I wrote previously a post where I combine 2 Lists together here. Recently, I had the requirement to join 2 dictionaries together. I needed to build a DataTable and an NHibernate HQL query dynamically where the column headings could be different than the name of the actual database column name. To do this I created […]
Read More →I needed to create an executable which would run as a job triggered from a scheduler. I decided to create a Console application, using, of course C#. I wanted it to run without the Console window popping up. I asked myself, how do I stop the console window from popping up or how do I […]
Read More →The other day I needed to implement a search function in a WPF program. I wanted the use to be able to enter the criteria and then the enter key to perform the search. I achieved this by adding a KeyDown event to the text box control in the XAML. KeyDown=”textBox1_KeyDown” And adding the below […]
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In .NET Framework 4, C# supports covariance and contravariance in generic interfaces and delegates. However, if you try to implement either in a class, you will receive an exception. Trying to implement covariance in a return type or overriding a method and attempting to return a different type will not work. Let’s discuss below. public […]
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I liked this concept because it seems kind of sneaky. By that I mean, in the past I was only able to call a method from a base class via inheritance or creating an instance of the class itself. However, now by implementing a generic type parameter we can achieve the same thing. First we […]
Read More →In a previous blog I discussed how to use and implement an interface with generics. I decided shortly after that it would be a good idea, in my context, to loosely bind a type to the interface. In the previous blog, it was left 100% generic and that was fine for the example. However, there […]
Read More →I once had a requirement that I needed to dynamically build a select statement, based on a users selection and then display the results in a DataGrid. The tricky part was that the column name in the select portion of the query was not always the name I needed to show as the column heading […]
Read More →DLL Hell. Enough said, well maybe not. Before .NET every installation of a new version of a program or the installation of any program was a gamble. There was always a risk that a necessary component required to run the new version would overwrite a component which is used by another causing the old program […]
Read More →I wanted to create an interface; however one of the methods I wanted to implement in it had a class as a parameter. I thought about it and realized that be doing so I would be tightly binding my interface to a specific class. I didn’t think that was good practice because interfaces need to […]
Read More →There is a pretty basic reason why this error happens. However, until you find the solution, it is a big deal. I was creating a simple base class like the below which I planned on extending in another class. public class TreeViewModel : INotifyPropertyChanged { TreeViewSelector() { } } However, when I tried to […]
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