I have been trying to follow some WCF Data Services examples and have the following code:
private void OnSaveCompleted(IAsyncResult result)
{
Dispatcher.BeginInvoke(() =>
{
context.EndSaveChanges(result);
});
}
Which is called by the following:
this.context.BeginSaveChanges(SaveChangesOptions.Batch, this.OnSaveCompleted, null);
Now I am getting a little confused here. Firstly, the first bit of code is showing a syntax error of
Argument type lambda expression is not assignable to parameter type System.Delegate
So instead of blindly trying to follow the example code, I tried to understand what was going on here. Unfortunately, I am struggling to understand the error plus what is actually happening. Can anyone explain?
I feel a bit stupid as I am sure this is easy.
The problem is that the compiler doesn't know what kind of delegate you're trying to convert the lambda expression to. You can fix that either with a cast, or a separate variable:
private void OnSaveCompleted(IAsyncResult result)
{
Dispatcher.BeginInvoke((Action) (() =>
{
context.EndSaveChanges(result);
}));
}
or
private void OnSaveCompleted(IAsyncResult result)
{
Action action = () =>
{
context.EndSaveChanges(result);
};
Dispatcher.BeginInvoke(action);
}