Question

我在这两行中收到错误消息：

SignedData = verify.SignedDataverify;
Signature = verify.Signatureverify;

错误CS1061：“ IInAppBillingVerifyPurchase”不包含“ SignedDataverify”的定义，找不到可以接受类型为“ IInAppBillingVerifyPurchase”的第一个参数的扩展方法“ SignedDataverify”（是否缺少using指令或程序集引用？）

错误CS1061：“ IInAppBillingVerifyPurchase”不包含“ Signatureverify”的定义，找不到可以接受类型为“ IInAppBillingVerifyPurchase”的第一个参数的扩展方法“ Signatureverify”（您是否缺少using指令或程序集引用？）

如何获取两个字符串变量SignedDataverify和Signatureverify的值？我不知道如何获取值，因为它们不在同一类中。

在此类中，我想获取SignedDataverify和Signatureverify的值：

更新：此代码有效。

    string SignedData = "", Signature = "";

    public async Task<bool> PurchaseItem(string productId)
    {
        var purchaseSuccesful = false;

        if (CrossInAppBilling.IsSupported == true)
        {
            var billing = CrossInAppBilling.Current;
            try
            {
                var connected = await billing.ConnectAsync(ItemType.InAppPurchase);
                if (connected == true)
                {
                    var verify = DependencyService.Get<IInAppBillingVerifyPurchase>();
                    var purchase = await billing.PurchaseAsync(productId, ItemType.InAppPurchase, "apppayload", verify);
                    SignedData = ((Verify)verify).SignedDataverify;
                    Signature = ((Verify)verify).Signatureverify;

                    ...

Verify.cs：

using System.Threading.Tasks;
using Plugin.InAppBilling.Abstractions;
using InapppurchaseTest;

namespace InapppurchaseTest
{
public class Verify : IInAppBillingVerifyPurchase
{
    const string key1 = @"XOR_key1";
    const string key2 = @"XOR_key2";
    const string key3 = @"XOR_key3";

    public string SignedDataverify = "", Signatureverify = "";

    public Task<bool> VerifyPurchase(string signedData, string signature, string productId = null, string transactionId = null)
    {
    #if __ANDROID__
        var key1Transform = Plugin.InAppBilling.InAppBillingImplementation.InAppBillingSecurity.TransformString(key1, 1);
        var key2Transform = Plugin.InAppBilling.InAppBillingImplementation.InAppBillingSecurity.TransformString(key2, 2);
        var key3Transform = Plugin.InAppBilling.InAppBillingImplementation.InAppBillingSecurity.TransformString(key3, 3);
        SignedDataverify = signedData;
        Signatureverify = signature
        return Task.FromResult(Plugin.InAppBilling.InAppBillingImplementation.InAppBillingSecurity.VerifyPurchase(key1Transform + key2Transform + key3Transform, signedData, signature));
    #else
        SignedDataverify = signedData;
        Signatureverify = signature;
        return Task.FromResult(true);
    #endif
    }
}
}

https://github.com/jamesmontemagno/InAppBillingPlugin/blob/master/docs/SecuringPurchases.md

Answer 1

如果“ DependencyService.Get（）”方法返回对“ IInAppBillingVerifyPurchase”的引用，则“验证”需要转换为“验证”类，因为“ SignedDataverify”和“ Signatureverify”是该类的成员。

尝试：

 SignedData = ((Verify)verify).SignedDataverify;
 Signature = ((Verify)verify).Signatureverify;

或

 SignedData = (verify as Verify)?.SignedDataverify;
 Signature = (verify as Verify)?.Signatureverify;

（如果强制转换失败，后一种方法将返回null，前一种方法将引发异常-由于您的代码位于try-catch语句中，因此您可能会乐于捕捉异常或更喜欢使用null检查）

如何获得不在同一个类中的字符串的值？

1 个答案: