C# Discussion Boards - CodeProject

Properties.Settings.Default.Save() does not work

Mertli Ozgur Nevres21-Jul-06 1:06

21-Jul-06 1:06

Hi all,
i am trying to change app settings in run time. I wrote the code below:

Properties.Settings.Default.ServerIP = "10.0.0.7";
Properties.Settings.Default.Save();
MessageBox.Show(
Properties.Settings.Default.ServerIP
);

It alerts "10.0.0.7" but does not save the value (default value was 10.0.0.12). And in WindowsApplication1.exe.config file, it is still 10.0.0.12. Does anyone know how can i change this value?
Thanks...

ozgur.nevres

Re: Properties.Settings.Default.Save() does not work

Mertli Ozgur Nevres21-Jul-06 1:52

Mertli Ozgur Nevres

21-Jul-06 1:52

i found the problem.
If i make any changes in my application, and build it, it re-creates the user.config file in Application Data folder with default values.
can i force the VS to re-create the file with changed values?
thanks...

ozgur.nevres

UnauthorizedAccessException

sjembek20-Jul-06 23:55

sjembek

20-Jul-06 23:55

Hi,

I'm buidling a forms application in which user settings can be stored and loaded from a file. So far so good. Now I'm trying to load a file of this type made by another user on another computer. It seems this causes some kind security problem:

System.UnauthorizedAccessException: Access to the path 'C:\dotnet\myapp\bin\Debug\settings\defaults.set' is denied.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
at System.IO.File.Open(String path, FileMode mode)

The file in question is created simply as:

Stream stream = File.Open(filename, FileMode.Create);
BinaryFormatter bFormatter = new BinaryFormatter();
// serialize some stuff
stream.Close();

Why am I getting this error and does anyone know how to solve it?

Re: UnauthorizedAccessException

leppie21-Jul-06 1:02

leppie

21-Jul-06 1:02

It most likely inherited rights from the parent folder, and got transfered somehow.

Are you using Vista btw? I have seen the same thing happen there without explaination.

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Re: UnauthorizedAccessException

sjembek21-Jul-06 1:27

sjembek

21-Jul-06 1:27

No, I'm not using Vista, but this would be a reasonable explanation: I think the user that created the file had the application installed into a folder on his desktop, which could mean the rights to his desktop stick to the file. Can anyone confirm this?

Re: UnauthorizedAccessException

leppie21-Jul-06 2:10

leppie

21-Jul-06 2:10

Definately a permission issue. If you run as Adminstrator you can take ownership and change the permissions, but else you out of luck. I doubt there will be any way to circumvent this security for a non admin user or the original creator of the file.

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Re: UnauthorizedAccessException

Vasudevan Deepak Kumar21-Jul-06 1:41

Vasudevan Deepak Kumar

21-Jul-06 1:41

Is the file readOnly?

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Re: UnauthorizedAccessException

sjembek21-Jul-06 2:06

sjembek

21-Jul-06 2:06

Nope.

namevaluecollection in user settings

Badscher20-Jul-06 23:22

Badscher

20-Jul-06 23:22

Hi,

I tried to save some information in an user.config file. I tried to save a hashtable, but it doesn't work. Thats why I tried to save an arraylist and it works. After that I would like to save a NameValueCollection, but this isn't saved like the arraylist?!?! WHY???? Confused | :confused:

[CSHARP]
public System.Collections.ArrayList Setting
{
get
{
if (mySettings == null)
mySettings = new Specifications.Settings1();

return mySettings.Table;

}
set
{
if (mySettings == null)
mySettings = new Specifications.Settings1();

mySettings.Table = value;

mySettings.Save();
}
}

public System.Collections.Specialized.NameValueCollection Setting2
{
get
{
if (mySettings == null)
mySettings = new Specifications.Settings1();

return mySettings.Table2;

}
set
{
if (mySettings == null)
mySettings = new Specifications.Settings1();

mySettings.Table2 = value;

mySettings.Save();
}
}
[/CSHARP]

Re: namevaluecollection in user settings

Badscher21-Jul-06 1:41

Badscher

21-Jul-06 1:41

As I read somewhere else, the type namevaluecollection doesn't support xml serialization. thats why it doesn't work.
Does someone know, if there is another type, which supports xml serialization and can be used like namevaluecollection?!?

Re: namevaluecollection in user settings

LongRange.Shooter21-Jul-06 4:48

LongRange.Shooter

21-Jul-06 4:48

Use the object browser to view the different classes in System.Collections to find out which collections implement ISerializable.

IsolatedStorageFile.GetStore() problem

Super Lloyd20-Jul-06 23:12

Super Lloyd

20-Jul-06 23:12

I'm trying to manually create an Isolated storage which is associated with a particular type.

IN a pseudo code like that

using System;
using System.IO.IsolatedStorage;


class AType
{
}
class ISTest
{
  public static void Main(string[] arg)
  {
    Type t = typeof(AType);
    IsolatedStorageFile isf = IsolatedStorageFile.GetStore(
      IsolatedStorageScope.Assembly | IsolatedStorageScope.User,
      null,
      t.Assembly.Evidence);
    Console.WriteLine("Done");
  }
}

That throws undecypherable error.
I try to use reflector to see what:

IsolatedStorageFile.GetUserStoreForAssembly()

does, but I was none the wiser... :-/

Any tip on how to create IsolatedStorage associated with an arbitrary assembly (given as an argument)?

Re: IsolatedStorageFile.GetStore() problem

leppie21-Jul-06 2:22

leppie

21-Jul-06 2:22

How about IsolatedStorageFile.GetUserStoreForAssembly()? Or from Reflector, remove that 't.Assembly.Evidence' bit and replace with null.

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Re: IsolatedStorageFile.GetStore() problem

Super Lloyd21-Jul-06 3:17

Super Lloyd

21-Jul-06 3:17

Not so

Because I write this code in a utility class to read / write / store configuration file.

<t>IsolatedStorageFile.GetUserStoreForAssembly() will use the assembly where this utility method is written instead of the assembly that try to save its conf file! Sigh | :sigh:

Do you see what I mean? I'm not sure to be clear...

How do i check if an object can be cast to a valid SQLDbType?

Red_Wizard_Shot_The_Food20-Jul-06 22:39

Red_Wizard_Shot_The_Food

20-Jul-06 22:39

I have a method that accepts an SQLDbType and an object.
I would like it the check if that object can be cast into the SQLDbType.
like so:

<br />
public void Thingy(SqlDbType dataType, object value)<br />
    {<br />
        if (/*CHECK value can be cast to datatype ???*/)<br />
        {<br />
           //Do this<br />
        }<br />
        else<br />
        {<br />
           //Complain<br />
        }<br />
    }<br />

How would i go about doing this ?

Thanks.

Re: How do i check if an object can be cast to a valid SQLDbType?

Robert Rohde20-Jul-06 22:46

Robert Rohde

20-Jul-06 22:46

Hi,

if (value is SqlDbType) {
   //Do this
}

Re: How do i check if an object can be cast to a valid SQLDbType?

Red_Wizard_Shot_The_Food20-Jul-06 23:24

Red_Wizard_Shot_The_Food

20-Jul-06 23:24

Thanks

,
My next questions is:
So how then would I cast it to the specific data type of dataType (passed as a method argument/parameter)?

<br />
(dataType(value))

does not seem to work

nor does

<br />
(SQLDbType.dataType(value)) <br />

Cheers.

Re: How do i check if an object can be cast to a valid SQLDbType? [modified]

Martin#20-Jul-06 23:41

Martin#

20-Jul-06 23:41

Hello,

<code>
public SqlDbType ConvertObjectToSqlDbType(object o)
{
return o as SqlDbType;
}

{
Object myobject = ????;
SqlDbType myvalue = ConvertObjectToSqlDbType(myobject)
if(myvalue!=null)
{
//Use it!
}
}

</code>

Hope that helps you.

All the best,

Martin

-- modified at 5:46 Friday 21st July, 2006

Re: How do i check if an object can be cast to a valid SQLDbType?

Robert Rohde20-Jul-06 23:52

Robert Rohde

20-Jul-06 23:52

This won't function because SqlDbType is a value type.

Re: How do i check if an object can be cast to a valid SQLDbType?

Red_Wizard_Shot_The_Food20-Jul-06 23:53

Red_Wizard_Shot_The_Food

20-Jul-06 23:53

Sorry if im not understanding what your getting at but what i want to do is pass an SQLDataType (like varchar or bigint) and an object then if the value castable to that type then cast it.

so value does not become just SQLDbType it becomes SQLDbType.bigint if the values passed where like so:

myMethod(SQLDataType.bigint, "400893");

or a varchar if you did this:

myMethod(SQLDataType.varchar, "ScoobyDoo");

I hope that makes sence (and is possible??)

Thanks again.

Re: How do i check if an object can be cast to a valid SQLDbType?

Robert Rohde20-Jul-06 23:54

Robert Rohde

20-Jul-06 23:54

If you have checked whether value is really of type SqlDbtype the following is safe to use:

SqlDbType type = (SqlDbType)value;

Re: How do i check if an object can be cast to a valid SQLDbType?

Red_Wizard_Shot_The_Food21-Jul-06 0:00

Red_Wizard_Shot_The_Food

21-Jul-06 0:00

Robert Rohde wrote:
If you have checked whether value is really of type SqlDbtype the following is safe to use:

SqlDbType type = (SqlDbType)value;

Sorry if im getting the wrong end of the stick here...

But that code looks like is alters the value of type to = the value of value cast to an SQLDbType.

What I'm after is value to be cast from an object to the SQLDbType described by dataDype in the argument.

Or is that what it does do and I'm just misunderstanding the code.

-- modified at 6:02 Friday 21st July, 2006

Re: How do i check if an object can be cast to a valid SQLDbType?

Robert Rohde21-Jul-06 0:21

Robert Rohde

21-Jul-06 0:21

No I don't get what you try to do Smile | :)

.
The dataType parameter isn't a Type. Its a concrete value which is one of the values of the SqlDbType enumeration. What do you want to do with the object after being 'casted'. Probably then I understand what you actually are trying to do...

Re: How do i check if an object can be cast to a valid SQLDbType?

Red_Wizard_Shot_The_Food21-Jul-06 0:29

Red_Wizard_Shot_The_Food

21-Jul-06 0:29

Here is a more fleshed out version... its part of an SQL "helper" type class this method is for adding parameters:

public void AddParameter(string name, SqlDbType dataType, object value)
{
if (name[0] != '@')
name.Insert(0,"@");

_SQLcmd.Parameters.Add(new SqlParameter(name, dataType));
_SQLcmd.Parameters[name].Value = value;
}

This works (well it compiles) but I want an IF clause in there so it only tries the last 2 lines IF the "value" object is castable to the SQLDbType defined by dataType.

Hope that helps.

And thanks again.

Re: How do i check if an object can be cast to a valid SQLDbType?

Robert Rohde21-Jul-06 1:11

Robert Rohde

21-Jul-06 1:11

Hi again,

ok now I understand. I think you will have to make a swtich and test it for each type separately. At least I don't know any other way to do it.
You should also correct your Insert call:

if (name[0] != '@')
   name = name.Insert(0,"@");

Insert doesn't change the instance name (because string is immutable) but returns a new instance.

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