C# Discussion Boards - CodeProject

swjam11-Jan-07 17:57

11-Jan-07 17:57

I dragged a DataGrid from the toolbox to a form. Then I created my own class MyDataGrid and derived it from a DataGrid. Now, the instance of the DataGrid class that I dragged to the form, say dataGrid1, I replaced with an instance of MyDataGrid.
So instead of having:
private System.Windows.Forms.DataGrid dataGrid1;
I have:
private MyDataGrid dataGrid1;

After making all the other necessary changes, my code compiled but when I go back to VStudio Design View, the form is not displaying.
I know there is something inherently wrong with how I did this, but what is the proper way of associating a user-defined DataGrid to a form?
I need to use my own DataGrid version because I need to override a mouse event.

Thank in advance!

I am a SysAdmin, I battle my own daemons.

Re: DataGrid

Nader Elshehabi11-Jan-07 21:48

Nader Elshehabi

11-Jan-07 21:48

ZapBranny wrote:
what is the proper way of associating a user-defined DataGrid to a form?

I wish you'd have asked this question before doing this Davinci workaround! Big Grin | :-D

Anyway. First you got to clean up your form -maybe by deleting it completely from your solution-. I don't know what else you and the designer have modified. So I believe "Better safe than sorry".
Now to your question.
1- Create a new project -whether to add it to the current solution or not is your choice-.
2- Choose Windows Control Library.
3- Now you have your user control. Switch to Code View.
4- Change the inheritance to DataGrid -or DataGridView as I would suggest. Why would you want DataGrid anymore?-.
5- Compile and you will have one error. Go to the line that causes the error and remove it:

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

6- Now when you build that project you'll get a dll file. Either reference to that dll file -after you copy it to other projects' folders-, or if your Control Library project is in the same solution you can reference to it directly using the Projects tab in the reference dialog box.

Big PS.
If you want to delete a thread in the forum. There is a link to the lower right of each message you post. Click on it and delete both the messages you posted earlier.

Regards

error in storage.InsertRecords [modified]

tahreen shah11-Jan-07 17:11

tahreen shah

11-Jan-07 17:11

hi!
i tried to embed ur code in my c#.net based windows form de code goes as follows:

namespace Reconciliation
{
///

/// Summary description for Form1.
///

public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
///

/// Required designer variable.
///

private System.ComponentModel.Container components = null;

public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();

//
// TODO: Add any constructor code after InitializeComponent call
//
}

///

/// Clean up any resources being used.
///

///

// temp class

///

///

/// <param name="disposing" />
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
///

/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
///

private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(152, 32);
this.button1.Name = "button1";
this.button1.TabIndex = 0;
this.button1.Text = "import";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(336, 266);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);

}
#endregion

///

/// The main entry point for the application.
///

[STAThread]

static void Main()
{
Application.Run(new Form1());

}

[DelimitedRecord(",")]
public class temp

{
public string aparty;
public string bparty;
public string date;
public string time;
} ///end temp

private void button1_Click(object sender, System.EventArgs e)
{
SqlServerStorage storage = new SqlServerStorage(typeof(temp));

storage.ServerName = "local";
storage.DatabaseName = "Temp tahreen";

storage.InsertSqlCallback = new InsertSqlHandler(GetInsertSqlCust);

temp[] res = storage.InsertRecords(CommonEngine.ReadFile(typeof(temp), "temp.txt")) as temp[];

}

protected string GetInsertSqlCust(object record)
{
temp obj = (temp) record;

return String.Format("INSERT INTO Temp (Aparty, Bparty, [Date], [Time]) " +
" VALUES ( '{0}' , '{1}' , '{2}' , '{3}' ); ",obj.aparty,obj.bparty,obj.date,obj.time);

}

}
}

now i get error in the line

temp[] res = storage.InsertRecords(CommonEngine.ReadFile(typeof(temp), "temp.txt")) as temp[];

and de error says:

Cannot convert type 'void' to 'Reconciliation.Form1.temp[]' via a built-in conversion

y is it so?

-- modified at 23:27 Thursday 11th January, 2007

tahreen shah

When is a DropDownItem not a DropDownItem? [modified]

JoeRip11-Jan-07 16:55

JoeRip

11-Jan-07 16:55

In my Windows.Forms app, I have a menu. That menu contains six menu items.

When the menu drops, I check a flag to see if the items in that menu should be disabled.

Here is the code:

private void miImport_DropDownOpening(object sender, EventArgs e)<br />
{<br />
foreach (ToolStripDropDownItem item in miImport.DropDownItems) item.Enabled = fMyFlag;<br />
}

This code executes flawlessly, disabling all the menu items when the flag is false.

However, once I add a separator bar between the items, this code throws the following exception:

Unable to cast object of type 'System.Windows.Forms.ToolStripSeparator' to type 'System.Windows.Forms.ToolStripDropDownItem'.

Can it possibly be true that the collection MenuItem.DropDownItems contains objects of different types? Isn't that verboten?

More importantly, why on earth would they do this? Why would any item they allow you to insert in the DropDownItem list not be treated as a DropDownItem?

This makes me pretty mad, as I'll have to write much longer code to individually disable these items.

Or am I missing something? Should I not be using "ToolStripDropDownItem" in my foreach loop?

Grr. I removed the item.Enabled = value line, and it still throws the exception. An empty foreach loop should NEVER throw an exception. If it's not an "each", why the hell is it being enumerated?

-- modified at 23:18 Thursday 11th January, 2007

Re: When is a DropDownItem not a DropDownItem?

JoeRip11-Jan-07 17:29

JoeRip

11-Jan-07 17:29

I get the idea people just wait to see how often I'll Reply to myself.

Here's the code I came up with to replace that one line of code. If anybody knows a better method - say, using a different Type than "ToolStripDropDownItem " in my foreach loop - please feel free to let me know.

private void miImport_DropDownOpening(object sender, EventArgs e)<br />
{<br />
  foreach (object item in miImport.DropDownItems)<br />
  {<br />
    Type typ = item.GetType();<br />
    if (typ == typeof(ToolStripMenuItem))<br />
    {<br />
       ToolStripMenuItem mi = (ToolStripMenuItem)item;<br />
       mi.Enabled = myFlag;<br />
    }<br />
  }<br />
}

Re: When is a DropDownItem not a DropDownItem?

ChandruIT11-Jan-07 17:37

ChandruIT

11-Jan-07 17:37

Dear Joe
I can't able to clear your prob, but the below code will solve your prob.

for (int iLcnt = 0; iLcnt < toolStripDropDownButton1.DropDownItems.Count;iLcnt++ )
toolStripDropDownButton1.DropDownItems[iLcnt].Enabled = fMyFlag;

Cheers,
Chandru.

Re: When is a DropDownItem not a DropDownItem?

JoeRip11-Jan-07 18:25

JoeRip

11-Jan-07 18:25

Thanks, Chandru. It turns out that ToolStripSeparators don't have an Enabled property, either, so either way I have to check the object type before setting the Enabled property.

How very inconvenient. And surprising, considering.

Preview Type Window (Form)

Nooie11-Jan-07 15:19

Nooie

11-Jan-07 15:19

Hi all,

I have an application that cycles through Directories and finds Duplicate Image files (By Name).

It shows the original file name (FileInfo.Name) and the possible Duplicate (FileInfo.FullName) in the a CheckedListBox container on the form

What I want to do next is create a MouseHover Event that will show a form a bit like a tooltip with a preview of both Pictures in it.

I suppose I have a few questions.

1. Is a CheckedListBox the best solution for this to show the data? As the code runs through I store them in a List<listviewitem> which I then convert to an Array and AddRange onto the container.
2. What is the best way to get the preview to come up? I want it to dissapear as the user moves from one ListItem to another. The other issue is how can I get the MouseHover event to tell me which index I am on so I can retrieve the file paths to the imagine.

Suggestions greatly appreciated, and pointing to other online info that could me also greatly appreciated.

Regards

/TH

topic for final year proj inj c#

Mri1a11-Jan-07 12:56

Mri1a

11-Jan-07 12:56

hello !!
plz do list topics for final year degree(ug) proj in c# for a beginner

MARTAND SHARDUL
B.TECH(C.S. & ENGG.)