Hello,
maybe this is an easy one:
Is there any way to check, if a string value can be
converted into another type (e.g. DateTime, Integer)
without using exceptions (try/catch)?
Thanks in advance,
Daniel 2 2466
in c#, not really - although some types do have a .TryParse() function.
If you wish to, you can reference Microsoft.Visua lBasic, and use the
IsNumeric, IsDate, etc functions defined there. However, some of those have
lots of code in them, and my not actually be more performant than try/catch.
Lastly, you could use a compiled regular expression to match the data, which
(After the first time) will probably be faster than either other method.
-Philip
"Daniel" <an*******@disc ussions.microso ft.com> wrote in message
news:08******** *************** *****@phx.gbl.. . Hello,
maybe this is an easy one: Is there any way to check, if a string value can be converted into another type (e.g. DateTime, Integer) without using exceptions (try/catch)?
Thanks in advance, Daniel
Philip Rieck <st***@mckraken .com> wrote: in c#, not really - although some types do have a .TryParse() function.
If you wish to, you can reference Microsoft.Visua lBasic, and use the IsNumeric, IsDate, etc functions defined there. However, some of those have lots of code in them, and my not actually be more performant than try/catch.
Lastly, you could use a compiled regular expression to match the data, which (After the first time) will probably be faster than either other method.
If you're interested in performance and will be getting a lot of "bad
data", you should also consider a first-pass method which might (say)
look at each character in the string to make sure it's appropriate.
I've found that this kind of thing can be far faster at filtering out a
lot of obviously bad candidates and then using an "industrial
strength" technique on the rest than just going straight to the heavy
stuff.
--
Jon Skeet - <sk***@pobox.co m> http://www.pobox.com/~skeet
If replying to the group, please do not mail me too This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: John Roth |
last post by:
PEP 263 is marked finished in the PEP index, however
I haven't seen the specified Phase 2 in the list of changes
for 2.4 which is when I expected it.
Did phase 2 get cancelled, or is it just not in the
changes document?
John Roth
|
by: chris |
last post by:
Hello,
I have been reading the c++ standard recently, in particular the part
about input iterators. I note that given an input iterator a for type T,
then *a only has to be "convertable to T", not actually of type T.
Firstly, I can't seem to find an exact definition of "convertable to T".
While I assume it is the obvious definition (an implicit conversion), I
can't find an exact definition. Is there one?
|
by: Ronald Fischer |
last post by:
Assume the following JavaScript function:
function bracketize(s)
{
return '';
}
This function which doesn't assume anything about its argument
except that it must be convertible to a string.
|
by: Davy |
last post by:
Hi all,
I found
char x={"my"};
can be compiled.
But
char x;
x={"my"};
can not be compiled.
|
by: Daniel |
last post by:
Hello,
This is maybe a simple one:
Is there any way to check, if a string can be converted to
another type (like DateTime or Integer) without using
try/catch? In VB, i can use IsDate or IsNumeric to do
this, but how can i do it in C#?
Thanks in advance,
Daniel
| |
by: Gaijinco |
last post by:
I made this function which given two strings c1 and c2 test if with the
letters of both you can exactly form the string c3, so for exaple c1 =
"evol" c2= "ution" and c3 = "evolution" will yield true.
The function looks like this:
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
|
by: tommaso.gastaldi |
last post by:
Hi,
does anybody know a speedy analog of IsNumeric() to check for
strings/chars. I would like to check if an Object can be treated as a
string before using a Cstr(), clearly avoiding the time and resource
consuming Try... Catch, which in iterative processing is totally
unacceptable.
-tom
|
by: tony |
last post by:
Hello!
I have below a for loop and a switch in the for loop.
I have also a enum called colBlowStep with some values.
I have also an array called m_columnBlowStep with some strings.
All items in the array m_columnBlowStep is string because I have used
ToString on each enum item as you can see.
I want to use enum in the case statment in the switch.
I know I can use string but I rather want to use enum.
|
by: rn5a |
last post by:
A sub-routine retrieves the value in a TextBox (which ought to be an
integer) which in turn resides in a DataGrid (actually the column is a
BoundColumn which changes to a TextBox when the DataGrid is in the
editable mode). This is the code:
-----------------------------------
Dim strQty As String
Dim iQty As Integer
strQty = CType(ea.Item.Cells(5).Controls(0), TextBox).Text
|
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...
|
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,...
| |
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: 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,...
|
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: 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();...
|
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...
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
| |
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...
| | |