Parse v TryParse

Question

What is the difference between Parse   and TryParse     int number   int Parse textBoxNumber Text       The Try-Parse Method int TryParse textBoxNumber Text  out number     Is there some form of error-checking like a Try-Catch Block

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For the record  I am testing two codes  That simply try to convert from a string to a number and if it fail then assign  number to zero           if   Int32 TryParse txt out tmpint                 tmpint   0              and           try               tmpint   Convert ToInt32 txt             catch  Exception                tmpint   0              For c   the best option is to use tryparse because try amp Catch alternative thrown the exception  A first chance exception of type  System FormatException  occurred in mscorlib dll   That it is painful slow and undesirable  however  the code does not stop unless Debug s exception are settled for stop with it

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Parse throws an exception if it cannot parse the value  whereas TryParse returns a bool indicating whether it succeeded   TryParse does not just try catch internally - the whole point of it is that it is implemented without exceptions so that it is fast  In fact the way it is most likely implemented is that internally the Parse method will call TryParse and then throw an exception if it returns false   In a nutshell  use Parse if you are sure the value will be valid  otherwise use TryParse

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I know its a very old post but thought of sharing few more details on Parse vs TryParse   I had a scenario where DateTime needs to be converted to String and if datevalue null or string empty we were facing an exception  In order to overcome this  we have replaced Parse with TryParse and will get default date   Old Code   dTest i  StartDate   DateTime Parse StartDate  ToString  MM dd yyyy    dTest i  EndDate   DateTime Parse EndDate  ToString  MM dd yyyy      New Code   DateTime startDate   default DateTime   DateTime endDate default DateTime   DateTime TryParse dPolicyPaidHistories i  StartDate  out startDate   DateTime TryParse dPolicyPaidHistories i  EndDate  out endDate     Have to declare another variable and used as Out for TryParse

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TryParse and the Exception Tax  Parse throws an exception if the conversion from a string to the specified datatype fails  whereas TryParse explicitly avoids throwing an exception

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TryParse and the Exception Tax  Parse throws an exception if the conversion from a string to the specified datatype fails  whereas TryParse explicitly avoids throwing an exception

User · Answer

Parse throws an exception if it cannot parse the value  whereas TryParse returns a bool indicating whether it succeeded   TryParse does not just try catch internally - the whole point of it is that it is implemented without exceptions so that it is fast  In fact the way it is most likely implemented is that internally the Parse method will call TryParse and then throw an exception if it returns false   In a nutshell  use Parse if you are sure the value will be valid  otherwise use TryParse

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TryParse does not return the value  it returns a status code to indicate whether the parse succeeded  and doesn t throw an exception

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For the record  I am testing two codes  That simply try to convert from a string to a number and if it fail then assign  number to zero           if   Int32 TryParse txt out tmpint                 tmpint   0              and           try               tmpint   Convert ToInt32 txt             catch  Exception                tmpint   0              For c   the best option is to use tryparse because try amp Catch alternative thrown the exception  A first chance exception of type  System FormatException  occurred in mscorlib dll   That it is painful slow and undesirable  however  the code does not stop unless Debug s exception are settled for stop with it

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The TryParse method allows you to test whether something is parseable   If you try Parse as in the first instance with an invalid int  you ll get an exception while in the TryParse  it returns a boolean letting you know whether the parse succeeded or not   As a footnote  passing in null to most TryParse methods will throw an exception

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If the string can not be converted to an integer  then   int Parse   will throw an exception int TryParse   will return false  but not throw an exception

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The TryParse method allows you to test whether something is parseable   If you try Parse as in the first instance with an invalid int  you ll get an exception while in the TryParse  it returns a boolean letting you know whether the parse succeeded or not   As a footnote  passing in null to most TryParse methods will throw an exception

User · Answer

TryParse and the Exception Tax  Parse throws an exception if the conversion from a string to the specified datatype fails  whereas TryParse explicitly avoids throwing an exception

User · Answer

TryParse does not return the value  it returns a status code to indicate whether the parse succeeded  and doesn t throw an exception

User · Answer

The TryParse method allows you to test whether something is parseable   If you try Parse as in the first instance with an invalid int  you ll get an exception while in the TryParse  it returns a boolean letting you know whether the parse succeeded or not   As a footnote  passing in null to most TryParse methods will throw an exception

User · Answer

The TryParse method allows you to test whether something is parseable   If you try Parse as in the first instance with an invalid int  you ll get an exception while in the TryParse  it returns a boolean letting you know whether the parse succeeded or not   As a footnote  passing in null to most TryParse methods will throw an exception

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double Parse  -    raises an exception  while double TryParse  -   out parsed   parses to 0 so I guess TryParse does more complex conversions

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If the string can not be converted to an integer  then   int Parse   will throw an exception int TryParse   will return false  but not throw an exception

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If the string can not be converted to an integer  then   int Parse   will throw an exception int TryParse   will return false  but not throw an exception

User · Answer

Parse throws an exception if it cannot parse the value  whereas TryParse returns a bool indicating whether it succeeded   TryParse does not just try catch internally - the whole point of it is that it is implemented without exceptions so that it is fast  In fact the way it is most likely implemented is that internally the Parse method will call TryParse and then throw an exception if it returns false   In a nutshell  use Parse if you are sure the value will be valid  otherwise use TryParse

User · Answer

Parse throws an exception if it cannot parse the value  whereas TryParse returns a bool indicating whether it succeeded   TryParse does not just try catch internally - the whole point of it is that it is implemented without exceptions so that it is fast  In fact the way it is most likely implemented is that internally the Parse method will call TryParse and then throw an exception if it returns false   In a nutshell  use Parse if you are sure the value will be valid  otherwise use TryParse

User · Answer

TryParse does not return the value  it returns a status code to indicate whether the parse succeeded  and doesn t throw an exception

User · Answer

I know its a very old post but thought of sharing few more details on Parse vs TryParse   I had a scenario where DateTime needs to be converted to String and if datevalue null or string empty we were facing an exception  In order to overcome this  we have replaced Parse with TryParse and will get default date   Old Code   dTest i  StartDate   DateTime Parse StartDate  ToString  MM dd yyyy    dTest i  EndDate   DateTime Parse EndDate  ToString  MM dd yyyy      New Code   DateTime startDate   default DateTime   DateTime endDate default DateTime   DateTime TryParse dPolicyPaidHistories i  StartDate  out startDate   DateTime TryParse dPolicyPaidHistories i  EndDate  out endDate     Have to declare another variable and used as Out for TryParse

User · Answer

TryParse and the Exception Tax  Parse throws an exception if the conversion from a string to the specified datatype fails  whereas TryParse explicitly avoids throwing an exception

User · Answer

If the string can not be converted to an integer  then   int Parse   will throw an exception int TryParse   will return false  but not throw an exception

User · Answer

double Parse  -    raises an exception  while double TryParse  -   out parsed   parses to 0 so I guess TryParse does more complex conversions

User · Answer

TryParse does not return the value  it returns a status code to indicate whether the parse succeeded  and doesn t throw an exception

[c#] Parse v. TryParse

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