in my project i need to upload files so i decided to use the uploader provided by asp.net ajax controls AsyncFileUPloader control.
there are four blocks. every block contains two such uploaders
so i decided to utilize the power of asp.net web user controls.
i wrapped the required form fields in my user control called DesignUploader.ascx
now i have to put the four instances of this control on my aspx page
please refer the snap below
my problem starts here i have to insert the fileurl to the database and each of the block generates unique id and id value changes after uploading the file to the server. i noticed that viewstate does not work for me in case of asyncfileuploader it clears the viewstate because it does the secret postback to the server behind the scenes. now only option left for me is to use session but when user uploads the files in two blocks one after another then filepath from second/third consecutive blocks overwrite my session. i don't know how many blocks user can use to upload the designs he may use 1 only or he may use all four.
There would be a final submit button in the bottom of the page on click of which i have to insert data to database.
so when i tried to save the data to database the session stores the value of the recently uploaded file path for all the records my problem lies here
i don't know if i was able to describe my problem in correct manner or not please excuse me if it is not clear and post comment if required.
Note: I can not change the UI because client insists for this only :(
any quick work around would be appreciated much
Thanks
Devjosh
I believe you saving file path to session in a wrong way and it's impossible to recognize where is an error without code.
All the way, in my opinion better don't persist file path in session but use client side for that purpose instead. You can add two hidden fields to DesignUploader.ascx control and set their values in UploadedComplete event handler.
public partial class DesignUploader : System.Web.UI.UserControl
{
private static readonly string AppDataPath = HttpContext.Current.Server.MapPath("~/App_Data/");
public string FirstFilePath
{
get
{
return Server.UrlDecode( FirstFilePathHiddenField.Value);
}
}
public string SecondFilePath
{
get
{
return Server.UrlDecode(SecondFilePathHiddenField.Value);
}
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
FirstFileUpload.UploadedComplete += FirstFileUpload_UploadedComplete;
SecondileUpload.UploadedComplete += SecondileUpload_UploadedComplete;
}
void FirstFileUpload_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
{
var fullPath = Path.Combine(AppDataPath, Path.GetFileName(e.FileName));
FirstFileUpload.SaveAs(fullPath);
SaveFilePathToHiddenField(FirstFilePathHiddenField.ClientID, fullPath);
}
void SecondileUpload_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
{
var fullPath = Path.Combine(AppDataPath, Path.GetFileName(e.FileName));
SecondileUpload.SaveAs(fullPath);
SaveFilePathToHiddenField(SecondFilePathHiddenField.ClientID, fullPath);
}
private void SaveFilePathToHiddenField(string fieldId, string pathValue)
{
var script = string.Format("top.$get('{0}').value = '{1}';", fieldId, Server.UrlEncode(pathValue));
ScriptManager.RegisterStartupScript(this, this.GetType(), "setPath", script, true);
}
}
Related
My requirement is like when someone opens url of any files from my asp.net mvc web site I want to track details of that user. Please note I have already added some query string, so only when opens url with that query string I want to track.
For another Action Methods I have already added query string to track via action filter. In action filter I am checking for that query string and if query string is not null and has some value then track that click.
But this logic will not work for direct URLs of files. For more details please see below example URLs.
http://wwww.example.com/Home/MyAction?trackerId=123 - TRACKING
http://wwww.example.com/Upload/Files/abc.jpg?trackerId=123 - NOT TRACKING
So any suggestions?
You could access all requests via the following in Global.asax file.
protected void Application_BeginRequest(Object sender, EventArgs e)
{
try {
var app = sender as HttpApplication;
var trackerId = app.Request.QueryString["trackerId"]
...do stuff...
}
catch { }
}
In my application, I have a form that users fill out, then gets approved by a manager. I have various types of forms that all use the same process, so the approval buttons are all done via a user control (which includes the functionality to update the data in the database and call the postback).
However, once I click on the "Approve" button (which is in the user control), the form information doesn't update (it still says "unapproved"). A postback is definitely happening, but not sure why the page isn't updating properly.
I can confirm that the change are being made - when I manually reload the page, it gets updated - but not on the post back.
What am I missing here?
My page:
protected void Page_Load(object sender, EventArgs e)
{
int ID;
// ensure that there's an ID set in the query string
if (Int32.TryParse(Request.QueryString["ID"], out ID))
PopulatePage(ID);
else
Response.Redirect("~/Default.aspx");
}
}
protected void PopulatePage(int ID)
{
using (WOLinqClassesDataContext db = new WOLinqClassesDataContext())
{
lblStatus.Text = wo.Workorder.status;
....
}
}
I think that the Page_Load happens before the code in the submit button. To check this just use a couple of breakpoints. So the page loads the old data since the new data are not saved yet.
You should call a method to load the data inside the OnClick method of the Approve button.
After you've submitted the changes to the database, try running db.Refresh(RefreshMode.OverwriteCurrentValues) to force the changes to be reloaded into the data context.
How can i access a control or function from asp page (code behind) in Global.asax?
i use below code for background task, this code check for new emails every 60 seconds and i want to update a label that show new email's count in default.aspx
void Application_Start(object sender, EventArgs e)
{
AddTask("CheckEmails", 10);
}
private void AddTask(string name, int seconds)
{
OnCacheRemove = new CacheItemRemovedCallback(CacheItemRemoved);
HttpRuntime.Cache.Insert(name, seconds, null, DateTime.Now.AddSeconds(seconds), Cache.NoSlidingExpiration,
CacheItemPriority.NotRemovable, OnCacheRemove);
}//addTask
public void CacheItemRemoved(string k, object v, CacheItemRemovedReason r)
{
//Check New Emails and update label from .aspx
AddTask(k, Convert.ToInt32(v));
}//CacheItemRemoved
Create a seperate class for common function, put it in app_code folder, then access this function from Default.aspx and global.asax....
why do you to do this. Kindly provide some more information.
Though you can create an object of Default page and call it's function.
But still if that is not related to the page then only it is good to use.
Edit 1
You don't need it to call from application start.
You can call this function on your page load(which is called after login page).
You can check for the existing value in the cache with the same key.
If it exist then don't modify the cache
Else Put your values in the cache.
I have a site with multiple pages, not necessarily heirarchical. I want to query the user's identity (using AD...) whenever the user first enters the site, and create session state variables for the convenience of other pages as needed. A user could possibly enter the site without going through the default.aspx page, so I thought I'd put the code in the Master Page's code-behind.
On the assumption this is a good idea, versus some sort of static class that maintains this information, I started setting it up, but found the Master Page code-behind doesn't always seem to get fired when I enter the site. Is this a debugging phenomenon, or am I right, and the Master Page is the wrong place to put this code...?
I would recommend using the Global.asax class. You'll need to add it to your web app if it's not already there. Once you have it, you can then use the various events (session start and end, app start and end and error) to implement business logic particular to what you need exactly.
I tend to monkey around with the logged in user in the Application_PreRequestHandlerExecute event of the global.asax. This will allow you to look at the User Principle (eg - User.Identity.Name) to see who is logged in (or if they're not logged in) and do what you need to (such as set Session information for the user, etc.).
Here's a tidbit of code I've got on one .NET web app that uses the Global.asax for storing user data in the Session.
protected void Application_PreRequestHandlerExecute(Object sender, EventArgs e) {
if (Context.Handler is IRequiresSessionState || Context.Handler is IReadOnlySessionState) {
SetUserItem();
}
}
private void SetUserItem() {
if (Session["UserItem"] == null)
Server.Execute("~/SetSessionUserObj.aspx", true);
}
... and then the SetSessionUserObj.aspx.cs
protected void Page_Load(object sender, EventArgs e) {
string ID = User.Identity.Name;
MyUser myUser = new MyUser();
UserItem userItem = myUser.GetUserItemByID(ID);
if (userItem != null) {
Session["UserItem"] = userItem;
}
}
This is just one manner that you can go about accessing a user's identity in the global.asax. You don't necessarily have to go about doing a Server.Execute to set user data (I just did it for other reasons that fall outside the scope of this question).
Good luck.
I have a user control that is being integrated to the page on run time, now here on the page i have a few HTML control whose values need to save too, as i have written the save method logic to the user control because it has many content their to save in DB, but what i am missing is how to save the page content to the DB using the same Save Method?
If my understanding is correct, you just need to pass the values to the UC, just declare public properties in your UC and assign the values at runtime:
Check the following example:
Public properties approach
In the UC code behind
public string Street
{
get
{
return this.ViewState["c"] as string;
}
set
{
this.ViewState["c"] = value;
}
}
public void Save()
{
...
// your logic to save the UC data
// save the custom properties too, this.Street
{
In the ASPX code behind
this.myAddressTemplateControl.Street = myOtherControl.Text;
Accessing directly the page object
In the UC code behind
this.Page.FindControl("myPageControlID");