| Description |
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The ContainsKey method searches the current HashTable for an entry matching Key, returning true if found, otherwise false.
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| | Notes | This is identical in operation to the Contains method.
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| Microsoft MSDN Links |
System.Collections
System.Collections.HashTable
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| A simple example |
program Project1;
{$APPTYPE CONSOLE}
uses
System.Collections;
var
MyTable : System.Collections.HashTable;
DictEntry : DictionaryEntry;
Enumerator : IEnumerator;
begin
// Create our hash table
MyTable := HashTable.Create;
// Add entries to it
MyTable['Name'] := 'Neil Moffatt';
MyTable['Birthday'] := DateTime.Create(1957, 2, 18);
MyTable['Age'] := TObject(47);
// Display the table contents
Console.WriteLine('MyTable at the start :');
Console.WriteLine;
Enumerator := MyTable.GetEnumerator;
while Enumerator.MoveNext do
begin
// Note that entries are returned in key sorted order
DictEntry := DictionaryEntry(Enumerator.Current);
Console.WriteLine('{0} = {1}',
DictEntry.Key.ToString,
DictEntry.Value.ToString);
end;
Console.WriteLine;
if MyTable.ContainsKey('Age')
then Console.WriteLine('MyTable contains key ''Age''')
else Console.WriteLine('MyTable does not contain key ''Age''');
if MyTable.ContainsKey('AGE')
then Console.WriteLine('MyTable contains key ''AGE''')
else Console.WriteLine('MyTable does not contain key ''AGE''');
Console.Readline;
end.
| | Show full unit code | MyTable at the start :
Birthday = 18/02/1957 00:00:00
Age = 47
Name = Neil Moffatt
MyTable contains key 'Age'
MyTable does not contain key 'AGE'
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