参考 : http://msdn.microsoft.com/en-us/data/dn469464.aspx
EF 允许我们在发送SQL请求和返回数据时做一些拦截的动作
比如可以自定义写 log ,修改command , 修改result 等等
这里只是给一个简单的例子,以后有用到才研究吧.
public class EFInterceptorForSetTimeZone : IDbCommandInterceptor { public void NonQueryExecuting(DbCommand command, DbCommandInterceptionContext<int> interceptionContext) { } public void NonQueryExecuted( DbCommand command, DbCommandInterceptionContext<int> interceptionContext) { } public void ReaderExecuting( DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext) { command.CommandText = "set time_zone = '-8:00';" + command.CommandText; } public void ReaderExecuted(DbCommand command, DbCommandInterceptionContext<DbDataReader> interceptionContext) { //use table to load result then modify then convert back to reader var dataTable = new DataTable(); dataTable.Load(interceptionContext.Result); dataTable.Rows[0]["id"] = 55555; interceptionContext.Result = dataTable.CreateDataReader(); } public void ScalarExecuting( DbCommand command, DbCommandInterceptionContext<object> interceptionContext) { } public void ScalarExecuted(DbCommand command, DbCommandInterceptionContext<object> interceptionContext) { } private void LogIfNonAsync<TResult>(DbCommand command, DbCommandInterceptionContext<TResult> interceptionContext) { } private void LogIfError<TResult>(DbCommand command, DbCommandInterceptionContext<TResult> interceptionContext) { } } protected void Page_Load(object sender, EventArgs e) { try { using (DB db = new DB()) { DbInterception.Add(new EFInterceptorForSetTimeZone()); //添加一个拦截器 //拦截for写log, 放一个委托函数就可以了, //msg 就是entity pass 进来的 string //function (msg) { do something with no return.. }; db.Database.Log = msg => { string y = msg; }; var xyz = db.admins.ToList(); } } catch (Exception ex) { string x = ex.Message; } }