This question already has answers here:
How do I interpolate strings?
(15 answers)
Closed 5 years ago.
HttpResponseMessage response = await client.PutAsJsonAsync($"api/products/{product.Id}", product);
In the above code I've been using the $ keyword but I don't the significance of this keyword. I searched in google but coiuldn't find proper answer. I think this might be a duplicate but couldn't find relative answer even in stackexchange.
Thanks in advance
It's an interpolated string - the new feature of C# 6, which is basically just a syntax sugar for String.Format (compiler converts interpolated strings into the String.Format calls). Your string is equivalent to
String.Format("api/products/{0}", product.Id)
$"api/products/{product.Id}"
is the short version for
string.Format("api/products/{0}", product.Id);
You could have a look in the MSDN
Related
This question already has answers here:
Using regular expressions to validate a numeric range
(11 answers)
Closed 3 years ago.
I want to build a regex to search number in a string (using c#) with range from 0000-4095. I use this string pattern:
string regex_pattern = (0?[0-3][0-9][0-9][0-9]|{4}{0}[0-9]{0}|{4}{0}{9}[0-5]);
But i can not get success.
Can you please show me some hints?
Thanks
You could use
^([0123][0-9][0-9][0-9]|40[0-8][0-9]|409[0-5])$
Regex Demo
Sample
sorry for the multiples groups:
([0-4]0(([0-9][0-5])|([0-8][0-9])))|([0-3][0-9]{3})
Sample
This question already has answers here:
Regular expression for floating point numbers
(20 answers)
Closed 3 years ago.
I want to replace the following pattern in an html file
<BR>1696.54</TD>
to
<TD>1696.54</TD>
I am using the RegEx.Replace code
result = Regex.Replace(html, "<BR>\d</TD>", "<TD>$1</TD>")
but I am doing something incorrectly as nothing happens.
Any help would be appreciated..
You need capture a group using parentheses and change :
`\d`
to
`\d*\.\d*`
try this :
result = Regex.Replace(html, "<BR>(\d*\.\d*)</TD>", "<TD>$1</TD>")
This question already has answers here:
Regex escape with \ or \\?
(5 answers)
Closed 4 years ago.
I'm getting the not enough )'s error, but as best I can tell I've got all the )'s in.
line getting error:
string pathFriendlyDevId = Regex.Match(device, "VEN.*(?=\\)").ToString().Replace("&", "_");
device string getting parsed:
string device = "PCI\\VEN_144D&DEV_A804&SUBSYS_A801144D&REV_00\\4&10B60712&0&00EA";
the goal here is to get everything from VEN to REV_00.
Am I missing something obvious here?
As was pointed out above, using a verbatim string such as #"VEN.*(?=\\)" did the trick
This question already has answers here:
Floating curly braces in C#
(6 answers)
Closed 6 years ago.
I came across the following code in c#:
semaphore.Wait();
{
HandleRateLimit(region);
}
semaphore.Release();
(source)
I was wondering, do the brackets around the HandleRateLimit(...) call have any special meaning? If not, why would someone write code that way?
Brackets have nothing to do with semaphores. The idea was, probably, to make it more readable and to point out critical section.
This question already has answers here:
String output: format or concat in C#?
(32 answers)
Why use String.Format? [duplicate]
(7 answers)
Closed 9 years ago.
Why shouldn't we simply use
string s=product.Name+" has been saved";
instead of:
string s=string.Format("{0} has been saved", product.Name);
One naive reason would be that it helps to prevent exactly the string formatting issue that you've presented in your original (unedited) question i.e.
string s=product.Name+"has been saved";
requires an extra space. The format method aids readability.
You could do that, no one say that you cannot. But mainly for readability, the second approach is prefered. It's even more obvious as soon as you concat more than 2 strings, it gets really messy, hard to read and mantain.
If you have many strings that you want to add, each + operation create new string.
For adding many strings you can use StringBuilder Class or String.Format