How to convert string to Guid

Question

I have a string variable which is receiving a Guid. I need to convert this string back to Guid as the database field is of type Guid.

I tried using:

Guid myGuid = Guid.Empty;;
myGuid = Guid.Parse(myId);

But keep getting Format Exception; Guid should contain 32 digits with 4 dashes (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx).

Below is my code:

 public string addVehicleDetails(string vname, string vtype, string regNumber, string ftype, string fefficiency, string insby, DateTime datecreated, string myId)
        {

            string result = string.Empty;
            tblVehicleDetail myVehicleDetails = new tblVehicleDetail();
          //  Guid myGuid = Guid.Empty;
            System.Guid myGuid = new Guid(myId);
           // myGuid = Guid.Parse(myId);
            try {

               // Add details into vehicle details
                myVehicleDetails.VehicleName = vname;
                myVehicleDetails.VehicleType = vtype;
                myVehicleDetails.RegistrationNumber = regNumber;
                myVehicleDetails.FuelType = ftype;
                myVehicleDetails.FuelEfficiency = fefficiency;
                myVehicleDetails.InsuranceBy = insby;

                myVehicleDetails.DateCreated = datecreated;
                myVehicleDetails.Guid = myGuid;

                dc.tblVehicleDetails.InsertOnSubmit(myVehicleDetails);

                dc.SubmitChanges();

                return result = vname;

            }
            catch(Exception exp)
            {
                exp.ToString();
                return result = "Error in Adding Vehicle Details.";
            }
        }

Any solution for this?

Please show examples and code, because `Guid.Parse` does exactly what you want. There seems to be a different problem. — germi, Dec 16 '13 at 08:07
did you check http://stackoverflow.com/questions/350500/how-to-convert-a-string-to-a-guid — mihai, Dec 16 '13 at 08:10
Please post examples of myId. what are the values you try to parse? — Boas Enkler, Dec 16 '13 at 08:10
@Trupti Can you provide code where you are converting `Guid` to string or string value . — Suraj Singh, Dec 16 '13 at 08:17
This question in already here http://stackoverflow.com/questions/104850/c-test-if-string-is-a-guid-without-throwing-exceptions and http://stackoverflow.com/questions/350500/how-to-convert-a-string-to-a-guid — Vignesh Kumar A, Dec 16 '13 at 08:26
@Trupti If you can just show your string which is causing error ? — Suraj Singh, Dec 16 '13 at 09:01

Suraj Singh · Accepted Answer · 2013-12-16T08:58:40.913

0

This Format Exception tells you that your input(String myId) is not in a recognized format.

You should handle exceptions clearly your input string format is incorrect so use Guid.TryParse(This method returns false if input is null or not in a recognized format, and does not throw an exception.) . Here.

Also check for Guid.TryParseExact method .

  myGuid = Guid.Parse(myId); 
  if (Guid.TryParse(myId, out newGuid))
    {
     try 
      { 
       myVehicleDetails.DateCreated = datecreated; 
       myVehicleDetails.Guid = myGuid; 
       dc.tblVehicleDetails.InsertOnSubmit(myVehicleDetails); 
       dc.SubmitChanges(); 
       } 
     }
     else
      {
        //Input string is not in correct format
      }

edited Dec 16 '13 at 08:58

answered Dec 16 '13 at 08:51

Suraj Singh

4,041
1
21
36

after trying this i could execute else block i.e input string was not in correct format – Trupti Dec 16 '13 at 09:20
@Trupti You should check your input string format, Go through this you can specify format of input parameter in your case your `myID` http://msdn.microsoft.com/en-us/library/system.guid.tryparseexact.aspx – Suraj Singh Dec 16 '13 at 09:30
actually while getting the string it is coming with slashes like "\"********-****-****-****-************\"" may be because of that i am facing the problem – Trupti Dec 16 '13 at 10:43
@Trupti Please post your code where you are initializing your `Guid` and converting it to string . and please post your string value.Otherwise it's just a wild-goose chase. – Suraj Singh Dec 16 '13 at 10:54
okkk ... i could find what was going wrong ..it was because of those slashes ...once i remove those slashes i can get the output properly. this code is correct to convert string to Guid myGuid = Guid.Parse(myId); – Trupti Dec 17 '13 at 05:14

How to convert string to Guid

1 Answers1