I have a bunch of strings I need to use .Trim() on, but they can be null. It would be much more concise if I could do something like: string endString = startString !?? startString.Trim(); Basically return the part on the right if the part on the left is NOT null, otherwise just return the null value. I just ended up using the terna...
null coalescing translates roughly to return x, unless it is null, in which case return y I often need return null if x is null, otherwise return x.y I can use return x == null ? null : x.y; Not bad, but that null in the middle always bothers me -- it seems superfluous. I'd prefer something like return x :: x.y;, where what follows th...
We wanted to assign/add an item to a Dictionary using the key index, like this: Dictionary<string, object> dict = new Dictionary<string, object>(); dict["key"] = dict["key"] ?? "object"; But it results to: "The given key was not present in the dictionary." Is there any way we could assign values to this dictionary the same as the way...
Hello, take a look at the following code I attempted to write inside a constructor: private Predicate<string> _isValid; //... Predicate<string> isValid = //...; this._isValid = isValid ?? s => true; The code doesn't compile - just "invalid expression term"s and so one. In contrast that does compile and I could just use it: this._...
Recently I had a weird bug where I was concatenating a string with an int? and then adding another string after that. My code was basically the equivalent of this: int? x=10; string s = "foo" + x ?? 0 + "bar"; Amazingly enough this will run and compile without warnings or incompatible type errors, as will this: int? x=10; string s ...
I have defined Class Person property Birthday as nullable DateTime? , so why shouldn’t the null coalescing operator work in the following example? cmd.Parameters.Add(new SqlParameter("@Birthday", SqlDbType.SmallDateTime)).Value = person.Birthday ?? DBNull.Value; The compiler err I got was "Operator '??' cannot be appl...
I need to add numerous variables of type nullable int. I used the null coalescing operator to get it down to one variable per line, but I have a feeling there is a more concise way to do this, e.g. can't I chain these statements together somehow, I've seen that before in other code. using System; namespace TestNullInts { class Prog...
Hey All Trying to figure out how to get the null coalescing operator to work in a foreach loop. I'm checking to see what a string ends with and based on that, route it to a certain method. Basically what I want to say is.... foreach (String s in strList) { if s.EndsWith("d") ?? Method1(s) ?? Method2(s) ?? "Unknown file type"; } ...
Possible Duplicate: What is the ?? operator for? What does the ?? notation mean here? Am I right in saying: Use id, but if id is null use string "ALFKI" ? public ActionResult SelectionClientSide(string id) { ViewData["Customers"] = GetCustomers(); ViewData["Orders"] = GetOrdersForCustomer(id ?...
I think i remember seeing something similar to the ?: ternary operator in C# that only had two parts to it and would return the variable value if it wasn't null and a default value if it was. Something like this: tb_MyTextBox.Text = o.Member ??SOME OPERATOR HERE?? "default"; Basically the equivalent of this: tb_MyTextBox.Text = o.Me...
When this code finishes, what is the result of myObject? object myObject = "something"; object yourObject = null; myObject = null ?? yourObject; ...