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C# Programming Language
When you insert a record into a table with an identity column, the value for the identity column is automatically generated for you. The simplest way to get the inserted identity value is to put OUTPUT INSERTED.<identity column name> in the insert statement: To get the output value with Dapper, use ExecuteScalar<int>(): This inserts the … Read more
Problem You have a project that is using text templating and you’re upgrading to a new version of Visual Studio. When you open the project, you get error messages about not being able to import the Microsoft.TextTemplating.targets project: Project “…\v16.0\TextTemplating\Microsoft.TextTemplating.targets” was not imported by “…SomeProject.csproj” at (7,3), due to the file not existing. The error … Read more
The simplest way to add dynamic parameters with Dapper is by passing in Dictionary<string, object>: You can also add dynamic parameter by using the DynamicParameters class. You can use whichever approach is simplest in the given scenario. In this article, I’ll show examples of adding dynamic parameters in different scenarios. Add dynamic parameters one at … Read more
When you’re querying joined tables, you can map each row to multiple objects by using the multi mapping feature in Dapper. To multi map, you have to provide Dapper with the following: Which types to map to. Which column(s) to split on. This tells Dapper which columns it should try to map to which type. … Read more
Using TransactionScope is the simplest way to execute multiple SQL commands in a transaction. Here’s an example of how to use it: When you call TransactionScope.Complete(), it commits the transaction. If you don’t call Complete(), it’ll rollback the transaction once it leaves the TransactionScope block. This keeps the code nice and clean and works well … Read more
Here’s an example of using Dapper to execute a basic SELECT query: Dapper abstracts away the repetitive code involved in executing SQL queries, including mapping parameters and query results. It does this without any configuration (it maps by using reflection). In this article, I’ll show more examples of using Dapper in common scenarios, such as … Read more
Visual Studio 2022 has a feature called IntelliCode completions that suggests full line completions as you’re typing. It’s enabled by default. It shows a greyed out suggestion based on what it thinks you’re going to want. This is different from the regular IntelliSense modal popup that shows below the line you’re typing. Here’s what it … Read more
It’s important to add .gitignore to your git repository. This tells git which files in your source directory to not track. Without this, you end up pushing lots of unnecessary files to your repository – such as build output files. The simplest way to add .gitignore is by using Visual Studio. This initializes it with … Read more
When you use a single instance of HttpClient to send requests, it keeps connections open in order to speed up future requests. By default, idle connections are closed after 2 minutes, and otherwise will be kept open forever (in theory). In reality, the connection can be closed by the server-side (or other external factors) regardless … Read more
When you use the same instance of HttpClient for multiple requests (sequential and concurrent) to the same URL, it’ll reuse connections. Requests that get to reuse a connection are 5.5-8.5x faster than requests that have to open a new connection. There are a few scenarios that benefit from this connection reuse: Sending sequential requests frequently. … Read more
