本文整理汇总了C#中DbContext.Attach方法的典型用法代码示例。如果您正苦于以下问题：C# DbContext.Attach方法的具体用法？C# DbContext.Attach怎么用？C# DbContext.Attach使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类DbContext的用法示例。
在下文中一共展示了DbContext.Attach方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: It_throws_object_disposed_exception
public async void It_throws_object_disposed_exception()
{
var context = new DbContext(new DbContextOptions<DbContext>());
context.Dispose();
// methods (tests all paths)
Assert.Throws<ObjectDisposedException>(() => context.Add(new object()));
Assert.Throws<ObjectDisposedException>(() => context.Attach(new object()));
Assert.Throws<ObjectDisposedException>(() => context.Update(new object()));
Assert.Throws<ObjectDisposedException>(() => context.Remove(new object()));
Assert.Throws<ObjectDisposedException>(() => context.SaveChanges());
await Assert.ThrowsAsync<ObjectDisposedException>(() => context.SaveChangesAsync());
var methodCount = typeof(DbContext).GetMethods(BindingFlags.Public | BindingFlags.Instance | BindingFlags.DeclaredOnly).Count();
var expectedMethodCount = 27;
Assert.True(
methodCount == expectedMethodCount,
userMessage: $"Expected {expectedMethodCount} methods on DbContext but found {methodCount}. " +
"Update test to ensure all methods throw ObjectDisposedException after dispose.");
// getters
Assert.Throws<ObjectDisposedException>(() => context.ChangeTracker);
Assert.Throws<ObjectDisposedException>(() => context.Model);
var expectedProperties = new List<string> { "ChangeTracker", "Database", "Model" };
Assert.True(expectedProperties.SequenceEqual(
typeof(DbContext)
.GetProperties()
.Select(p => p.Name)
.OrderBy(s => s)
.ToList()),
userMessage: "Unexpected properties on DbContext. " +
"Update test to ensure all getters throw ObjectDisposedException after dispose.");
Assert.Throws<ObjectDisposedException>(() => ((IInfrastructure<IServiceProvider>)context).Instance);
}