I've made a little game in silverlight that records users scores whilst they play.
I decided it would be a lot better if I could implement a leaderboard, so I created a database in mySQL to store all the high scores along with names and dates. I have created some communications to the database in ASP.net. This works and I can simply insert and get data within the code.
It's now time to link the silverlight project with the ASP.net database communications, so I can send the users name and score as variables to my ASP.net code and then it will upload it to the database. That's all I need. Surely there must be an easy way of doing this, I just can't seem to find any ways when researching.
Thanks in advance,
Lloyd
At first you need add Generic Handler to your ASP.Net project.
public class Handler1 : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
string userName = context.Request["user"];
int score = int.Parse(context.Request["score"]);
//And store it in DB
}
}
After you need call this handler from SilverLight app:
string uri = HtmlPage.Document.DocumentUri.ToString();
// Remove the web page from the current URI to get the root URI.
string rootUri = uri.Remove(uri.LastIndexOf('/'),
uri.Length - uri.LastIndexOf('/'));
string diggUrl = String.Format(rootUri + "/" + "test.ashx?user={0}&score={1}", "testuser", "234");
// Initiate Async Network call to Digg
WebClient diggService = new WebClient();
diggService.DownloadStringAsync(new Uri(diggUrl));
here i used Uri Class to send parameter to asp.net, but you can send string format only.
// this code written on Silverlight Button Click Event.
Uri myURI = new Uri(HtmlPage.Document.DocumentUri,String.Format("Report.aspx?brcd={0}&acc={1}&user={2}", Brcd, Acc, User)); HtmlPage.Window.Navigate(myURI, "_blank");
below code is written on Asp.net page_load or page init event
Brcd = Request.QueryString["brcd"];// brcd value accept here.
acc= Request.QueryString["ACC"];`
user= Request.QueryString["User"];
in above code we accept the silverlight parameter in asp.net but in [] bracket put name as it is use in silverlight page because it case sensitive.
By ASP.NET, do you mean an ASP.NET Webforms app?
If so, an ASP.NET Webforms app is a method of building a UI. What you need is an API, for your Silverlight app to use programatically. For this purpose you may want to consider building an ASP.NET Webservice instead, which provides an API over HTTP.
What do you need its to send data to web server from a Silverlight application, right?
You can:
Call Javascript functions from Silverlight and, there, do a postback
Call web services with Silverlight, but make sure its in same server which your SL application came from, or you will face some XSS issues.
An easy way to do this is to have your Silverlight code create a REST URL by encoding the information into the query string, and invoking an .aspx page on the server. The page wouldn't need to return any markup; it would just handle the back-end stuff and return.
Alternatively, you could make a web service call from Silverlight to your back end.
I prefer the latter approach. It's a little more work the first time through, but it's also more general purpose and makes for generally better code in the long run.
Although technically you could use JavaScript, I wouldn't suggest it; why go backwards in tech if you don't have to?
Related
I'm not sure of the best way to accomplish my goal. Looking for insight. I'm familiar with WebAPI services consumed through WPF and Silverlight but this is my first run at ASP and MVC.
I am building a site to verify contents of a shipment against an electronic manifest (EDI 856). I have a page that displays the shipping data and I need the users to scan each item barcode in the container. I would then like to pass that barcode to a service, verify the item belongs in that shipment and then update the page to show as much.
My plan was to have a single text box into which the user could scan/type the barcode and then submit that data to a WebAPI service which would verify the information and then probably use SignalR to send a message back to the page and update a grid with the item data.
If this is a decent way to go, I'm just not quite sure how to use ajax to call the WebAPI endpoint and provide the data I need.
I would advise against using SignalR in this situtation. What you need, judging from your description, is the most basic use case of submitting an ajax request and receiving a response.
You are not designing a system where you need the server to initiate communication with the browser or anything like that, where sockets (and SignalR as an abstraction over sockets with fallbacks to less suitable protocols) is a huge overkill.
Don't worry, your use case is rather simple.
It's a little out of scope to describe how to setup a WebApi project, how to configure routing, action names, etc. Simple google searches will surely provide ample quality tutorials on getting started.
I'll just try to explain what the general idea is, with some code samples, to get you thinking in the right direction.
You need to create an ApiController.
The simplest version of that Controller will probably look something like this:
public class ShipmentVerificationController : ApiController
{
//this is the response object you will be sending back to the client website
public class VerificationResult
{
public bool Valid;
}
public VerificationResult GetIsItemValid(string BarCode)
{
bool itemIsValid;
// Implement checks against the BarCode string here
itemIsValid = true;
return new VerificationResult { Valid = itemIsValid };
}
}
Note that the inner class represents the response you will be sending back. It should be properly filled out with additional info if needed and probably put into a separate .cs file in the "Models" folder or where ever you see fit.
I have declared it inside the controller for demonstration purposes only
Once you have a WebApi service deployed, it's really easy to send it data from your website and receive the feedback.
To simplify Ajax requests, jQuery is often used.
Once the user inputs the barcode into a textbox, you can hook up an event to check for return key being pressed (most barcode scanners send the return key command after they input the barcode data) and then write something along the lines of:
var barcode = $("#input-field").val();
$.getJSON( "<url_to_your_webapi_service>/api/ShipmentVerification/GetIsItemValid/" + barcode, function( data ) {
if (data.Valid) {
// great, highlight the item as valid
}
else {
//better indicate an error with the scanned item
}
});
Please note that for simplicity I have not included any error handling, url parameter encoding, and most importantly, zero authorization.
Authorization is very important if you deploy the web service to the open web but still do not want anyone to be able to call it.
You will have to research these topics yourself, but I hope I have presented you the core concepts and logic behind a simple service such as this, so you have a base to start with.
If you come up with specific problems and questions post a new question.
I actually found a more simple way to do this. I nixed the idea of using a WebAPI endpoint and just went with a normal controller. I used ajax to prevent the page from refreshing with the new view, since that view is actually just json data with my return values in it.
I am making an iPhone app where I am using .NET webservice.
Let's say below is the URL I have.
http://www.myweb.com/wser.asmx/listOfStudents?class=12
Here I was getting list of students with below fields in it.
Name
Roll Number
Class
Now client asked to make arabic version. So we update the query to below.
http://www.myweb.com/wser.asmx/listOfStudents?class=12&appLang=ar
^^^^^^^^^^^^
For testing we update webservice on another server & checked and all is working fine.
Now while uploading app on App store, I noticed if I update actual webservice current app won't work as appLang variable is missing in current app that is there on app store.
If I don't update webservice & apple go in testing, the app will crash as it will throw error of missing parameter appLang.
So what I was thinking is,
I will upload new webservice, BUT appLang will be arabic BY-DEFAULT.
Like if I execute url http://www.myweb.com/wser.asmx/listOfStudents?class=12 with updated webservice (appLang added in webservice but not in url), it will not throw error of parameter missing appLang?
Is there any way to make default parameter?
while using GET isn't that pretty in this case (POST could be more suitable), you could do this :
//by specifying a messageName, you can do overloading with webmethods
[WebMethod (MessageName = "listOfStudentsDefault")]
[ScriptMethod(UseHttpGet=true)]
public string listOfStudents(int class, string appLang)
{
// code here...
}
[WebMethod (MessageName = "listOfStudents")]
[ScriptMethod(UseHttpGet=true)]
public string listOfStudents(int class)
{
return listOfStudents(class, "ar");
}
I'm rewriting some old application, written in ASP.NET MVC. It used authentication by LDAP, but now it is necessary to rewrite it to OAuth2. I've decided to use DotNetOpenAuth library as it looked like best choice, but I'm stuck on auth response.
Currently, I have one controller class called AccountController, containing some methods, but most important are RedirectToIS and PostAuth (which is an redirect uri):
public ActionResult RedirectToIS()
{
DotNetOpenAuth.OAuth2.AuthorizationServerDescription asd = new DotNetOpenAuth.OAuth2.AuthorizationServerDescription();
String site = ConfigurationManager.AppSettings["oauth:site"];
asd.AuthorizationEndpoint = new Uri(site + "/oauth/authorize");
asd.TokenEndpoint = new Uri(site + "/oaut/token");
asd.ProtocolVersion = DotNetOpenAuth.OAuth2.ProtocolVersion.V20;
this.oaclient = new DotNetOpenAuth.OAuth2.WebServerClient(asd, ConfigurationManager.AppSettings["oauth:appid"], ConfigurationManager.AppSettings["oauth:secret"]);
this.oaclient.RequestUserAuthorization(null, new Uri("http://localhost/Account/PostAuth"));
return View();
}
The PostAuth method is what I am trying to make to work correctly. It is page, where the OAuth2 server redirect user after successful authorization with code and state GET parameters. Because I'm trying to utilize library and not (re)write it, I've stuck here - I don't know what to do now.
I tried, as I've seen in one example, use DotNetOpenAuth.OAuth2.IAuthorizationState st = this.oaclient.ProcessUserAuthorization(); in PostAuth, but it don't work. In example author had original WebServerClient instance, but I can't achieve it with Session nor using AccountControler data item.
So, finally, my question: How to transfer object oaclient from RedirectToIS method to PostAuth method (some kind of session?) or how to start using OAuth?
PS: I'm not new to C#, but I've never used ASP.NET.
I am kinda new in web development, looking for secured way to update SQL Database from the client side, or in other description updating the database without refreshing the webpage like (like facebook button).
I searched a lot and found that it can be done by using a web service and call it by javascript or using javascript direct or ajax, but which is the best and secured way and there is any other way to do it ?
thanks..
you can use ajax for updating database from client side.. Like if you click a button in web page, get the click event of that page through JavaScript or jQuery then through ajax you can perform database update. See the code below:
For catching event(like my button id is button1):
$('#<%=button1.ClientID%>').click(function{
$.ajax({
type: "POST",
url: "default.aspx/UpdateDatabase",
data: "{'textboxvalue':'" + $('<%=textbox1.ClientID%>').val() + "'}'
contentType: "application/json;charset=utf-8",
datatype: "json",
success: UpdateDone
});
});
In above code you have passed one value from a textbox1 to function UpdateDatabse in Default.aspx page(Please defined this function as [WebMethod]). then do your update in this function and return some string or bool value so that you can judge that update is done then value in success is name of function that will run if your function runs successfully so define that function in JavaScript or jQuery like
function UpdateDone(response)
{
if(response.d == 'done')
{ alert('Update is done'); }
else
{ alert('Sorry Update not done'); }
}
Above code will not do any postback you see that your value is updated in database. Please note that the function you make in C# page please mark it as WebMethod and it will be a static method, then only your JavaScript can find that function.
Hope this will resolve your problem.
The term ajax you use is correct but already a bit old. The new kids on the block are called SPA's where SPA stands for Single Page Application
It does what you want to achieve to the extreme: no more page refreshes. So it seems a good way to start
Here is The ASP.NET Single Page Application homepage
My advice is to research and invest time in one of the (many) javascript frameworks that will help you achieve this goal much faster. Hand coding javascript and make it work cross browser is too much work. The ASP.NET team choose upshot.js to solve your problem and it seems a fine choice.
Screenshot take from here
I found doing AJAX with JSON with ASP.NET MVC 3 to be easiest method of doing AJAX requests. Then you can have a specific action method that handles the request and makes the updates the database via Entity Framework(EF).
Essentially only passing the data that needs to be updated in the JSON. From there the MVC Action receives the JSON, and uses EF to lookup the DB record, apply/save changes. It can even respond with a success message which your AJAX can use to update some field that verifies the data was saved for the user(you could even do something where you have a "Saving..." message appear between the first ajax request and the response.)
This will allow you to send the request without refreshing your page. All your DB access code will be server side in the Action method.
This example shows how you might do a json request. You would modify this by adding additional code to the Create method to interact with entity framework(or your database tool of choice) to update a record based on the Person person parameter that was passed in(notice MVC did a really nice thing of converting the json data into a nice Person class!)
http://juristr.com/blog/2011/08/posting-json-data-to-aspnet-mvc-3-web/
If the data the user will enter in the webform is sensitive, you would need to encrypt it before sending the json request. I would personally just setup the website to use SSL. Anything you cook up on your own probably won't be as secure as SSL.
The code you add to the Create method might look like this:
//Find the person that they are attempting to edit
Person currentPerson = db.Persons.Find(person.PersonKey);
//update the database fields based on the submitted data(I would probably actually use AutoMapper for this
currentPerson.Name = person.Name;
currentPerson.DateOfBith = person.DateOfBirth;
//etc.
db.SaveChanges();
//compose a JSON response object indicating success, you would want to combine this with a try catch in the above to reply regarding failures as well
I've got a client that, during testing, is giving me conflicting information. I don't think they are lying but more confused. So, I would like to setup some simple auditing in my ASP.Net application. Specifically, right when any page is called, I want to immediately insert the Querystring and/or form POST data into a log table. Just the raw values.
Querystring is easy. But there doesn't seem to be a way to get the raw form POST'ed data without using BinaryRead, and if I do that, then I screw myself out of using the Request.Form collection later on.
Does anyone know a way around this?
EDIT: tvanfosson suggested Request.Params. I was looking for something that was easier to use (like Request.Querystring, only for POST), but I guess I could just as easily loop through all params and build a string of name=value&, etc).
You can create a custom HttpModule to capture all request made to your application so you don't need to touch every page and you can use it only during testing just not to slow down performance in production.
A sample implementation would be:
public class CustomModule : IHttpModule
{
public void Init(HttpApplication context)
{
context.EndRequest += new EventHandler(context_BeginRequest);
}
private void context_BeginRequest(object sender, EventArgs e)
{
HttpContext context = ((HttpApplication)sender).Context;
// you can use the context.Request here to send it to the database or a log file
}
}
You need to add the module to your web.config
<httpModules>
<add name="CustomModule" type="CustomModule"/>
</httpModules>
All of the form data should be in Request.Params. You'd need to do this on every page, though or maybe use an HttpModule.
[EDIT] If you want to get the form parameters separately use Request.Form, along with Request.QueryString
I would recommend implementing and HttpHandler or an HttpModule for this type of scenario. You can get to the POST Data from the Page_Load event but implementing this logging facility here is not as maintainable.