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Some using declarations (#3795)
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@roji
roji authored Apr 5, 2022
1 parent 7eebded commit 6cb13eb
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Showing 7 changed files with 206 additions and 228 deletions.
16 changes: 7 additions & 9 deletions samples/core/DbContextPooling/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -77,16 +77,14 @@ await Task.WhenAll(

private static void SetupDatabase(IServiceProvider serviceProvider)
{
using (var serviceScope = serviceProvider.CreateScope())
{
var context = serviceScope.ServiceProvider.GetService<BloggingContext>();
using var serviceScope = serviceProvider.CreateScope();
var context = serviceScope.ServiceProvider.GetService<BloggingContext>();

if (context.Database.EnsureCreated())
{
context.Blogs.Add(new Blog { Name = "The Dog Blog", Url = "http://sample.com/dogs" });
context.Blogs.Add(new Blog { Name = "The Cat Blog", Url = "http://sample.com/cats" });
context.SaveChanges();
}
if (context.Database.EnsureCreated())
{
context.Blogs.Add(new Blog { Name = "The Dog Blog", Url = "http://sample.com/dogs" });
context.Blogs.Add(new Blog { Name = "The Cat Blog", Url = "http://sample.com/cats" });
context.SaveChanges();
}
}

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51 changes: 25 additions & 26 deletions samples/core/GetStarted/Program.cs
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Expand Up @@ -7,33 +7,32 @@ internal class Program
{
private static void Main()
{
using (var db = new BloggingContext())
{
// Note: This sample requires the database to be created before running.
Console.WriteLine($"Database path: {db.DbPath}.");

// Create
Console.WriteLine("Inserting a new blog");
db.Add(new Blog { Url = "http://blogs.msdn.com/adonet" });
db.SaveChanges();
using var db = new BloggingContext();

// Read
Console.WriteLine("Querying for a blog");
var blog = db.Blogs
.OrderBy(b => b.BlogId)
.First();
// Note: This sample requires the database to be created before running.
Console.WriteLine($"Database path: {db.DbPath}.");

// Update
Console.WriteLine("Updating the blog and adding a post");
blog.Url = "https://devblogs.microsoft.com/dotnet";
blog.Posts.Add(
new Post { Title = "Hello World", Content = "I wrote an app using EF Core!" });
db.SaveChanges();
// Create
Console.WriteLine("Inserting a new blog");
db.Add(new Blog { Url = "http://blogs.msdn.com/adonet" });
db.SaveChanges();

// Delete
Console.WriteLine("Delete the blog");
db.Remove(blog);
db.SaveChanges();
}
// Read
Console.WriteLine("Querying for a blog");
var blog = db.Blogs
.OrderBy(b => b.BlogId)
.First();

// Update
Console.WriteLine("Updating the blog and adding a post");
blog.Url = "https://devblogs.microsoft.com/dotnet";
blog.Posts.Add(
new Post { Title = "Hello World", Content = "I wrote an app using EF Core!" });
db.SaveChanges();

// Delete
Console.WriteLine("Delete the blog");
db.Remove(blog);
db.SaveChanges();
}
}
}
136 changes: 65 additions & 71 deletions samples/core/Miscellaneous/ConnectionResiliency/Program.cs
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Expand Up @@ -27,101 +27,95 @@ public static void Main(string[] args)
private static void ExecuteWithManualTransaction()
{
#region ManualTransaction
using (var db = new BloggingContext())
{
var strategy = db.Database.CreateExecutionStrategy();

strategy.Execute(
() =>
{
using (var context = new BloggingContext())
{
using (var transaction = context.Database.BeginTransaction())
{
context.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/dotnet" });
context.SaveChanges();
context.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/visualstudio" });
context.SaveChanges();
transaction.Commit();
}
}
});
}

using var db = new BloggingContext();
var strategy = db.Database.CreateExecutionStrategy();

strategy.Execute(
() =>
{
using var context = new BloggingContext();
using var transaction = context.Database.BeginTransaction();
context.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/dotnet" });
context.SaveChanges();
context.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/visualstudio" });
context.SaveChanges();
transaction.Commit();
});

#endregion
}

private static void ExecuteWithManualAmbientTransaction()
{
#region AmbientTransaction
using (var context1 = new BloggingContext())
{
context1.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/visualstudio" });

var strategy = context1.Database.CreateExecutionStrategy();

strategy.Execute(
() =>
{
using (var context2 = new BloggingContext())
{
using (var transaction = new TransactionScope())
{
context2.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/dotnet" });
context2.SaveChanges();
context1.SaveChanges();
transaction.Complete();
}
}
});
}

using var context1 = new BloggingContext();
context1.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/visualstudio" });

var strategy = context1.Database.CreateExecutionStrategy();

strategy.Execute(
() =>
{
using var context2 = new BloggingContext();
using var transaction = new TransactionScope();
context2.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/dotnet" });
context2.SaveChanges();
context1.SaveChanges();
transaction.Complete();
});

#endregion
}

private static void ExecuteInTransactionWithVerification()
{
#region Verification
using (var db = new BloggingContext())
{
var strategy = db.Database.CreateExecutionStrategy();

var blogToAdd = new Blog { Url = "http://blogs.msdn.com/dotnet" };
db.Blogs.Add(blogToAdd);
using var db = new BloggingContext();
var strategy = db.Database.CreateExecutionStrategy();

strategy.ExecuteInTransaction(
db,
operation: context => { context.SaveChanges(acceptAllChangesOnSuccess: false); },
verifySucceeded: context => context.Blogs.AsNoTracking().Any(b => b.BlogId == blogToAdd.BlogId));
var blogToAdd = new Blog { Url = "http://blogs.msdn.com/dotnet" };
db.Blogs.Add(blogToAdd);

strategy.ExecuteInTransaction(
db,
operation: context => { context.SaveChanges(acceptAllChangesOnSuccess: false); },
verifySucceeded: context => context.Blogs.AsNoTracking().Any(b => b.BlogId == blogToAdd.BlogId));

db.ChangeTracker.AcceptAllChanges();

db.ChangeTracker.AcceptAllChanges();
}
#endregion
}

private static void ExecuteInTransactionWithTracking()
{
#region Tracking
using (var db = new BloggingContext())
{
var strategy = db.Database.CreateExecutionStrategy();

db.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/dotnet" });
using var db = new BloggingContext();
var strategy = db.Database.CreateExecutionStrategy();

var transaction = new TransactionRow { Id = Guid.NewGuid() };
db.Transactions.Add(transaction);
db.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/dotnet" });

strategy.ExecuteInTransaction(
db,
operation: context => { context.SaveChanges(acceptAllChangesOnSuccess: false); },
verifySucceeded: context => context.Transactions.AsNoTracking().Any(t => t.Id == transaction.Id));
var transaction = new TransactionRow { Id = Guid.NewGuid() };
db.Transactions.Add(transaction);

strategy.ExecuteInTransaction(
db,
operation: context => { context.SaveChanges(acceptAllChangesOnSuccess: false); },
verifySucceeded: context => context.Transactions.AsNoTracking().Any(t => t.Id == transaction.Id));

db.ChangeTracker.AcceptAllChanges();
db.Transactions.Remove(transaction);
db.SaveChanges();

db.ChangeTracker.AcceptAllChanges();
db.Transactions.Remove(transaction);
db.SaveChanges();
}
#endregion
}
}
Expand Down Expand Up @@ -156,4 +150,4 @@ public class Blog
public class TransactionRow
{
public Guid Id { get; set; }
}
}
26 changes: 12 additions & 14 deletions samples/core/Miscellaneous/NewInEFCore6/SqliteSamples.cs
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Expand Up @@ -46,25 +46,23 @@ public static void DateOnly_and_TimeOnly()
Helpers.RecreateCleanDatabase();
Helpers.PopulateDatabase();

using var context = new UsersContext();

using (var context = new UsersContext())
{
#region DateOnlyQuery
var users = context.Users.Where(u => u.Birthday < new DateOnly(1900, 1, 1)).ToList();
#endregion
#region DateOnlyQuery
var users = context.Users.Where(u => u.Birthday < new DateOnly(1900, 1, 1)).ToList();
#endregion

Console.WriteLine();
Console.WriteLine();

foreach (var user in users)
{
Console.WriteLine($" Found '{user.Username}'");
user.Birthday = new(user.Birthday.Year + 100, user.Birthday.Month, user.Birthday.Day);
}
foreach (var user in users)
{
Console.WriteLine($" Found '{user.Username}'");
user.Birthday = new(user.Birthday.Year + 100, user.Birthday.Month, user.Birthday.Day);
}

Console.WriteLine();
Console.WriteLine();

context.SaveChanges();
}
context.SaveChanges();
}

private static void PerformUpdates()
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