View source for Template:Language - C Sharp Write Code

==Write Code==
{{WriteCode_Intro|C#|CSharp}}

=== Step One: Step One: Create and Address ===
You will need to declare your Phidget object in your code. For example, we can declare a digital input object like this:
<syntaxhighlight lang=csharp>
DigitalInput ch = new DigitalInput();
</syntaxhighlight>


Next, we can address which Phidget we want to connect to by setting parameters such as ''DeviceSerialNumber''.
<syntaxhighlight lang=cSharp>
ch.DeviceSerialNumber = 496911;
</syntaxhighlight>



Although we are not including it on this page, you should include error handling for all Phidget functions. Here is an example of the previous code with error handling:
<syntaxhighlight lang=cSharp>
try{
  ch = new DigitalInput();
  ch.DeviceSerialNumber = 496911;
}catch(PhidgetException ex){
  Console.WriteLine("Error: " + ex.Description);
}
</syntaxhighlight>

=== Step Two: Open and Wait for Attachment ===
After we have specified which Phidget to connect to, we can open the Phidget object like this:
<syntaxhighlight lang=CSharp>
ch.Open(5000);
</syntaxhighlight>

To use a Phidget, it must be plugged in (attached). We can handle this by calling '''Open(''timeout'')''', which will block indefinitely until a connection is made, or until the timeout value is exceeded. Simply calling ''Open'' does not guarantee you can use the Phidget immediately.

Alternately, you could verify the device is attached by using event driven programming and tracking the attach events.

To use events, we have to modify our code slightly:
<syntaxhighlight lang=CSharp>
ch = new DigitalInput();
ch.Attach += onAttachHandler;
ch.Open(5000);
</syntaxhighlight>

Next, we have to declare the function that will be called when an attach event is fired - in this case the function ''onAttachHandler'' will be called.
<syntaxhighlight lang=CSharp>
void onAttachHandler (object sender, Phidget22.Events.AttachEventArgs e){
  attachedText.Text = "Attached";
}
</syntaxhighlight>

We recommend using this attach handler to set any initialization parameters for the channel such as DataInterval and ChangeTrigger from within the AttachHandler, so the parameters are set as soon as the device becomes available.

=== Step Three: Do Things with the Phidget ===
We recommend the use of event driven programming when working with Phidgets. In a similar way to handling an attach event as described above, we can also add an event handler for a state change event:
<syntaxhighlight lang=csharp>
ch = new DigitalInput();
ch.Attach += onAttachHandler;
ch.StateChange += onStateChangeHandler;
ch.Open();
</syntaxhighlight>

This code will connect a function and an event. In this case, the ''onStateChangeHandler'' function will be called when there has been a change to the devices input. Next, we need to create the ''onStateChangeHandler'' function:
<syntaxhighlight lang=cSharp>
void onStateChangeHandler(object sender, Phidget22.Events.DigitalInputStateChangeEventArgs e) {
    stateText.Text = "State: " + e.State;
}
</syntaxhighlight>

If you are using multiple Phidgets in your program, check out our page on [[Using Multiple Phidgets]] for information on how to properly address them and use them in events.

If events do not suit your needs, you can also poll the device directly for data using code like this:
<syntaxhighlight lang=cSharp>
stateText.Text = "State: " + ch.State;
</syntaxhighlight>

'''Important Note:''' There will be a period of time between the attachment of a Phidget sensor and the availability of the first data from the device. Any attempts to get this data before it is ready will result in an exception. See more information on this on our page for [[Unknown Values]].

====Enumerations====

Some Phidget devices have functions that deal with specific predefined values called enumerations. Enumerations commonly provide readable names to a set of numbered options.

Enumerations with Phidgets in Visual Basic .NET will take the form of '''Phidget22.EnumerationType.Enumeration_Name'''.

For example, specifying a SensorType to use the 1142 for a voltage input would look like:
<syntaxhighlight lang=cSharp>
Phidget22.VoltageSensorType.PN_1142
</syntaxhighlight>
and specifying a K-Type thermocouple for a temperature sensor would be:
<syntaxhighlight lang=cSharp>
Phidget22.ThermocoupleType.K
</syntaxhighlight>
The Phidget error code for timing out could be specified as:
<syntaxhighlight lang=cSharp>
Phidget22.ErrorCode.Timeout
</syntaxhighlight>

=== Step Four: Close and Delete ===
At the end of your program, be sure to close your device.
<syntaxhighlight lang=cSharp>
ch.Close()
</syntaxhighlight>