C# learning path

Bài tập C#

Luyện C# và .NET với 25 bài tập có thể chạy trực tiếp.

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25 lessons

Validate Input with TryParse

Parse user input without using exceptions for ordinary validation.

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Switch Expression Calculator

Build a calculator with a C# switch expression.

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Invoice and Numeric Formatting

Format aligned currency output with interpolation.

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DateOnly Appointment Scheduler

Calculate dates with DateOnly and DayOfWeek.

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Nullable User Profile

Safely display optional profile data.

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Return Statistics with Tuples

Return several named results without creating a class.

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Generic Task List

Manage typed task records with List<T>.

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Word Frequency Dictionary

Count normalized words with Dictionary<TKey,TValue>.

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Unique Tags with HashSet

Normalize and deduplicate tags.

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Group Students with LINQ

Group records and calculate category averages.

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Filter and Project Products

Create a LINQ pipeline over product records.

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Join Customers and Orders

Combine related sequences with LINQ Join.

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Paginate with Skip and Take

Select one page from an ordered sequence.

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Encapsulated Bank Account

Protect a balance with validated domain methods.

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Polymorphic Payroll

Calculate pay for different employee types.

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Interface-Based Notifications

Send messages through interchangeable implementations.

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Immutable Order Record

Update immutable data with a with expression.

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Generic In-Memory Repository

Store any entity type through a reusable generic class.

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Pattern Matching Classifier

Classify mixed values with property and relational patterns.

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Custom Enumerable Extension

Create a reusable extension method for sequences.

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Publisher and Subscriber Events

Notify subscribers when an order changes.

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Concurrent Tasks with WhenAll

Run independent asynchronous operations concurrently.

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JSON Round Trip

Serialize and deserialize a typed record.

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Custom Domain Exception

Create and catch an exception that expresses a business failure.

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Debug a LINQ Filter

Inspect predicate inputs and verify a corrected LINQ condition.

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