.netcoreAOP之ExceptionFilter全局的异常处理

编程

ExceptionFilter(用于全局的异常处理)

通常程序异常处理,我们使用 try catch,如下:

       public IActionResult Index()

{

try

{

var range = Enumerable.Range(1, 3).ToArray();

var result = range[4]; // 索引越界错误

return View();

}

catch (Exception)

{

// 错误处理

throw;

}

}

有没有一种我的程序任何地方错误都统一处理了,采集到Log或者统一转到500页面呢?

有的

新建一个 CustomerExceptionFilter ,继承 Attribute, IExceptionFilter

 public class CustomerExceptionFilter : Attribute, IExceptionFilter

{

private readonly IHostingEnvironment _hostingEnvironment;

private readonly IModelMetadataProvider _modelMetadataProvider;

public CustomerExceptionFilter(IHostingEnvironment hostingEnvironment,

IModelMetadataProvider modelMetadataProvider)

{

_hostingEnvironment = hostingEnvironment;

_modelMetadataProvider = modelMetadataProvider;

}

/// <summary>

/// 发生异常进入

/// </summary>

/// <param name="context"></param>

public void OnException(ExceptionContext context)

{

if (!context.ExceptionHandled)//如果异常没有处理

{

if (_hostingEnvironment.IsDevelopment())//如果是开发环境

{

var result = new ViewResult { ViewName = "../Exception/Index" };

result.ViewData = new ViewDataDictionary(_modelMetadataProvider,

context.ModelState);

result.ViewData.Add("Exception", context.Exception);//传递数据

context.Result = result;

}

else

{

context.Result = new JsonResult(new

{

Result = false,

Code = 500,

Message = context.Exception.Message

});

}

context.ExceptionHandled = true;//异常已处理

}

}

}

回到刚刚的错误

[TypeFilter(typeof(CustomerExceptionFilter))]

public IActionResult Index()

{

var range = Enumerable.Range(1, 3).ToArray();

var result = range[4];

return View();

}

统一展示错误信息页

 public class ExceptionController : Controller

{

public IActionResult Index()

{

return View();

}

}

展示错误 

@{

ViewData["Title"] = "Index";

}

<h1>Index</h1>

@ViewData["Exception"]

 

谢谢

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