Questions tagged [c#]
C# (pronounced "see sharp") is a high-level, statically typed, multi-paradigm programming language developed by Microsoft. C# code usually targets Microsoft's .NET ecosystem, which include .NET, .NET Framework, .NET MAUI, and Xamarin among others. Use this tag for questions about code written in C# or about C#'s formal specification.
1,619,947
questions
1437
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answers
1.1m
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Multiline string literal in C#
Is there an easy way to create a multiline string literal in C#?
Here's what I have now:
string query = "SELECT foo, bar"
+ " FROM table"
+ " WHERE id = 42";
I know PHP has
<<<BLOCK
...
- 21.9k
1414
votes
26
answers
1.2m
views
How and when to use ‘async’ and ‘await’
From my understanding one of the main things that async and await do is to make code easy to write and read - but is using them equal to spawning background threads to perform long duration logic?
I'...
- 33.2k
1391
votes
16
answers
1.3m
views
How to call asynchronous method from synchronous method in C#?
I have a public async Task Foo() method that I want to call from a synchronous method. So far all I have seen from MSDN documentation is calling async methods via async methods, but my whole program ...
- 101k
1373
votes
21
answers
774k
views
Difference Between Select and SelectMany
I've been searching the difference between Select and SelectMany but I haven't been able to find a suitable answer. I need to learn the difference when using LINQ To SQL but all I've found are ...
- 81.1k
1353
votes
3
answers
1.5m
views
How do I encode and decode a base64 string?
How do I return a base64 encoded string given a string?
How do I decode a base64 encoded string into a string?
- 53.2k
1345
votes
4
answers
108k
views
\d less efficient than [0-9]
I made a comment yesterday on an answer where someone had used [0123456789] in a regex rather than [0-9] or \d. I said it was probably more efficient to use a range or digit specifier than a character ...
- 54.6k
1335
votes
11
answers
680k
views
Call one constructor from another
I have two constructors which feed values to readonly fields.
public class Sample
{
public Sample(string theIntAsString)
{
int i = int.Parse(theIntAsString);
_intField = i;
...
- 16k
1321
votes
39
answers
1.2m
views
How can I generate random alphanumeric strings?
How can I generate a random 8 character alphanumeric string in C#?
- 67.3k
1321
votes
37
answers
1.6m
views
How do you get the index of the current iteration of a foreach loop?
Is there some rare language construct I haven't encountered (like the few I've learned recently, some on Stack Overflow) in C# to get a value representing the current iteration of a foreach loop?
For ...
- 41.6k
1316
votes
29
answers
1.3m
views
Convert a string to an enum in C#
What's the best way to convert a string to an enumeration value in C#?
I have an HTML select tag containing the values of an enumeration. When the page is posted, I want to pick up the value (which ...
- 28.2k
1315
votes
61
answers
831k
views
Could not find a part of the path ... bin\roslyn\csc.exe
I am trying to run an ASP.NET MVC (model-view-controller) project retrieved from TFS (Team Foundation Server) source control. I have added all assembly references and I am able to build and compile ...
- 14k
1309
votes
5
answers
443k
views
How to mark a method as obsolete or deprecated?
How do I mark a method as obsolete or deprecated using C#?
1301
votes
9
answers
365k
views
How do I call a generic method using a Type variable?
What's the best way to call a generic method when the type parameter isn't known at compile time, but instead is obtained dynamically at runtime?
Consider the following sample code - inside the ...
- 44.1k
1292
votes
10
answers
1.9m
views
Group by in LINQ
Let's suppose if we have a class like:
class Person {
internal int PersonID;
internal string car;
}
I have a list of this class: List<Person> persons;
And this list can have ...
- 14.1k
1252
votes
15
answers
2.2m
views
How do I turn a C# object into a JSON string in .NET?
I have classes like these:
class MyDate
{
int year, month, day;
}
class Lad
{
string firstName;
string lastName;
MyDate dateOfBirth;
}
And I would like to turn a Lad object into a ...
- 14.2k