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by: Sakoulakis |
last post by:
Hi,
I was just reading about nullable types and I like that feature very much.
What dissapointed me is that nullable string is not supported.
Imagine a field (of type sting) in a database which is not assigned.
I agree with nullable only for value types but in my eyes string is kind of
a mix between a value type and a reference type.
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by: ESPNSTI |
last post by:
Hi,
Please don't shoot me if the answer is simple, I'm new to .Net and C# :)
..
I'm attempting to convert a nullable type to it's "non-nullable" type in a
generic way (without knowing what specific type the nullable type is.)
The reason I'm trying this is because when I attempt to pass a nullable type
value to a SqlCommand parameter and then attempt to execute it I the
following error:
"No mapping exists from object type...
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by: Yuriy Solodkyy |
last post by:
Hi
VS 2005 beta 2 successfully compiles the following:
using System;
using System.Collections.Generic;
using System.Text;
namespace ConsoleApplication1 {
class Program {
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by: WHY |
last post by:
Since there's no way to create a c# method with optional, or nullable
parameters.
And since you can't write an overloaded web method.
Is it possible to edit the WSDL in conjunction with a c# method to make the
parameter optional, or have a default value at the client consumer?
--
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by: Mark Rae |
last post by:
Hi,
In v1.1 I used to simulate nullable datatypes with structs. e.g.
public struct NullableString
{
private readonly String pstrValue;
private readonly bool blnHasValue;
public NullableString(String strValue)
{
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by: shawnk |
last post by:
Given several nullable boolean flags;
bool? l_flg_01 = true;
bool? l_flg_02 = false;
bool? l_flg_03 = true;
bool? l_result_flg = null;
I would have liked one of these syntax formats to work;
// if ( l_flg_01 && l_flg_02 && l_flg_03 ) // Line A
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by: Joe Bloggs |
last post by:
Hi,
Can someone please kindly show me how to determine if a type (read value
type) is Nullable.
MSDN has this KB:
How to: Identify a Nullable Type (C# Programming Guide)
http://msdn2.microsoft.com/en-us/library/ms366789.aspx
however, using their code snippet, I couldn't get it to work:
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by: Sam Kong |
last post by:
Hello,
I want to define a generic class which should accept only nullable
types or reference types.
What's the best way to costrain it?
---------
class MyClass<T>{
...
|
by: tshad |
last post by:
Can you handle nullable string vb.net 2.0?
You can with Integer but I get an error when I try to do a
Dim s as Nullable (Of String)
Now strings are a nullable type but it can't handle:
fn.FormName = dbReader("FormName")
|
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...
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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,...
|
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
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...
|
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,...
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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...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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