C# – Vector Graphics on Windows Mobile

You can use std::find from <algorithm>:

#include <algorithm>
#include <vector>
vector<int> vec; 
//can have other data types instead of int but must same datatype as item 
std::find(vec.begin(), vec.end(), item) != vec.end()

This returns a bool (true if present, false otherwise). With your example:

#include <algorithm>
#include <vector>

if ( std::find(vec.begin(), vec.end(), item) != vec.end() )
   do_this();
else
   do_that();

Windows Presentation Foundation 4.5 Cookbook by Pavel Yosifovich on page 155 in the section on "Using the common dialog boxes" says:

"What about folder selection (instead of files)? The WPF OpenFileDialog does not support that. One solution is to use Windows Forms' FolderBrowseDialog class. Another good solution is to use the Windows API Code Pack described shortly."

I downloaded the API Code Pack from Windows® API Code Pack for Microsoft® .NET Framework Windows API Code Pack: Where is it?, then added references to Microsoft.WindowsAPICodePack.dll and Microsoft.WindowsAPICodePack.Shell.dll to my WPF 4.5 project.

Example:

using Microsoft.WindowsAPICodePack.Dialogs;

var dlg = new CommonOpenFileDialog();
dlg.Title = "My Title";
dlg.IsFolderPicker = true;
dlg.InitialDirectory = currentDirectory;

dlg.AddToMostRecentlyUsedList = false;
dlg.AllowNonFileSystemItems = false;
dlg.DefaultDirectory = currentDirectory;
dlg.EnsureFileExists = true;
dlg.EnsurePathExists = true;
dlg.EnsureReadOnly = false;
dlg.EnsureValidNames = true;
dlg.Multiselect = false;
dlg.ShowPlacesList = true;

if (dlg.ShowDialog() == CommonFileDialogResult.Ok) 
{
  var folder = dlg.FileName;
  // Do something with selected folder string
}