System.Collections.Generic.Dictionary
This type of collection represents a collection on keys and values
Every value has a unique key associated with it.
Objects made available through unique keys.
You can indicate the data type of both the key and value at declaration
Items are stored through the related KeyValuePair class
DictionaryEntry is actually a KeyValuePair
This is built-in when you have a dictionary
Different types of key,pairs
String Items - System.Collections.Generic.Dictionary(Of String, String) - These are referenced in code as Dictionary
String Array Items - System.Collections.Generic.Dictionary(Of String, String()) - These are referenced in code as Dictionary Arrays
Group of Strings
System.Collections.Generic.Dictionary<string, string> dicAuthors;
dicAuthors = new System.Collections.Generic.Dictionary<string, string>();
dicAuthors.Add(key, value);
dicAuthors.Add("001", "my first string");
dicAuthors.Add("002", "my second string");
Dim dicAuthors As System.Collections.Generic.Dictionary(Of String, String)
dicAuthors = New System.Collections.Generic.Dictionary(Of String, String)
dicAuthors.Add(key, value)
dicAuthors.Add("001", "my first string")
dicAuthors.Add("002", "my second string")
Group of String Arrays
System.Collections.Generic.Dictionary<string, string[]> adicAuthors;
adicStrings = new System.Collections.Generic.Dictionary<string, string[]>();
adicStrings.Add(key,value);
adicStrings.Add("Item1", ??);
Dim adicStrings As New System.Collections.Generic.Dictionary(Of String, String())
adicStrings = New System.Collections.Generic.Dictionary(Of String, String())
adicStrings.Add(key,value)
adicStrings.Add("Item1", ??)
Group of DataGridViewRows
System.Collections.Gernic.Dictionary<int, System.Windows.Forms.DataGridViewRow> dicRows;
dicRows = new System.Collections.Generic.Dictionary<int, System.Windows.Forms.DataGridView>();
dicRows.Add(key,value)
dicRows.Add(objdatagridview.cells(0).rowindex, objdatagridviewrow)
Dim dicRows As System.Collections.Generic.Dictionary(Of Integer, System.Windows.Forms.DataGridViewRow)
dicRows = New System.Collections.Generic.Dictionary(Of Integer, System.Windows.Forms.DataGridViewRow)
dicRows.Add(key,value)
dicRows.Add(objdatagridview.cells(0).rowindex, objdatagridviewrow)
Group of Objects
System.Collections.Generic.Dictionary<string, MyObject>();
dicObjects = new System.Collections.Generic.Dictionary<string, MyObject>();
Dim dicObjects As System.Collections.Generic.Dictionary(Of String, MyObject)
dicObjects = New System.Collections.Generic.Dictionary(Of String, MyObject)
Looping Through Elements
foreach (System.Collections.Generic.KeyValuePair<int, string> objKeyValuePair in dicItems)
{
Debug.Print objKeyValuePair.Key + " - " + objKeyValuePair.Value;
}
Dim objKeyValuePair As System.Collections.Generic.KeyValuePair(Of Integer, String)
For Each objKeyValuePair In dicItems
Debug.Print objKeyValuePair.Key & " - " & objKeyValuePair.Value
Next objKeyValuePair
For icount As Integer = 0 To adicAuthors.Count
skey = adicAuthors.ElementAt(icount).Key
Next icount
Dim snamesarray As System.String
snamesarray = dicAuthors.ToArray
For icount As Integer = 0 To (dicAuthors.Count - 1)
snamesarray.GetValue(icount)
Next icount
You can also obtain a collection from the Dictionary
KeyCollection
ValueCollection
Does an Element Exist
If dicAuthors.Keys.Contains("002"
If dicAuthors.ContainsKeys("002") = True Then
End If
Removing an Element
dicAuthors.Remove(key)
dicAuthors.Remove("001")
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