控制asp.net上传文件大小

在asp.net中可以通过两种方式控制上传文件大小：

1. web.config

设置maxRequestLength的值即可，单位是K，默认为4096 KB (4 MB)。其中executionTimeout指超时时间，单位是秒。apprequestqueuelimit为请求数。

<system.web> <httpRuntime maxRequestLength="1000000" executionTimeout="1000"/> </system.web>

2. 修改IIS站点的配置

在applicationHost.config或者IIS_schema.xml中有一段配置

 <element name="requestLimits"> <attribute name="maxAllowedContentLength" type="uint" defaultValue="30000000" /> <attribute name="maxUrl" type="uint" defaultValue="4096" /> <attribute name="maxQueryString" type="uint" defaultValue="2048" /> - <element name="headerLimits"> - <collection addElement="add" clearElement="clear" removeElement="remove"> <attribute name="header" type="string" required="true" isUniqueKey="true" validationType="nonEmptyString" /> <attribute name="sizeLimit" type="uint" required="true" /> </collection> </element> </element>

该文件位于C:/Windows/System32/inetsrv/config(Windows 2008),但是该文件无法直接修改，可以通过Appcmd命令进行处理:

appcmd set config "Default Web Site" -section:requestFiltering -requestLimits.maxallowedcontentLength:314572800 -commitpath:apphost

其中314572800为你要设置的限制大小，"Default Web Site"为ISS中需要设置的网站名称,可以在applicationHost.config中查看到：

<sites> <site name="Default Web Site" id="1" serverAutoStart="true"> <application path="/"> <virtualDirectory path="/" physicalPath="你的网站物理路径" /> </application> <bindings> <binding protocol="http" bindingInformation="*:80:" /> </bindings> </site> <site name="A" id="3" serverAutoStart="true"> <application path="/" applicationPool="A"> <virtualDirectory path="/" physicalPath="你的网站物理路径" /> </application> <bindings> <binding protocol="http" bindingInformation="*:8888:" /> </bindings> <limits connectionTimeout="00:05:00" /> </site> <site name="B" id="2" serverAutoStart="true"> <application path="/" applicationPool="B"> <virtualDirectory path="/" physicalPath="你的网站物理路径" /> </application> <bindings> <binding protocol="http" bindingInformation="*:9999:" /> </bindings> </site> <site name="C" id="4" serverAutoStart="true"> <application path="/" applicationPool="C"> <virtualDirectory path="/" physicalPath="你的网站物理路径" /> </application> <bindings> <binding protocol="http" bindingInformation="*:7777:" /> </bindings> <limits connectionTimeout="00:05:00" /> </site> <siteDefaults> <logFile logFormat="W3C" directory="%SystemDrive%/inetpub/logs/LogFiles" /> <traceFailedRequestsLogging directory="%SystemDrive%/inetpub/logs/FailedReqLogFiles" /> </siteDefaults> <applicationDefaults applicationPool="DefaultAppPool" /> <virtualDirectoryDefaults allowSubDirConfig="true" /> </sites>