Re: passing data between forms - C# Discussion Boards

31-Aug-12 8:53

Hi,

I have a dll class and from here I am calling a form. I am able to send data from the dll class to the form. But how I am going to get data back from the form to the dll class? I wsed the same code but it is not working backward.

frmLogin login = new frmLogin();
           
            login.Type = type;
            login.Username = username;
            login.Password = password;
            login.Group = group;
            
            login.ShowDialog();

Thanks in advance,
Sai

Richard Andrew x6431-Aug-12 9:18

Richard Andrew x64

31-Aug-12 9:18

Why can't you simply reverse the assignments you have?

login.ShowDialog();

username = login.Username;
password = login.Password;

etc....

The difficult we do right away...
...the impossible takes slightly longer.

OriginalGriff31-Aug-12 9:21

OriginalGriff

31-Aug-12 9:21

Create a property (or several) in the Form and read it back from the instance once ShowDialog returns - it won't until the user closes the form, so read the data at that point.

frmLogin login = new frmLogin();
login.Type = type;
login.Username = username;
login.Password = password;
login.Group = group;

login.ShowDialog();

type = login.Type;
username = login.Username;
password = login.Password;
group = login.Group;

Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water

mamoony31-Aug-12 10:08

31-Aug-12 10:08

What I did....
In Class 1

if (login.ShowDialog()== DialogResult.OK)
            {
                ans= login.Result;
            }

In form 1

public int Result
       {
           get;
           set;
       }

Result = value;
            this.DialogResult = DialogResult.OK;

Thnks a lot all,
Sai

OriginalGriff31-Aug-12 21:09

OriginalGriff

31-Aug-12 21:09

That'll do it!
Nice one - well done.

Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water

BillWoodruff3-Sep-12 15:59

BillWoodruff

3-Sep-12 15:59

I can't make any connection between the code you show here, and any other post on this thread:

This code is not going to compile:

1. the variable 'ans is never declared, or used, just assigned to; will not compile.

2. the variable 'value is never declared: Result = value; will not compile.

3. the statement: "this.DialogResult = DialogResult.OK;" makes no sense unless you have a Form1 scoped variable with the name 'DialogResult declared, and, you should not use variable names identical to Operator names since that way lies utter code confusion. And why would you need a Form1 scoped variable of this type in the first place ?

This is a case where posting code-fragments means no meaningful response is possible.

best, Bill

"If you shoot at mimes, should you use a silencer ?" Stephen Wright

mamoony10-Sep-12 10:06

10-Sep-12 10:06

It compiled and worked.

Thanks,
Sai

Delete From XML File

Kevin Marois31-Aug-12 8:47

Kevin Marois

31-Aug-12 8:47

I have this XML file

<?xml version="1.0" encoding="utf-8"?>
<Contacts>
  <Contact>
    <ContactId>0</ContactId>
    <Prefix>
    </Prefix>
    <FirstName>Kevin</FirstName>
    <MiddleName>Marois</MiddleName>
    <LastName>Brian</LastName>
    <Suffix>
    </Suffix>
    <Birthday>1965-10-11</Birthday>
    <Title>Senior Software Engineer</Title>
    <Comments>has 25 years of development experience</Comments>
  </Contact>
  <Contact>
    <ContactId>1</ContactId>
    <Prefix>Dr.</Prefix>
    <FirstName>Henry</FirstName>
    <MiddleName>DeCarlo</MiddleName>
    <LastName>G</LastName>
    <Suffix>III</Suffix>
    <Birthday>1965-10-11</Birthday>
    <Title>Oral Surgeon</Title>
    <Comments>His office is over on 23rd street</Comments>
  </Contact>
  <Contact>
    <ContactId>2</ContactId>
    <Prefix>
    </Prefix>
    <FirstName>Mattew</FirstName>
    <MiddleName>Damon</MiddleName>
    <LastName>Paige </LastName>
    <Suffix>
    </Suffix>
    <Birthday>1970-10-08</Birthday>
    <Title>Actor</Title>
    <Comments>Excellent actor</Comments>
  </Contact>
</Contacts>

I want to delete a contact using the ContactId. So far I have this:

public void DeleteContact(int ContactId)
{
    ensureFileExists();
    XmlDocument doc = new XmlDocument();
    doc.Load(XMLFile);
    var path = "/contacts/contact[ContactId=" + ContactId + "]";
    XmlNode node = doc.SelectSingleNode(path);
    node.ParentNode.RemoveChild(node);  

    doc.Save(XMLFile);
}

But the node is coming back null. How do I delete the contact? What's wrong here?

Thanks

If it's not broken, fix it until it is

PIEBALDconsult31-Aug-12 9:40

PIEBALDconsult

31-Aug-12 9:40

Ahem... case sensitivity... Java | [Coffee]

Kevin Marois31-Aug-12 9:52

Kevin Marois

31-Aug-12 9:52

That did it. Thanks

If it's not broken, fix it until it is

PIEBALDconsult31-Aug-12 11:20

PIEBALDconsult

31-Aug-12 11:20

And if that's your actual date of birth, then you're about two months older than me. Jig | [Dance]

To show the properties page of a file and navigate to a tab

AmitGajjar31-Aug-12 23:27

AmitGajjar

31-Aug-12 23:27

you catch it quickly so 5+

Thanks
-Amit Gajjar (MinterProject)

John T.Emmatty31-Aug-12 4:03

John T.Emmatty

31-Aug-12 4:03

In my software i need to show the property dialog of a file and navigate to a specific tab in that property dialog? please tell me how to acheive this using c#?

or Is it possible to replace the default property dialog with a custom one?

Re: To show the properties page of a file and navigate to a tab

Shameel31-Aug-12 4:56

Shameel

31-Aug-12 4:56

Use the ShellExecuteEx Win32 API to achieve this.

using System.Runtime.InteropServices;

[DllImport("shell32.dll", CharSet = CharSet.Auto)]
static extern bool ShellExecuteEx(ref SHELLEXECUTEINFO lpExecInfo);

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public struct SHELLEXECUTEINFO
{
    public int cbSize;
    public uint fMask;
    public IntPtr hwnd;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string lpVerb;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string lpFile;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string lpParameters;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string lpDirectory;
    public int nShow;
    public IntPtr hInstApp;
    public IntPtr lpIDList;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string lpClass;
    public IntPtr hkeyClass;
    public uint dwHotKey;
    public IntPtr hIcon;
    public IntPtr hProcess;
}

private const int SW_SHOW = 5;
private const uint SEE_MASK_INVOKEIDLIST = 12;
public bool ShowFilePropertiesDialog(string fileName)
{
    SHELLEXECUTEINFO info = new SHELLEXECUTEINFO();
    info.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(info);
    info.lpFile = fileName;
    info.lpVerb = "properties";
    info.fMask = SEE_MASK_INVOKEIDLIST;
    info.nShow = SW_SHOW;
    return ShellExecuteEx(ref info);
}

And then use the method like this:

ShowFilePropertiesDialog(@"C:\hello.txt");

Re: To show the properties page of a file and navigate to a tab

John T.Emmatty31-Aug-12 5:08

John T.Emmatty

31-Aug-12 5:08

Thanks.but this would only display the property dialog, i need a way to navigate into one of tabs inside the property dialog.

Re: To show the properties page of a file and navigate to a tab

Shameel31-Aug-12 5:11

Shameel

31-Aug-12 5:11

How about using SendKeys[^] to send as many Control+Tab characters as required?

.Net C# GUI dll will use in VB6 (Not user control)

mamoony31-Aug-12 3:52

Re: .Net C# GUI dll will use in VB6 (Not user control)

31-Aug-12 3:52

Hi,

I want to create a .Net Dll in c# which will have a GUI. I need to use this in a VB6 application. Is this possible?

I know how to create a class dll in C# and use it in VB6 also I can create an User Control in C# and used it in VB6 form.

What I want is the VB6 will call a dll (login screen) and the C# GUI will run and give back a yes/no result.

Thanks,
Sai

Shameel31-Aug-12 4:47

Shameel

31-Aug-12 4:47

This[^] article discusses using .NET user control in VB6.

Re: .Net C# GUI dll will use in VB6 (Not user control)

mamoony31-Aug-12 7:59