I have some list and I do list.ForEach( l => { ... something ...}). Now, on certain condition I need to stop iterating over the list, but break doesn't work - I get "Control cannot leave the body of an anonymous method or lambda expression" compilation error.
Any idea how to overcome that restriction?
Using break alone won't work here because the lambda executes in a different method than the for loop. A break statement is only useful for breaking out of constructs local to the current function.
In order to support a break style leave you'd need to add an overload of ForEach where the delegate can specify via a return value that loop execution should break. For example
public static void ForEach<T>(this IEnumerable<T> enumerable, Func<T, bool> func) {
foreach (var cur in enumerable) {
if (!func(cur)) {
break;
}
}
}
Now a consumer of this ForEach method can specify a break by returning false from the provided callback
myCollection.ForEach(current => {
if (someCondition) {
// Need to break
return false;
}
// Keep going
return true;
}