I have a ComboBox with the following code:
private void comboBox1_TextChanged(object sender, EventArgs e)
{
using (var service = WebServiceHelper.GetCoreService())
{
string physicianXml = service.SearchPhysicians(SessionInfo.Current.ClientCode, SessionInfo.Current.MachineName,
SessionInfo.Current.Username, comboBox1.Text);
var physicians = PhysicianItemList.FromXml(physicianXml);
AutoCompleteStringCollection autoCompleteStringCollection = new AutoCompleteStringCollection();
foreach (var physician in physicians.Items)
{
autoCompleteStringCollection.Add(physician.LastName + ", " + physician.FirstName);
}
comboBox1.AutoCompleteCustomSource = autoCompleteStringCollection;
comboBox1.Select(comboBox1.Text.Length, 0);
}
}
Basically, a user types the first few characters of a physician's name and it should populate the auto-complete list with the top 100 matching records. It works great, but I need to associate it back to a key (either the PK from the table, or the Physician's NPI number). It seems the AutoCompleteStringCollection doesn't support keys. Can anyone suggest a way of doing this? There are approximately 7 million records in the table, so I don't want to prepopulate the ComboBox.
Thanks
When you build your AutoCompleteStringCollection, build a Dictionary<String, int> for the name, id pairs as well. Then use some event (textbox validation or user submit/save click) to lookup and set the id. You could store the dictionary on the textbox Tag.
Edit
For some reason I thought you were working with a textbox control. Forget about the AutoCompleteStringCollection and just build a Dictionary<String, int>. For the combobox set your autocompletesource to ListItems, set the combobox display name and value and set the datasource to the dictionary.
combobox.DisplayMember = "key";
combobox.ValueMember = "value";
combobox.AutocompleteSource = AutocompleteSource.ListItems;
combobox.DataSource = myDictionary;
However you should only populate the datasource and autocomplete once when the user enters n characters in the combobox, otherwise it gets buggy. I tried to use this for a dynamic autocomplete once (eg the list clears if the user clear the text and retypes), but I had to forget about the combobox and use a hybrid textbox listbox approach much like this user
It looks like your problem is that AutoCompleteStringComplete was made specifically for strings (hence, the name).
You may want to look into the parents (IList, ICollection, IEnumerable) and see if you can homebrew something templated toward a key/value struct.
Too late but maybe someone will use this code :
this.AutoCompleteSource = System.Windows.Forms.AutoCompleteSource.ListItems;
this.AutoCompleteMode = System.Windows.Forms.AutoCompleteMode.SuggestAppend;
RNProveedor rnProveedor = new RNProveedor();
var listaProveedores = rnProveedor.Buscar();
Dictionary<int, String> dicTemp = new Dictionary<int, string>();
foreach (var entidad in listaProveedores)
{
dicTemp.Add(entidad.ProvNro, entidad.ProNombre);
}
this.DataSource = new BindingSource(dicTemp, null);
this.DisplayMember = "Value";
this.ValueMember = "Key";
And to select the value
public int GetValorDecimal()
{
KeyValuePair<int, string> objeto = (KeyValuePair<int, string>)this.SelectedItem;
return objeto.Key;
}
With this example you won't have any problem with duplicated strings as the examples above
Related
At the top of the form
Dictionary<string, string> FileList = new Dictionary<string, string>();
In the constructor
public Form1()
{
InitializeComponent();
if (System.IO.File.Exists(Path.Combine(path, "test.txt")))
{
string g = System.IO.File.ReadAllText(Path.Combine(path, "test.txt"));
FileList = JsonConvert.DeserializeObject<Dictionary<string, string>>(g);
listBox1.DataSource = FileList.ToList();
}
instead making :
listBox1.DataSource = FileList.ToList();
and then in the listBox i will see for example "hello", "d:\test\test1.txt"
I want that in the listBox there will be only : "hello"
I don't want to change the FileList but to change what will be adding from the FileList to the listBox and that is only the left side.
another problem might be with the listBox selected index :
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
var item = ((ListBox)sender).SelectedItem;
var itemCast = (KeyValuePair<string, string>)item;
pictureBox1.Image = System.Drawing.Image.FromFile(itemCast.Value);
}
in one hand i don't want to see in the listBox the right side the values in the other hand i want the selected index event to be working.
A dictionary maps keys to values. What you call "left part/side" is actually the key, and the other element is the value.
C# Dictionary has a property: Keys which returns only the keys in the dictionary (e.g. your "hello" string).
Therefore you can use:
listBox1.DataSource = FileList.Keys.ToList();
Note that if you ever need only the values (e.g. "d:\test\test1.txt" etc.), Dictionary has a similar property: Values.
I'm guessing that, when the user selects a key, you're going to want to get the corresponding value. In that case, rather than just binding the keys, bind the whole Dictionary:
myListBox.DisplayMember = "Key"
myListBox.ValueMember = "Value"
myListBox.DataSource = myDictionary.ToArray()
Each item is a KeyValuePair, which has Key and Value properties. The code above will display the keys and then, when the user selects an item, you can get the corresponding value from the SelectedValue property.
Note that data-binding like this requires an IList, while the Dictionary only implements ICollection. For that reason, you need to call ToArray or ToList to create an IList for binding.
Situation: I have 3 TextBoxes, a button and a ComboBox. When I enter something in every TextBox and trigger the button, I want that the strings I've written in the TextBoxes can be choosen in the ComboBox as a ComboBoxItem. I've got the idea of putting the strings from the TextBoxes into a list and refer the ComboBoxItem to the correct list-entrys. Or is there a more efficient way to set and get these strings?
Would be nice if some could help me writing the code for it.
private void bAdd_Click(object sender, RoutedEventArgs e)
{
Random random = new Random();
int randomNumber = random.Next(0, 100);
int txBetrag;
txBetrag = int.Parse(betrag1.Text);
int txMonate;
txMonate = int.Parse(monate1.Text);
int txZins;
txZins = int.Parse(zins1.Text);
List<int> abList = new List<int>();
comboBox.Items.Add("1");
}
If you simply want to add txBetrag, txMonate and txZins to your combobox then you don't need a list. At the moment you're creating a list, adding nothing to it and then simply adding 1 entry to your comboBox (not even from your list).
To add your items just do:
comboBox.Items.Add(int.Parse(betrag1.Text));
comboBox.Items.Add(int.Parse(monate1.Text));
comboBox.Items.Add(int.Parse(zins1.Text));
If you really need the list as well (perhaps because it is used elsewhere as well) then you can do the following:
abList.Add(int.Parse(betrag1.Text));
abList.Add(int.Parse(monate1.Text));
abList.Add(int.Parse(zins1.Text));
Then use the list to populate the comboBox:
foreach(var item in abList)
{
comboBox.Items.Add(item);
}
UPDATE
Based off your comment it seems like you want ONE entry in the comboBox that is effectively the 3 textbox values concatenated together. So you could do something like this:
comboBox.Items.Add(betrag1.Text + monate1.Text + zins1.Text);
UPDATE 2
Following you're last comment regarding the fact that you want 1 comboBox item that refers to the 3 values, but doesn't display them, yes you can do this.
Assuming you won't have duplicate entries in the comboBox you could use a Dictionary to map your values to an entry rather than use a list. I'm assuming here that you will have more than 1 entry in your comboBox eventually, otherwise it's a bit pointless having a combobox.
var valueComboMapping = new Dictionary<string, int[]>();
valueComboMapping.Add("Entry 1", new int[] {int.Parse(betrag1.Text), int.Parse(monate1.Text), int.Parse(zins1.Text)};
This will enable you to add mappings at a later date. You can then use the Dictionary to create the listings in the comboBox like this:
foreach(var entry in valueComboMapping.Keys)
{
comboBox.Items.Add(entry);
}
To trigger an event off selecting an item in the comboBox using the SelectedIndexChanged event.
Retrieving the Values
To retrieve your mapped values in the SelectedIndexChanged event you can do something like:
private void comboBox_SelectedIndexChanged(object sender, System.EventArgs e)
{
ComboBox comboBox = (ComboBox) sender;
string entryName = (string) comboBox.SelectedItem;
//retrieve the values from the dictionary using the value of 'entryName'.
List values = new List<int>();
if (valueComboMapping.TryGetValue(entryName, out values)
{
//do something if the key is found.
}
else
{
//do something else if the key isn't found in the dictionary.
}
}
To get this to work you would need to create the dictionary as follows:
var valueComboMapping = Dictionary<string, List<int>>();
Instead of:
var valueComboMapping = Dictionary<string, int[]>();
You can add directly to combobox,no need to add to list.You are using int.Parse, it will generate Format exception.
private void button1_Click(object sender, EventArgs e)
{
comboBox1.Items.Add(betrag1.Text);
comboBox1.Items.Add(monate1.Text);
comboBox1.Items.Add(zins1.Text);
}
I have a Dictionary<uint, string> and a ComboBox using the style DropDownList, where I bind this dictionary, like:
comboBox1.DataSource = new BindingSource(myDic, null);
comboBox1.DisplayMember = "Value";
comboBox1.ValueMember = "Key";
Now I would like to be able to select an arbitrary item of my dictionary with a button click, so given the bound dictionary items:
Dictionary<uint, string> myDic = new Dictionary<uint, string>()
{
{ 270, "Name1" },
{ 1037, "Name2" },
{ 1515, "Name3" },
};
I have tried:
comboBox1.SelectedItem = myDic[270];
comboBox1.SelectedText = myDic[270];
comboBox1.SelectedValue = myDic[270];
comboBox1.SelectedItem = 270;
comboBox1.SelectedValue = 270;
But none of the above changed the selected item.
How can I change my current selected item by either the key or value of my datasource?
You can do it with a little extension method I found here
Just put this into an extension class.
public static KeyValuePair<TKey, TValue> GetEntry<TKey, TValue>
(this IDictionary<TKey, TValue> dictionary,
TKey key)
{
return new KeyValuePair<TKey, TValue>(key, dictionary[key]);
}
And then you can just set your item like this
comboBox1.SelectedItem = myDic.GetEntry<uint,string>(1515);
The key to this problem is that you have to set the KeyValuePair (and not just the uint or string value/key).
Hope this helps!
This works sufficiently. Not sure about the performance on very large lists, but you probably don't want a huge ComboBox list either.
foreach (var item in myDic)
comboBox1.Items.Add(item.Value); // Populate the ComboBox by manually adding instead of binding
comboBox1.SelectedIndex = comboBox1.Items.IndexOf(myDic[1037]);
The clear issue with this code is the dismissal of the DataSource Binding, which may or may not be okay with you. Perhaps someone else will provide a better answer.
Yesterday looking for, I happened to inquire driving the DataSource, it casts it to BindingSource and discovered that a property "Current" which determines that KeyPar is selected internally from the link. So change the values to test and Bingo !
Dictionary<int,string> diccionario=new Dictionary<int,string>();
diccionario.Add(1,"Bella");
diccionario.Add(2,"Bestia");
this.comboList.DisplayMember = "Value";
this.comboList.ValueMember = "Key";
this.comboList.DataSource = new BindingSource(diccionario, null);
((BindingSource)this.comboList.DataSource).Position=0; // select init
///////Method's change ///////
((BindingSource)this.comboList.DataSource).Position =Convert.ToInt32(value);
Basically I need to populate a listBox's .Text value with a string and its .Value value with an int.
By doing this:
lbUsers.DataSource = new UserManagerBO().GetGlobalUserList();
lbUsers.DataBind();
This assigns a string to both .Value and .Text.
Now I know GetGlobalUserList() returns a string[] which is why I'm getting the behaviour above, so how to go about returning the int values along with the string ones? Maybe go 2D array? And then how to bind those results to the listbox?
Option 1
Let that method return string[] and for value pick SelectedIndex.
Option 2
Create a custom class as Damith answers.
Option 3
A Dictionary<int, string> will suffice.
Dictionary Keys for ListBox Value and Dictionary Values for ListBox Text.
Say this is the dictionary returned by your method
//Adding key value pair to the dictionary
Dictionary<int, string> dStudent = new Dictionary<int, string>();
dStudent.Add(0, "Eena");
dStudent.Add(1, "Meena");
dStudent.Add(2, "Deeka");
dStudent.Add(3, "Tom");
dStudent.Add(4, "Dick");
dStudent.Add(5, "Harry");
dStudent.Add(6, "Yamla");
dStudent.Add(7, "Pagla");
dStudent.Add(8, "Dewana");
dStudent.Add(9, "Guru");
dStudent.Add(10, "Sholay");
Step 2:
Now it's time to bind a Dictionary pair with your listbox. The following code binds to listbox.
//binding to the list
lst.DataTextField = "Value";
lst.DataValueField = "Key";
lst.DataSource = dStudent;
lst.DataBind();
Create custom class with user properties. this can be re used when you deal with Global Users
public class CustomClass()
{
public int ID { get; set; }
public int Name { get; set; }
}
return collection of CustomClass objects from GetGlobalUserList(), you need to change the signature and logic of GetGlobalUserList method. Ones you done that,
lbUsers.DataSource = new UserManagerBO().GetGlobalUserList();
set DataTextField and DataValueField of your listbox
lbUsers.DataTextField = "Name";
lbUsers.DataValueField = "ID";
lbUsers.DataBind();
I wanted to bind a dictionary to a datagridview. Unfortunately Dictionary does not implement the required interface, so instead a created a List>.
Essentially I want this to be bound to a datagridview with datagridviewcomboboxcolumns. With column 1 holding the Key and column 2 holding the value.
I've tried loads of variations, but I can't seem to get this right. I've tried binding to the columns, to individual cells, and to the datagridview itself. Does anybody know how to do this?
EDIT: To clarify it's not binding to the object that's the problem. It seems to binding to the List okay, for example, if I have 4 items in the List, then 4 rows are added, however the values are blank. This is the example code:
additionalMetadata1.dataGridView1.DataSource = animal.AdditionalMetaData;
foreach (DataGridViewRow row in additionalMetadata1.dataGridView1.Rows)
{
DataGridViewCustomComboCell cell = row.Cells[0] as DataGridViewCustomComboCell;
cell.DataSource = animal.AdditionalMetaData;
((DataGridViewCustomComboColumn)additionalMetadata1.dataGridView1.Columns[0]).DisplayMember = "Key";
((DataGridViewCustomComboColumn)additionalMetadata1.dataGridView1.Columns[0]).ValueMember = "Key";
((DataGridViewCustomComboColumn)additionalMetadata1.dataGridView1.Columns[0]).DataPropertyName = "Key";
}
Thanks.
You could use your Dictionary with the following Linq:
dataGridView.DataSource = (from d in dictionary
orderby d.Value
select new
{
d.Key,
d.Value
}).ToList();
This will create an anonymous object that will hold your Key and Value as properties. Be aware that the dictionary is by default not in a particular order.
Try like this
dataGridView1.ColumnCount = 2;
foreach (KeyValuePair<string, string> kvp in dict) {
string[] arow = new string[] { kvp.Key, kvp.Value };
dataGridView1.Rows.Add(arow);
}
or
dataGridView1.DataSource = dict.ToArray();
or
dataGridView1.DataSource = dict.Select((kv => new {
myKeys = kv.Key,
myValues = kv.Value
})).ToArray();