这将创建一个称为AntiForgeryData的内部密封类的实例。

该实例被序列化为一个基于应用程序路径的64位编码版本的cookie“__RequestVerificationToken_”。

相同的AntiForgeryData实例被序列化为隐藏的输入。

AntiForgeryData的唯一部分是使用RNGCryptoServiceProvider.GetBytes()

所有这一切都可能在WebForms页面中被欺骗，唯一的混乱是隐藏的类的序列化。不幸的是，关键的方法(GetAntiForgeryTokenAndSetCookie)依赖于ViewContext.HttpContext.Request来获取cookie，而WebForm需要使用HttpContext.Current.Request。

更新

没有太多的测试和很多的代码，但我想我已经破解了一点反思。我使用反射的地方我已经离开了上面的等效线：

using System;
using System.Reflection;
using System.Web;
using System.Web.Mvc;

/// <summary>Utility to provide MVC anti forgery tokens in WebForms pages</summary>
public class WebFormAntiForgery
{
    /// <summary>Create an anti forgery token in a WebForms page</summary>
    /// <returns>The HTML input and sets the cookie</returns>
    public static string AntiForgeryToken()
    {
        string formValue = GetAntiForgeryTokenAndSetCookie();

        // string fieldName = AntiForgeryData.GetAntiForgeryTokenName(null);
        var mvcAssembly = typeof(HtmlHelper).Assembly;
        var afdType = mvcAssembly.GetType("System.Web.Mvc.AntiForgeryData");
        string fieldName = Convert.ToString(afdType.InvokeMember(
            "GetAntiForgeryTokenName",BindingFlags.NonPublic | BindingFlags.Static | BindingFlags.InvokeMethod,null,new object[] { null }));

        TagBuilder builder = new TagBuilder("input");
        builder.Attributes["type"] = "hidden";
        builder.Attributes["name"] = fieldName;
        builder.Attributes["value"] = formValue;
        return builder.ToString(TagRenderMode.SelfClosing);
    }

    static string GetAntiForgeryTokenAndSetCookie()
    {
        var mvcAssembly = typeof(HtmlHelper).Assembly;
        var afdType = mvcAssembly.GetType("System.Web.Mvc.AntiForgeryData");

        // new AntiForgeryDataSerializer();
        var serializerType = mvcAssembly.GetType("System.Web.Mvc.AntiForgeryDataSerializer");
        var serializerCtor = serializerType.GetConstructor(new Type[0]);
        object serializer = serializerCtor.Invoke(new object[0]); 

        // string cookieName = AntiForgeryData.GetAntiForgeryTokenName(HttpContext.Current.Request.ApplicationPath);
        string cookieName = Convert.ToString(afdType.InvokeMember(
            "GetAntiForgeryTokenName",new object[] { HttpContext.Current.Request.ApplicationPath }));

        // AntiForgeryData cookieToken;
        object cookieToken;
        HttpCookie cookie = HttpContext.Current.Request.Cookies[cookieName];
        if (cookie != null)
        {
            // cookieToken = Serializer.Deserialize(cookie.Value);
            cookieToken = serializerType.InvokeMember("Deserialize",BindingFlags.InvokeMethod,serializer,new object[] { cookie.Value });
        }
        else
        {
            // cookieToken = AntiForgeryData.NewToken();
            cookieToken = afdType.InvokeMember(
                "NewToken",BindingFlags.Public | BindingFlags.Static | BindingFlags.InvokeMethod,new object[0]);

            // string cookieValue = Serializer.Serialize(cookieToken);
            string cookieValue = Convert.ToString(serializerType.InvokeMember("Serialize",new object[] { cookieToken }));

            var newCookie = new HttpCookie(cookieName,cookieValue) { HttpOnly = true };

            HttpContext.Current.Response.Cookies.Set(newCookie);
        }

        // AntiForgeryData formToken = new AntiForgeryData(cookieToken)
        // {
        //     CreationDate = DateTime.Now,//     Salt = salt
        // };
        var ctor = afdType.GetConstructor(new Type[] { afdType });
        object formToken = ctor.Invoke(new object[] { cookieToken });

        afdType.InvokeMember("CreationDate",BindingFlags.SetProperty,formToken,new object[] { DateTime.Now });
        afdType.InvokeMember("Salt",new object[] { null });

        // string formValue = Serializer.Serialize(formToken);
        string formValue = Convert.ToString(serializerType.InvokeMember("Serialize",new object[] { formToken }));
        return formValue;
    }
}

用法类似于MVC：

WebFormAntiForgery.AntiForgeryToken()

它创建与MVC方法相同的cookie和相同的HTML。

我没有用盐和域方法打扰，但它们相当容易添加。