private OsharpDbContextConfig GetDbContextResolveOptionsConfig(Type dbContextType)
{
IOsharpConfigProvider osharpConfigProvider = _serviceProvider.GetService <IOsharpConfigProvider>();
OsharpConfig osharpConfig = osharpConfigProvider.Create();
OsharpDbContextConfig dbContextConfig = osharpConfig.DbContexts.Values.SingleOrDefault(m => m.DbContextType == dbContextType);
if (dbContextConfig == null)
{
throw new OsharpException($"无法找到数据上下文“{dbContextType}”的配置信息");
}
return(dbContextConfig);
}
/// <summary>
/// 获取指定数据上下文类型<typeparamref name="TEntity"/>的实例
/// </summary>
/// <typeparam name="TEntity">实体类型</typeparam>
/// <typeparam name="TKey">实体主键类型</typeparam>
/// <returns><typeparamref name="TEntity"/>所属上下文类的实例</returns>
public IDbContext GetDbContext <TEntity, TKey>() where TEntity : IEntity <TKey> where TKey : IEquatable <TKey>
{
IEntityConfigurationTypeFinder typeFinder = _serviceProvider.GetService <IEntityConfigurationTypeFinder>();
Type dbContextType = typeFinder.GetDbContextTypeForEntity(typeof(TEntity));
DbContext dbContext;
OsharpDbContextConfig dbContextConfig = GetDbContextResolveOptionsConfig(dbContextType);
DbContextResolveOptions resolveOptions = new DbContextResolveOptions(dbContextConfig);
IDbContextResolver contextResolver = _serviceProvider.GetService <IDbContextResolver>();
ActiveTransactionInfo transInfo = ActiveTransactionInfos.GetOrDefault(resolveOptions.ConnectionString);
//连接字符串的事务不存在，添加起始上下文事务信息
if (transInfo == null)
{
resolveOptions.ExistingConnection = null;
dbContext = contextResolver.Resolve(resolveOptions);
IDbContextTransaction transaction = dbContext.Database.BeginTransaction();
transInfo = new ActiveTransactionInfo(transaction, dbContext);
ActiveTransactionInfos[resolveOptions.ConnectionString] = transInfo;
}
else
{
resolveOptions.ExistingConnection = transInfo.DbContextTransaction.GetDbTransaction().Connection;
dbContext = contextResolver.Resolve(resolveOptions);
if (dbContext.IsRelationalTransaction())
{
dbContext.Database.UseTransaction(transInfo.DbContextTransaction.GetDbTransaction());
}
else
{
dbContext.Database.BeginTransaction();
}
transInfo.AttendedDbContexts.Add(dbContext);
}
return(dbContext as IDbContext);
}
/// <summary>
/// 初始化一个<see cref="DbContextResolveOptions"/>类型的新实例
/// </summary>
public DbContextResolveOptions(OsharpDbContextConfig config)
{
DbContextType = config.DbContextType;
ConnectionString = config.ConnectionString;
DatabaseType = config.DatabaseType;
}
