本文整理汇总了C#中DbContextCustomerRepository.FirstOrDefault方法的典型用法代码示例。如果您正苦于以下问题：C# DbContextCustomerRepository.FirstOrDefault方法的具体用法？C# DbContextCustomerRepository.FirstOrDefault怎么用？C# DbContextCustomerRepository.FirstOrDefault使用的例子？那么, 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DbContextCustomerRepository的用法示例。
在下文中一共展示了DbContextCustomerRepository.FirstOrDefault方法的3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: CreateCustomerIfNotAlreadyExists
public static void CreateCustomerIfNotAlreadyExists(int id)
{
using (var dbContext = new TestDbContextContainer())
{
using (var repository = new DbContextCustomerRepository(dbContext))
{
var existingCustomer = repository.FirstOrDefault(x => x.Id == id);
if (existingCustomer == null)
{
var customer = CreateCustomer(id);
repository.Add(customer);
dbContext.SaveChanges();
}
}
}
}示例2: ReturnsEntityWhenTableContainsEntity
public void ReturnsEntityWhenTableContainsEntity()
{
using (var dbContext = new TestDbContextContainer())
{
using (var repository = new DbContextCustomerRepository(dbContext))
{
EFTestHelper.CreateCustomerIfNotAlreadyExists(1);
var customer = repository.FirstOrDefault();
Assert.IsNotNull(customer);
Assert.AreEqual(1, customer.Id);
}
}
}示例3: ReturnsNullWhenTableContainsEntity
public void ReturnsNullWhenTableContainsEntity()
{
using (var dbContext = new TestDbContextContainer())
{
using (var repository = new DbContextCustomerRepository(dbContext))
{
var customer = repository.FirstOrDefault(x => x.Id == 999);
Assert.IsNull(customer);
}
}
}