使用NOLOCK的实体框架

ado.net entity-framework

如何在Entity Framework上使用NOLOCK功能? XML是唯一的方法吗?

一般承认的答案

不,但您可以启动事务并将隔离级别设置为uncommited 。这基本上与NOLOCK相同,但它不是基于每个表执行,而是针对事务范围内的所有内容执行此操作。

如果这听起来像你想要的那样,这就是你如何去做...

//declare the transaction options
var transactionOptions = new System.Transactions.TransactionOptions();
//set it to read uncommited
transactionOptions.IsolationLevel = System.Transactions.IsolationLevel.ReadUncommitted;
//create the transaction scope, passing our options in
using (var transactionScope = new System.Transactions.TransactionScope(
    System.Transactions.TransactionScopeOption.Required, 
    transactionOptions)
)

//declare our context
using (var context = new MyEntityConnection())
{
    //any reads we do here will also read uncomitted data
    //...
    //...
    //don't forget to complete the transaction scope
    transactionScope.Complete();
}

热门答案

扩展方法可以使这更容易

public static List<T> ToListReadUncommitted<T>(this IQueryable<T> query)
{
    using (var scope = new TransactionScope(
        TransactionScopeOption.Required, 
        new TransactionOptions() { 
            IsolationLevel = System.Transactions.IsolationLevel.ReadUncommitted }))
    {
        List<T> toReturn = query.ToList();
        scope.Complete();
        return toReturn;
    }
}

public static int CountReadUncommitted<T>(this IQueryable<T> query)
{
    using (var scope = new TransactionScope(
        TransactionScopeOption.Required, 
        new TransactionOptions() { 
            IsolationLevel = System.Transactions.IsolationLevel.ReadUncommitted }))
    {
        int toReturn = query.Count();
        scope.Complete();
        return toReturn;
    }
}



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许可下: CC-BY-SA with attribution
不隶属于 Stack Overflow
这个KB合法吗? 是的,了解原因