CancellationToken with async Dapper methods?

CancellationToken with async Dapper methods?

You can use a CancellationToken with async Dapper methods. When using async Dapper methods, you can pass in a CancellationToken as a parameter to the method.

Here's an example of how to use a CancellationToken with an async Dapper method:

using System.Threading; using Dapper; public async Task<List<Customer>> GetCustomersAsync(CancellationToken cancellationToken) { using (var connection = new SqlConnection(connectionString)) { await connection.OpenAsync(cancellationToken); var query = "SELECT * FROM Customers"; var customers = await connection.QueryAsync<Customer>(query, cancellationToken: cancellationToken); return customers.ToList(); } }

In this example, we define an async method GetCustomersAsync that takes a CancellationToken as a parameter. Inside the method, we create a new SqlConnection and open the connection asynchronously using the OpenAsync method, passing in the CancellationToken. We then use the QueryAsync method to execute a SQL query and return a list of Customer objects. We pass in the CancellationToken to the QueryAsync method to allow the query to be cancelled if the cancellation token is signalled.

Note that when using a CancellationToken with async Dapper methods, you'll need to ensure that the cancellation token is passed through to any lower-level asynchronous operations, such as opening a database connection or executing a query. In this example, we pass the CancellationToken to the OpenAsync and QueryAsync methods to allow them to be cancelled if the cancellation token is signalled.

Examples

  1. "CancellationToken with async Dapper query in C#"

    • Description: Learn how to use CancellationToken with an asynchronous Dapper query in C#.
    using Dapper; public async Task<IEnumerable<T>> GetItemsAsync(CancellationToken cancellationToken) { using (var connection = new SqlConnection(connectionString)) { await connection.OpenAsync(cancellationToken); return await connection.QueryAsync<T>("SELECT * FROM Items", cancellationToken: cancellationToken); } }

  2. "C# Dapper asynchronous methods and CancellationToken best practices"

    • Description: Explore best practices for using CancellationToken with asynchronous Dapper methods in C#.
    using Dapper; public async Task<IEnumerable<T>> GetItemsAsync(CancellationToken cancellationToken) { using (var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken)) using (var connection = new SqlConnection(connectionString)) { await connection.OpenAsync(cts.Token); return await connection.QueryAsync<T>("SELECT * FROM Items", cancellationToken: cts.Token); } }

  3. "C# Dapper asynchronous query with CancellationToken timeout"

    • Description: Implement a timeout with CancellationToken for an asynchronous Dapper query in C#.
    using Dapper; public async Task<IEnumerable<T>> GetItemsAsync(CancellationToken cancellationToken) { using (var connection = new SqlConnection(connectionString)) { await connection.OpenAsync(cancellationToken); return await connection.QueryAsync<T>("SELECT * FROM Items", cancellationToken: cancellationToken, commandTimeout: 30); } }

  4. "C# Dapper asynchronous methods and cooperative cancellation"

    • Description: Handle cooperative cancellation with CancellationToken in asynchronous Dapper methods in C#.
    using Dapper; public async Task<IEnumerable<T>> GetItemsAsync(CancellationToken cancellationToken) { using (var connection = new SqlConnection(connectionString)) { await connection.OpenAsync(cancellationToken); return await connection.QueryAsync<T>("SELECT * FROM Items", cancellationToken: cancellationToken); } }

  5. "C# Dapper asynchronous methods and cancellation token chaining"

    • Description: Chain cancellation tokens with Dapper asynchronous methods in C#.
    using Dapper; public async Task<IEnumerable<T>> GetItemsAsync(CancellationToken cancellationToken) { using (var connection = new SqlConnection(connectionString)) using (var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken)) { await connection.OpenAsync(cts.Token); return await connection.QueryAsync<T>("SELECT * FROM Items", cancellationToken: cts.Token); } }

  6. "C# Dapper asynchronous methods and CancellationToken handling in transactions"

    • Description: Handle CancellationToken in asynchronous Dapper methods within a transaction in C#.
    using Dapper; public async Task<IEnumerable<T>> GetItemsAsync(CancellationToken cancellationToken) { using (var connection = new SqlConnection(connectionString)) using (var transaction = connection.BeginTransaction()) { await connection.OpenAsync(cancellationToken); return await connection.QueryAsync<T>("SELECT * FROM Items", transaction: transaction, cancellationToken: cancellationToken); } }

  7. "C# Dapper asynchronous methods and CancellationToken for bulk operations"

    • Description: Use CancellationToken for bulk asynchronous Dapper operations in C#.
    using Dapper; public async Task BulkInsertAsync(IEnumerable<T> items, CancellationToken cancellationToken) { using (var connection = new SqlConnection(connectionString)) { await connection.OpenAsync(cancellationToken); await connection.ExecuteAsync("INSERT INTO Items (Name) VALUES (@Name)", items, cancellationToken: cancellationToken); } }

  8. "C# Dapper asynchronous methods and CancellationToken for stored procedures"

    • Description: Employ CancellationToken with asynchronous Dapper methods for stored procedures in C#.
    using Dapper; public async Task<IEnumerable<T>> CallStoredProcedureAsync(CancellationToken cancellationToken) { using (var connection = new SqlConnection(connectionString)) { await connection.OpenAsync(cancellationToken); return await connection.QueryAsync<T>("StoredProcedureName", commandType: CommandType.StoredProcedure, cancellationToken: cancellationToken); } }

  9. "C# Dapper asynchronous methods and CancellationToken exception handling"

    • Description: Handle exceptions with CancellationToken in asynchronous Dapper methods in C#.
    using Dapper; public async Task<IEnumerable<T>> GetItemsAsync(CancellationToken cancellationToken) { try { using (var connection = new SqlConnection(connectionString)) { await connection.OpenAsync(cancellationToken); return await connection.QueryAsync<T>("SELECT * FROM Items", cancellationToken: cancellationToken); } } catch (OperationCanceledException) { // Handle cancellation return Enumerable.Empty<T>(); } }

  10. "C# Dapper asynchronous methods and CancellationTokenSource for advanced cancellation"

    • Description: Leverage CancellationTokenSource for advanced cancellation scenarios with asynchronous Dapper methods in C#.
    using Dapper; public async Task<IEnumerable<T>> GetItemsAsync(CancellationToken cancellationToken) { using (var cts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken)) using (var connection = new SqlConnection(connectionString)) { await connection.OpenAsync(cts.Token); return await connection.QueryAsync<T>("SELECT * FROM Items", cancellationToken: cts.Token); } }

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