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  • C# trying to capture the KeyDown event on a form

    - by Patrick
    Hello! I am creating a small game, the game is printed onto a panel on a windows form. Now i want to capture the keydown event to see if its the arrow keys that has been pressed, the problem however is that i can't seem to capture it. Let me explain, on the form i have 4 buttons and various other controls and if the user for instance press one of the buttons (to trigger a game event) then the button has focus and i can't capture the movements with the arrow keys. I tried something like private void KeyDown(KeyEventArgs e) { if (e.KeyCode == Keys.Left) { game.MovePlayer(DonutWarsLibrary.GameObjects.Direction.E); game.DrawObjects(panel1.CreateGraphics()); } else if (e.KeyCode == Keys.Right) { game.MovePlayer(DonutWarsLibrary.GameObjects.Direction.W); game.DrawObjects(panel1.CreateGraphics()); } else if (e.KeyCode == Keys.Up) { game.MovePlayer(DonutWarsLibrary.GameObjects.Direction.N); game.DrawObjects(panel1.CreateGraphics()); } else if (e.KeyCode == Keys.Down) { game.MovePlayer(DonutWarsLibrary.GameObjects.Direction.S); game.DrawObjects(panel1.CreateGraphics()); } } and then when the form key down event was pressed, i used this private void MainForm_KeyDown(object sender, KeyEventArgs e) { KeyDown(e); } I also added keydown for the buttons and the various other controls on the windows form, but i am not getting any response back. I have setup a breakpoint inside the function to see if it's being called, but that breakpoint never triggers? Any ideas? The most optimal was to have a general KeyDown event that triggers (regardless of what control that currently has focus) and then calls the KeyDown method.

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  • Windows Forms: Enable/Disable WS_CLIPCHILDREN

    - by Agnel Kurian
    How do I turn on/off the WS_CLIPCHILDREN window style in a Windows Forms parent control? I would like to display some text on top of the child control after it has painted. In my parent control, this is what I have: class Parent : public Control { void Parent::OnPaint(PaintEventArgs ^e){ Control::OnPaint(e); // parent draws here // some drawing should happen over the child windows // in other words, do not clip child window regions } }; On checking with Spy++ I find that the parent has the WS_CLIPCHILDREN window style enabled by default. What is the Windows Forms way to turn this off? Note: Sample code is in C++/CLI but I have tagged this C# for visibility... language is immaterial here. Feel free to translate the code to C#.

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  • WPF User Control is causing Out of Memory Exception

    - by Chairman Meow
    Looking for a free spell checking solution, I thought I was so smart in doing this but I guess not. I have created a windows form based application and I want the form to add a user specified amount of user controls (with textboxes) on to a panel. The user can then click some button and the controls on this panel are cleared and new ones are added. The user does something and the process is repeated. Now, I wanted these textboxes to support spell checking and looked all over for a free solution. WPF textboxes support spell checking where the ones in regular win forms do not. I thought I would be able to use these WPF textboxes by adding them to an ElementHost object which is, in turn, within a panel. This panel would be a user control. So, in my application, I would be able to add instances of these user controls onto the form and make use of .NET's spell checking goodness. This actually worked but after using the application for a while, found that the application would eventually freeze on me due to out of memory errors. I have pinpointed the memory errors to these WPF controls since this problem does not happen with normal textboxes. When the window is opened and the number of controls is specified, this is pretty much how the controls are added: Dim xOffset As Integer = 0 For i As Integer = 0 To theNumber Dim myUserControl As New SpecialUserControl() myPanel.Controls.Add(myUserControl) myUserControl.Location = New Point(7, 7) myUserControl.Location = New Point(xOffset, 7) xOffset = xOffset + 207 Next Note that: myPanel is a panel on a form SpecialUserControl is the user control with WPF textbox (within an ElementHost object) When the user pressed a button, the panel is cleared: myUserControl.Controls.Clear() The user can then repeat the process. There are a lot of results on the internet when I tried to find a solution and I'm thinking that the problem I am having is due to the fact that the WPF control is not going away even after clearing the panel. Following this conclusion, I have tried different solutions regarding disposing these controls or setting them to nothing but the memory problem keeps occurring. If someone could give me some advice or ideas here, I'd really appreciate it.

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  • How to Detect Right Click on the Taskbar

    - by Zay
    I've got a Windows Forms application in C# that starts off with a loading dialog. As expected, a button for the app shows up in the Windows taskbar. I would like to detect right-clicks that might be done to that button. Ultimately, I hope to disable the right-click or simply have the loading dialog regain focus. I've seen that some people use custom libraries and packages (interop, for example) to achieve some Win32 functionality, but I'd personally like to avoid this. Is it impossible to do without such libraries/packages?

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  • How to store user settings(username,password) in a windows application for the current login user

    - by amexn
    Now my team working in a project using windows application(c#). The application have a option for saving the username & password in the client machine for the current login user.so the user can start the application without entering username & password.I didn't have any knowledge in the windows application.Please check the snapshot of my requirement. Please suggest good example/reference.

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  • WinForm Text Control that displays current character/character limit

    - by Refracted Paladin
    I need a way to display, like you see in some web apps, the current characters/character limit for a Text Control(i.e. 3/500). I usually see this as a label residing directly above or below the Text Control. How is this 'normally' accomplished? Should I override my Text Control somehow? Do I just manually add labels by every Text Control and 'bind' them to properties of the Text Control? Do I need to create a composite control that has the Text Control & Label Controls together to accomplish what I need? Any direction or help will be greatly appreciated.

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  • Resize a ListView depending on how many items?

    - by Dodi300
    Hello. How can I resize the height of a ListView depending on how many items are in that ListView? I'm trying to get the text of an item which is clicked, however whenever the user clicks on a space which has no item, there's an error. The exact error is: InvalidArgument=Value of '0' is not valid for 'index'. Parameter name: index. I'm using the code: label14.Text = myListView1.SelectedItems[0].Text.ToString(); I figured that removing the space below the items will solve this problem. Thanks!

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  • Propertygrid changes not picked up when using menu shortcut for saving

    - by Ebbe
    I am trying to implement a simple windows forms application, where the user can edit instances of a simple Person class. The application makes use of the standard propertygrid, assigning instances of the Person class to the SelectedObject property of the propertygrid. When the user clicks the menu item Save, the application gets the selected item from the propertygrid and saves it. This works fine. However, if a shortcut such as ctrl+S, assigned to the menu item, is used for saving the SelectedObject of the propertygrid, then the changes are not picked up. It appears to be related to the fact that the properties of the Person object are not updated unless the field in the propertygrid looses focus, and the ctrl+S shortcut doesn’t take away focus from fields in the propertygrid. Other developers, such as Mark Gilbert, have solved this issue by forcing away focus from the propertygrid, but this seems to be a bit of a hack, especially since it would be nice to keep the focus at the field. The Visual Studio developers apparently got it right, but I haven’t figured out how.

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  • Localize node texts in treeview using resource files

    - by Obalix
    For a project I need a tree view that allows the user to select a module, which then is displayed in a content area. The project relies heavily on localization and this is provided by the resource files. Now I discovered today, that the text that are assigned to preset tree view nodes are not contained in the resource files. So the question is whether there is a way of doing this, short of mapping the elemenst in code. I.e. assigning a name to the node, running over all nodes and pulling the resources from the resouce manager based on the node name. This is what I am currently doing, however, it just doesn't "feel" right: private void TranslateNodes(TreeNodeCollection treeNodeCollection) { var rm = Resources.ResourceManager; foreach (TreeNode node in treeNodeCollection) { node.Text = rm.GetString(node.Name + "_Text"); this.TranslateNodes(node.Nodes); } } Thanks!

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  • Parts of statusbar disappearing with IE BHO

    - by Jake Resier
    I have a C# IE BHO in use for an internal company app that is adds a pane to the statusbar with SB_SETPARTS (it mitm's the SETPARTS call and inserts an element into the array) and then draws the controls by moving them from a hidden (in-process) form with SetParent() This technique works well but it causes other parts of the statusbar to appear briefly and then disappear. Affected parts seem to be all of the panes that don't have their own hWnd, eg the "Internet | Protected Mode" and icon, and some of those icons that appear in the six panes immediately to the left. Does anyone know what is causing this? I suspect that either certain messages aren't getting to the statusbar32 control to draw the stuff, or my WindowsForms10 additions are sending out extraneous messages. Everything appears fine for about a second, and then the other parts just disappear.

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  • Is there a way to delay an event handler (say for 1 sec) in Windows Forms

    - by Essam
    I need to be able to delay the event handlers for some controls (like a button) to be fired for example after 1 sec of the actual event (click event for example) .. is this possible by the .net framework ? I use a timer and call my code from the timer's tick event as below but I am not sure if this is the best approach ! void onButtonClick( ..) { timer1.Enabled = true; } void onTimerTick( ..) { timer.Enabled = false; CallMyCodeNow(); }

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  • Neither Invalidate() nor Refresh() invokes OnPaint()

    - by user181813
    I'm trying to get from Line #1 to Line #2 in the below code: using System; using System.Windows.Forms; namespace MyNameSpace { internal class MyTextBox : System.Windows.Forms.TextBox { protected override void OnEnabledChanged(EventArgs e) { base.OnEnabledChanged(e); Invalidate(); // Line #1 - can get here Refresh(); } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); System.Diagnostics.Debugger.Break(); // Line #2 - can't get here } } } However, it seems that neiter Invalidate() nor Refresh() causes OnPaint(PaintEventArgs e) to be invoked. Two questions: Why doesn't it work? If it can't be fixed: I only want to invoke OnPaint(PaintEventArgs e) in order to access the e.Graphics object - is there any other way to do this?

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  • Can you change VS Win Forms designer code generation?

    - by Big Endian
    We implemented new standards, which call for our private members to have a leading underscore. Like so: private System.Windows.Forms.Label _label; Unfortunately VS will put out the default below when you drag a new label onto your form: private System.Windows.Forms.Label label1; Is there a way to change that to: private System.Windows.Forms.Label _label1; Cheers, Plamen

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  • Sending keystrokes to a program

    - by Or Betzalel
    In window form, I made a button and I'm trying to make it send F1 to a specific window (Such as FireFox, My Computer, etc...) My questions are : How do I do it by the window's name? (such as "Mozilla Firefox") How do I do it by the process's name? (such as firefox.exe)

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  • Internationalize HelloWorld program .NET

    - by RockStarInTraining
    I have small test app which has 2 resource files (Resources.resx & Resources.de-DE.resx) with the same exact string names, but one has the strings converted to German. For my form I set the Localize property to ture. In my application I am getting the strings as such: this.Text = Properties.Resources.frmCaption; In my release folder I get a de-DE folder with a dll named International_test.resources.dll. I try to distribute this to a machine which is set to German and all of the strings pulled are still english. I tried keeping the International_test.resources.dll in the de-DE folder or just put in in my apps directory. What am I doing wrong or what do I need to do to get the German resource file to be used?

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  • How can we define more than one table,define columns and write data in xml file ?

    - by Harikrishna
    I am writing my xml file manually. And I am writing that for storing data and retrieving data from that. I have written file like for the table PersonalInfo. <?xml version="1.0" standalone="yes"?> <PersonalInfo> <xs:schema id="PersonalInfo" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"> <xs:element name="PersonalInfo" msdata:IsDataSet="true" msdata:UseCurrentLocale="true"> <xs:complexType> <xs:choice minOccurs="0" maxOccurs="unbounded"> <xs:element name="PesonalInfo."> <xs:complexType> <xs:sequence> <!--Define Column Here....--> <xs:element name="name" type="xs:string" /> <xs:element name="address" type="xs:string" /> </xs:sequence> </xs:complexType> </xs:element> </xs:choice> </xs:complexType> </xs:element> </xs:schema> <!--First Row--> <PersonalInfo.> <name>Harikrishna</name> <address>India</address> </PersonalInfo.> <!--Second Row--> <PersonalInfo.> <name>Jatin</name> <address>India</address> </PersonalInfo.> </PersonalInfo> Please suggest any mistake with writing file here. And now I want define more than table in this file. And here I have to write data for the table like <PersonalInfo.> <name>Harikrishna</name> <address>India</address> </PersonalInfo.> <PersonalInfo.> <name>Jatin</name> <address>India</address> </PersonalInfo.> Is not possible some thing writing data when defining columns EDIT : <xs:element name="name" type="xs:string",Harikrishna,Jatin.... /> <xs:element name="address" type="xs:string",India,India.... /> And how to define more than one table in a single xml file ?

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  • Binding Source suspends itself when I don't want it to.

    - by Scott Chamberlain
    I have two data tables set up in a Master-Details configuration with a relation "Ticket_CallSegments" between them. I also have two Binding Sources and a Data Grid View configured like this (Init Code) // // dgvTickets // this.dgvTickets.AllowUserToAddRows = false; this.dgvTickets.AllowUserToDeleteRows = false; this.dgvTickets.AllowUserToResizeRows = false; this.dgvTickets.AutoGenerateColumns = false; this.dgvTickets.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize; this.dgvTickets.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] { this.cREATEDATEDataGridViewTextBoxColumn, this.contactFullNameDataGridViewTextBoxColumn, this.pARTIALNOTEDataGridViewTextBoxColumn}); this.dgvTickets.DataSource = this.ticketsDataSetBindingSource; this.dgvTickets.Dock = System.Windows.Forms.DockStyle.Fill; this.dgvTickets.Location = new System.Drawing.Point(0, 0); this.dgvTickets.MultiSelect = false; this.dgvTickets.Name = "dgvTickets"; this.dgvTickets.ReadOnly = true; this.dgvTickets.RowHeadersVisible = false; this.dgvTickets.SelectionMode = System.Windows.Forms.DataGridViewSelectionMode.FullRowSelect; this.dgvTickets.Size = new System.Drawing.Size(359, 600); this.dgvTickets.TabIndex = 0; // // ticketsDataSetBindingSource // this.ticketsDataSetBindingSource.DataMember = "Ticket"; this.ticketsDataSetBindingSource.DataSource = this.ticketsDataSet; this.ticketsDataSetBindingSource.CurrentChanged += new System.EventHandler(this.ticketsDataSetBindingSource_CurrentChanged); // // callSegementBindingSource // this.callSegementBindingSource.DataMember = "Ticket_CallSegments"; this.callSegementBindingSource.DataSource = this.ticketsDataSetBindingSource; this.callSegementBindingSource.Sort = "CreateDate"; //Function to update a rich text box. private void ticketsDataSetBindingSource_CurrentChanged(object sender, EventArgs e) { StringBuilder sb = new StringBuilder(); rtbTickets.Clear(); foreach (DataRowView drv in callSegementBindingSource) { TicketsDataSet.CallSegmentsRow row = (TicketsDataSet.CallSegmentsRow)drv.Row; sb.AppendLine("**********************************"); sb.AppendLine(String.Format("CreateDate: {1}, Created by: {0}", row.USERNAME, row.CREATEDATE)); sb.AppendLine("**********************************"); rtbTickets.SelectionFont = new Font("Arial", (float)11, FontStyle.Bold); rtbTickets.SelectedText = sb.ToString(); rtbTickets.SelectionFont = new Font("Arial", (float)11, FontStyle.Regular); rtbTickets.SelectedText = row.NOTES + "\n\n"; } } However when ticketsDataSetBindingSource_CurrentChanged gets called when I select a new row in my Data Grid View callSegementBindingSource.IsBindingSuspended is set to true and my text box does not update correctly (it seems to always pull from the same row in CallSegments). Can anyone see what I am doing wrong or tell me how to unsuspend the binding so it will pull the correct data?

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  • how to get all controls of win form?

    - by Shailesh
    i have a win form named A , A contains lots of different controls ,first contains a main groubbox and this groupbox countains lots of table and others group boxes. i want to find a control which has tab index 9(example) in form A but i dont know which groubox contains this control. how i found this control. regards Shailesh

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  • .net Value Class sorting with IComparable

    - by greggorob64
    I'm running into an issue using a DataGridView bound to a iBindingListView implementation (third party dll) attached to a large collection. There's a certain property in my collection type, named MyDateTime, which is a value class similar to DateTime, but also with some legacy code. This VALUE CLASS implements iComparable, iComparable<T>, and iEquatable<T>. The issue I'm having is this: When I apply a sort to the iBindingListView, or the Automatic Sorting provided by the DGV on the MyDateTimeColumn, it ALWAYS uses the non-generic iComparer, causing hundreds of thousands of unnecessary boxing and unboxing. When I remove the non-generic iComparer, the generic one is still not used, it just does a string compare on the .ToString(). Am I missing something? Why is my generic comparer not bieng called on a sort?

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