreSection Inherits ConfigurationSection
I absolutely cannot get the project to recognize ConfigurationSection as a class. Nothing I google about this class mentions having to do anything special to use it. Is it because this is a class library and not an .exe or somethign?
Since we can access the private data member of base class in the derived class with the help of friend function. How can we do the same in C# asp.net? I mean whats the alternative of friend function in C# asp.net
Using the following Webservice definition using aClientArgs as a complex type:
[System.Web.Script.Services.ScriptService] public class Controller : System.Web.Services.WebService { [WebMethod] public void save_client(aClientArgs client) { // Save client data } } Then defining aClientArgs as a sub-class: public class aArgs { public string id = null; public string name = null; } public class aClientArgs : aArgs { public string address = null; public string website = null; } Returns the following WSDL fragment for the save_client args: <save_client xmlns="http://tempuri.org/"> <client> <address>string</address> <website>string</website> </client> </save_client> When I'm expecting the following: <save_client xmlns="http://tempuri.org/"> <client> <id>string</id> <name>string</name> <address>string</address> <website>string</website> </client> </save_client>
So it appears that the .NET WebService is not treating inherited properties as arguments/variables for purposes of a web service. How do I get .NET to also use the properties of the base class?
Does anyone know what could be the reason I am not able to add reference to System.Web. It gives an exclamation(!) symbol in front of the dll under reference folder in VS 1020. I wand to refer to System.Web.Security.MembershipProvider class.
I first need to apologize in case this has been answered before but I'm a newbie (green as they come) and this error keeps popping up even before I start debugging! There are two errors and the second one is:" Error 2
Missing partial modifier on declaration of type 'WFPKenya2.WFPKenya2'; another partial declaration of this type exists"
I'd like to inherit all my controllers from a custom base class that I write myself. I can change the line every time I add a new controller, but it would be nicer if I could somewhere specify the default value that gets set there. That way I wouldn't need to worry about forgetting this, and other people who get added to the project later on would have an easier time.
am using class diagram of visual studio 2008as you can see the image i need show to user that the period and calendar classes have the idMarket property that refers to market classhow can i do this?
In my MVC project, I am trying to setup a base product class that will be inherited by a more specific class later. Here is my scenario. I have a table called ProductBase, it contains three fields, BaseProductId(PK), CatalogNum, and ListPrice. Every product in the system will share these attributes. Next, I have a table called Shirt, with three fields BaseProductId(PK, FK), Color, and Size.
I then setup an Entity Data Model that pulled in both of these tables and created classes BaseProduct and Shirt. So, in my model, I want to do something like this:
[Code]....
The main problem I have with this, is that if I do any kind of condition on CatalogNum or ListPrice, then my performance goes to crap. One of the main things we will want to do is something like this:
[Code]....
This takes an enormous performance hit, and I suspect it is because the partial class above returns to the database for each shirt.
The other problem I have with this approach, is that I cannot force the properties for the Shirt. What if I make a change to the BaseProduct? What happens when I have multiple product types, will I have to repeat this code? I assume I will need to make a change with the entity data model, but I am unsure where to begin.
I have a byteArray which I can only convert into an Image (Drawing.Image) I was wondering how I can display it a webpage. I used memoryStream as I dont want to user to have to download the image. Eventually I will use this to display images in google maps.. I can convert it into a graphic but once again not sure what I will do with it. The Error I have been getting lately is Cannot implicitly convert type 'System.Drawing.Image' to 'System.Web.UI.WebControls.ImageField'
