IIf is an actual function, so all arguments get evaluated. The If keyword was added to VB.NET 2008 to provide the short-circuit functionality you’re expecting. Try logLine = “e.Value: ” + If(e.Value Is Nothing, “”, e.Value.ToString())
Similar to Sandeep’s answer, I also updated the cookie authentication provider. Except, instead of swallowing the error I threw the exception so you could see what the underlying problem was: app.UseCookieAuthentication(new CookieAuthenticationOptions { AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie, LoginPath = new PathString(“/Account/Login”), Provider = new CookieAuthenticationProvider { // Enables the application to validate the security stamp when … Read more
Edit: The problem is that you used Short variable declaration := and you just stored the created *DB value in a local variable and not in the global one. This line: db, err := NewDB(dbinfo) Creates 2 local variables: db and err, and this local db has nothing to do with your global db variable. … Read more
I agree with the other answerers who say that this looks like a bug. Specifically it appears to be a bug in C# runtime binding layer, though I have not investigated it thoroughly. I apologize for the error. I’ll report it to the C# 5 testing team and we’ll see if it has already been … Read more
You need to initialize the list first: protected List<string> list = new List<string>();
It is almost certainly a threading issue – see this question and its accepted answer. Dictionary<>.Insert() will throw a NullReferenceException internally if the dictionary instance is modified from another thread during the insert operation.
In C# 6 you can use the Null Conditional Operator. So the original test will be: int? value = objectA?.PropertyA?.PropertyB?.PropertyC;
Somewhere inside the DbContext is a value that is IEnumerable and is queried with Any() (or Where() or Select() or any other LINQ-method), but this value is null. Find out if you put a query together (somewhere outside your example code) where you are using a LINQ-method, or that you used an IEnumerable as a … Read more
with csc test.cs: (196c.1874): Access violation – code c0000005 (first chance) mscorlib_ni!System.RuntimeType.GetConstructorImpl(System.Reflection.BindingFlags, System.Reflection.Binder, System.Reflection.CallingConventions, System.Type[], System.Reflection.ParameterModifier[])+0xa3: 000007fe`e5735403 488b4608 mov rax,qword ptr [rsi+8] ds:00000000`00000008=???????????????? Trying to load from [rsi+8] when @rsi is NULL. Lets inspect the function: 0:000> ln 000007fe`e5735403 (000007fe`e5735360) mscorlib_ni!System.RuntimeType.GetConstructorImpl(System.Reflection.BindingFlags, System.Reflection.Binder, System.Reflection.CallingConventions, System.Type[], System.Reflection.ParameterModifier[])+0xa3 0:000> uf 000007fe`e5735360 Flow analysis was incomplete, some code may … Read more
Variables in .NET are either reference types or value types. Value types are primitives such as integers and booleans or structures (and can be identified because they inherit from System.ValueType). Boolean variables, when declared, have a default value: bool mybool; //mybool == false Reference types, when declared, do not have a default value: class ExampleClass … Read more