How can I sort TDictionary by a key of Integer in ascending order in Delphi 2009?
The RTL TDictionaries are not sorted and cannot be sorted (other than by hash, which they are). You need to use another container if you wish to sort either the keys or the values. For example :
program Project1;
{$APPTYPE CONSOLE}
uses
Generics.Collections, Generics.Defaults, SysUtils;
var
LDict : TDictionary<integer, string>;
i, j : integer;
LArray : TArray<integer>;
begin
LDict := TDictionary<integer, string>.Create;
try
// Generate some values
Randomize;
for i := 0 to 20 do begin
j := Random(1000);
LDict.AddOrSetValue(j, Format('The Value : %d', [j]));
end;
WriteLn('Disorder...');
for i in LDict.Keys do
WriteLn(LDict.Items[i]);
// Sort
LArray := LDict.Keys.ToArray;
TArray.Sort<integer>(LArray);
WriteLn('Order...');
for i in LArray do
WriteLn(LDict.Items[i]);
finally
LDict.Free;
end;
Readln;
end.