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.Net全局Filter事务

流沙雨帘 2022-04-06 阅读 21
.netcore

1.创建一个TransactionScopeFilter继承IAsyncActionFilter接口

using Microsoft.AspNetCore.Mvc.Controllers;
using Microsoft.AspNetCore.Mvc.Filters;
using System.Transactions;

namespace WebApi.Controllers
{
    public class TransactionScopeFilter : IAsyncActionFilter
    {
        public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
        {
            //context.ActionDescriptor 是当前执行的Action方法的参数信息
            ControllerActionDescriptor ctrlActionDesc = context.ActionDescriptor as ControllerActionDescriptor;
            bool isTX = false;//是否执行事务
            if (ctrlActionDesc != null)//不是一个MVC的Action
            {
                //ctrlActionDesc.MethodInfo当前执行的Action
                //GetCustomAttributes(typeof(NotTransactionalAttribute), false).Any(); 获取当前的Action是否含有该特性。这里看步骤二创建一个NotTransactionalAttribute
                bool hasNotTransactionalAttribute = ctrlActionDesc.MethodInfo.GetCustomAttributes(typeof(NotTransactionalAttribute), false).Any();
                isTX = !hasNotTransactionalAttribute;
                if (isTX)
                {
                    //TransactionScopeAsyncFlowOption.Enabled 执行异步
                    using (TransactionScope tx = new TransactionScope(TransactionScopeAsyncFlowOption.Enabled))
                    {
                        var r = await next();//指的是进入Action动作
                        if (r.Exception == null)//是否异常
                        {
                        	//没有异常执行事务
                            tx.Complete();
                        }
                    }
                }
                else
                {
                    await next();//进入下一个中间键
                }
            }
        }
    }
}

2.创建一个特性NotTransactionalAttribute继承Attribute,这里的作用就是再某个方法上加入这个特性,不会添加事务

public class NotTransactionalAttribute: Attribute
    {
    }

3.注入这个Filter

builder.Services.Configure<MvcOptions>(opt =>
{
    opt.Filters.Add<TransactionScopeFilter>();
});

4.创建一个控制器

[HttpPost]
[NotTransactional]//标注了这特性需要自己手动来实例化TransactionScope 
public string Test4()
{
    using (TransactionScope tx = new TransactionScope())
    {
        ctx.Books.Add(new Book { Author = "asd", Title = "asd" 	  });
        ctx.SaveChanges();
        tx.Complete();
        return "ok";
     }
}

//这个方法已经含有事务
[HttpPost]
public async Task<string> Test2()
{
     ctx.Books.Add(new Book { Author = "asd", Title = "asd" });
     await ctx.SaveChangesAsync();
     return "ok";
}

这就完成了一个全局Filter事务

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