With block equivalent in C

Question

I know VB Net and am trying to brush up on my C    Is there a With block equivalent in C    Thanks

User · Answer

Although C  doesn t have any direct equivalent for the general case  C  3 gain object initializer syntax for constructor calls   var foo   new Foo   Property1   value1  Property2   value2  etc      See chapter 8 of C  in Depth for more details - you can download it for free from Manning s web site    Disclaimer - yes  it s in my interest to get the book into more people s hands  But hey  it s a free chapter which gives you more information on a related topic

User · Answer

Although C  doesn t have any direct equivalent for the general case  C  3 gain object initializer syntax for constructor calls   var foo   new Foo   Property1   value1  Property2   value2  etc      See chapter 8 of C  in Depth for more details - you can download it for free from Manning s web site    Disclaimer - yes  it s in my interest to get the book into more people s hands  But hey  it s a free chapter which gives you more information on a related topic

User · Answer

About 3 4 down the page in the  Using Objects  section   VB   With hero     Name    SpamMan      PowerLevel   3  End With    C      No  With  construct hero Name    SpamMan    hero PowerLevel   3

User · Answer

What I do is use a csharp ref keyword  For example   ref MySubClassType e   ref MyMainClass MySubClass    you can then use the shortcut like  e property instead of MyMainClass MySubClass property

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To make life a little easier you can use vertical selection to quickly edit things  http   joelabrahamsson com select-columns-of-text-in-visual-studio

User · Answer

As the Visual C  Program Manager linked above says  there are limited situations where the With statement is more efficient  the example he gives when it is being used as a shorthand to repeatedly access a complex expression    Using an extension method and generics you can create something that is vaguely equivalent to a With statement  by adding something like this       public static T With lt T gt  this T item  Action lt T gt  action                action item           return item          Taking a simple example of how it could be used  using lambda syntax you can then use it to change something like this        updateRoleFamily RoleFamilyDescription   roleFamilyDescription      updateRoleFamily RoleFamilyCode   roleFamilyCode    To this       updateRoleFamily With rf   gt                            rf RoleFamilyDescription   roleFamilyDescription                rf RoleFamilyCode   roleFamilyCode                  On an example like this  the only advantage is perhaps a nicer layout  but with a more complex reference and more properties  it could well give you more readable code

User · Answer

Although C  doesn t have any direct equivalent for the general case  C  3 gain object initializer syntax for constructor calls   var foo   new Foo   Property1   value1  Property2   value2  etc      See chapter 8 of C  in Depth for more details - you can download it for free from Manning s web site    Disclaimer - yes  it s in my interest to get the book into more people s hands  But hey  it s a free chapter which gives you more information on a related topic

User · Answer

About 3 4 down the page in the  Using Objects  section   VB   With hero     Name    SpamMan      PowerLevel   3  End With    C      No  With  construct hero Name    SpamMan    hero PowerLevel   3

User · Answer

You could use the argument accumulator pattern   Big discussion about this here   http   blogs msdn com csharpfaq archive 2004 03 11 87817 aspx

User · Answer

You could use the argument accumulator pattern   Big discussion about this here   http   blogs msdn com csharpfaq archive 2004 03 11 87817 aspx

User · Answer

I think the closets thing to  with  is static using  but only works with static s methods or properties  e g    using static System Math      public double Area      get   return PI   Pow Radius  2        PI    System Math PI     More Info  https   docs microsoft com en-us dotnet csharp language-reference keywords using-static

User · Answer

What I do is use a csharp ref keyword  For example   ref MySubClassType e   ref MyMainClass MySubClass    you can then use the shortcut like  e property instead of MyMainClass MySubClass property

User · Answer

A big fan of With here   This is literally my current C  code   if  SKYLib AccountsPayable Client ApiAuthorization Authorization AccessTokenExpiry    null    SKYLib AccountsPayable Client ApiAuthorization Authorization AccessTokenExpiry  lt  DateTime Now        SKYLib AccountsPayable Client ApiAuthorization Authorization Refresh         api   new SKYLib AccountsPayable Api DefaultApi new SKYLib AccountsPayable Client Configuration   DefaultHeader   SKYLib AccountsPayable Client ApiAuthorization Authorization ApiHeader         In VB it could be   With SKYLib AccountsPayable Client ApiAuthorization Authorization     If  AccessTokenExpiry Is Nothing OrElse  AccessTokenExpiry  lt  Now Then  Refresh        api   New SKYLib AccountsPayable Api DefaultApi New SKYLib AccountsPayable Client Configuration With  DefaultHeader    ApiHeaders  End With   Much clearer I think  You could even tweak it to be more concise by tuning the With variable  And  style-wise  I still have a choice  Perhaps something the C  Program Manager has overlooked   As an aside  it s not very common to see this  but I have used it on occasion   Instead of  Using oClient As HttpClient   New HttpClient     With oClient          BaseAddress   New Uri  http   mysite            Timeout   New TimeSpan 123           PostAsync            End With End Using   You can use  With New HttpClient      BaseAddress   New Uri  http   mysite        Timeout   New TimeSpan 123       PostAsync        End With   You risk a wrist-slapping - as do I for posting  - but it seems that you get all the benefits of a Using statement in terms of disposal  etc without the extra rigmarole   NOTE  This can go wrong occasionally  so only use it for non-critical code  Or not at all  Remember  You have a choice

User · Answer

If there are multiple levels of objects you can get similar functionality with the  using  directive   using System  using GenderType   Hero GenderType    This is the shorthand using directive public partial class Test   System Web UI Page       protected void Page Load object sender  EventArgs e                var myHero   new Hero            myHero Name    SpamMan           myHero PowerLevel   3          myHero Gender   GenderType Male    instead of myHero Gender   Hero GenderType Male          public class Hero       public enum GenderType               Male          Female          Other           public string Name      public int PowerLevel      public GenderType Gender

User · Answer

Sometimes you can get away with doing the following   var fill   cell Style Fill  fill PatternType   ExcelFillStyle Solid  fill BackgroundColor SetColor Color Gray   fill PatternColor   Color Black  fill Gradient          Code sample for EPPLus   http   zeeshanumardotnet blogspot com

User · Answer

hmm  I have never used VB net in any depth  so I m making an assumption here  but I think the  using  block might be close to what you want   using defines a block scope for a variable  see the example below  using   int temp   someFunction param1         temp        this works fine    temp       this blows up as temp is out of scope here and has been disposed   Here is an article from Microsoft that explains a bit more    EDIT  yeah  this answer is wrong - the original assumption was incorrect  VB s  WITH  is more like the new C  object initialisers   var yourVariable   new yourObject   param1   20  param2    some string

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To make life a little easier you can use vertical selection to quickly edit things  http   joelabrahamsson com select-columns-of-text-in-visual-studio

User · Answer

The with keywork  is introduced in C  version 9  you can use it to create copy of object like follows Person brother   person with   FirstName    quot Paul quot       quot The above line creates a new Person record where the LastName property is a copy of person  and the FirstName is  quot Paul quot   You can set any number of properties in a with-expression  Any of the synthesized members except the  quot clone quot  method may be written by you  If a record type has a method that matches the signature of any synthesized method  the compiler doesn t synthesize that method  quot  UPDATE  At the time this answer is written  C 9 is not officially released but in preview only  However  it is planned to be shipped along with  NET 5 0 in November 2020 for more information  check the record types

User · Answer

No  there is not

User · Answer

I think the closets thing to  with  is static using  but only works with static s methods or properties  e g    using static System Math      public double Area      get   return PI   Pow Radius  2        PI    System Math PI     More Info  https   docs microsoft com en-us dotnet csharp language-reference keywords using-static

User · Answer

No  there is not

User · Answer

About 3 4 down the page in the  Using Objects  section   VB   With hero     Name    SpamMan      PowerLevel   3  End With    C      No  With  construct hero Name    SpamMan    hero PowerLevel   3

User · Answer

You could use the argument accumulator pattern   Big discussion about this here   http   blogs msdn com csharpfaq archive 2004 03 11 87817 aspx

User · Answer

For me I was trying to auto generate code  and needed to reuse a simple variable like  quot x quot  for multiple different classes so that I didn t have to keep generating new variable names   I found that I could limit the scope of a variable and reuse it multiple times if I just put the code in a curly brace section     See the example  public class Main       public void Execute                    Execute new Foos and new Bars many times with same variable          double a   0          double b   0          double c   0          double d   0          double e   0          double f   0           double length   0          double area   0          double size   0                         Foo x   new Foo 5  6  Execute                a   x A              b   x B              c   x C              d   x D              e   x E              f   x F                                  Bar x   new Bar  quot red quot    quot circle quot   Execute                length   x Length              area   x Area              size   x Size                                  Foo x   new Foo 3  10  Execute                a   x A              b   x B              c   x C              d   x D              e   x E              f   x F                                  Bar x   new Bar  quot blue quot    quot square quot   Execute                length   x Length              area   x Area              size   x Size                     public class Foo       public int X   get  set        public int Y   get  set        public double A   get  private set        public double B   get  private set        public double C   get  private set        public double D   get  private set        public double E   get  private set        public double F   get  private set         public Foo int x  int y                X   x          Y   y             public Foo Execute                 A   X   Y          B   X   Y          C   X    X   Y   1           D   Y    X   Y   1           E    X   Y     X   Y   1           F    Y - X     X   Y   1           return this           public class Bar       public string Color   get  set        public string Shape   get  set        public double Size   get  private set        public double Area   get  private set        public double Length   get  private set             public Bar string color  string shape                Color   color          Shape   shape             public Bar Execute                 Length   Color Length   Shape Length          Area   Color Length   Shape Length          Size   Area   Length          return this           In VB I would have used the With and not needed variable  quot x quot  at all   Excluding the vb class definitions of Foo and Bar  the vb code is  Public Class Main     Public Sub Execute           Dim a As Double   0         Dim b As Double   0         Dim c As Double   0         Dim d As Double   0         Dim e As Double   0         Dim f As Double   0         Dim length As Double   0         Dim area As Double   0         Dim size As Double   0          With New Foo 5  6  Execute               a    A             b    B             c    C             d    D             e    E             f    F         End With          With New Bar  quot red quot    quot circle quot   Execute               length    Length             area    Area             size    Size         End With          With New Foo 3  10  Execute               a    A             b    B             c    C             d    D             e    E             f    F         End With          With New Bar  quot blue quot    quot square quot   Execute               length    Length             area    Area             size    Size         End With     End Sub End Class

User · Answer

If there are multiple levels of objects you can get similar functionality with the  using  directive   using System  using GenderType   Hero GenderType    This is the shorthand using directive public partial class Test   System Web UI Page       protected void Page Load object sender  EventArgs e                var myHero   new Hero            myHero Name    SpamMan           myHero PowerLevel   3          myHero Gender   GenderType Male    instead of myHero Gender   Hero GenderType Male          public class Hero       public enum GenderType               Male          Female          Other           public string Name      public int PowerLevel      public GenderType Gender

User · Answer

No  there is not

User · Answer

There is another an interesting implementation of with-pattern  public static T With lt T gt  this T o  params object   pattern    gt  o  public static T To lt T gt  this T o  out T x    gt  x   o    You may browse more details by the link and research online code samples   Variations of usage  static Point Sample0     gt  new Point   To out var p  With      p X   123      p Y   321      p Name    abc      public static Point GetPoint     gt  new Point   Name    Point Name     static string NameProperty   get  set    static string NameField   static void Sample1         string nameLocal      GetPoint   To out var p  With          p X   123          p Y   321          p Name To out var name      right side assignment to the new variable            p Name To out nameLocal      right side assignment to the declared var            NameField   p Name     left side assignment to the declared variable            NameProperty   p Name    left side assignment to the property                Console WriteLine name       Console WriteLine nameLocal       Console WriteLine NameField       Console WriteLine NameProperty      static void Sample2      non-null propogation sample            Point null  To out var p   With          p X   123          p Y   321          p Name To out var name              Console WriteLine  No exception       static void Sample3      recursion          GetPerson   To out var p  With          p Name To out var name           p Subperson To out var p0  With              p0 Name To out var subpersonName0                     p GetSubperson   To out var p1  With     method return                p1 Name To out var subpersonName1                        Console WriteLine subpersonName0       Console WriteLine subpersonName1       If you work with structs  value types  the similar extension method will be useful too  public static TR Let lt T  TR gt  this T o  TR y    gt  y    May be applied after With method because by default will be returned the unmodified copy of struct  struct Point       public double X      public double Y      public string Name     static Point Sample0     gt  new Point   To out var p  With      p X   123      p Y   321      p Name    abc    Let p     Enjoy if you like

User · Answer

This is what Visual C  program manager has to say  Why doesn t C  have a  with  statement      Many people  including the C  language designers  believe that  with    often harms readability  and is more of a curse than a blessing  It is   clearer to declare a local variable with a meaningful name  and use   that variable to perform multiple operations on a single object  than   it is to have a block with a sort of implicit context

User · Answer

hmm  I have never used VB net in any depth  so I m making an assumption here  but I think the  using  block might be close to what you want   using defines a block scope for a variable  see the example below  using   int temp   someFunction param1         temp        this works fine    temp       this blows up as temp is out of scope here and has been disposed   Here is an article from Microsoft that explains a bit more    EDIT  yeah  this answer is wrong - the original assumption was incorrect  VB s  WITH  is more like the new C  object initialisers   var yourVariable   new yourObject   param1   20  param2    some string

User · Answer

I was using this way           worksheet get Range 11  1  11  41               SetHeadFontStyle                SetHeadFillStyle 45               SetBorders                  XlBorderWeight xlMedium                   XlBorderWeight xlThick                   XlBorderWeight xlMedium                   XlBorderWeight xlThick                  SetHeadFontStyle   SetHeadFillStyle is ExtMethod of Range like below    public static Range SetHeadFillStyle this Range rng  int colorIndex            do some operation      return rng       do some operation and return the Range for next operation  it s look like Linq     but now still can t fully look like it -- propery set value  with cell Border xlEdgeTop      LineStyle   xlContinuous     Weight   xlMedium     ColorIndex   xlAutomatic

User · Answer

About 3 4 down the page in the  Using Objects  section   VB   With hero     Name    SpamMan      PowerLevel   3  End With    C      No  With  construct hero Name    SpamMan    hero PowerLevel   3

User · Answer

hmm  I have never used VB net in any depth  so I m making an assumption here  but I think the  using  block might be close to what you want   using defines a block scope for a variable  see the example below  using   int temp   someFunction param1         temp        this works fine    temp       this blows up as temp is out of scope here and has been disposed   Here is an article from Microsoft that explains a bit more    EDIT  yeah  this answer is wrong - the original assumption was incorrect  VB s  WITH  is more like the new C  object initialisers   var yourVariable   new yourObject   param1   20  param2    some string

User · Answer

A big fan of With here   This is literally my current C  code   if  SKYLib AccountsPayable Client ApiAuthorization Authorization AccessTokenExpiry    null    SKYLib AccountsPayable Client ApiAuthorization Authorization AccessTokenExpiry  lt  DateTime Now        SKYLib AccountsPayable Client ApiAuthorization Authorization Refresh         api   new SKYLib AccountsPayable Api DefaultApi new SKYLib AccountsPayable Client Configuration   DefaultHeader   SKYLib AccountsPayable Client ApiAuthorization Authorization ApiHeader         In VB it could be   With SKYLib AccountsPayable Client ApiAuthorization Authorization     If  AccessTokenExpiry Is Nothing OrElse  AccessTokenExpiry  lt  Now Then  Refresh        api   New SKYLib AccountsPayable Api DefaultApi New SKYLib AccountsPayable Client Configuration With  DefaultHeader    ApiHeaders  End With   Much clearer I think  You could even tweak it to be more concise by tuning the With variable  And  style-wise  I still have a choice  Perhaps something the C  Program Manager has overlooked   As an aside  it s not very common to see this  but I have used it on occasion   Instead of  Using oClient As HttpClient   New HttpClient     With oClient          BaseAddress   New Uri  http   mysite            Timeout   New TimeSpan 123           PostAsync            End With End Using   You can use  With New HttpClient      BaseAddress   New Uri  http   mysite        Timeout   New TimeSpan 123       PostAsync        End With   You risk a wrist-slapping - as do I for posting  - but it seems that you get all the benefits of a Using statement in terms of disposal  etc without the extra rigmarole   NOTE  This can go wrong occasionally  so only use it for non-critical code  Or not at all  Remember  You have a choice

User · Answer

You could use the argument accumulator pattern   Big discussion about this here   http   blogs msdn com csharpfaq archive 2004 03 11 87817 aspx

User · Answer

No  there is not

User · Answer

As the Visual C  Program Manager linked above says  there are limited situations where the With statement is more efficient  the example he gives when it is being used as a shorthand to repeatedly access a complex expression    Using an extension method and generics you can create something that is vaguely equivalent to a With statement  by adding something like this       public static T With lt T gt  this T item  Action lt T gt  action                action item           return item          Taking a simple example of how it could be used  using lambda syntax you can then use it to change something like this        updateRoleFamily RoleFamilyDescription   roleFamilyDescription      updateRoleFamily RoleFamilyCode   roleFamilyCode    To this       updateRoleFamily With rf   gt                            rf RoleFamilyDescription   roleFamilyDescription                rf RoleFamilyCode   roleFamilyCode                  On an example like this  the only advantage is perhaps a nicer layout  but with a more complex reference and more properties  it could well give you more readable code

User · Answer

There is another an interesting implementation of with-pattern  public static T With lt T gt  this T o  params object   pattern    gt  o  public static T To lt T gt  this T o  out T x    gt  x   o    You may browse more details by the link and research online code samples   Variations of usage  static Point Sample0     gt  new Point   To out var p  With      p X   123      p Y   321      p Name    abc      public static Point GetPoint     gt  new Point   Name    Point Name     static string NameProperty   get  set    static string NameField   static void Sample1         string nameLocal      GetPoint   To out var p  With          p X   123          p Y   321          p Name To out var name      right side assignment to the new variable            p Name To out nameLocal      right side assignment to the declared var            NameField   p Name     left side assignment to the declared variable            NameProperty   p Name    left side assignment to the property                Console WriteLine name       Console WriteLine nameLocal       Console WriteLine NameField       Console WriteLine NameProperty      static void Sample2      non-null propogation sample            Point null  To out var p   With          p X   123          p Y   321          p Name To out var name              Console WriteLine  No exception       static void Sample3      recursion          GetPerson   To out var p  With          p Name To out var name           p Subperson To out var p0  With              p0 Name To out var subpersonName0                     p GetSubperson   To out var p1  With     method return                p1 Name To out var subpersonName1                        Console WriteLine subpersonName0       Console WriteLine subpersonName1       If you work with structs  value types  the similar extension method will be useful too  public static TR Let lt T  TR gt  this T o  TR y    gt  y    May be applied after With method because by default will be returned the unmodified copy of struct  struct Point       public double X      public double Y      public string Name     static Point Sample0     gt  new Point   To out var p  With      p X   123      p Y   321      p Name    abc    Let p     Enjoy if you like

User · Answer

The with keywork  is introduced in C  version 9  you can use it to create copy of object like follows Person brother   person with   FirstName    quot Paul quot       quot The above line creates a new Person record where the LastName property is a copy of person  and the FirstName is  quot Paul quot   You can set any number of properties in a with-expression  Any of the synthesized members except the  quot clone quot  method may be written by you  If a record type has a method that matches the signature of any synthesized method  the compiler doesn t synthesize that method  quot  UPDATE  At the time this answer is written  C 9 is not officially released but in preview only  However  it is planned to be shipped along with  NET 5 0 in November 2020 for more information  check the record types

User · Answer

Most simple syntax would be          var where   new MyObject        where property    xxx       where SomeFunction  yyy             var where   new MyObject        where property    zzz       where SomeFunction  uuu        Actually extra code-blocks like that are very handy if you want to re-use variable names

User · Answer

hmm  I have never used VB net in any depth  so I m making an assumption here  but I think the  using  block might be close to what you want   using defines a block scope for a variable  see the example below  using   int temp   someFunction param1         temp        this works fine    temp       this blows up as temp is out of scope here and has been disposed   Here is an article from Microsoft that explains a bit more    EDIT  yeah  this answer is wrong - the original assumption was incorrect  VB s  WITH  is more like the new C  object initialisers   var yourVariable   new yourObject   param1   20  param2    some string

User · Answer

Although C  doesn t have any direct equivalent for the general case  C  3 gain object initializer syntax for constructor calls   var foo   new Foo   Property1   value1  Property2   value2  etc      See chapter 8 of C  in Depth for more details - you can download it for free from Manning s web site    Disclaimer - yes  it s in my interest to get the book into more people s hands  But hey  it s a free chapter which gives you more information on a related topic

User · Answer

This is what Visual C  program manager has to say  Why doesn t C  have a  with  statement      Many people  including the C  language designers  believe that  with    often harms readability  and is more of a curse than a blessing  It is   clearer to declare a local variable with a meaningful name  and use   that variable to perform multiple operations on a single object  than   it is to have a block with a sort of implicit context

User · Answer

Sometimes you can get away with doing the following   var fill   cell Style Fill  fill PatternType   ExcelFillStyle Solid  fill BackgroundColor SetColor Color Gray   fill PatternColor   Color Black  fill Gradient          Code sample for EPPLus   http   zeeshanumardotnet blogspot com

User · Answer

I was using this way           worksheet get Range 11  1  11  41               SetHeadFontStyle                SetHeadFillStyle 45               SetBorders                  XlBorderWeight xlMedium                   XlBorderWeight xlThick                   XlBorderWeight xlMedium                   XlBorderWeight xlThick                  SetHeadFontStyle   SetHeadFillStyle is ExtMethod of Range like below    public static Range SetHeadFillStyle this Range rng  int colorIndex            do some operation      return rng       do some operation and return the Range for next operation  it s look like Linq     but now still can t fully look like it -- propery set value  with cell Border xlEdgeTop      LineStyle   xlContinuous     Weight   xlMedium     ColorIndex   xlAutomatic

User · Answer

Most simple syntax would be          var where   new MyObject        where property    xxx       where SomeFunction  yyy             var where   new MyObject        where property    zzz       where SomeFunction  uuu        Actually extra code-blocks like that are very handy if you want to re-use variable names

User · Answer

For me I was trying to auto generate code  and needed to reuse a simple variable like  quot x quot  for multiple different classes so that I didn t have to keep generating new variable names   I found that I could limit the scope of a variable and reuse it multiple times if I just put the code in a curly brace section     See the example  public class Main       public void Execute                    Execute new Foos and new Bars many times with same variable          double a   0          double b   0          double c   0          double d   0          double e   0          double f   0           double length   0          double area   0          double size   0                         Foo x   new Foo 5  6  Execute                a   x A              b   x B              c   x C              d   x D              e   x E              f   x F                                  Bar x   new Bar  quot red quot    quot circle quot   Execute                length   x Length              area   x Area              size   x Size                                  Foo x   new Foo 3  10  Execute                a   x A              b   x B              c   x C              d   x D              e   x E              f   x F                                  Bar x   new Bar  quot blue quot    quot square quot   Execute                length   x Length              area   x Area              size   x Size                     public class Foo       public int X   get  set        public int Y   get  set        public double A   get  private set        public double B   get  private set        public double C   get  private set        public double D   get  private set        public double E   get  private set        public double F   get  private set         public Foo int x  int y                X   x          Y   y             public Foo Execute                 A   X   Y          B   X   Y          C   X    X   Y   1           D   Y    X   Y   1           E    X   Y     X   Y   1           F    Y - X     X   Y   1           return this           public class Bar       public string Color   get  set        public string Shape   get  set        public double Size   get  private set        public double Area   get  private set        public double Length   get  private set             public Bar string color  string shape                Color   color          Shape   shape             public Bar Execute                 Length   Color Length   Shape Length          Area   Color Length   Shape Length          Size   Area   Length          return this           In VB I would have used the With and not needed variable  quot x quot  at all   Excluding the vb class definitions of Foo and Bar  the vb code is  Public Class Main     Public Sub Execute           Dim a As Double   0         Dim b As Double   0         Dim c As Double   0         Dim d As Double   0         Dim e As Double   0         Dim f As Double   0         Dim length As Double   0         Dim area As Double   0         Dim size As Double   0          With New Foo 5  6  Execute               a    A             b    B             c    C             d    D             e    E             f    F         End With          With New Bar  quot red quot    quot circle quot   Execute               length    Length             area    Area             size    Size         End With          With New Foo 3  10  Execute               a    A             b    B             c    C             d    D             e    E             f    F         End With          With New Bar  quot blue quot    quot square quot   Execute               length    Length             area    Area             size    Size         End With     End Sub End Class

[c#] With block equivalent in C#?

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