假設要Insert1個用戶和該用戶對應角色，而這2個Insert方法已經封裝到2個dll中了，現在要在這個2個方法中實現事務，代碼很簡單，如下(需先添加對System.Transactions程序集的引用)

?1public?void?Insert(string?UserName,ArrayList?alRoles)
?2{
?3using?(TransactionScope?_ts?=?new?TransactionScope())
?4{
?5?????//插入用戶
?6??????new?user().Insert(UserName);
?7
?8?????//??插入角色
?9???????new?Role().Insert(UserName,alRoles);
10
11??????_ts.Complete();
12}
13}

異步提交事務的代碼也很簡單：

?1????????public?void?Work()
?2????????{
?3????????????Transaction?_old?=?Transaction.Current;
?4????????????CommittableTransaction?_newCommit?=?new?CommittableTransaction();
?5????????????Transaction.Current?=?_newCommit;
?6
?7????????????try
?8????????????{
?9????????????????_newCommit.BeginCommit(OnCommit,?null);
10????????????}
11????????????finally
12????????????{
13????????????????Transaction.Current?=?_old;
14????????????}
15????????}
16????????void?OnCommit(IAsyncResult?asy)
17????????{
18????????????CommittableTransaction?_commit;
19????????????_commit?=?asy?as?CommittableTransaction;
20
21????????????try
22????????????{
23????????????????using?(_commit)
24????????????????{
25????????????????????SqlConnection?_cnn?=?new?SqlConnection("");
26????????????????????SqlCommand?_cmd?=?new?SqlCommand();
27
28
29????????????????????_cnn.Open();
30
31????????????????????_cnn.EnlistTransaction(_commit);????//??利用事務
32
33????????????????????_cmd.Connection?=?_cnn;
34
35????????????????????_cmd.CommandText?=?".";
36????????????????????_cmd.ExecuteNonQuery();
37
38????????????????????_cmd.CommandText?=?"";
39????????????????????_cmd.ExecuteNonQuery();
40
41????????????????????_commit.EndCommit(asy);
42
43????????????????????_cnn.Close();
44????????????????}
45????????????}
46????????????catch?(Exception?e)
47????????????{
48
49????????????}
50????????}
上面我們用TransactionScope和CommittableTransaction。
TransactionScope是隱示的，是由系統自動管理的，所以它沒有什么RollBack方法。
CommittableTransaction是顯示的，它有commit和RollBack方法。
------------------------------------------
以上都是個人的看法和體會，如有不妥處，還請大家多多指點，謝謝！

轉載于:https://www.cnblogs.com/BearsTaR/archive/2006/04/17/Transactions.html

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