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Ok Paypal 让我发疯。我直接从 xcom 的最新区域（或者他们现在所说的任何东西）获取了他们的“示例代码”，并安装了 DLL 就好了。我正在做一个简单的 TransactionSearch，如下所示：

protected void btnSearch_Click(object sender, EventArgs e)
    {

        GenerateCodeSOAP.TransactionSearch t = new GenerateCodeSOAP.TransactionSearch();
        String mysearch = t.TransactionSearchnCode(Convert.ToDateTime(dtStart.Text), Convert.ToDateTime(dtEnd.Text), "05S08011830926906");
        Response.Write("Results:<br/>" + mysearch);
        lblStatus.Text = "Finished";
    }

这是我用我自己的 API 内容稍微修改的示例代码：

public class TransactionSearch
{
    public TransactionSearch()
    {

    }

    public string TransactionSearchnCode(DateTime startDate, DateTime endDate,string transactionId)
    {

        CallerServices caller = new CallerServices();
        IAPIProfile profile = ProfileFactory.createSignatureAPIProfile();       

        // Set up your API credentials, PayPal end point, and API version.
                    profile.APIUsername = "[removed for security]";
        profile.APIPassword = "[removed for security]";
        profile.APISignature = "[removed for security]";
        profile.Subject = "[removed for security]";
        profile.Environment = "live";

        // Create the request object.
        TransactionSearchRequestType concreteRequest = new TransactionSearchRequestType();          
        concreteRequest.Version="92.0";

        // Add request-specific fields to the request.
        concreteRequest.StartDate = startDate;
        concreteRequest.EndDate = endDate.AddHours(23).AddMinutes(59).AddSeconds(59);
        concreteRequest.EndDateSpecified = true;
        //concreteRequest.TransactionID=transactionId;

        // Execute the API operation and obtain the response.
        TransactionSearchResponseType pp_response=new TransactionSearchResponseType();
        pp_response= (TransactionSearchResponseType) caller.Call("TransactionSearch", concreteRequest);
        return pp_response.Ack.ToString();

    }
}

无论我尝试什么（你会看到我注释掉了 transactionid 只是为了给我一些东西）我在这一行得到一个 Object Reference Not Set 错误：

pp_response= (TransactionSearchResponseType) caller.Call("TransactionSearch", concreteRequest);

我知道这只是“示例代码”，但这似乎应该很简单。我通过沙箱尝试过，但显然没有用，所以我在自己的贝宝账户中有交易，所以我设置了 API 凭据，但它仍然无法正常工作。

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1 回答 1

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很久没有做过 Paypal，所以这更通用 - 调试并在行中放置一个断点 - 如果实际发出请求（或请求阻止发出请求的问题），您应该从 PayPal 获得一些错误响应。

于 2012-07-25T19:06:48.070 回答