如果您只是想获取标准属性，建议您阅读有关 AXFetchAsSregTransform 的文章，该文章隐藏了AX和从您的站点收集SREG属性。

If you are just trying to get standard attributes, I recommend you read about the AXFetchAsSregTransform which hides the complexity of AX and SREG attribute gathering from your site.

如果您正在执行自定义操作，并且知道需要请求哪些AX属性，则示例代码如下：

If you are doing something custom and know what AX attributes you need to request, here is sample code:

var rp = new OpenIdRelyingParty();
var request = rp.CreateRequest("=some*identifier");
var ax = new FetchRequest();
ax.Attributes.AddRequired(WellKnownAttributes.Contact.Email);
request.AddExtension(ax);
request.RedirectToProvider();