There are a couple generic types in .Net (v2 and later) that make passing functions around as delegates very easy. For functions with return types, there is Func<> and for functions without return types there is Action<>. Both Func and Action can be declared to take from 0 to 4 parameters. For example, Func < … Read more
I’m having a problem with a Windows Form application I’m building in C#. The error is stating “foreach statement cannot operate on variables of type ‘CarBootSale.CarBootSaleList’ because ‘CarBootSale.CarBootSaleList’ does not contain a public definition for ‘GetEnumerator’”. I can’t seem to understand what is causing this. This is the code that is throwing up the error: … Read more
That was the best solution https://docs.microsoft.com/en-us/archive/blogs/hongyes/loop-reference-handling-in-web-api Fix 1: Ignoring circular reference globally (I have chosen/tried this one, as have many others) The json.net serializer has an option to ignore circular references. Put the following code in WebApiConfig.cs file: The simple fix will make serializer to ignore the reference which will cause a loop. However, it … Read more
This can happen if you do not assign a value to a DateTime field when the field does not accept NULL values. That fixed it for me!
The project you have downloaded compiles into a dll assembly and provide a set of classes with implemented functionality. You should add to your solution a new project with Output Type of either Console Application or Windows Application (VS Add Project wizard will offer you different templates of Projects). In the newly added project, you … Read more
The error means that the string you’re trying to parse an integer from doesn’t actually contain a valid integer. It’s extremely unlikely that the text boxes will contain a valid integer immediately when the form is created – which is where you’re getting the integer values. It would make much more sense to update a and b in the … Read more
Shuffle any (I)List with an extension method based on the Fisher-Yates shuffle: Usage: The code above uses the much criticised System.Random method to select swap candidates. It’s fast but not as random as it should be. If you need a better quality of randomness in your shuffles use the random number generator in System.Security.Cryptography like so: A simple … Read more
This can happen if you execute a query while iterating over the results from another query. It is not clear from your example where this happens because the example is not complete. One thing that can cause this is lazy loading triggered when iterating over the results of some query. This can be easily solved … Read more
This is because of name Conflict of Class (Model) names with other reserved or generated ones, when auto creates the tables and … . Considering that EF Code First creates the intervene tables to relate 2 or more tables using name of tables for derived intervene table, so when you use a class name that employs a … Read more