This is the code to my Master Page cs file. For some reason when I run my default page, I get an error that says "object reference not set to an instance of an object."
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace Theming.MasterPages
{
public partial class Main : System.Web.UI.MasterPage
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
string selectedTheme = Page.Theme;
HttpCookie preferredTheme = Request.Cookies.Get("PreferredTheme");
if (preferredTheme != null)
{
selectedTheme = preferredTheme.Value;
}
if (!string.IsNullOrEmpty(selectedTheme))
{
ListItem item = ThemeList.Items.FindByValue(selectedTheme);
if (item != null)
{
item.Selected = true;
}
}
}
switch (Page.Theme.ToLower())
{
case "darkgrey":
Menu1.Visible = false;
TreeView1.Visible = true;
break;
default:
Menu1.Visible = true;
TreeView1.Visible = false;
break;
}
}
protected void ThemeList_SelectedIndexChanged(object sender, EventArgs e)
{
HttpCookie preferredTheme = new HttpCookie("PreferredTheme");
preferredTheme.Expires = DateTime.Now.AddMonths(3);
preferredTheme.Value = ThemeList.SelectedValue;
Response.Cookies.Add(preferredTheme);
Response.Redirect(Request.Url.ToString());
}
}
}
The error appears to be at the switch statement but I can't figure out why. I've read on other posts that the value is assigning to the variable as null but I don't know why; I've got dark grey as an app theme. If anyone could please help me it would be very much appreciated.
I don't see Menu1 or TreeView1 defined anywhere in your markup. If those are in a content page, you can't access those in the MasterPage code-behind (there may be a way, but you can't directly access them the way you're trying to).
Related
Can someone please help me how can i use special characters in ASP.Net identity?
The problem is that my users cannot register with special characters: č,ć,š,ž,đ.
When you try to enter this characters in registration, i get following error:
User name Krešo is invalid, can only contain letters or digits.
Where and how can i change this.
Here is the code:
using Microsoft.AspNet.Identity;
using Microsoft.Owin.Security;
using Microsoft.AspNet.Identity.EntityFramework;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Pages_Account_Register : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnPrijava_Click(object sender, EventArgs e)
{
UserStore<IdentityUser> userStore = new UserStore<IdentityUser>();
userStore.Context.Database.Connection.ConnectionString =
System.Configuration.ConfigurationManager.ConnectionStrings["SeminariConnectionString3"].ConnectionString;
UserManager<IdentityUser> manager = new UserManager<IdentityUser>(userStore);
IdentityUser user = new IdentityUser();
user.UserName = txtKorisnickoIme.Text;
if(txtLozinka.Text == txtPotvrdaLozinke.Text)
{
try
{
IdentityResult result = manager.Create(user, txtLozinka.Text);
if(result.Succeeded)
{
var authenticationManager = HttpContext.Current.GetOwinContext().Authentication;
var userIdentity = manager.CreateIdentity(user, DefaultAuthenticationTypes.ApplicationCookie);
authenticationManager.SignIn(new AuthenticationProperties(), userIdentity);
Response.Redirect("Pocetna.aspx");
}
else
{
litStatus.Text = result.Errors.FirstOrDefault();
}
}
catch (Exception ex)
{
litStatus.Text = ex.ToString();
}
}
else
{
litStatus.Text = "Lozinke moraju biti identične.";
}
}
}
You should be able to change this behaviour as follows:
var manager = new UserManager<IdentityUser>(userStore); // existing code
var validator = manager.UserValidator as UserValidator<ApplicationUser>;
if (validator != null) validator.AllowOnlyAlphanumericUserNames = false;
Should validator turn out to be null, then debug a little to find the actual type used at runtime.
drop-down list in C#.net not showing the items it supposed to show!
i hv a drop-down list that suppose to show image names from a folder, but it is not doing that!
i dont have errors when launching the .aspx file!
buuuuuut when i get output there is only empty dropdown list!
this the ManageProducts.aspx codes are:
Name:
Type:
" SelectCommand="SELECT * FROM [ProductTypes] ORDER BY [Name]">
Price:
Image:
Description:
and this the behind codes:
using System;
using System.Collections;
using System.IO;
public partial class PagesNew_ManagementPages_ManageProducts : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack) //this baby makes the data not come every time the pg is refreshed ,
//postback=refresh page
GetImages();
}
private void GetImages()
{
try
{
//get all filepaths
string[] images = Directory.GetFiles(Server.MapPath("~/Img/Products/"));
//get all filenames and put them in a stupid array....yeah DSA days
ArrayList imageList = new ArrayList();
foreach (string image in images)
{
string imageName = image.Substring(image.LastIndexOf(#"\", StringComparison.Ordinal) + 1);
imageList.Add(imageName);
// see the Array in dd viwe datasource and refresh
ddImage.AppendDataBoundItems = true;
ddImage.DataBind();
}
}
catch (Exception e)
{
lblResult.Text = e.ToString();
}
}
protected void ddImage_SelectedIndexChanged(object sender, EventArgs e)
{
}
}
You want to bind your datalist outside of the for loop.
ArrayList imageList = new ArrayList();
foreach (string image in images)
{
string imageName = image.Substring(image.LastIndexOf(#"\", StringComparison.Ordinal) + 1);
imageList.Add(imageName);
}
ddImage.DataSource = imageList;
ddImage.AppendDataBoundItems = true;
ddImage.DataBind();
Here are is my column class and i've added this code to my radgrid
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Telerik.Web.UI;
namespace EFDemo.Views.Controls
{
public class HpGridButtonColumn : GridButtonColumn{
public string LinkedTab;
public override void InitializeCell(System.Web.UI.WebControls.TableCell cell, int columnIndex, Telerik.Web.UI.GridItem inItem)
{
//if (inItem is GridHeaderItem)
//{
// cell.Text = this.DataField;
//}
//if (inItem is GridDataItem)
//{
// string ID = (string) inItem.OwnerTableView.DataKeyValues[inItem.ItemIndex]["CustomerID"];
// cell.Controls.Add(new LiteralControl(ID));
//}
base.InitializeCell(cell, columnIndex, inItem);
}
public override GridColumn Clone()
{
HpGridButtonColumn col = new HpGridButtonColumn();
//you should override CopyBaseProperties if you have some column specific properties
col.CopyBaseProperties(this);
return col;
}
protected override void CopyBaseProperties(GridColumn FromColumn)
{
base.CopyBaseProperties(FromColumn);
((HpGridButtonColumn)FromColumn).LinkedTab = LinkedTab;
}
}
}
protected void HPRadgrid_ColumnCreating(object sender, GridColumnCreatingEventArgs e)
{
if ((e.ColumnType == typeof(HpGridButtonColumn).Name))
{
e.Column = new HpGridButtonColumn();
}
}
Problem is the property [linkedTab] is not being restored on postback. It is null.
Also, the clone method on the column is not being called. I assume this is why the property is not being restored.
I have a UserControl that has some javascript I'd like to inject into a known ContentPlaceHolder.
I was hoping to do something like the following except when I append to add the control to found control I get an exception which says I cannot modify the control collection in the Init, Load or PreRender events:
"UserControl.ascx"
<%# Control Language="C#" %>
<asp:Checkbox runat="server" id="checkBox"/>
<app:JavascriptInjector runat="server" InjectInto="ScriptPlaceHolder">
$(function(){ $('#<%= checkBox.ClientID %>').click(function() { ... });
</script></app:JavascriptInjector>
"JavascriptInjector.cs"
using System;
using System.Diagnostics;
using System.Linq;
using System.Web.UI;
using System.Web.UI.WebControls;
public class JavascriptInjector : PlaceHolder
{
public string InjectInto
{
get { return this.ViewState["InjectInto"] as string; }
set { this.ViewState["InjectInto"] = value; }
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
this.PreRender += this.__PreRender;
}
private void __PreRender(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(this.InjectInto))
{
goto performRegularlly;
}
var injectInto = this.FindControlRecursively(this.Page);
if (injectInto == null)
{
goto performRegularlly;
}
injectInto.Controls.Add(this);
return;
performRegularlly:
Debug.WriteLine("performing regularlly");
}
private Control FindControlRecursively(Control current)
{
var found = current.FindControl(this.InjectInto);
if (found != null)
{
return found;
}
foreach (var child in current.Controls.Cast<Control>())
{
return this.FindControlRecursively(child);
}
return null;
}
}
I figured it out. The following JavascriptInjector class will work, although I don't know what the implications are of calling the render method in the PreRender. Also think I may need to do something to figure out which type of HtmlTextWriter that the base application is using.
"JavaScriptInjector.cs"
using System;
using System.IO;
using System.Linq;
using System.Web.UI;
using System.Web.UI.WebControls;
public class JavascriptInjector : PlaceHolder
{
private bool performRegularlly;
public string InjectInto
{
get { return this.ViewState["InjectInto"] as string; }
set { this.ViewState["InjectInto"] = value; }
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
this.PreRender += this.__PreRender;
}
protected override void Render(HtmlTextWriter writer)
{
if (this.performRegularlly)
{
base.Render(writer);
}
}
private void __PreRender(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(this.InjectInto))
{
goto performRegularlly;
}
var injectInto = this.FindControlRecursively(this.Page);
if (injectInto == null)
{
goto performRegularlly;
}
performRegularlly = false;
using (var stringWriter = new StringWriter())
using (var writer = new HtmlTextWriter(stringWriter))
{
base.Render(writer);
writer.Flush();
injectInto.Controls.Add(new LiteralControl(stringWriter.GetStringBuilder().ToString()));
}
this.Controls.Clear();
return;
performRegularlly: this.performRegularlly = true;
}
private Control FindControlRecursively(Control current)
{
var found = current.FindControl(this.InjectInto);
if (found != null)
{
return found;
}
foreach (var child in current.Controls.Cast<Control>())
{
return this.FindControlRecursively(child);
}
return null;
}
}
I have SharePoint 2007 on Windows Server 2003 SP1 (in VM).
I am running the web application here: http://vspug.com/nicksevens/2007/08/31/create-custom-field-types-for-sharepoint/
Part of it is below:
using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI.WebControls;
using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
namespace CustomControl
{
public class customfieldcontrol : BaseFieldControl
{
protected TextBox txtFirstName;
protected TextBox txtLastName;
protected override string DefaultTemplateName
{
get { return "CustomFieldRendering"; }
}
public override object Value
{
get
{
EnsureChildControls();
return txtFirstName.Text + "%" + txtLastName.Text;
}
set
{
try
{
EnsureChildControls();
txtFirstName.Text = value.ToString().Split('%')[0];
txtLastName.Text = value.ToString().Split('%')[1];
}
catch { }
}
}
public override void Focus()
{
EnsureChildControls();
txtFirstName.Focus();
}
protected override void CreateChildControls()
{
if (Field == null) return;
base.CreateChildControls();
//Don't render the textbox if we are just displaying the field
if (ControlMode == Microsoft.SharePoint.WebControls.SPControlMode.Display) return;
txtFirstName = (TextBox)TemplateContainer.FindControl("txtFirstName");
txtLastName = (TextBox)TemplateContainer.FindControl("txtLastName");
if (txtFirstName == null) throw new NullReferenceException("txtFirstName is null");
if (txtLastName == null) throw new NullReferenceException("txtLastName is null");
if (ControlMode == Microsoft.SharePoint.WebControls.SPControlMode.New)
{
txtFirstName.Text = "";
txtLastName.Text = "";
}
}
}
}
This line:
txtFirstName = (TextBox)TemplateContainer.FindControl("txtFirstName");
always returns null.
I removed base.CreateChildControls() but it still returns null.
Any assistance would be greatly appreciated.
Place your control's .ascx file right under CONTROLTEMPLATES folder and try.