LINQPad [extension] methods in C#

LINQPad [extension] methods in C#

LINQPad is a popular tool for interactively querying databases and running C# code snippets. It provides a rich set of extension methods that can be used to manipulate data in LINQ queries. Here are some commonly used extension methods in LINQPad:

1. Dump(): This is the most commonly used extension method in LINQPad. It outputs the result of a LINQ query to the console or the results pane. It is used to inspect and debug LINQ queries.

 var customers = from c in db.Customers select c; customers.Dump();

2. Take(): This method returns a specified number of elements from the beginning of a sequence.

 var customers = from c in db.Customers select c; var top5 = customers.Take(5); top5.Dump();

3. Skip(): This method skips a specified number of elements from the beginning of a sequence and returns the remaining elements.

 var customers = from c in db.Customers select c; var skip5 = customers.Skip(5); skip5.Dump();

4. Where(): This method filters a sequence based on a specified condition.

 var customers = from c in db.Customers select c; var filtered = customers.Where(c => c.City == "London"); filtered.Dump();

5. Select(): This method projects each element of a sequence into a new form.

 var customers = from c in db.Customers select c; var projected = customers.Select(c => new { c.CustomerID, c.ContactName }); projected.Dump();

6. OrderBy(): This method sorts the elements of a sequence in ascending order based on a specified key.

 var customers = from c in db.Customers select c; var sorted = customers.OrderBy(c => c.ContactName); sorted.Dump();

These are just a few examples of the many extension methods available in LINQPad. You can find more information about these methods and others in the LINQPad documentation.

Examples

  1. "LINQPad Extensions - Basic Usage"

    Description: Implement a basic LINQPad extension method to demonstrate its usage.

    // Code: public static class MyExtensions { public static string ToUpperCase(this string input) { return input.ToUpper(); } }

  2. "LINQPad Extensions - Use in LINQ Query"

    Description: Apply the LINQPad extension method in a LINQ query.

    // Code: var result = myCollection.Select(item => item.Property.ToUpperCase()).ToList();

  3. "LINQPad Extensions - Method Chaining"

    Description: Chain LINQPad extension methods for a sequence of operations.

    // Code: public static class MyExtensions { public static string ToUpperCase(this string input) { return input.ToUpper(); } public static string AddPrefix(this string input, string prefix) { return prefix + input; } } // Usage: var result = myCollection.Select(item => item.Property.ToUpperCase().AddPrefix("PREFIX")).ToList();

  4. "LINQPad Extensions - Parameterized Extension Method"

    Description: Create a LINQPad extension method with parameters.

    // Code: public static class MyExtensions { public static string AddSuffix(this string input, string suffix) { return input + suffix; } } // Usage: var result = myCollection.Select(item => item.Property.AddSuffix("_SUFFIX")).ToList();

  5. "LINQPad Extensions - Extension Method for Complex Type"

    Description: Define an extension method for a complex type.

    // Code: public static class MyExtensions { public static int CalculateTotal(this List<int> numbers) { return numbers.Sum(); } } // Usage: var total = myListOfInts.CalculateTotal();

  6. "LINQPad Extensions - Using LINQ Query Syntax"

    Description: Apply LINQPad extension methods using query syntax.

    // Code: var result = from item in myCollection select item.Property.ToUpperCase();

  7. "LINQPad Extensions - Extension Method with LINQ Query in Expression Trees"

    Description: Incorporate LINQPad extension methods into expression trees.

    // Code: var result = myQueryableCollection.Where(item => item.Property.ToUpperCase() == "TARGET").ToList();

  8. "LINQPad Extensions - Nullable Type Extension Method"

    Description: Create an extension method for a nullable type.

    // Code: public static class MyExtensions { public static bool IsNegative(this int? number) { return number.HasValue && number < 0; } } // Usage: var isNegative = myNullableInt.IsNegative();

  9. "LINQPad Extensions - Extension Method for LINQPad's Dump"

    Description: Develop an extension method that works seamlessly with LINQPad's Dump method.

    // Code: public static class MyExtensions { public static void DumpAndPrint(this IEnumerable<object> collection) { collection.Dump(); Console.WriteLine("Printing additional information..."); } } // Usage: myCollection.DumpAndPrint();

  10. "LINQPad Extensions - Implementing IQueryable Extension"

    Description: Create an extension method for IQueryable to extend LINQ operations.

    // Code: public static class QueryableExtensions { public static IQueryable<T> WhereActive<T>(this IQueryable<T> query) where T : IActivatable { return query.Where(item => item.IsActive); } } // Usage: var activeItems = dbContext.Items.WhereActive().ToList();

More Tags

stdout mysql-error-1222 listeners tmux http-proxy names .net-core outlook-2010 artisan-migrate cobertura

More C# Questions

More Statistics Calculators

More Physical chemistry Calculators

More Stoichiometry Calculators

More Entertainment Anecdotes Calculators