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I never said the forms have to know about the main form. In my code snippet the Type of the main form is only used to get the namespace in which the icon is found. It's only a type reference and does not instantiate the form at all. You should read the Icon constructor documentation for more information.
Microsoft MVP, Visual C#
My Articles
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Well, I've run out of things to try, so I figured I would ask here.
I've got a custom control I've been working on, but I've run into a problem. I've been able to implement design time support with a custom property editor. Everything looks fine until run-time. At run-time, the data entered at design-time doesn't show up at all.
But, the data shows up in the control perfectly at design-time. So, what's the deal?
I used Eric White's example in GDI+ Programming: Creating Custom Controls using C# Chapter 12 to create the custom modal property editor. I really don't see any difference from what I've implemented and what he has.
Any insight as to why this is happening would be greatly appreciated.
Thanks,
Zach
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It's possible that the design-time serializer isn't capturing the property code correctly. See the documentation for the DesignerSerializationVisibilityAttribute class in the .NET Framework SDK for more information about how the property can be serialized to code.
Microsoft MVP, Visual C#
My Articles
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Thanks Heath. I think that helped me figure out what the problem is (I hope so, anyways  . I think it has to do with Visual Studio .Net not knowing how to turn the design-time added properties into code. But, I'm still trying to figure out how it should be fixed.
So far, I've been using a struct that contains a linked list. Each node in the linked list contains the properties for each item in the listbox(i.e. title, subtitle, theme, image, etc).
However, my instance descriptor looks like this:
return new InstanceDescriptor(typeof(Items).GetConstructor(new Type[1]{typeof(List)}), new List[1]{ myitems.itemList});
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how do i get operating system's language?
Orcun Colak
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Use CultureInfo.CurrentCulture to get what language is set in the regional options (for formatting dates, times, and numbers). Use CultureInfo.CurrentUICulture to get the current language pack installed and in use. The CLR sets this automatically when the application is started, but you can also set the similarily named properties on the Thread class to override the default regional and language options.
Microsoft MVP, Visual C#
My Articles
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My best guess is that C# was designed this way on purpose... with garbage collection in mind, but here's the problem.
I have a dataSet that I initialize with XML data. Let's call it ds. I then load the ds into a dataGrid (dg). However, I want to modify the appearence of the data first. So here is what I have done:
<br />
<br />
<br />
public void BindDataGrid()<br />
{<br />
DataSet temp = ds;<br />
<br />
temp.AcceptChanges();<br />
dg.DataSource = ds;<br />
dg.DataBind();<br />
}<br />
The DataGrid looks good, but it turns out that temp was apparently just a pointer to ds because ds also reflects the changes I made to temp? How do I create and use a temporary dataset without modifing the original?
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Use Clone to copy the structure of the DataSet, but not the data. Use Copy to copy both the struct and the data. This is documented in the .NET Framework SDK for the DataSet class.
In .NET, there are no pointers, but references for reference types. Assigning a new variable an instance of an object makes that variable reference the original object. Value types work differently, however. Value types are structs, primatives (which are reflected by structs), and enumerations. Passing a value type as a parameter is always pass by value, unless you use the out or ref keywords. This is important to understand with object-oriented frameworks like .NET and Java.
Microsoft MVP, Visual C#
My Articles
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Well!
You could copy the dataset into temp:
DataSet temp = ds.Copy();
.NET almost always creates references to objects while "copying them", so there's a unique object in memory with lots of references to it, thats what you created with temp = ds.
Anfernius
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Any time you do an operation
a = b;
your are creating a pointer basicall making two references to a single object. An object is created in the heap, b has reference to that object, and a now has reference to that same object. It is more the rules of objects rather than a way it is done in C#.
To get a copy of the object depends on how the object is implemented. Now opening the Object Browser and searching for DataSet, when I select it I see that the Dataset object exposes ICloneable by the presence of the Clone() method.
So what you need to do is this:
a = b.Clone();
This will give you an independant clone of the object (without data as documented in the Object Browser) and allow you to change it to your hearts' content without impacting what you place in the datagrid.
Or you can do a = b.Copy() which will copy the structure and the data (as document in the Object Browser).
The object browser will give you quite alot of information on the various classes within the framework. You can run the Object Browser from the View menu option in Visual Studio. Use the binoculars icon to search for DataSet and then select the various methods to get a description of what they will do for you.
Enjoy.
______________________________
The Tao gave birth to machine language.
Machine language gave birth to the assembler.
The assembler gave birth to ten thousand languages.
Each language has its purpose, however humble.
Each language expresses the Yin and Yang of software.
Each language has its place within the Tao.
Beauty exists because we give a name to C#.
Bad exists because we give a name to COBOL.
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I've got a class that has a Color property.
class MyClass
{
public Color Color
{
get {return color;}
set
{
color = value;
.... some other processing here ....
}
}
.... some other properties and stuff here ....
}All other members of the class serialize correctly into XML, but all I get for the Color property is a <Color /> tag output. Presumably the Color struct just doesn't serialize of it's own accord, so does anyone know a tidy way to XMLize the Color correctly?
Joel Holdsworth
Wanna give me a job over the summer?
View my online CV and Job Application[^]
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Hmm... yes that looks pretty good for actually making a string representation for the Color, but how do I get that string representation to appear as the property value in the XML?
Joel Holdsworth
Wanna give me a job over the summer?
View my online CV and Job Application[^]
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I'm developing a Windows CE .NET application.
How can I make a floating toolbar in my .NET Compact Framework application?
As alternative, can I visualize a toolbar upon the title of my form instead of inside (and on the top of) the form itself?
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hello -
I just upgraded to VS.NET 2003 and now some of my crystal reports don't seem to work. The reports appear to run but the report viewer comes up empty. I checked all the references and I believe they are current and pointing to version 9.1.5 of the new crystal decision dlls...anyone know what the problem is?
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Did you go to www.gotdotnet.com [^]and check the differences between 1.0 and 1.1 as it pertains to Crystal Reports ??
______________________________
The Tao gave birth to machine language.
Machine language gave birth to the assembler.
The assembler gave birth to ten thousand languages.
Each language has its purpose, however humble.
Each language expresses the Yin and Yang of software.
Each language has its place within the Tao.
Beauty exists because we give a name to C#.
Bad exists because we give a name to COBOL.
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actually, we just ended up installing the Crystal Reports monthly hot fix and using the newest merge modules for VS.NET 2003 and now it works fine. Guess in an ideal world, we should have had to apply a patch for a 2003 upgrade but seems fine now. thanks.
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Hi,
I need to send changes to database in web service sitting on another machine with DB. I was thinking of using the following code in order to
do the update:
<br />
<br />
SqlConnection myCon = new SqlConnection(sCon1);<br />
SqlDataAdapter da = new SqlDataAdapter();<br />
<br />
da.SelectCommand = @"INSERT INTO MidnightReadings " +<br />
"(MR_Date, Coal_Feeder_Tot, Coal_Silo_Level_Prct, Coal_Barn_Inv_Prct, Limestone_Feed_Total, LS_Silo_Level_Prct, Ammonia_Totalizer, " +<br />
"Prop_to_Burn_Totalizer, TwentyFourHr_SO2_Reduct, Limestone_Received, Ammonia_Received, Prop_Received, Est_hours_Dry_Oper_Hours, " +<br />
"Est_hours_Dry_Oper_Mins, LAB_Sulfur_Content_Prct, LAB_High_Heat_Val, CEMS_SO2_Daily_Avg, SO2_Daily, Raw_Water_Pump_Meter, " +<br />
"Reservoir_Level, Comments, Date_Rec_Added) " +<br />
"VALUES(@MR_Date, @Coal_Feeder_Tot, @Coal_Silo_Level_Prct, @Coal_Barn_Inv_Prct, @Limestone_Feed_Total, @LS_Silo_Level_Prct, " +<br />
"@Ammonia_Totalizer, @Prop_to_Burn_Totalizer, @TwentyFourHr_SO2_Reduct, @Limestone_Received, @Ammonia_Received, @Prop_Received, " +<br />
"@Est_hours_Dry_Oper_Hours, @Est_hours_Dry_Oper_Mins, @LAB_Sulfur_Content_Prct, @LAB_High_Heat_Val, @CEMS_SO2_Daily_Avg, " +<br />
"@SO2_Daily, @Raw_Water_Pump_Meter, @Reservoir_Level, @Comments, @Date_Rec_Added); " +<br />
" SELECT MR_ID, MR_Date, Coal_Feeder_Tot, Coal_Silo_Level_Prct, Coal_Barn_Inv_Prct, Limestone_Feed_Total, LS_Silo_Level_Prct, " +<br />
" Ammonia_Totalizer, Prop_to_Burn_Totalizer, TwentyFourHr_SO2_Reduct, Limestone_Received, Ammonia_Received, Prop_Received, " +<br />
" Est_hours_Dry_Oper_Hours, Est_hours_Dry_Oper_Mins, LAB_Sulfur_Content_Prct, LAB_High_Heat_Val, CEMS_SO2_Daily_Avg, " +<br />
" SO2_Daily, Raw_Water_Pump_Meter, Reservoir_Level, Comments, Date_Rec_Added FROM MidnightReadings WHERE (MR_ID = @@IDENTITY)";<br />
<br />
SqlCommandBuilder cb = new SqlCommandBuilder(da);<br />
<br />
da.Update(dsDiff,"MidnightReadings");<br />
myCon.Close();<br />
<br />
Does the code look correct for building my update?
Heath had said this is the most efficient way in order to update db.
As you can see my insert statement is big. Is this common to have such a
big sql statement or is there a short version I should be using?
Thanks,
JJ
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As far as the length of the command is concerned, the more information you get into one command is better, since you don't have to reopen the sql connection, and execute multiple commands after each successive command is executed. So, its perfectly fine to do so.
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Hi,
With the way I have this setup do I also have to add parameters to the DataAdapter for each of the values?
JJ
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yea, you definately want to do that!
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If the User hit's the "Close Window"-Button (on the right upper corner) the window should be hide.
How can I stop the closing process and set a this.Hide(); command?
Thanks!
Ariadne
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You want to setup an EventHandler that will handle the ClosingEvent in the form. To be capable of closing the form eventually, you need to manage the state of shutdown. (Was it invoked by me or was it invoked via the X button being clicked?) A [Close] button would handle the actual shutdown and the Closing event handles what to do based on the current state of the form.
So you have something like this:
using System.ComponentModel;
...
this.Closing += new CancelEventHandler(this.ClosingEventHandler);
bool ShutDownInvoked = false;
...
public void CloseRequested_Click(object sender, EventArgs e)
{
ShutDownInvoked = true;
this.Close();
}
public void ClosingEventHandler(object sender, CancelEventArgs e)
{
if (ShutDownInvoked)
return;
this.Hide();
e.Cancel = true;
}
______________________________
The Tao gave birth to machine language.
Machine language gave birth to the assembler.
The assembler gave birth to ten thousand languages.
Each language has its purpose, however humble.
Each language expresses the Yin and Yang of software.
Each language has its place within the Tao.
Beauty exists because we give a name to C#.
Bad exists because we give a name to COBOL.
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Handle the Form.Closing event (or override OnClosing in a derivative class), set CancelEventArgs.Cancel to true and call Hide:
public class MyForm : Form
{
protected override void OnClosing(CancelEventArgs e)
{
e.Cancel = true;
Hide();
}
private void mnuFileExit_Click(object sender, EventArgs e)
{
Application.Exit();
}
}There's other things you can do, such as handling the proper Windows messages like WM_QUERYENDSESSION or WM_ENDSESSION, but you may not have to (and familiarity with Windows messaging is helpful).
Microsoft MVP, Visual C#
My Articles
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This has been done so many times it's not even funny, but what is funny is I can't figure out the correct phrase to type into google to find my answer. I need to shorten a paragraph of text into a summary of about 20 to 25 words followed by '...'. Using C# of course. What phrase would you use in google to search for such a method?
I made my own kewl little solution... let me know if you can think of a better way ...
<br />
string temp = mystring;<br />
if (temp.length > 200)
{ <br />
temp = temp.substring(0, 200);
<br />
temp = temp.substring(0, temp.lastIndexOf(" ")) + "...";<br />
}<br />
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