How to try convert a string to a Guid

Question

I did not find the TryParse method for the Guid   I   m wondering how others handle converting a guid in string format into a guid type   Guid Id  try       Id   new Guid Request QueryString  id       catch       Id   Guid Empty

User · Answer

Unfortunately  there isn t a TryParse   equivalent   If you create a new instance of a System Guid and pass the string value in  you can catch the three possible exceptions it would throw if it is invalid   Those are    ArgumentNullException FormatException OverflowException   I have seen some implementations where you can do a regex on the string prior to creating the instance  if you are just trying to validate it and not create it

User · Answer

new Guid string    You could also look at using a TypeConverter

User · Answer

Unfortunately  there isn t a TryParse   equivalent   If you create a new instance of a System Guid and pass the string value in  you can catch the three possible exceptions it would throw if it is invalid   Those are    ArgumentNullException FormatException OverflowException   I have seen some implementations where you can do a regex on the string prior to creating the instance  if you are just trying to validate it and not create it

User · Answer

This will get you pretty close  and I use it in production and have never had a collision   However  if you look at the constructor for a guid in reflector  you will see all of the checks it makes    public static bool GuidTryParse string s  out Guid result                if   String IsNullOrEmpty s   amp  amp  guidRegEx IsMatch s                         result   new Guid s               return true                     result   default Guid           return false             static Regex guidRegEx   new Regex    A-Fa-f0-9  32                                            A-Fa-f0-9  8 -  A-Fa-f0-9  4 -  3  A-Fa-f0-9  12                                                0xA-Fa-f0-9  3 10     0 1  0xA-Fa-f0-9  3 6   2    0 1      0xA-Fa-f0-9  3 4    0 1   7  0xA-Fa-f0-9  3 4         RegexOptions Compiled

User · Answer

This will get you pretty close  and I use it in production and have never had a collision   However  if you look at the constructor for a guid in reflector  you will see all of the checks it makes    public static bool GuidTryParse string s  out Guid result                if   String IsNullOrEmpty s   amp  amp  guidRegEx IsMatch s                         result   new Guid s               return true                     result   default Guid           return false             static Regex guidRegEx   new Regex    A-Fa-f0-9  32                                            A-Fa-f0-9  8 -  A-Fa-f0-9  4 -  3  A-Fa-f0-9  12                                                0xA-Fa-f0-9  3 10     0 1  0xA-Fa-f0-9  3 6   2    0 1      0xA-Fa-f0-9  3 4    0 1   7  0xA-Fa-f0-9  3 4         RegexOptions Compiled

User · Answer

use code like this   new Guid  9D2B0228-4D0D-4C23-8B49-01A698857709     instead of  9D2B0228-4D0D-4C23-8B49-01A698857709  you can set your string value

User · Answer

This will get you pretty close  and I use it in production and have never had a collision   However  if you look at the constructor for a guid in reflector  you will see all of the checks it makes    public static bool GuidTryParse string s  out Guid result                if   String IsNullOrEmpty s   amp  amp  guidRegEx IsMatch s                         result   new Guid s               return true                     result   default Guid           return false             static Regex guidRegEx   new Regex    A-Fa-f0-9  32                                            A-Fa-f0-9  8 -  A-Fa-f0-9  4 -  3  A-Fa-f0-9  12                                                0xA-Fa-f0-9  3 10     0 1  0xA-Fa-f0-9  3 6   2    0 1      0xA-Fa-f0-9  3 4    0 1   7  0xA-Fa-f0-9  3 4         RegexOptions Compiled

User · Answer

If all you want is some very basic error checking  you could just check the length of the string                 string guidStr                     if  guidStr Length    Guid Empty ToString   Length                    Guid g   new Guid  guidStr

User · Answer

Unfortunately  there isn t a TryParse   equivalent   If you create a new instance of a System Guid and pass the string value in  you can catch the three possible exceptions it would throw if it is invalid   Those are    ArgumentNullException FormatException OverflowException   I have seen some implementations where you can do a regex on the string prior to creating the instance  if you are just trying to validate it and not create it

User · Answer

This will get you pretty close  and I use it in production and have never had a collision   However  if you look at the constructor for a guid in reflector  you will see all of the checks it makes    public static bool GuidTryParse string s  out Guid result                if   String IsNullOrEmpty s   amp  amp  guidRegEx IsMatch s                         result   new Guid s               return true                     result   default Guid           return false             static Regex guidRegEx   new Regex    A-Fa-f0-9  32                                            A-Fa-f0-9  8 -  A-Fa-f0-9  4 -  3  A-Fa-f0-9  12                                                0xA-Fa-f0-9  3 10     0 1  0xA-Fa-f0-9  3 6   2    0 1      0xA-Fa-f0-9  3 4    0 1   7  0xA-Fa-f0-9  3 4         RegexOptions Compiled

User · Answer

If all you want is some very basic error checking  you could just check the length of the string                 string guidStr                     if  guidStr Length    Guid Empty ToString   Length                    Guid g   new Guid  guidStr

User · Answer

new Guid string    You could also look at using a TypeConverter

User · Answer

Guid TryParse     https   msdn microsoft com de-de library system guid tryparse v vs 110  aspx  or   Guid TryParseExact     https   msdn microsoft com de-de library system guid tryparseexact v vs 110  aspx  in  NET 4 0  or 3 5

User · Answer

use code like this   new Guid  9D2B0228-4D0D-4C23-8B49-01A698857709     instead of  9D2B0228-4D0D-4C23-8B49-01A698857709  you can set your string value

User · Answer

Guid TryParse     https   msdn microsoft com de-de library system guid tryparse v vs 110  aspx  or   Guid TryParseExact     https   msdn microsoft com de-de library system guid tryparseexact v vs 110  aspx  in  NET 4 0  or 3 5

User · Answer

new Guid string    You could also look at using a TypeConverter

User · Answer

Unfortunately  there isn t a TryParse   equivalent   If you create a new instance of a System Guid and pass the string value in  you can catch the three possible exceptions it would throw if it is invalid   Those are    ArgumentNullException FormatException OverflowException   I have seen some implementations where you can do a regex on the string prior to creating the instance  if you are just trying to validate it and not create it

User · Answer

new Guid string    You could also look at using a TypeConverter

[c#] How to try convert a string to a Guid

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