.net - Convert Session To Guid?
Jun 28, 2011
I am building a User Management section to a website CMS.The user has a list of users and then clicks the edit button, the system then stored the UserId in a session and goes to the editUser.aspx page which will show the users details.To get the users details I need to convert the UserId session to a Guid so i can get user details.
I keep getting error message:
System.InvalidCastException: Specified cast is not valid.
Dim selectedUserId As Guid = CType(Session("strUserId"), Guid)
Dim mu As MembershipUser = Membership.GetUser(selectedUserId)
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Jan 12, 2010
Here's the basic premise though: I need to convert a GUID-like string to a different format as shown in these examples:
Original String:
{291B3A3B-F808-45B8-8113-DF232FCB6C82}
Converted String
B3A3B192808F8B541831FD32F2BCC628
[Code].....
It works, but it doesnt seem very well written... Oh and if you are wondering why I wrote my own ReverseString method rather than just using the Reverse extension method on the String class - It seems to return a collection of chars rather than a string (god knows why) and I couldnt find any easy/obvious way to convert this collection of chars back to a string (I thought just CStr would do it but apparently not)
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Feb 26, 2012
im workin on a task that will get the current computers Default Gatway, So i chose the easiest option, using the Registry, in most cases i find this with no problem at all, here's the code im using right now,
Public sHost As String = My.Computer.Registry.GetValue _
("HKEY_LOCAL_MACHINESYSTEMControlSet001servicesTcpipParametersInterfaces THE GUID NEEDED HERE ", "DhcpServer", Nothing)
Which works fine, if i put My GUID in where i've stated in above code, I get the right value ect..., no what i was woundering is how would i get the program to preform this task on another Computer as their GUID will be diffrent, if their away i can do this with simplicity?
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Dec 8, 2011
I am storing a session variable that a user types into a textbox. With their valid input, their session gets created and they get a little more functionality than the regular end users of the site.I was wondering if it is possible to find a way to add someone's session variable to the end of a URL. This way we can email a link to one of our clients, they click it, and their session has automatically begun. They already have the textbox to enter their code into, but I was told that it would be much easier for the users to just click a link that will start their session.
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May 28, 2009
On startup of my software which i developed in vb.net, it connects to mssql server. I want to have session id or session number of the connection with mssql. I'm sure it is unique number and i want to use this session in my software for different purposes. My question is
1. is there anything like session id or session unique number when you connection mssql server
2. if yes to 1 then how i can get it in vb
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Jan 8, 2010
Is GUID really unique? I have a webservice that the client application connects to, which generates a GUID. I know GUID are generated using the mac adress of the NIC. Is the NIC in the webservice server used or the client NIC?
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Aug 27, 2011
I need to specify a GUID for each event declared in my class, to be able to generate a manifest for it.
Right now i'm decorating the class with the following:
ComClass("AB849263-E1F7-466B-9BAC-828E67F2871D", "EB2AB5A4-D3AD-4C01-81FB-A73AB0B3848C", "6623B1F2-2D4E-4974-AE51-369F65D47F69")
However when i use the MT tool to generate the manifest, i'm greeted with : "mt.exe : genman warning G81010014: Explicit guid not defined for type NetTest.NetClass+TestEventHandler."
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Nov 9, 2011
I have an external database that is feeding information to me. One saves their data as native GUID format and my other data source supplies standard .NET GUID format string. Is there a tidy way to convert from Native GUID to GUID Structure? Also is there any validation bit to determine if a provided value is a Native GUID or not? I can't seem to find any if there is one. The difference is as follows:
typedef struct _GUID
{
DWORD Data1;
WORD Data2;
WORD Data3;
BYTE Data4[8];
} GUID;
Data1, Data2 and Data3 get their byte order reversed but Data4 remains the same, see [url] for more info.
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Nov 29, 2010
I have multiple applications that will be calling a DLL.Is there a way to get the GUID from the calling application without passing it?I would like to use the GUID to verify the parent application and open up rights within the DLL for a specific app but not others.
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Oct 1, 2010
Now i am doing a vb.net desktop application, In which i have to construct GUID. Eventhough having a built-in function in our VB.NET like "System.Guid.NewGuid.ToString()" to get GUID, I need to create the GUID in 30 digits in the below mentioned criteria through vb.net.
Application constructs the GUID (30 digits) using the information from the 5 different sources. The different sources are Current system time, millisecond of the system time, Process ID for the application, system physical memory status and finally the group object identifier number.
8 digits
4 digits 8 digits
8 digits 2 digits
[Code]....
I am not sure how to get the above values to construct the GUID?
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May 28, 2010
We have a .NET app that needs to examine a folder that may contain COM libraries (DLL and OCX.) When we do encounter a COM library one thing we need to accomplish is to extract the GUID from the COM DLL or OCX.Is there a straightforward way to do this with .NET without using 3rd party libraries?
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Jun 22, 2010
I'm calling a GUID with a system function and trying to insert it into a database as a primary key. i'm using vb 2010 .net framework with sqlce server making my datatables. the column is AutoNumber which i set up to be a uniqueidentifier. the length is not adjustable and set at 16. i got all kinds of not parsing query errors. i've edited the insert statement a bunch trying to figure this out. i've went so far as changing the table schema of AutoNumber to be just a nvarchar with length of 100. it's something to do with how i'm inserting the GUID. in the code below i'm converting it into a string then inserting it into my table. is this wrong?? i've tried finding other ways of doing it but it's a little confusing. everything else in the code works perfectly it's just this part that is keeping me from completion.[code]...
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Feb 10, 2011
I'm creating a web project for one of my uni modules using Visual studio 2010. I'm using asp.net membership and have all of my sql-server tables set up correctly (I'm pretty sure).I have a form that I have created myself that inserts into the database using sqlDataSource.insert(). I had some problems initially with not being able to insert any data into the table at all, but I have cleared that up.My problem now is that I need to insert the currently logged in user's userID into one of the columns of the table. But every time I hit the submit button, I am told I cannot insert null values in the userID column.
I can retrieve the userID using this snippet:
Dim userID As String
Dim memUser As MembershipUser
[code].....
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Jun 2, 2010
First off, apologies, I am probably diving in a bit too deep with this one. I am trying to find the current version of the drivers in my machine. I have a list of the GUIDs and friendly names by using the following code:
[Code]...
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Apr 26, 2010
I would like to select a record from my table based on a GUID using the following approach:
dim rows() as MyDataSet.MyTableRow = dataset.MyTable.Select("id = " & Guid.NewGuid.ToString)
but I get the following exception:
System.Data.EvaluateException was unhandled
Message="Cannot perform '=' operation on System.Guid and System.Int32.
What is the best way to select a record based on a GUID using vbasic.net from MS Sql Server?
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Mar 21, 2012
I'm using a certain regex to know where there a certain string values in a string:
Regex: C[([A-Z][0-9])]
String: =C[C3]+(C[C3]-C[C5])*(C[C3]-(C[C5]+C[C3]))
This gets every C[blabla] value out of that string and when I ask for group(1), I don't even have to cut of the "C[" at the start and the "]" at the end.Now I want to do this but instead of using the C[] placeholder, I'm using G[] and so not a "C3" like string in that placeholder, but a guid so I get these:
Regex: G[[{|(]?[0-9a-fA-F]{8}-([0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}[)|}]?]
String: =Guid[92716d13-01d1-447b-be3f-c090fed6336c]+Guid[92716d13-01d1-447b-be3f-c090fed6336c]
When I check the regex, it matches a guid perfectly, but I don't get any matches when I use more than just one guid (or when I add characters before or after).I left out the "^$" so it doesn't define a start and end anymore, but that didn't seem to be the problem.
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Jul 25, 2010
I've been checking endlessly on MSDN and the net in general trying to find out how to get the computer's "C:" drive serial number and also the GUID.Everything I've found seems to pointing to the System.Management library using the ManagementObject, but "ManagementObject" doesn't appear to be recognized by the IDE?!I've imported: System.Management, System.Management.Instrumentation, Microsoft.Win32 and System.IO, but ManagementObject is still coming up as an error.I'm aware I can simply access the registry to get the GUID, but can anyone simply give me the code to access these 2 elements please.
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Dec 16, 2009
I want to do something like this:
Dim selectedCourses As List(Of Guid) =
From item In chkListCourses.Items Where item.Selected =
True Select item.Value
But I get the error:
Unable to cast object of type
'WhereSelectEnumerableIterator2[System.Object,System.Object]'
to type
'System.Collections.Generic.List1[System.Guid]'.
The value of item is a string representation of a Guid. I'd also like the syntax for a Lambda expression.
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Dec 6, 2011
I am using Fluent NHibernate to map an Oracle database. It is a legacy database so I cant really change everything I want.There is a GUID field, but the keys are still composite (I will change this as soon as I can so that the keys are not composite, but I cant do it right now). The GUID is a VARCHAR2 field with this layout: 551608b1-275d-49f6-9561-44d01aacf23f. The GUID is not added by a sequence in Oracle, but inserted from code (C# or VB.net)[code]Is the problem that I dont use a sequence to generate my GUID? How can I overcome this?
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Jan 6, 2010
The GUID is the SelectedValue of a ComboBox (cbNetwork) If I execute a Debug.Print on the cbNetwork.SelectedValue, I see:
645b9d20-23eb-469e-9faa-e287600a54f3
However, when I try to execute the Fill method of the DataTableAdapter, I get an error "Specified cast is not valid."
[code].....
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Aug 6, 2011
I am building a permissions system in vb.net against the normal Windows Server file system. Have not decided on the best method, but is there a way to get access to some kind of internal GUID that Windows might store for a folder. If I just store the path for security, then it quickly becomes very hard to update a database storing path information to get security information. If a folder had some kind of internal GUID structure that would be great. Is this available?
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Apr 20, 2011
I've got a problem in one of my SQL queries, the type GUID can't be used with the operator & (obviously from the title). Here's the few lines of code which I'm using:
Dim ClientsAssetID As Guid = New Guid(ClientsAssetIDTextBox.Text)
Dim Client1 As Guid = New Guid(Client1TextBox.Text)
Dim Client2 As Guid = New Guid(Client2TextBox.Text)
[code]....
ClientsAsset, Client1, Client2 and Client3 are all of type GUID, but are entered into the textboxes as strings, are converted to guid and then should all go smoothly into the query, but it's having a problem with linking everything together. The error I'm
getting is "Operator '&' is not defined for types 'String' and 'System.Guid'.How do I fix this? I've tried a few different things, such as using Ctype in the query, but they have also circled back to this error.
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Aug 30, 2011
API Declarations
<DllImport("oleacc.dll")> _
Shared Function ObjectFromLresult (ByVal lResult As IntPtr, <MarshalAs(UnmanagedType.LPStruct)> ByVal refiid As Guid, ByVal wParam As IntPtr) As <MarshalAs(UnmanagedType.Interface)> Object
End Function
[CODE]...............
When I go to extract the GUID with ObjectFromLresultAccessviolationException not occurred at the Management 'attempt to read or write protected memory. This usually means that other memory is corrupt. What does the way in here to deal with ObjectFromLresult the API to be successful extraction GUID.
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Nov 1, 2011
[code]...
What would be wrong in the above code. ExecuteReader is throwing excepion. Invalid cast from string to GUID. But My Sqlparamter was already uniqueidentifier nothing cast.[code]...
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Jun 25, 2010
I am using GUID for uniqueness (Guid.NewGuid.ToString), but while getting data from database some time GUID order is mixedup.
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Feb 25, 2011
I'm trying to use a GUID to generate 6 random alphanumeric characters (just letters and number). Is there a way to change the format of a GUID before it is generated. Or must I generate the GUID in its standard format and then manipulate it.
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Jun 22, 2010
I have a problem with Operator '&' someone may with this problem.
[Code]...
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Jul 13, 2010
I have a SQL database that is different than the one in ASP.net so I had to create a custom membership Provider. The provider to get the user looks like this:My SQL class name is CustomSqlProvider:
Public Overrides Function GetUser(ByVal username As String, _
ByVal userIsOnline As Boolean) As MembershipUser
'Dim connectionString As String = "Server=***;Database=***;User Id=***password=****"'
[code]....
After adding those gets and sets and assigning parameter variables to my Sproc parameters I get the following error: "Reference not set to an instance of an object." at this line of code:
Dim currentUser As MembershipUser = Membership.GetUser()
Dim UserId As Guid = CType(currentUser.ProviderUserKey, Guid)
And this is what I have on the UserInfo.aspx.vb Page under the Button click:
Dim sql As New SqlClient.SqlCommand("Update_User", con)
sql.Parameters.Add("@UserId", SqlDbType.UniqueIdentifier).Value = UserId
sql.Parameters.Add("@UserName", SqlDbType.NVarChar).Value = txtUserName.Text
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Jan 16, 2012
I'm trying to check if a variable has been defined as a nullable Guid. eg.
Dim myGuid As Nullable(Of Guid) or Dim myGuid As Guid?
It seems doing a myGuid.GetType returns the underlying type, that is type Guid, not Guid?. So testing myGuid.GetType Is GetType(Guid?) always returns False.How do I find out if myGuid is a nullable type?
Ed: I can do the following, which correctly returns True for "Guid?" and False for "Guid":
Not Nullable.GetUnderlyingType(GetType(Guid?)) Is Nothing
The problem is that I don't know how to retrieve the nullable type from the variable itself, in order to test it. I've only been able to get the underlying (non-nullable) system type.
I've written a db helper function. I pass it an object comprised of public members, representing the row data of a table. The members are the table columns.Using reflection, I loop through these public members to create an INSERT statement for a command object and populate its parameters with the values in those members. So far so good.But now there's a table which has a uniqueidentifier column which I must not populate from the row object, as it defaults to "NEWID()" (using SQL Server 2008). Instead of skipping all Guid columns, which would be easy, I only want to skip ones defined in the row data class as "Guid" (non-nullable).Basically, I'm using the Guid? (Nullable) type to indicate it's ok to populate that uniqueidentifier column with data. If it's non-nullable, that tells me to skip it because the column has a NEWID() default value.
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Mar 10, 2011
I'm using Linqer to convert SQL to Linq: Update EmployeeSite SET SiteId = Null
[Code]....
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