473,703 Members | 2,432 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

null, list and generics

Hi,

I am adding data to my list<T>. Som of my paramteres are "". When I try to
retreive them from the list I get a null exception error. How can I handle
null?

Thanks
Dec 25 '05 #1
1 1249
Are you adding to a List<string>? By "" do you mean an empty string?

If the answer to both questions is yes, then you can load the whole
List<string> with empty strings if you want and you'll be able to
retrieve every one of them. There is probably something else wrong in
your code.

As with all questions like this please provide a short code sample
demonstrating the problem, and indicate the point at which you get the
null reference exception.

--Bob

Vivek wrote:
Hi,

I am adding data to my list<T>. Som of my paramteres are "". When I try to
retreive them from the list I get a null exception error. How can I handle
null?

Thanks

Dec 26 '05 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

5
21766
by: Jimp | last post by:
Why can't I cast List<MyObject> to ICollection<IMyObject>. MyObject implements IMyObject, and of course, List implements ICollection. Thanks
4
2817
by: Cedric Rogers | last post by:
I wasn't sure if I could do this. I believe I am stretching the capability of what generics can do for me but here goes. I have a generic delegate defined as public delegate bool RuleDelegate<T>(T item); In my class my goal is to use a generic list collection to contain my generic delegates. This will allow me to pass this List to another library and call this list of functions. This could provide a new way to build rule base...
5
1969
by: Macca | last post by:
Hi, I have a number of objects i would like to store in a list like struture. They already have ID's associated with them so i would like to utilise these ids as accessors the list.. At the moment I have approx 10 objects with ids that are spread out, e.g 1, 12, 24, 56, 200,320....
8
2015
by: Nip | last post by:
Hi I want to access the Generic List of the following c++-class inside a vb.net app. Is this possible/how can I do that? Atm, I get the following error in the vb.net app: "Field 'GeoElems' is of an unsupported type." public ref class clsPhysik {
9
10401
by: =?Utf-8?B?UGV0ZXJX?= | last post by:
I have a TabControl on a Windows form in which I have various tab pages each with a DataGridView, the first column of which is a DataGridViewCheckBoxColumn and subsequent columns being DataGridViewtextBoxColumns. In each case the properties of the CheckBoxcolumn have been set to not allow nulls, so presumably only explicit true or false values should be possible. I run the application and set check boxes for DataGridView rows I am...
9
6989
by: Stephan Steiner | last post by:
Hi I seem to have a bit of trouble understanding one bit of how generics work: In C#, every class automatically derives from object, and inherits a bunch of properties (i.e. ToString()). Thus, (MyClass is object) should always evaluate as true. However, if I have a method with the following signature:
1
2108
by: tshad | last post by:
I have the following code: *************************************** public class Test { .... public static TestCollection MyNewCollection() { } }
7
6345
by: =?Utf-8?B?TXJOb2JvZHk=?= | last post by:
Say I have a class that has a generics List as follows: public List<MyClassmyClassList = new List<MyClass>(); and I want to create another class which tries to add an element of MyClass to that list, but it is not explicitly creating an instance of MyClass, but instead using the Activator to create an instance based on it's type name. How can I accomplish this in C# using reflection?
11
2543
by: Scott Stark | last post by:
Hello, The code below represents a singly-linked list that accepts any type of object. You can see I'm represting the Data variable a System.Object. How would I update this code to use generics instead of System.Object. I want the code in Form1_Load to remain exactly the same, but in the background I want to use generics. I'm trying to get a better understanding of how it works and I'm a little stuck.
0
8755
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
8667
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
9116
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
1
9013
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
8961
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
0
7860
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
0
5922
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
0
4428
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
3
2063
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.