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The ColorConverter converts either color names (from the KnownColors enumeration) or hex values with or without the pound (#) sign. That should work when you read the string using AppSettings["ColorClosed"] (no need to call ToString, BTW, since it already is a string and - if it's not in your .config file - would return null thus throwing a NullReferenceException. If you want to store colors using the R,G,B notation, then you'll need to split the strigs, convert them to ints, and use Color.FromArgb, which you seem to be doing.
Since you didn't tell us what the actual problem is (i.e., what Exception is thrown and what the message is), all I can do is guess that your .config file isn't 1) named correct (should be YourAppName.exe.config), and/or 2) isn't in the same directory as the application. The best thing is to step through your code and check the state of each variable. It also helps to split your longer statements into shorter ones - the compiler will do that anyway so there's no loss in performance.
Microsoft MVP, Visual C#
My Articles
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Ok, a better explenation:
I have made a user control that simple draws a circle and will fill that circle with a color defined in the config file. Then I want to drag this user control out on my main form but when I do this the following error occurs:
"An exception occured while trying to create an instance of xxxx. The excepiton was "ColorConverter cannot convert from (null)"."
The config file is named app.config is in the same directory as the user control and contains
add key="ColorClosed" value="#FF0000"
Now my code looks like this in the user control:
//Declaration of redBrush
SolidBrush redBrush = new SolidBrush((Color)TypeDescriptor.GetConverter(typeof(Color)).ConvertFromString(System.Configuration.ConfigurationSettings.AppSettings["ColorClosed"]));
The method that draws the circle looks like this;
private void CircleControl_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics dc = this.CreateGraphics();
dc.DrawEllipse(blackPen, 0, 0, 40, 40);
if(_status == Switch.Open)
{
dc.DrawRectangle(blackPen, 0, 15, 40, 10);
dc.FillRectangle(greenBrush, 0, 15, 40, 10);
}
else if(_status == Switch.Closed)
{
dc.DrawRectangle(blackPen, 15, 0, 10, 40);
dc.FillRectangle(redBrush, 15, 0, 10, 40);
}
else if(_status == Switch.Intermediate)
{
dc.FillEllipse(yellowBrush, 0, 0, 40, 40);
}
else
{
}
}
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Like I said, the .config file must use the same name as your application (case-insensitive) with .config appended. app.config is not a valid name, which is why you're getting null (which you should be checking anyway - NEVER trust any user input whether directly or indirectly input into your code).
If your application is called MyApp.exe, then your config file must be called MyApp.exe.config. This is documented in the .NET Framework SDK.
If you want, create a new file in your project called App.config (must be an upper-case "A", at least in VS.NET 2002). The project "compiler" will rename this appropriately and will copy it to the target directory for the current build.
Microsoft MVP, Visual C#
My Articles
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I'm trying to convert a string written in a config file to a System.Drawing.Color and I have tried lots of different solutions but nothing have worked. This is the last shot a had on it:
------------------------------------------------------
app.config
<add key="ColorOpen" value="0,181,0">
------------------------------------------------------
private SolidBrush GetClosed()
{
string strClosed = System.Configuration.ConfigurationSettings.AppSettings["ColorClosed"];
string[] parts =strClosed.Split(',');
int rValue = int.Parse(parts[0]);
int gValue = int.Parse(parts[1]);
int bValue = int.Parse(parts[2]);
Color colorClosed = Color.FromArgb( rValue, gValue, bValue );
SolidBrush redBrush = new SolidBrush(colorClosed);
return redBrush;
}
------------------------------------------------------
I have also tried this:
SolidBrush redBrush = new SolidBrush((Color)TypeDescriptor.GetConverter(typeof(Color)).ConvertFromString(System.Configuration.ConfigurationSettings.AppSettings["ColorClosed"]));
---------------------------------------------------------
and this:
string strOpen = System.Configuration.ConfigurationSettings.AppSettings["ColorOpen"].ToString();
Color colorOpen = (Color)TypeDescriptor.GetConverter(typeof(Color)).ConvertFromString(strOpen);
SolidBrush greenBrush = new SolidBrush(colorOpen);
-----------------------------------------------------------
Please help me!! I'm going creazy over this!
/Anze
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Hi there. How about the ColorTranslator class? Here's a link to the MSDN documentation[^]
using System.Drawing;
Color c = ColorTranslator.FromHtml("#999999");
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I am sorry for My English is poor
i want to ask that
i have a .XSD file which have an complexType
the complexType have some element
can i use fill method to fill these element
study everyday
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i think that you have to use the datareader to fill it up
Mhmoud Rawas
------------
Software Eng.
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thank you
i will try
study everyday
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It's better to use a DataAdapter.
Microsoft MVP, Visual C#
My Articles
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Don't use a DataReader with a DataSet - you have to handle a lot of code yourself that a DataAdapter already does for you if you establish the table and column mappings either programmatically or - like you seemed to have done - by creating a typed DataSet. If you give your DataAdapter derivative (like the SqlDataAdapter) at least a SelectCommand, it will fill your typed DataSet correctly (so long as the SQL statement corresponds to the typed DataSet) when you call DataAdapter.Fill. If you assign the optional properties, DeleteCommand, UpdateCommand, and InsertCommand on the DataAdapter, you can also call Update to update your ADO.NET data source with changes made to your DataSet since you last fill it (or called AcceptChanges, which removes all tracking information for each row).
Microsoft MVP, Visual C#
My Articles
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thank you
i find that i can use fill method
your Suggest is very good for me
my english is poor
so there are maybe some errors with english :;P
study everyday
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I'm wondering how to display tabs or buttons for open documents in a multiple document interface.
For example, lets say there are 5 documents open in the MDI Container, and they are all maximized, there is no way to swap back and forth to the other documents.
What would be the best way to do this?
Thanks in advance,
Jon
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You could add a Menu to the MDI Parent, call it, say, &Window, and set it MDIList property to true.
RageInTheMachine9532
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I have made a windows menu for open windows, but this is not what I am trying to do. I need some kind of tab style control so that users can click on directly to swap back and forth, kinda like all good MDI applications.
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Then you'll need to either create your own form classes and owner-draw these tabs, or use an existing library like Magic Controls which can be found here on CodeProject (along with other implementations). Magic Controls is now a commercial library, but an older, stable version is posted here for the CodeProject community.
Microsoft MVP, Visual C#
My Articles
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I have 3 radiobuttons on a form, when i do this in the code:
if ((optWin32.Checked) or (optWin32Unix.Checked))
i get 2 mistakes:
'Lay_out.frmSessions.optWin32' denotes a 'field' where a 'class' was expected<br />
<br />
The name 'or' does not exist in the class or namespace 'Lay_out.frmSessions'
what can i do about it?
thx in advance
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or is not part of the C# language. You should use the boolean operator || instead. See this web site for a list of operators in C#[^]
"You can have everything in life you want if you will just help enough other people get what they want." --Zig Ziglar
Coming soon: The Second EuroCPian Event[^].
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Hello,
i'm trying to connect a DataGrid with a query that read a table of an MDB Access database. I've used OleDbConnection, OleDbDataAdapter and DataSet to access via the OLEDB 4.0 Provider the file. After that i can see the records.
The code, used in Form Load is:
<br />
connection1 = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\Temp\\Brick1.MDB");<br />
<br />
dataadapter1 = new OleDbDataAdapter("SELECT * FROM [Articles];", connection1);<br />
<br />
dataset1 = new DataSet("DataSetTest");<br />
dataadapter1.Fill(dataset1, "articles");<br />
<br />
dataGrid1.DataSource = dataset1.Tables["articles"];<br />
The problem is that if i change some cell value, than i close the window and reopen, i cant see any change of mine. Is there a simple way to update the data at every cell change or when selection is moved on a new row? i cant see any update events on the DataGrid component.
I've searched for tutorials about this but i cant find anything about "forcing data update" from the grid.
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Gian wrote:
there a simple way to update the data at every cell change or when selection is moved on a new row? i cant see any update events on the DataGrid component.
CurrenCellChaneged event.
Mazy
"I think that only daring speculation can lead us further and not accumulation of facts." - Albert Einstein
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The DataGrid is only a view on the data. The CurrentCellChanged event isn't really the place to update the database with your changes, which you must do manually. Changing values in the DataGrid will change your DataSet, but you must update the database with those changes using OleDbDataAdapter.Update, which requires that you assign the necessary properties like InsertCommand, UpdateCommand, and DeleteCommand, besides the required SelectCommand. If you don't update the database, then when you re-get your DataSet it won't have any changes. This is not automatic.
Again, the CurrentCellChanged is fired too often and should not be used to update your database. Instead, do that when the form is closed or use a button who's Click event handler updates the database.
See the OleDbDataAdapter class documentation for more information.
Microsoft MVP, Visual C#
My Articles
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Hi!
I have produced a class library with documentation (<summary>, <param > ...) of any type and member. But after compiling it, my documentation is lost.
How can I include my documentation into my comiled assembly, so that it appears in IntelliSense and Object Browser??
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You can define a path for the assemblyname.xml file in your project's properties.
If this XML documentation has the same name as the DLL, IntelliSense will find it in the folder that contains the assembly and display the summaries.
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Go into your Project Properties, Configuration Properties, Build, and make sure that XML Documentation File is set to the same filename with an XML extension as your assembly. For instance, if your target filename is myAssm.DLL, then your XML Doc filename should be myAssm.DLL.XML.
RageInTheMachine9532
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Actually, just myAssm.xml is fine. This is how the FCL XML documentation is named as well.
Microsoft MVP, Visual C#
My Articles
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XmlNode test = xml.SelectSingleNode("/session/parameters/developmentsession");<br />
if (test.InnerText.ToString() = "true")<br />
chkDevelopment.Checked = true;<br />
else chkDevelopment.Checked = false;
what is wrong with this if-structure? The compiler says
Cannot implicitly convert type 'string' to 'bool'
Thx in advance
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