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wcfexceptionnamed-pipes

Check if WCF(namedpipes) host is available?

Hi,

We have a winform application that is only to be executed as a singelton, If a second instance try to start this new instance will connect to the current and transmit parameters over namedpipes.

The problem is that when starting the first instance there will be a try to connect to existing host. If the host is not existing(like in this case) an exception will be thrown. There is no problem to handle this exception but our developers is often using "Break on Exception" and that means that every time we startup the application the developer will get two(in this case) breaks about exception. Thay will have to hit F5 twice for every start.

Is there any way to check if the service is available without throw exception if its not?

BestRegards

Edit1: 

[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool CloseHandle(IntPtr hObject);

[DllImport("kernel32.dll", SetLastError = true)]
static extern IntPtr OpenFileMapping(uint dwDesiredAccess, bool bInheritHandle, string lpName);

The following code says : Error 152 Cannot implicitly convert type 'System.IntPtr' to 'Orbit.Client.Main.Classes.Controllers.MyClientController.SafeFileMappingHandle'

using (SafeFileMappingHandle fileMappingHandle
                = OpenFileMapping(FILE_MAP_READ, false, sharedMemoryName))
            {
Solution

  • My solution is the following :

    if (Debugger.IsAttached) 
return true;

    This will make sure that the code for checking the service is never runned during debugging.

    BestRegards