使用asp.net mvc2检测浏览器

Question

在普通的asp.net中,以下工作原理:

   private float getInternetExplorerVersion()
{
  // Returns the version of Internet Explorer or a -1
  // (indicating the use of another browser).
  float rv = -1;
  System.Web.HttpBrowserCapabilities browser = Request.Browser;
  if (browser.Browser == "IE")
    rv = (float)(browser.MajorVersion + browser.MinorVersion);
  return rv;
}

但是在asp.net中,mvc2在"System.Web.HttpBrowserCapabilities browser = Request.Browser;"中给出错误:

无法将类型'System.Web.HttpBrowserCapabilitiesBase'隐式转换为'System.Web.HttpBrowserCapabilities'

谢谢阿纳布

Answer 1

那是因为Browser属性是类型HttpBrowserCapabilitiesBase而不是HttpBrowserCapabilities.因此要么使用隐式,var要么指定正确的类型:

float rv = -1;
var browser = Request.Browser;
if (browser.Browser == "IE")
    rv = (float)(browser.MajorVersion + browser.MinorVersion);

或者如果您更喜欢输入大量代码:

float rv = -1;
System.Web.HttpBrowserCapabilitiesBase browser = Request.Browser;
if (browser.Browser == "IE")
    rv = (float)(browser.MajorVersion + browser.MinorVersion);