As a proof of concept, I want to write "Done" in a text box after a check box has been checked and a key has been pressed in a text box (in either order). I would expect this code to handle this, but it writes Done as soon as either event happens. Thanks for your help.
var seq = Observable.FromEvent<EventArgs>(this.checkBox, "CheckedChanged")
.Merge(Observable.FromEvent<KeyPressEventArgs>(this.textBox, "KeyPress"));
seq.Subscribe((unused) => this.resultTextBox.Text = "Done");
You can use Observable.When like so (I've added an additional CheckBox for this example):
var checkChanged = Observable.FromEvent<EventArgs>(this.checkBox, "CheckedChanged");
var check1Changed = Observable.FromEvent<EventArgs>(this.checkBox1, "CheckedChanged");
var keyPress = Observable.FromEvent<KeyPressEventArgs>(this.textBox, "KeyPress");
var plan1 = checkChanged
.And(check1Changed).And(keyPress)
.Then((cc, cc1, kp) => "Done.");
var when = Observable.When(plan1);
when.Subscribe((result) => this.resultTextBox.Text = result);
Also, if you can join other plans together, for example if things can be "done" when either one set of events fire, or also when another set of events fire:
var checkChanged = Observable.FromEvent<EventArgs>(this.checkBox, "CheckedChanged");
var check1Changed = Observable.FromEvent<EventArgs>(this.checkBox1, "CheckedChanged");
var keyPress = Observable.FromEvent<KeyPressEventArgs>(this.textBox, "KeyPress");
var keyPress1 = Observable.FromEvent<KeyPressEventArgs>(this.textBox1, "KeyPress");
var plan1 = checkChanged.And(check1Changed).And(keyPress).Then((cc, cc1, kp) => "Done.");
var plan2 = keyPress.And(keyPress1).Then((kp, kp1) => "Alternate done.");
var join = Observable.When(plan1, plan2);
if you need both events to happen - consider using Zip. Merge will trigger the event if any of merged sources raise it.
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