public DbContext CreateDbContex <TDbContext>(string connectionString, IIocResolve iocResolve) where TDbContext : DbContext
{
DbContext dbContext;
ActiveTransactionInfo activeTransaction;
activeTransaction = ActiveTransations.TryGetValue(connectionString, out activeTransaction)
? activeTransaction
: default(ActiveTransactionInfo);
if (activeTransaction == null)//没找到则ioc通过NamedParameter创建一个
{
dbContext = iocResolve.ResolveParameter <TDbContext>(new NamedParameter("nameOrConnectionString",
connectionString));
var dbTransaction = dbContext.Database.BeginTransaction(System.Data.IsolationLevel.ReadUncommitted);
activeTransaction = new ActiveTransactionInfo(dbTransaction, dbContext);
ActiveTransations[connectionString] = activeTransaction;
}
else//找到了则通过ioc把DbConnection作为参数创建一个DbContext
{
dbContext = iocResolve.ResolveParameter <TDbContext>(new Parameter[] {
new NamedParameter("existingConnection", activeTransaction.DbContextTransaction.UnderlyingTransaction.Connection),
new NamedParameter("contextOwnsConnection", false)
}); //通过connection参数resolve一个dbcontext对象
//dbContext = iocResolve.ResolveParameter<TDbContext>(new TypedParameter(typeof(DbConnection),
//activeTransaction.DbContextTransaction.UnderlyingTransaction.Connection));
dbContext.Database.UseTransaction(activeTransaction.DbContextTransaction.UnderlyingTransaction);
activeTransaction.AttendedDbContexts.Add(dbContext);
}
DbContexts.Add(dbContext);
return(dbContext);
}
/// <summary>
/// Dispose
/// </summary>
/// <param name="iocResolve"></param>
public virtual void Dispose(IIocResolve iocResolve)
{
foreach (var activeTransaction in ActiveTransations.Values)
{
foreach (var attendedDbContext in activeTransaction.AttendedDbContexts)
{
iocResolve.Release(attendedDbContext);
}
activeTransaction.DbContextTransaction.Dispose();
iocResolve.Release(activeTransaction.StartDbContext);
}
//清除事务
ActiveTransations.Clear();
foreach (var dbContext in DbContexts)
{
iocResolve.Release(dbContext);
}
//清除DbContexts
DbContexts.Clear();
if (CurrentTransaction == null)
{
return;
}
CurrentTransaction.Dispose();
CurrentTransaction = null;
}
