I was developing a WinForm application for a class and I ran into a bug that I can't seem to find the root of. When I run the application everything works except for an error label that was supposed to come up with incorrect user input. At first I thought I had written the event handler for it wrong, so I stopped hiding it at startup but the label is still missing. I'm not sure if I'm missing something in some back-end file or if I'm just missing something really obvious.
This is the function that creates the label.
private void InitializeErrorLabel()
{
int width = 200, height = 13,
anchorY = this.Label.Location.Y - this.Label.Size.Height - 3;
// Initialize Component
this.ErrorLabel.AutoSize = true;
this.ErrorLabel.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold,
System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.ErrorLabel.ForeColor = System.Drawing.Color.Red;
this.ErrorLabel.Location = new System.Drawing.Point((XSize - width) / 2, (anchorY - height));
this.ErrorLabel.Anchor = System.Windows.Forms.AnchorStyles.Top;
this.ErrorLabel.Name = "ErrorLabel";
this.ErrorLabel.Size = new System.Drawing.Size(width, height);
this.ErrorLabel.Text = "Invalid User ID. Please try again!";
return;
}
and this is the function that initializes my controls:
private void InitializeComponent()
{
this.UserInput = new System.Windows.Forms.TextBox();
this.SwitchMajor = new System.Windows.Forms.RadioButton();
this.SwitchToCS = new System.Windows.Forms.CheckBox();
this.SwitchToCE = new System.Windows.Forms.CheckBox();
this.KeepMajor = new System.Windows.Forms.RadioButton();
this.AcceptValues = new System.Windows.Forms.Button();
this.Label = new System.Windows.Forms.Label();
this.ErrorLabel = new System.Windows.Forms.Label();
this.SuspendLayout();
// Initialize Components
this.InitializeLabel();
this.InitializeMainWindow();
this.InitializeUserInput();
this.InitializeSwitchMajorBtn();
this.InitializeChangeToCSBtn();
this.InitializeChangeToCEBtn();
this.InitializeAcceptValuesBtn();
this.InitializeErrorLabel();
this.ResumeLayout();
this.PerformLayout();
return;
}
Again, not really sure what I'm doing wrong here. Any help would be appreciated.
Thanks,
In what control are you adding your errorlabel ?
A normal label initialization should look like
private System.Windows.Forms.Label ErrorLabel;
this.ErrorLabel = new System.Windows.Forms.Label();
this.groupBox2.Controls.Add(this.ErrorLabel);
this.ErrorLabel.AutoSize = true;
this.ErrorLabel.Location = new System.Drawing.Point(8, 59);
this.ErrorLabel.Name = "ErrorLabel";
this.ErrorLabel.Size = new System.Drawing.Size(55, 13);
this.ErrorLabel.TabIndex = 69;
this.ErrorLabel.Text = "Address 2";
this.ErrorLabel.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
Important
The label must be added to a control like my line three. Your control can be a form in your case. Its a groupbox in my case and the group box itself must be added to myform and myform must be visible .
this.groupBox2.Controls.Add(this.ErrorLabel);
I don't see a place where you're adding the label to the form's collection of controls:
this.Controls.Add(this.ErrorLabel);
If it's not a member of the Controls collection, you won't see it.
Related to that, I wouldn't be surprised if the other buttons, checkboxes, etc you're defining are not showing up on the form either, for the same reason.
Normally this would be taken care of by the Designer.cs file automatically.
This might be an obvious answer, but it totally went over my head. I verified that my code had the this.groupBox2.Controls.Add(this.ErrorLabel); like others have mentioned here. I couldn't figure out why I wasn't seeing my label. My label was an asterisk *, and in the designer window, I size it pretty small, but I was able to see the * in the designer window. Turns out I just had to increase it's area in the designer window since it was to small when I actually rendered the App.
Related
In my winform control I am adding picture box and assigning an image from the Resources. This works great, however I need to change the image based on business logic and this is where the issue begins. I am setting up the Image to the new one but it refuses to get updated. I have also tried to use Refresh, Update or Invalidate on a picturebox again without any success. How to change the picturebox image dynamically ? Am I using the right control?
Below is Designer autogenerated code which works fine:
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.pictureBox1 = new System.Windows.Forms.PictureBox();
((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
this.SuspendLayout();
//
// pictureBox1
//
this.pictureBox1.Dock = System.Windows.Forms.DockStyle.Fill;
this.pictureBox1.Image = global::UnumIDOutlookAddIn.Properties.Resources.MyImage;
this.pictureBox1.Location = new System.Drawing.Point(0, 0);
this.pictureBox1.Name = "pictureBox1";
this.pictureBox1.Size = new System.Drawing.Size(616, 86);
this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.Zoom;
this.pictureBox1.TabIndex = 1;
this.pictureBox1.TabStop = false;
//
// WinformComponent
//
this.AutoScaleDimensions = new System.Drawing.SizeF(9F, 20F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.Controls.Add(this.pictureBox1);
this.Name = "WinformComponent";
this.Size = new System.Drawing.Size(616, 86);
(this.pictureBox1)).EndInit();
this.ResumeLayout(false);
}
However, later on I am trying to update the Image, and it never updates. I have tried to differnt order on the last three lines without any success as well.
mycomponent.pictureBox1.Image = Resources.AnotherImage;
mycomponent.pictureBox1.Invalidate(); <-- Tried many configuratons
mycomponent.pictureBox1.Update();
mycomponent.pictureBox1.Refresh();
** I'm completely guessing as to what your problem is. **
Most likely you're doing something like this:
Form1 mycomponent = new Form1(); // Form1 is just an example
mycomponent.pictureBox1.Image = Resources.AnotherImage;
You're making a NEW form and updating the pictureBox on that Form, a Form that is never actually displayed.
If you want to update the Form that is ALREADY VISIBLE on your screen, then you need a reference to that specific form.
Getting a reference to the visible form can be done in various ways. Understanding the CONTEXT of your program will allow us to give you the easiest method to do this.
What forms are involved? Which forms create which ones, in what order? These things matter...
At runtime I add (and remove) several controls, as needed, to a main window which in Designer contains only a ToolStrip with some function buttons. In some cases I want to add an info label next to the toolStrip, but I cannot make it visible, ie. it is hidden below. The code for the label is straightforward
infoLabel = new Label();
infoLabel.AutoSize = true;
infoLabel.Location = new System.Drawing.Point(200, 10);
infoLabel.Size = new System.Drawing.Size(35, 13);
infoLabel.BackColor = System.Drawing.SystemColors.Control;
infoLabel.Font = new System.Drawing.Font("Arial", 13);
infoLabel.ForeColor = System.Drawing.Color.Black;
infoLabel.TabIndex = 1;
infoLabel.Text = "this is info";
infoLabel.BringToFront();
this.Controls.Add(infoLabel);
TabIndex and BringToFront I added as an act of desperation, it does not help. BTW the ToolStrip's TabIndex is 2, and its BackColor I changed to transparent.
However, when I placed a label over the ToolStrip in the Designer, it is visible (ie. on top). I analysed the code then but did not see anything different from what I am writing. What am I missing here?
I suggest calling infoLabel.BringToFront(); at the very end, at least after this.Controls.Add(infoLabel); you current code amended:
infoLabel = new Label();
...
infoLabel.Text = "this is info";
// First Add to this
this.Controls.Add(infoLabel);
// Only then we can make infoLabel be the topmost
// among all existing controls which are on this
infoLabel.BringToFront();
We create infoLabel, add it to this and finally make it topmost on this. To make code more readable I suggest something like this:
// Create a label on this
infoLabel = new Label() {
AutoSize = true,
Location = new System.Drawing.Point(200, 10),
Size = new System.Drawing.Size(35, 13),
BackColor = System.Drawing.SystemColors.Control,
Font = new System.Drawing.Font("Arial", 13),
ForeColor = System.Drawing.Color.Black,
TabIndex = 1,
Text = "this is info",
Parent = this // <- instead of this.Controls.Add(infoLabel);
};
// make infoLabel topmost among all controls on this
infoLabel.BringToFront();
Windows Forms controls do not have a property which you can use to set z-index of controls like one can do in CSS.
You'll need to call Parent.SetChildIndex(control, 0);. The control at the front of Controls collection is the topmost in z-order for a container control.
I want to combine several winform applications into 1 master application. I created a new winform project/solution and added the forms from two of the solutions. I added TabPages to the first form from which to launch other forms. I also changed the project Output Type to Library as recommended in combine multiple C# projects I am having difficulty getting the 2nd form (classBuilder) to load when I click the Class Builder tab.
I Googled how to add a form to a TabPage and most posts had very similar code that I inserted as shown but nothing happens when I click the tab. As a novice I have no idea if I’m on the right path or placed the subject code in the right place. Need someone way smarter than me to get me on track. A few concerns I have are: 1) Each form has a unique app.config file and if I attempt to rename it the main form doesn’t fill in so I put it back to App.config. I imported the config file for the 2nd form and renamed it ClassBuild.config and the concern is the 2nd form won’t fill in if and when I get it running with some expert help. 2) I don’t understand why I would issue ‘Form frmClassBuilder = new Form();’ when a form by that name already exists. Is this code okay?
namespace VX130
{
public partial class VX130UI : Form
{
public DataTable tblPKIEN;
public DataTable tblsAttributes;
public DataTable tbltAttributes;
public DataSet dsVX130;
SqlDataAdapter da = new SqlDataAdapter();
public VX130UI()
{
InitializeComponent();
WindowState = FormWindowState.Maximized;
//attempt to add form to a tabpage
Form frmClassBuilder = new Form();
frmClassBuilder.TopLevel = false;
tabPage9.Controls.Add(frmClassBuilder);
frmClassBuilder.Parent = this;
frmClassBuilder.WindowState = FormWindowState.Maximized;
frmClassBuilder.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
frmClassBuilder.Dock = DockStyle.Fill;
frmClassBuilder.Show();
//end attempt
// tabControl1
//
this.tabControl1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.tabControl1.Controls.Add(this.tabPage1);
this.tabControl1.Controls.Add(this.tabPage2);
this.tabControl1.Controls.Add(this.tabPage8);
this.tabControl1.Controls.Add(this.tabPage9);
this.tabControl1.Controls.Add(this.tabPage10);
this.tabControl1.Controls.Add(this.tabPage11);
this.tabControl1.Controls.Add(this.tabPage12);
this.tabControl1.Location = new System.Drawing.Point(13, 65);
this.tabControl1.Name = "tabControl1";
this.tabControl1.SelectedIndex = 0;
this.tabControl1.Size = new System.Drawing.Size(963, 445);
this.tabControl1.TabIndex = 2;
// tabPage9
//
this.tabPage9.Location = new System.Drawing.Point(4, 22);
this.tabPage9.Name = "tabPage9";
this.tabPage9.Padding = new System.Windows.Forms.Padding(3);
this.tabPage9.Size = new System.Drawing.Size(955, 419);
this.tabPage9.TabIndex = 3;
this.tabPage9.Text = "Class Builder";
this.tabPage9.UseVisualStyleBackColor = true;
this.tabPage9.Controls.Add(ClassBuilderUI.frmClassBuilder()); is a ‘type’ and not valid in given context
I found what was missing piece to create instance of an existing form (exists in solution).
public VX130UI()
{
InitializeComponent();
WindowState = FormWindowState.Maximized;
ClassBuilderUI.frmClassBuilder frmClassBuilder = new ClassBuilderUI.frmClassBuilder(); <== to reference existing form (exists in solution
//Form frmClassBuilder = new Form();
frmClassBuilder.Dock = DockStyle.Fill;
frmClassBuilder.TopLevel = false;
frmClassBuilder.Visible = true;
tabPage9.Controls.Add(frmClassBuilder);
tabPage9.Show();
Show the TabPage, not the form. And don't set things like Parent and WindowState for the form you are adding:
//Form frmClassBuilder = new Form();
ClassBuilderUI.frmClassBuilder frmClassBuilder = new ClassBuilderUI.frmClassBuilder(); <== to reference existing form (exists in solution
frmClassBuilder.Dock = DockStyle.Fill;
frmClassBuilder.TopLevel = false;
frmClassBuilder.Visible = true;
tabPage9.Controls.Add(frmClassBuilder);
tabPage9.Show();
I don’t understand why I would issue ‘Form frmClassBuilder = new
Form();’ when a form by that name already exists.
Exists where? How? You need an instance of the form to add to the Tab page control collection. If you already had an instance, you could add it. Just be sure it doesn't get Close() or Dispose() called on it.
The code in your ClassBuilderTab_MouseClick handler looks useless. I would remove that unless you have some other need for it.
I have a winforms application. In my application I have a user control which I loaded programmatically.
Inside this user-control I have tree view that also will be loaded with items programmatically. My problem is that I want to make my tree-view take the whole size of its parent.
What I have tried
I set the user-control Dock property to DockStyle.Fill to make it take the size of its parent.
I have done the same for the tree-view Dock property; set it to DockStyle.Fill.
What I get
The user-control takes the full size as expected but the tree-view looks like it is hidden. I checked the height, and I noticed it's 0. When I tried to change the height while it has DockStyle.Fill I can't, it changes back to 0.
Any ideas?
Update
The auto generated code for the tree-view:
private void InitializeComponent()
{
this.btnAddServer = new System.Windows.Forms.Button();
this.pnlServersContainer = new System.Windows.Forms.FlowLayoutPanel();
this.treeViewServers = new System.Windows.Forms.TreeView();
this.pnlServersContainer.SuspendLayout();
this.SuspendLayout();
//
// btnAddServer
//
this.btnAddServer.Location = new System.Drawing.Point(89, 478);
this.btnAddServer.Name = "btnAddServer";
this.btnAddServer.Size = new System.Drawing.Size(107, 23);
this.btnAddServer.TabIndex = 3;
this.btnAddServer.Text = "Add New Server";
this.btnAddServer.UseVisualStyleBackColor = true;
this.btnAddServer.Click += new System.EventHandler(this.btnAddServer_Click);
//
// pnlServersContainer
//
this.pnlServersContainer.AutoScroll = true;
this.pnlServersContainer.Controls.Add(this.treeViewServers);
this.pnlServersContainer.Dock = System.Windows.Forms.DockStyle.Fill;
this.pnlServersContainer.Location = new System.Drawing.Point(0, 0);
this.pnlServersContainer.Name = "pnlServersContainer";
this.pnlServersContainer.Padding = new System.Windows.Forms.Padding(8, 20, 0, 0);
this.pnlServersContainer.Size = new System.Drawing.Size(318, 463);
this.pnlServersContainer.TabIndex = 2;
//
// treeViewServers
//
this.treeViewServers.Dock = System.Windows.Forms.DockStyle.Fill;
this.treeViewServers.Location = new System.Drawing.Point(11, 23);
this.treeViewServers.Name = "treeViewServers";
this.treeViewServers.Size = new System.Drawing.Size(275, 0);
this.treeViewServers.TabIndex = 0;
this.treeViewServers.DoubleClick += new System.EventHandler(this.treeViewServers_DoubleClick);
//
// ucServersList
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
this.Controls.Add(this.btnAddServer);
this.Controls.Add(this.pnlServersContainer);
this.Name = "ucServersList";
this.Padding = new System.Windows.Forms.Padding(0, 0, 0, 60);
this.Size = new System.Drawing.Size(318, 523);
this.Load += new System.EventHandler(this.ucServersList_Load);
this.pnlServersContainer.ResumeLayout(false);
this.ResumeLayout(false);
}
I recommend to open Document outline editor in Visual Studio.
This shows all controls in their hierarchical order as tree.
It lets you also drag & drop the controls to the right place.
Open it with View > Other windows > Document outline.
You may fix your problem when looking at the controls order.
I have figured it out. but still don't know why this happened!
my tree-view was inside FlowLayoutPanel not Panel. When i changed it to Panel everything goes fine. that's it!
The problem might be that you have added several items to the same parent control, and then when you fill the parent dock with one of them, the behaviour would not be what you expect.
Use a splitcontainer. And when you want to fill out the dock, make sure your control belongs to two differnt panels of a splitcontainer.
See this for an concrete example.
Is there any specific reason why you use FlowLayoutPanel?
It seems that the FlowLayoutPanel does not deal with any other than Dock.None.
I think you should use a simple Panel for this application, because it does not resize the contained controls - the Dock property behaves as expected.
Replacing the FlowLayoutPanel with a Panel will fix your problem.
This is a super old question... but since there are no accepted answers I’ll give it a go.
This happened to me when my Control was set to autosize. Either removing autosize or specifying a minimum height could solve this issue.
In my application, I have a DataGridView that moves from one Tab Control to another Tab Control.
I am doing this by changing its parent. This works with no problems on the first move from the origional Tab Control to the new one, but when changing the parent back to the origional, the DataGridView shows up (all the Columns are visible) but there is no data in the view.
I have tried to reload the data into the DataGridView, and refresh/Invalidate the control to make it redraw, but it still shows up empty. However, when the control goes back to the secondary parent, the data is back.
I am also using this exact code for another DataGridView and it works without any problems at all.
Any ideas would be greatly appreciated, and thanks in advance.
From Origional to Secondary
gvwRFIs.Parent = tabProcessingRFI; //Working
gvwConsentInfoMemos.Parent = tabProcessingMemos; //Working
From Secondary to Origional
gvwRFIs.Parent = tabConsentInfoRFI; //Empty Data
gvwConsentInfoMemos.Parent = tabConsentInfoMemos; //Working
RFI DataGridView Designer Code
//
// gvwRFIs
//
this.gvwRFIs.AllowUserToAddRows = false;
this.gvwRFIs.AllowUserToDeleteRows = false;
this.gvwRFIs.AllowUserToResizeRows = false;
this.gvwRFIs.AutoSizeRowsMode = System.Windows.Forms.DataGridViewAutoSizeRowsMode.AllCellsExceptHeaders;
this.gvwRFIs.BackgroundColor = System.Drawing.Color.White;
this.gvwRFIs.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this.gvwRFIs.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
this.gvwID,
this.gvwType,
this.gvwSeq,
this.gvwCreated,
this.gvwProcessor,
this.gvwLetter,
this.gvwResponded,
this.gvwS,
this.gvwDetails});
this.gvwRFIs.Dock = System.Windows.Forms.DockStyle.Fill;
this.gvwRFIs.Location = new System.Drawing.Point(3, 3);
this.gvwRFIs.MultiSelect = false;
this.gvwRFIs.Name = "gvwRFIs";
this.gvwRFIs.ReadOnly = true;
this.gvwRFIs.RowHeadersVisible = false;
this.gvwRFIs.RowHeadersWidth = 4;
this.gvwRFIs.SelectionMode = System.Windows.Forms.DataGridViewSelectionMode.FullRowSelect;
this.gvwRFIs.Size = new System.Drawing.Size(1078, 422);
this.gvwRFIs.TabIndex = 4;
this.gvwRFIs.DoubleClick += new System.EventHandler(this.gvwRFIs_DoubleClick);
Consent Tab Control Designer Code
//
// tabConsentInfoRFI
//
this.tabConsentInfoRFI.Controls.Add(this.gvwRFIs);
this.tabConsentInfoRFI.Controls.Add(this.lvwConsentInfoRFI);
this.tabConsentInfoRFI.Location = new System.Drawing.Point(4, 32);
this.tabConsentInfoRFI.Name = "tabConsentInfoRFI";
this.tabConsentInfoRFI.Padding = new System.Windows.Forms.Padding(3);
this.tabConsentInfoRFI.Size = new System.Drawing.Size(1084, 428);
this.tabConsentInfoRFI.TabIndex = 4;
this.tabConsentInfoRFI.Text = "RFI\'s";
this.tabConsentInfoRFI.UseVisualStyleBackColor = true;
Processing Tab Control Designer Code
//
// tabProcessingRFI
//
this.tabProcessingRFI.Location = new System.Drawing.Point(4, 36);
this.tabProcessingRFI.Name = "tabProcessingRFI";
this.tabProcessingRFI.Padding = new System.Windows.Forms.Padding(3);
this.tabProcessingRFI.Size = new System.Drawing.Size(868, 465);
this.tabProcessingRFI.TabIndex = 1;
this.tabProcessingRFI.Text = "RFI";
this.tabProcessingRFI.UseVisualStyleBackColor = true;
I found the issue,
The ListView that is in the consent designer code, is an old control that looks identical, but is no longer used. So when the control is parented back to the Origional tab, it is in the background of this control.
Once the control was removed (thought it already was) the code worked perfectly.
Thank you to LarsTech for getting me in the right direction. And akhisp for there answer.
You should remove the object from the Tab.Controls list of the tab that it's no longer in. So do something like:
tabProcessingRFI.Controls.Remove(gvwRFIs);
gvwRFIs.Parent = tabConsentInfoRFI