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...
Related
I am working with form and I would like to introduce like a table where I can select differents options.
And example would be this:
In this picture, there are two attributes, Código and Nombre. I get this information from a database. My problem is that I don't know how can I put all that information (Código and Nombre) in the middle of the form and then give the option to choose one.
My InitializeComponent is the following:
private void InitializeComponent()
{
this.button3 = new System.Windows.Forms.Button();
this.btnCancelar = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// button3
//
this.button3.Location = new System.Drawing.Point(12, 226);
this.button3.Name = "button3";
this.button3.Size = new System.Drawing.Size(75, 23);
this.button3.TabIndex = 0;
this.button3.Text = "button3";
this.button3.UseVisualStyleBackColor = true;
this.button3.Click += new System.EventHandler(this.button3_Click);
//
// Cancelar
//
this.btnCancelar.Location = new System.Drawing.Point(197, 226);
this.btnCancelar.Name = "btnCancelar";
this.btnCancelar.Size = new System.Drawing.Size(75, 23);
this.btnCancelar.TabIndex = 1;
this.btnCancelar.Text = "&Cancelar";
this.btnCancelar.UseVisualStyleBackColor = true;
this.btnCancelar.Click += new System.EventHandler(this.btnCancelar_Click);
//
// FormEmpresas
//
this.ClientSize = new System.Drawing.Size(284, 261);
this.Controls.Add(this.btnCancelar);
this.Controls.Add(this.button3);
this.Name = "FormEmpresas";
this.ResumeLayout(false);
}
Do not modify InitializeComponents. The Designer works on one part - this function. You work on another part - the one with constructor. If you modify the Designer part, you will just get the GUI or Compilzer seizing up because you changed the Designer part. Change your part and only your part.
Getting the Information is a simple SQL Select. Make sure you retrieve (but do not nessesarily show) the primary key. Such a UI is usually about getting the Primary Key for further Queries from the user, without nessesarily telling him about the Key (the user is mostly intersted on all the other rows of that Table).
Such a query should be started earliest in the Shown() or Activated() events for the form. Ealier is prone to cause issues with stuff not being properly there yet. Also ideally this query should involve some Async processing down the line. DB Queries are notorious for be long running operations and long running + GUI do not mix so well. But for simple test, the non-async way works well.
General Design notes: This looks like a Modal OK/Cancel Dialog with a single ListView Element. Modal Dialogs are just Forms shown with ShowDialog().
I believe that DataGridView should be enough. There's plenty of examples and tutorials, starting with MSDN one through some tips related to the control and finally more complex examples (not necessarily for DGV only) with data binding.
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 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.
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.
I have a WinForms form with a few text boxes on it. I need to change some of them to a custom version of TextBox (I had to override a function). Since the whole new control is just this one function, I just did it all in a few lines of code in same as a contained-class in my form. Now I want to change the instance of the designer-generated text box to an instance of this one in the code. Can this be done somehow?
If it can't, and I have to add a whole new UserControl item to my project, can I at least substitute it in the designer without losing all my property changes and event handler bindings?
Description
Check out the <YourFormName>.Designer.cs file. This is the file the Designer has created. You can change your TextBox to your custom this way.
Sample
#region Windows Form Designer generated code
private void InitializeComponent()
{
// change this
this.textBox1 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(0, 0);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(100, 20);
this.textBox1.TabIndex = 0;
//
// Form1
//
// ...
}
#endregion
// change this
private System.Windows.Forms.TextBox textBox1;
Go to the InitializeComponent() method inside your form class or the form's designer.cs class. In this method, you would find the usage of your textbox controls, now go to the definition of those usages and change the type of the textbox variables to your custom implemented textbox types.