Cast string as Guid using LinqPad

Question

When I run following in the LinqPad

var ProductIds = from p in Products 
where p.Id = "F1FE990C-4525-4BFE-9E2C-A7AFFF0DDA1F"
select p;

ProductIds.Dump();

it gives me

Cannot implicitly convert type 'string' to 'System.Guid'

I just don't know how to apply proper cast it to GUid I guess

score 35 · Accepted Answer · answered Nov 09 '11 at 15:53

35

Try using the Guid.Parse(string guid) static method.

var ProductIds = from p in Products 
where p.Id == Guid.Parse("F1FE990C-4525-4BFE-9E2C-A7AFFF0DDA1F")
select p;

ProductIds.Dump();

answered Nov 09 '11 at 15:53

Nathan Anderson

Already tried it but that give me "Cannot implicitly convert type 'System.Guid' to 'bool'" error – Silverlight Student Nov 09 '11 at 15:53
Make sure you have `==` between the comparison of p.Id and your `Guid.Parse()` statements, not a single `=`. – Nathan Anderson Nov 09 '11 at 15:57
:) i must be drunk. Thanks Dude – Silverlight Student Nov 09 '11 at 15:58
@NathanAnderson Using LinqPad I am getting an error: `'System.Guid' does not contain a definition for 'Parse'` – Ravi Ram Oct 28 '14 at 19:08
Try using the constructor that takes a string as an argument. http://msdn.microsoft.com/en-us/library/96ff78dc%28v=vs.110%29.aspx – Nathan Anderson Oct 29 '14 at 17:08

score 1 · Answer 2 · answered Nov 09 '11 at 15:55

1

You currently have an assignment, but you want to use a comparison - use == instead of = :

var ProductIds = from p in Products 
                 where p.Id == Guid.Parse("F1FE990C-4525-4BFE-9E2C-A7AFFF0DDA1F")
                 select p;

answered Nov 09 '11 at 15:55

BrokenGlass

score 0 · Answer 3 · answered Jun 15 '15 at 19:03

0

You can also set a variable using:

Guid guid = new Guid ("F1FE990C-4525-4BFE-9E2C-A7AFFF0DDA1F");

Then

var ProductIds = from p in Products
where p.Id == guid
select p;

ProductIds.Dump();

answered Jun 15 '15 at 19:03

Ravi Ram

score 0 · Answer 4 · answered Nov 09 '11 at 15:53

0

You cannot cast it, you have to parse it like that:

where p.Id = Guid.Parse("F1FE990C-4525-4BFE-9E2C-A7AFFF0DDA1F");

answered Nov 09 '11 at 15:53

Fischermaen

Please see my response to @Nathan comment – Silverlight Student Nov 09 '11 at 15:55
So try `Guid.Parse("F1FE990C-4525-4BFE-9E2C-A7AFFF0DDA1F").CompareTo(p.Id) = 0` – Fischermaen Nov 09 '11 at 16:01
1

Sorry for the trouble. I guess I have drinking problem :) – Silverlight Student Nov 09 '11 at 16:02

4 Answers4