Tag Archives: .Net

Passing a String Where It Isn’t Expected:
Exploring the Implicit Conversion Alternative

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Let’s say you maintain a class whose constructor expects a configuration object:

class MyDbConnection {
  public MyDbConnection(MyDbConfiguration config) { … }
}
...
var config = new MyDbConfiguration { Server = "SuperFastDbServer", User = "jsmith", Password = … };
var connection = new MyDbConnection(config);

Along the way, developers asked for a simple, textual way to set configuration options. To accommodate this, you gave the configuration class a constructor that accepts a settings string as its argument:

var connection = new MyDbConnection(new MyDbConfiguration("server=SuperFastDbServer;user=jsmith;password=…"));

Now, you’ve received a request to further streamline usage by allowing the configuration string to be passed directly to the main class, bypassing the need to reference the settings class:

var connection = new MyDbConnection("server=SuperFastDbServer;user=jsmith;password=…");

Since the goal is to construct instances of the main class by passing a string, it seems the way to implement this request is to give the main class a constructor that accepts a string as its argument.

Surprisingly, adding a constructor isn’t the only way to achieve the desired effect! In fact, it’s possible to satisfy this request without any modifications to the main class. Likely, you’ve already used the functionality that makes this possible—though perhaps without realizing you could use it with classes and structs you create.

However, there is a philosophical question about the appropriateness of applying this technique in this scenario. We’ll touch on this question later. Even if you decide against using the technique in this case, knowing about it hopefully will come in handy down the road when you encounter other, unquestionably appropriate situations where it can be used. Continue reading

Make It Easier for the DBA: Give SQL Connections the Application’s Name!

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Imagine you’re a database administrator tracing query activity on a server. You’d want all the clues you can get to help you figure out what’s going on. One clue is the name of the client program associated with each database session. This name, passed from client to Microsoft SQL Server when a connection is established, can be used by the DBA to differentiate between multiple applications running on a single client and to focus on (or filter out) activity from the same application across multiple clients.

Does your application pass a meaningful program name to the database server? Continue reading

.Net Core .csproj – Automatically Packaging README.txt

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Microsoft Visual Studio gives special treatment to a README.txt file found in a NuGet package’s root directory. If README.txt is present in this folder, Visual Studio displays its contents when the package is directly installed (vs. when it is installed as a dependency).

This sounds like a great way to display notes and examples to the developer getting ready to use your package—but how do you get a readme file copied from your project into the package during the packaging process? Continue reading

Introducing DataReaderAdapter: Adds AsDataReader()/AsDataReaderOfObjects() to IEnumerable<T>

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Yesterday, we released BenGribaudoLLC.IEnumerableHelpers.DataReaderAdapter as a NuGet package!

What does it to?

Adapts IEnumerable<T> to the IDataReader interface. Enables enumerable sequences to be used where a data reader is expected.

Great for loading data from a List<T>, LINQ expression or CSV parser into a database using SqlBulkCopy! Streams data to SqlBulkCopy, bypassing the need to first materialize the entire sequence in memory and load it into a DataTable. Continue reading

INotifyPropertyChanged – propertyName – Past, Present and Hopes for the Future

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Raising an INotifyPropertyChanged event requires a string containing the affected property’s name. Developers want a simple, clean and performance-efficient way to populate this string. New versions of .Net have brought developers closer and closer to achieving this goal.

Let’s review how INotifyPropertyChanged implementation options have improved over the years. Then, let’s consider an idea on how these options might be made even better. Continue reading

async/await Doesn’t Make Synchronous Code Asynchronous

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With the recent release of .Net 4.5/C# 5, I’ve spent time experimenting with the new async/await functionality. To my surprise, these new keywords didn’t have the effect I anticipated. Based on my skimming of pre-release information, I was under the impression that the appropriate use of these keywords would cause a normally-synchronous method to execute asynchronously.

Wrong! Continue reading