ASP .NET MVC - 文件上传大小限制的配置方法

<system.web>   
    <httpruntime requestlengthdiskthreshold="256" maxrequestlength="2097151" />
</system.web>   
  
<system.webServer>    
    <security>  
        <requestFiltering>
            <requestLimits maxAllowedContentLength="500000000" />  
        </requestFiltering>  
    </security>  
</system.webServer>