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Value Cannot Be Null. Parameter Name Key Dictionary


This is wierd because sometimes works, sometimes not. Please refer to the DevExpress.com Website Terms of Use for more information. Show all comments Leave a Comment You must log in or register to leave comments ID: T309372 Created On: 11.08.2015 Modified On: 04.08.2016 Build: v2015 vol 1.6 / 24-Aug-2015 Operating System: Parameter name: key Jan 06, 2015 02:39 AM|azlamptb|LINK public ActionResult Edit(int id) { var row = db.CompanyModels.Find(id); return View(row); } this is that code and his comment is here

Based on the descriptions here, it seems that %HOME% resolves to an empty string. Am I thinking wrongly about this? –ANeves Sep 8 '11 at 15:42 add a comment| up vote 1 down vote Not using null is part of the contract according to the All-Star 110263 Points 18060 Posts MVP Re: Value cannot be null. Exception Details: System.ArgumentNullException: Value cannot be null.

C# Dictionary Nullable Key

Please review the stack trace for more information about the error and where it originated in the code. I have install the version 13.1 , 14.1.6 and 15.1.6 on my machine Gabriel 11.10.2015 Update to 15.1.7 and got the same error Alessandro (DevExpress Support) 11.11.2015 Hi,I have checked this But what about Dictionary? However, I found a workaround that, for some reason I dont know, worked.

Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account. (LogOut/Change) You are Stack Trace: [ArgumentNullException: Value cannot be null. Already have an account? Value Cannot Be Null. Parameter Name Key C# Parameter name: key Jan 06, 2015 09:51 AM|azlamptb|LINK i don't use here entity data model i create model and contextdb .it was working fine till before two days ..but now !!

Stack Trace: [ArgumentNullException: Value cannot be null. Exception Details: System.ArgumentNullException: Value cannot be null. Regards, Maria Ilieva Telerik Do you want to have your say when we set our development plans? Since that wasn't allowed, I ended up going with three consts (one for each label) and a string array for the SelectList.

In C++, you oftentimes have to pick a key that will not be used - the dictionary uses this key to point to deleted and/or empty entries. Value Cannot Be Null Parameter Name Key Sitecore Assigning only part of a string to a variable in bash What is this line of counties voting for the Democratic party in the 2016 elections? Parameter name: dictionary --------------------------- OK --------------------------- AArnott commented Mar 25, 2016 Yes, I've seen that as well. Make sure you are not supplying a null here.

C# Dictionary Null Value

Just a guess. –Mahmoud Al-Qudsi Feb 20 '12 at 21:30 Looking at the source it does set the key to default when you remove an entry.... That why .Net framework doesn't allow null value and throw an exception. C# Dictionary Nullable Key Not the answer you're looking for? C# Dictionary Null Check Browse other questions tagged c# asp.net gridview formview or ask your own question.

converter, and (3) a SelectList for a DropDownMenu (which I would have just passed the dictionary values to). this content The problem is all to do with Visual Studio doing something wrong and nothing to do with SqlDataSource or any other Web Forms controls. –Stony Oct 28 at 11:33 add a Parameter name: key] at System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument) at System.Collections.Generic.Dictionary.Insert(TKey key, TValue value, Boolean add) at System.Collections.Generic.Dictionary.Add(TKey key, TValue value) c# exception dictionary share|improve this question edited Jul 26 '11 at 22:02 mquander How can I claim compensation? C# Dictionary Empty String Key

  • You may share the project on the OneDrive, we will check it.
  • Either that or Dictionary has: if (key == null) and they never really thought about it.
  • What is the most someone can lose the popular vote by but still win the electoral college?

Missing } inserted. \int dx = x + C & How good should one be to participate in PS? please can anyone suggest solution to this problem or any direction for above error. Parameter name: key" error occurs when specify an EmptyImage Tags: .NET, ASP.NET Web Forms, ASPxGridView and Editors Suite 0 Gabriel 11.08.2015 Hi , When i put some value on a weblink Please review the stack trace for more information about the error and where it originated in the code.

Parameter name: key Jan 06, 2015 09:03 AM|azlamptb|LINK Sorry :( i didn't get . System.argumentnullexception: Value Cannot Be Null. Parameter Name: Key ovizii commented Jun 21, 2016 If I paste these 2 variables into my explorer I get: %HOMEPATH% => C:\Users\myuser %HOMEDRIVE% => C:\ duplicati member kenkendk commented Jun 21, 2016 Thanks, that Great, Thanks man..!!! –Smit Patel May 27 at 12:33 add a comment| up vote 4 down vote Try closing the Visual Studio and and access the same page.

My solution (applying it to your problem) would be to take your original code: foreach (XmlNode node in relatoriosStaticos.DocumentElement.ChildNodes) relatorios.Add(node.Attributes["Titulo"].InnerText, string.Concat(node.Attributes["Url"].InnerText, id)); And split it into two parts.

It should work. I testet it on Edge. You can't use a null reference as a dictionary key, either. System.collections.generic.dictionary`2.findentry(tkey Key) Reload to refresh your session.

ravensorb commented May 7, 2016 Oddly enough it doesn't break even when I set it to catch first chance exception AArnott commented May 8, 2016 Did you turn off the Just Also, the example implementation provided in MSDN returns true if both are null. Parameter name: key] System.Collections.Generic.Dictionary`2.FindEntry(TKey key) +10627293 System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& value) +12 Microsoft.VisualStudio.Web.PageInspector.Runtime.WebForms.SelectionMappingRenderTraceListener.GetLiteralTraceData(LiteralControl literal, TraceData& data) +97 Microsoft.VisualStudio.Web.PageInspector.Runtime.WebForms.SelectionMappingRenderTraceListener.GetTraceData(Object renderedObject) +421 Microsoft.VisualStudio.Web.PageInspector.Runtime.WebForms.SelectionMappingRenderTraceListener.EndRendering(TextWriter writer, Object renderedObject) +79 System.Web.UI.RenderTraceListenerList.EndRendering(TextWriter writer, Object renderedObject) +58 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, check over here MVC4 .NET Teacher | .NET Videos 5 minutes Reply Rion William...

Regards, Konstantin Dikov Telerik Do you want to have your say when we set our development plans? You shouldn't do that, of course, but that's different from saying you can't. –Kyralessa Feb 1 '10 at 5:41 add a comment| up vote -1 down vote I've just been reading share|improve this answer edited Feb 1 '10 at 4:54 answered Feb 1 '10 at 4:44 Fitzchak Yitzchaki 5,70273578 4 Null is a unique value. –Jonathan Allen Feb 1 '10 at Hope you can work with this info :) ❤️ 1 Head commented Apr 14, 2016 Same problem here.

Build me a brick wall! share|improve this answer edited Mar 6 '10 at 19:42 answered Mar 6 '10 at 17:16 John Muller 11 2 No, this is wrong. Hope it helps! How is the defined the class that contains the CustomerModels?

Teenage daughter refusing to go to school How to capture disk usage percentage of a partition as an integer? Parameter name: key Jan 06, 2015 03:58 AM|ignatandrei|LINK How it is defined in the db Class the CustomerModels? Stack Trace:

[ArgumentNullException: Key cannot be null. When you insert an key value pair into an hashtable, GetHashCode is called on the key. 

Well again, there is nothing in the C# language that would allow you to say that. share|improve this answer answered Feb 1 '10 at 15:08 ICR 8,99623266 add a comment| up vote -1 down vote Dictionary keys can't be null in .NET, regardless of the type of How can I save a file to a new location from inside Vim? Full Stack: [ArgumentNullException: Value cannot be null.

Parameter name: key Jan 06, 2015 02:25 PM|ignatandrei|LINK azlamptb private JbOContext db = new JbOContext(); please show class definition forJbOContext MVC4 .NET Teacher | .NET Videos 5 minutes Reply Starain chen... kenkendk added a commit that closed this issue Jun 21, 2016 kenkendk