C# - How to create constructor for inherited class where parent class only has static constructor
For example, say I wanted to create a class that inherits System.Diagnostics.StopWatch, and for this example pretend that System.Diagnostics.Stopwatch.StartNew() is the only public constructor for that class (I know its not, but I'm trying to inherit a different class where that is the case) :
public class Example : System.Diagnostics.Stopwatch
public Example()
// ... return System.Diagnostics.Stopwatch.StartNew();
I know there are obvious workarounds, but just wondering if this is possible in C#
c# inheritance constructor static
asked Nov 11 at 17:47
mSours
213
|
show 5 more comments
For example, say I wanted to create a class that inherits System.Diagnostics.StopWatch, and for this example pretend that System.Diagnostics.Stopwatch.StartNew() is the only public constructor for that class (I know its not, but I'm trying to inherit a different class where that is the case) :
public class Example : System.Diagnostics.Stopwatch
public Example()
// ... return System.Diagnostics.Stopwatch.StartNew();
I know there are obvious workarounds, but just wondering if this is possible in C#
c# inheritance constructor static
asked Nov 11 at 17:47
mSours
213
You can't do that.
– SLaks
Nov 11 at 17:48
2
StartNew()isnt a constructor
– Adrian
Nov 11 at 17:48
The best you can do ispublic static new Example StartNew() var e = new Example(); e.Start(); return e;
– Lasse Vågsæther Karlsen
Nov 11 at 17:54
Often classes are designed this way for the specific purpose of preventing inheritance. If there are no accessible constructors then you can't inherit from the class.
– Mike Zboray
Nov 11 at 19:18
Please show your real case so we can really help you.
– Aldert
Nov 11 at 19:23
|
show 5 more comments
For example, say I wanted to create a class that inherits System.Diagnostics.StopWatch, and for this example pretend that System.Diagnostics.Stopwatch.StartNew() is the only public constructor for that class (I know its not, but I'm trying to inherit a different class where that is the case) :
public class Example : System.Diagnostics.Stopwatch
public Example()
// ... return System.Diagnostics.Stopwatch.StartNew();
I know there are obvious workarounds, but just wondering if this is possible in C#
c# inheritance constructor static
asked Nov 11 at 17:47
mSours
213
For example, say I wanted to create a class that inherits System.Diagnostics.StopWatch, and for this example pretend that System.Diagnostics.Stopwatch.StartNew() is the only public constructor for that class (I know its not, but I'm trying to inherit a different class where that is the case) :
public class Example : System.Diagnostics.Stopwatch
public Example()
// ... return System.Diagnostics.Stopwatch.StartNew();
I know there are obvious workarounds, but just wondering if this is possible in C#
c# inheritance constructor static
c# inheritance constructor static
asked Nov 11 at 17:47
mSours
213
asked Nov 11 at 17:47
mSours
213
asked Nov 11 at 17:47
mSours
213
asked Nov 11 at 17:47
mSours
213
asked Nov 11 at 17:47
mSours
213
213
You can't do that.
– SLaks
Nov 11 at 17:48
2
StartNew()isnt a constructor
– Adrian
Nov 11 at 17:48
The best you can do ispublic static new Example StartNew() var e = new Example(); e.Start(); return e;
– Lasse Vågsæther Karlsen
Nov 11 at 17:54
Often classes are designed this way for the specific purpose of preventing inheritance. If there are no accessible constructors then you can't inherit from the class.
– Mike Zboray
Nov 11 at 19:18
Please show your real case so we can really help you.
– Aldert
Nov 11 at 19:23
|
show 5 more comments
You can't do that.
– SLaks
Nov 11 at 17:48
2
StartNew()isnt a constructor
– Adrian
Nov 11 at 17:48
The best you can do ispublic static new Example StartNew() var e = new Example(); e.Start(); return e;
– Lasse Vågsæther Karlsen
Nov 11 at 17:54
Often classes are designed this way for the specific purpose of preventing inheritance. If there are no accessible constructors then you can't inherit from the class.
– Mike Zboray
Nov 11 at 19:18
Please show your real case so we can really help you.
– Aldert
Nov 11 at 19:23
You can't do that.
– SLaks
Nov 11 at 17:48
You can't do that.
– SLaks
Nov 11 at 17:48
2
2
StartNew() isnt a constructor– Adrian
Nov 11 at 17:48
StartNew() isnt a constructor– Adrian
Nov 11 at 17:48
The best you can do is
public static new Example StartNew() var e = new Example(); e.Start(); return e; – Lasse Vågsæther Karlsen
Nov 11 at 17:54
The best you can do is
public static new Example StartNew() var e = new Example(); e.Start(); return e; – Lasse Vågsæther Karlsen
Nov 11 at 17:54
Often classes are designed this way for the specific purpose of preventing inheritance. If there are no accessible constructors then you can't inherit from the class.
– Mike Zboray
Nov 11 at 19:18
Often classes are designed this way for the specific purpose of preventing inheritance. If there are no accessible constructors then you can't inherit from the class.
– Mike Zboray
Nov 11 at 19:18
Please show your real case so we can really help you.
– Aldert
Nov 11 at 19:23
Please show your real case so we can really help you.
– Aldert
Nov 11 at 19:23
|
show 5 more comments
1 Answer
1
active
oldest
votes
There are basically three scenarios where you can't inherit from a class:
- The intended parent class is declared as sealed, which prohibits inheriting from it.
- The intended parent class doesn't have an accessible constructor.
- The intended parent class is a static class.
If you are in one of these 3 scenarios, you will not be able to inherit from that class, plain and simple, don't look for a usable workaround because there isn't.
answered Nov 11 at 19:27
InBetween
25k33967
Case 2 is not technically correct. In C# 5 you can declare class like this:class B private B() class D: B D(): this(1) D(int i): this()which does not reference base class constructor, thus its accessibility does not matter.
– PetSerAl
Nov 12 at 1:00
@PetSerAl If that compiles in c#5 (can’t test it now) then it’s a compiler bug, not a language feature. It sure doesn’t compile in the current version, if it did you’d get a StackOverflowException when run.
– InBetween
Nov 12 at 5:16
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1 Answer
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1 Answer
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active
oldest
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oldest
votes
There are basically three scenarios where you can't inherit from a class:
- The intended parent class is declared as sealed, which prohibits inheriting from it.
- The intended parent class doesn't have an accessible constructor.
- The intended parent class is a static class.
If you are in one of these 3 scenarios, you will not be able to inherit from that class, plain and simple, don't look for a usable workaround because there isn't.
answered Nov 11 at 19:27
InBetween
25k33967
Case 2 is not technically correct. In C# 5 you can declare class like this:class B private B() class D: B D(): this(1) D(int i): this()which does not reference base class constructor, thus its accessibility does not matter.
– PetSerAl
Nov 12 at 1:00
@PetSerAl If that compiles in c#5 (can’t test it now) then it’s a compiler bug, not a language feature. It sure doesn’t compile in the current version, if it did you’d get a StackOverflowException when run.
– InBetween
Nov 12 at 5:16
add a comment |
There are basically three scenarios where you can't inherit from a class:
- The intended parent class is declared as sealed, which prohibits inheriting from it.
- The intended parent class doesn't have an accessible constructor.
- The intended parent class is a static class.
If you are in one of these 3 scenarios, you will not be able to inherit from that class, plain and simple, don't look for a usable workaround because there isn't.
answered Nov 11 at 19:27
InBetween
25k33967
Case 2 is not technically correct. In C# 5 you can declare class like this:class B private B() class D: B D(): this(1) D(int i): this()which does not reference base class constructor, thus its accessibility does not matter.
– PetSerAl
Nov 12 at 1:00
@PetSerAl If that compiles in c#5 (can’t test it now) then it’s a compiler bug, not a language feature. It sure doesn’t compile in the current version, if it did you’d get a StackOverflowException when run.
– InBetween
Nov 12 at 5:16
add a comment |
There are basically three scenarios where you can't inherit from a class:
- The intended parent class is declared as sealed, which prohibits inheriting from it.
- The intended parent class doesn't have an accessible constructor.
- The intended parent class is a static class.
If you are in one of these 3 scenarios, you will not be able to inherit from that class, plain and simple, don't look for a usable workaround because there isn't.
answered Nov 11 at 19:27
InBetween
25k33967
There are basically three scenarios where you can't inherit from a class:
- The intended parent class is declared as sealed, which prohibits inheriting from it.
- The intended parent class doesn't have an accessible constructor.
- The intended parent class is a static class.
If you are in one of these 3 scenarios, you will not be able to inherit from that class, plain and simple, don't look for a usable workaround because there isn't.
answered Nov 11 at 19:27
InBetween
25k33967
edited Nov 11 at 20:17
answered Nov 11 at 19:27
InBetween
25k33967
answered Nov 11 at 19:27
InBetween
25k33967
answered Nov 11 at 19:27
InBetween
25k33967
25k33967
Case 2 is not technically correct. In C# 5 you can declare class like this:class B private B() class D: B D(): this(1) D(int i): this()which does not reference base class constructor, thus its accessibility does not matter.
– PetSerAl
Nov 12 at 1:00
@PetSerAl If that compiles in c#5 (can’t test it now) then it’s a compiler bug, not a language feature. It sure doesn’t compile in the current version, if it did you’d get a StackOverflowException when run.
– InBetween
Nov 12 at 5:16
add a comment |
Case 2 is not technically correct. In C# 5 you can declare class like this:class B private B() class D: B D(): this(1) D(int i): this()which does not reference base class constructor, thus its accessibility does not matter.
– PetSerAl
Nov 12 at 1:00
@PetSerAl If that compiles in c#5 (can’t test it now) then it’s a compiler bug, not a language feature. It sure doesn’t compile in the current version, if it did you’d get a StackOverflowException when run.
– InBetween
Nov 12 at 5:16
Case 2 is not technically correct. In C# 5 you can declare class like this:
class B private B() class D: B D(): this(1) D(int i): this() which does not reference base class constructor, thus its accessibility does not matter.– PetSerAl
Nov 12 at 1:00
Case 2 is not technically correct. In C# 5 you can declare class like this:
class B private B() class D: B D(): this(1) D(int i): this() which does not reference base class constructor, thus its accessibility does not matter.– PetSerAl
Nov 12 at 1:00
@PetSerAl If that compiles in c#5 (can’t test it now) then it’s a compiler bug, not a language feature. It sure doesn’t compile in the current version, if it did you’d get a StackOverflowException when run.
– InBetween
Nov 12 at 5:16
@PetSerAl If that compiles in c#5 (can’t test it now) then it’s a compiler bug, not a language feature. It sure doesn’t compile in the current version, if it did you’d get a StackOverflowException when run.
– InBetween
Nov 12 at 5:16
add a comment |
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You can't do that.
– SLaks
Nov 11 at 17:48
2
StartNew()isnt a constructor– Adrian
Nov 11 at 17:48
The best you can do is
public static new Example StartNew() var e = new Example(); e.Start(); return e;– Lasse Vågsæther Karlsen
Nov 11 at 17:54
Often classes are designed this way for the specific purpose of preventing inheritance. If there are no accessible constructors then you can't inherit from the class.
– Mike Zboray
Nov 11 at 19:18
Please show your real case so we can really help you.
– Aldert
Nov 11 at 19:23