enter image description hereI have used AutoSize/FixedDialog/GrowAndShrink combo before to set Formsize depending on the label size responsible for printing the Queryresult out. In this case I have done everything in the same way but the Shrink part is not functioning at all.
The label is also set AutoSize. Maximum size is determined, to have only the height autosized.
I have checked ten times all of the properties human can set and the difference between the former Forms and the one I have problem with. The conclusion:No difference (Instead of two little things (margin size and minimum size)).
I use property window when is it possible, so I can not present any code to this question.
I would like to now what is wrong in my thinking or what shoud I do more. It is a good answer for me that: Forget about the property window! Code! You want to be a developer.
public partial class Form1 : Form
{
public class QuerySelection
{
public string Name { get; set; }
public string Query { get; set; }
public QuerySelection(string name, string query)
{
Name = name;
Query = query;
}
public override string ToString()
{
return Name;
}
}
public Form1()
{
InitializeComponent();
}
private void buttonCancel_Click(object sender, EventArgs e)
{
this.Close();
}
const string QueryText1 = "This is the short selection!";
const string QueryText2 = "This is the middle-long selection!";
const string QueryText3 = "This is the long selection!";
const string Query1 = "short";
const string Query2 = "middle-short";
const string Query3 = "long";
const string ErrorText = "Choose a query!";
private void Form1_Load(object sender, EventArgs e)
{
comboBoxQueries.Items.Add(new QuerySelection(QueryText1, Query1));
comboBoxQueries.Items.Add(new QuerySelection(QueryText2, Query2));
comboBoxQueries.Items.Add(new QuerySelection(QueryText3, Query3));
}
private void buttonSelectedQueryResult_Click(object sender, EventArgs e)
{
QuerySelection selectedItem = (QuerySelection)comboBoxQueries.SelectedItem;
if(comboBoxQueries.SelectedItem == null)
{
MessageBox.Show(ErrorText);
}
else
{
labelResult.Text = selectedItem.Query;
}
}
}
}
Related
I am new to xamarin forms and I am trying to make a project similar to what you can see in the next picture.
photo
The thing I want to achieve is when I press an item from listView (which I already have with the items displayed) where I have all items I want to pass somehow the entire object to the tabPage so that I can see the description in one part and the opinions in the other page. I did some research but all the examples I saw uses MVVM and mine is more simple than that.
Here you have the code.
--->Model
public class Item
{
public String name;
public String description;
public Double price;
public int stock;
public List<String> opinions;
public Item(String name, String description ,Double price, int stock, List<String> opinions)
{
this.name = name;
this.description = description;
this.price = price;
this.stock = stock;
this.opinions = opinions;
}
public override string ToString()
{
return this.name + " " + this.price + " $" + this.stock + " ud";
}
}
---> The event that takes me to the TabPage.
private async void parent_listView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
//here maybe I should pass the object...
await Navigation.PushAsync(new TabPage());
}
---> Here you have both classes that are used inside the tabPage
public partial class Datos : ContentPage
{
//private string descriptionList;
public Datos()
{
InitializeComponent();
}
}
public partial class Opinions : ContentPage
{
public Opinions()
{
InitializeComponent();
}
}
The thing is that I don't know how to pass the object in a specific position from listView to both pages from tabPage in a easy way. I tried to pass both classes(Datos and Opinions) using TabPage constructor but it doesn't work. Here you have the code...
private async void parent_listView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
await Navigation.PushAsync(new TabPage(new Datos(itemList[e.SelectedItemIndex] ), new Opinions(itemList[e.SelectedItemIndex] )));
}
SelectedItemChangedEventArgs contains a reference to the selected object
private async void parent_listView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
var item = (Item)e.SelectedItem;
await Navigation.PushAsync(new TabPage(item));
}
I'm very new to c#, I started a few days ago, so please excuse me if it is basic.
I have two forms, the first one is like a login page, where someone enters their name. On my "Info.cs" class, it reads this name via a setter, into a variable, and my Getter called "GetCardName" returns this Name. I now made a new form where I want to access this name via the GetCardName getter, just dont know how too. Heres the code :
Here is some of the "info.cs" class code:
private string CardName { get; set; } = "";
public string GetCardName()
{
return this.CardName;
}
public void SetName(string name = "")
{
this.CardName = name;
}
And here is the code from the other form that is just trying to call GetCardName():
private void Form2_Load(object sender, EventArgs e)
{
lblWelcome.Text = Info.GetCardName();
}
When creating Form2 you need also pass it reference to the other form to get its properties.
So when creating and showing Form1 you should also create Form2 to pass that reference. Example (not tested) code:
var form1 = new Form1();
var form2 = new Form2(form1);
form1.Show();
and Form2 should be like:
public class Form2
{
private Form1 _form1;
public Form2(Form1 form1)
{
_form1 = form1;
// ... other initialization code
}
// ... other class declarations
}
General solution is: you need to persist reference to the Form1 being shown to the user and then pass that reference to Form2 whenever you create it.
You have two options :
you can create an instance of the class that you want to call
EX : Info infoVar = new Info(); (now you can use infoVar to call any methods of the Info.cs class)
you can make Info class a STATIC class (probably not what you want to do, but still helpful for the future perhaps) This makes it possible to call the info class directly without having to create a variable of that class but has some drawbacks. (more info here)
There is few ways to achieve what you want:
Public static property:
public class Info
{
public static string CardName { get; set; } = string.Empty;
}
You can access it or set value to it directly by:
private void Form2_Load(object sender, EventArgs e)
{
// Set
Info.CardName = "Some name";
// Get
lblWelcome.Text = Info.CardName;
}
Public non-static property:
public class Info
{
public string CardName { get; set; } = string.Empty;
}
You can access it or set value to it directly too, but need to create Info class instance before:
private void Form2_Load(object sender, EventArgs e)
{
Info info = new Info();
// Set
info.CardName = "Some name";
// Get
lblWelcome.Text = info.CardName;
}
Private static field with separated public static Get and Set methods:
public class Info
{
private static string cardName = string.Empty;
public static string GetCardName()
{
return cardName;
}
public static void SetCardName(string name = "")
{
cardName = name;
}
}
You can access GetCardName and SetCardName without creating Info class instance:
private void Form2_Load(object sender, EventArgs e)
{
// Set
Info.SetCardName("Some name");
// Get
lblWelcome.Text = Info.GetCardName();
}
Private non-static field with separated public non-static Get and Set methods:
public class Info
{
private string cardName = string.Empty;
public string GetCardName()
{
return cardName;
}
public void SetCardName(string name = "")
{
cardName = name;
}
}
You can access GetCardName and SetCardName after creating Info class instance:
private void Form2_Load(object sender, EventArgs e)
{
Info info = new Info();
// Set
info.SetCardName("Some name");
// Get
lblWelcome.Text = info.GetCardName();
}
Difference between fields and properties was pretty nice explained here: What is the difference between a field and a property?. In short, properties are "wrappers" over fields, which usually are private and you can't access to them directly or modify. It is a part of Member Design Guidelines. Also properties allow to add some validations through property setter to be sure that valid value is stored at cardName field, e.g.:
public class Info
{
private string cardName = string.Empty;
public string CardName
{
get => cardName;
set
{
// Check that value you trying to set isn't null
if (value != null)
cardName = value;
// Or check that name is not too short
if (value.Length >= 3) // Card name should be at least of 3 characters
cardName = value;
}
}
}
info myInfo=new info();
lblWelcome.Text = myInfo.GetCardName();
I'm trying a code which changes the TextBox values when variable mapped with it changes accordingly without using TextBox changed event. I am not finding any clue to where to start please help me.
Here is the code:
public void varChange(TextBox text)
{
String name;
name="sachin";
text.Text = name;
MessageBox.Show("" + text.Text);
}
You can "extend" TextBox :
public class MeTextBox : TextBox
{
public override string Text
{
get
{
return base.Text;
}
set
{
//base.Text = value; // use it or not .. whatever
MyTextWasChanged();
}
}
void MyTextWasChanged()
{
String name;
name="sachin";
//text.Text = name;
base.Text = name;
MessageBox.Show("" + text.Text);
}
}
If that's not what you're looking for then give some more details and I'll update this answer.
You can use a BindingSource
public partial class Form1 : Form
{
private System.Windows.Forms.BindingSource form1BindingSource;
public string BindedProp { get; set; } //Variable or property binded with TextBox
public Form1()
{
InitializeComponent();
this.form1BindingSource = new System.Windows.Forms.BindingSource(new System.ComponentModel.Container());
this.form1BindingSource.DataSource = typeof(binding.Form1);
this.textBox.DataBindings.Add(new System.Windows.Forms.Binding("Text", this.form1BindingSource, "BindedProp", true));
this.form1BindingSource.DataSource = this;
}
//add a button control to assing value code event click
private void btAssingValueProperty_Click(object sender, EventArgs e)
{
BindedProp = "Value assigned";
form1BindingSource.ResetBindings(false);
}
//add a other button control to show value code event click
private void btShowValueProperty_Click(object sender, EventArgs e)
{
MessageBox.Show(BindedProp);
}
}
I have a Class where there a 2 variables int ID and string name. I made a list of several objects and loaded them onto a listbox. The listbox only show the name. Is there a way to retrieve the ID from the listbox?
class Show
{
private int _Id;
private string _Naam;
private string _Genre;
public override string ToString()
{
return Naam;
}
}
from a database i make a list of objects.
private void bttn_zoek_Click(object sender, EventArgs e)
{
foreach (object a in List<show> List)
{
listbox1.Items.Add(a);
}
}
I hope this is enough
Assuming WinForms, here is a super simple example of overriding ToString() to control how the class is displayed in the ListBox, and also how to cast the selected item in the ListBox back to your class type so you can extract values from it. There are other ways to accomplish this task, but you should understand a bare bones example like this first:
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
SomeClassName sc1 = new SomeClassName();
sc1.ID = 411;
sc1.Name = "Information";
listBox1.Items.Add(sc1);
SomeClassName sc2 = new SomeClassName();
sc2.ID = 911;
sc2.Name = "Emergency";
listBox1.Items.Add(sc2);
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (listBox1.SelectedIndex != -1)
{
SomeClassName sc = (SomeClassName)listBox1.Items[listBox1.SelectedIndex];
label1.Text = "ID: " + sc.ID.ToString();
label2.Text = "Name: " + sc.Name;
}
}
}
public class SomeClassName
{
public int ID;
public string Name;
public override string ToString()
{
return ID.ToString() + ": " + Name;
}
}
Posting some of your code would be nice. Have you tried listBox.items[index].ID?
Here I'm assuming that index is whatever index you're currently searching for.
You can also try listBox.SelectedItem[index].ID if you're doing something like an event.
Hi, I am a newbie to C# and I have no programming background, but I am interested in it.
I want to send data to a ListView, but the data is in the other form. I already saw all the related posts here. I tried copying code from one of the post and changing it according to my needs, but it doesn't work.
Form3:
public partial class Form3 : Form
{
public Form3()
{
InitializeComponent();
}
public delegate void HandleItemAdded(object sender, ItemAddedEventArgs e);
public struct ItemAddedEventArgs: EventArgs
{
public string PartPrefix;
public string PartStartNumber;
public string AssemblyPrefix;
public string AssemblyStartNumber;
public string Name;
public string Profile;
public string Material;
public string Finish;
public string Class;
public ItemAddedEventArgs(string partprefix, string partstartnumber, string assemblyprefix, string assemblystartnumber, string name, string profile, string material, string finish, string classes)
{
PartPrefix = partprefix;
PartStartNumber = partstartnumber;
AssemblyPrefix = assemblyprefix;
AssemblyStartNumber = assemblystartnumber;
Name = name;
Profile = profile;
Material = material;
Finish = finish;
Class = classes;
}
}
public event HandleItemAdded ItemAdded;
public void RaiseItemAdded(ItemAddedEventArgs e)
{
if (ItemAdded != null)
ItemAdded(this, e);
}
public void AddToList()
{
RaiseItemAdded (new ItemAddedEventArgs (textBox221.Text, textBox222.Text, textBox223.Text, textBox224.Text, textBox225.Text, textBox226.Text, textBox227.Text, textBox228.Text, textBox229.Text));
}
}
Form1:
public void HandleItemAdded(object sender, WindowsFormsApplication1.Form3.ItemAddedEventArgs e)
{
ListViewItem item1 = new ListViewItem(textBox221.Text);
item1.SubItems.Add(textBox222.Text);
item1.SubItems.Add(textBox223.Text);
item1.SubItems.Add(textBox224.Text);
item1.SubItems.Add(textBox225.Text);
item1.SubItems.Add(textBox226.Text);
item1.SubItems.Add(textBox227.Text);
item1.SubItems.Add(textBox228.Text);
item1.SubItems.Add(textBox229.Text);
listView1.Add(item1);
Form3.ItemAdded += Form1.HandleItemAdded; *<-( i dont know if this is the correct place for this.)
}
The error I get is: type EventArgs in interface list is not an interface
Thank you in advance.
What you need to do in Form1 is this:
public void HandleItemAdded(object sender, WindowsFormsApplication1.Form3.ItemAddedEventArgs e)
{
ListViewItem item1 = new ListViewItem(e.PartPrefix);
item1.SubItems.Add(e.PartStartNumber);
item1.SubItems.Add(e.<Member_Name>);
.
.
.
listView1.Add(item1);
}
And for the error I think following should work for you:
public class ItemAddedEventArgs: EventArgs