文件上传大小限制

web.config文件

<system.web>
    <httpRuntime targetFramework="4.5" maxRequestLength="204800" useFullyQualifiedRedirectUrl="true" minFreeThreads="8" minLocalRequestFreeThreads="4" appRequestQueueLimit="100" enableVersionHeader="true" executionTimeout="6000" />
  </system.web>

<system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="2097152000" maxQueryString="5000" maxUrl="8000"></requestLimits>
      </requestFiltering>
    </security>
</system.webServer>