This tag can represent question about Expression Body [=>] operator for C#
This tag can represent question about Expression Body operator for C#.
Questions tagged [expression-body]
16 questions
5
votes
2 answers
What does the first arrow operator in this Func mean?
Given this example code:
enum op
{
add,
remove
}
Func combo(string head, double tail) =>
(op op) =>
op == op.add ? Int32.Parse(head) + Convert.ToInt32(tail) : Int32.Parse(head) -…
Giulio Caccin
- 2,962
- 6
- 36
- 57
5
votes
2 answers
Expression-bodied members vs Lambda expressions
A lambda expression is a block of code (an expression or a statement block) that is treated as an object. It can be passed as an argument to methods, and it can also be returned by method calls.
(input parameters) => expression
SomeFunction(x =>…
Llazar
- 3,167
- 3
- 17
- 24
4
votes
2 answers
Changing a property to expression-bodied based on ReSharper leads to error?
one of my properties looks like this:
public string Name
{
get{ return _name; }
set { _name = value; }
}
but ReSharper is advising me to change it to:
public string Name
{
get => _name;
set => _name = value;
}
if I refactor like that then…
nshathish
- 417
- 8
- 23
2
votes
1 answer
C#: How to declare a checked switch-expression-bodied function?
I'm stuyding C# (10.0/.NET6) and I've got a question.
There is a code:
Int32 x = Int32.MaxValue;
Int32 y = Int32.MaxValue;
try
{
WriteLine($"{x} * {y} = {SomeFuncSwitch(x, y, 2)}");
WriteLine($"{x} + {y} = {SomeFunc(x, y)}");
}
catch (…
Old Skull
- 165
- 7
1
vote
0 answers
Are expression-bodied methods automatically inlined?
Are expression-bodied methods automatically inlined?
Are the following equivalent in non-debug compilation?
public byte[] GetBytes(char value) => GetBytesInternal(value, 2);
[MethodImpl(MethodImplOptions.AggressiveInlining)]
…
Herman Schoenfeld
- 8,464
- 4
- 38
- 49
1
vote
1 answer
Converting block body method with out parameter to expression body method causes out parameter to be null
I have the following method which is covered by passing unit tests;
public static bool TryGetInstance(out T config) where T : class
{
return Instance.TryGetInstance(out config);
}
When I convert this to expression body syntax…
mark_h
- 5,233
- 4
- 36
- 52
1
vote
2 answers
Multiple values in an expression-bodied set method of a property
Is it possible to set multiple values in a set method?
I want to do something like the following:
public int ID { get; set => {Property = value, ID=value}; }
Wouter
- 1,293
- 2
- 16
- 34
0
votes
0 answers
Using IDisposable in expression-bodied member
ShellFile implements IDisposable.
public string LocalizedName => new ShellFile(Executable).FileDescription;
I was unable to find anything on the internet about using disposable objects in expression-bodied members.
Is the ShellFile instance…
Scover
- 93
- 9
0
votes
2 answers
Expression-bodied members doesn't create new instances?
I'm curiuous why Expression-bodied properties doesn't create persisant objects.
public List Pages { get; } = new List();
Does create a persistant isntance of List, just like always.
But
public List Pages => new…
SpReeD
- 7
- 5
0
votes
2 answers
Declare inline variables everywhere in C# (like in a base-constructor-call where declaring is not feasible)
There are places where you can not declare new variables like in a base-constructor call (Exclaimer: this is an example to show-case the problem):
public class SportLicense : BaseEntity
{
public SportLicense() : base(
…
Daniel
- 486
- 4
- 19
0
votes
0 answers
Expression body constructor in ViewModel giives build errors
For some reason, I'm getting build errors when trying to use an expression body for the constructor if a viewmodel.
This works:
public class SolutionMaintenanceViewModel
{
public SolutionMaintenanceViewModel(IActiveUserService currUserSrv)
…
Sarov
- 545
- 6
- 17
-1
votes
3 answers
Expression bodied Function Weird Behavior
When I am using
var frontPage = await GetFrontPage();
protected override async Task GetFrontPage()
{
return null;
}
This code works fine and I am getting null value in frontpage variable. but when I am…
Srikrishna Sharma
- 159
- 1
- 12
-1
votes
1 answer
instantiate object property on get in one line
This is a question out of curious more so than actual need, but I thought it would be interesting to find out, since I have classes soo deep I need 10 lines of instantiation just to set a single property.
The property [MyObj3] functionally works as…
5tar-Kaster
- 910
- 2
- 12
- 30
-1
votes
1 answer
why is the return keyword not required in expression bodied methods
Looking at expression bodied methods, I am trying to understand why the return keyword is not used.
For example with
public int GetAge() { return this.Age; }
I would have expected
public int GetAge() => return this.Age;
as opposed to the…
Tim
- 115
- 7
-1
votes
1 answer
Why use expression-bodied properties for primitive values?
What are the pros and cons of expression-bodied properties vs straight property declarations? For example, is there any advantage to using;
public string Foo => "Bar"
vs simply
public string Foo = "Bar"
My understanding was the => is used when the…
TomDane
- 1,010
- 10
- 25