最近发现在项目中使用jQuery.form插件上传比较大的文件时，上传不了，于是改了下web.config的上传文件最大限制。
<configuration> <system.web> <httpRuntime maxRequestLength="102400" executionTimeout="200" enable="true" /></system.web> </configuration>
改完后还是不能上传，最后在stackoverflow找到了答案，原来还要配置服务端的最大文件限制。
譬如限制最大文件为100M
<configuration> <system.web> <httpRuntime maxRequestLength="102400" executionTimeout="200" enable="true" /></system.web> </configuration><system.webServer> <security> <requestFiltering> <requestLimits maxAllowedContentLength="104857600" /> </requestFiltering> </security> </system.webServer>
you are hosted in IIS, you need two settings:
maxRequestLength- for (measured in KB)maxAllowedContentLength- for IIS (measured in Bytes)
Error handling
Both throws different exceptions.
maxRequestLength- Whenever a file exceeds this setting, you'll get an Application_Error (standard ASP error)maxAllowedContentLength- Whenever a file exceeds this setting, you'll get IIS error.
The IIS error is harder to debug, so it is advisable that you set themaxAllowedContentLengthlarger.maxRequestLengthis easier to catch since its at application level.
stackoverflow答案地址：/questions/23327338/maxrequestlength-for-net-4-5-1-framework
