c# - 为什么我对 Google 自定义搜索 API 的调用失败并显示请求错误(无效参数)？

Question

我需要获得谷歌搜索的结果才能循环并解析它们。考虑到这个目标，我遵循了(尽我所能)如何做到这一点的教程 here
这是我的代码，基于上面引用的文章中的示例/示例代码:

private void btnRentFlick_Click(object sender, EventArgs e)
{
    OpenBestPageForSearchString("rent amazon movie Will Penny");
}

private void OpenBestPageForSearchString(string searchStr)
{
    try
    {
        const string apiKey = "blaBlaBla"; // "blaBlaBla" stands for my API key
        const string searchEngineId = "bla"; // "bla" stands for various things I tried: my client_id 
            (also called UniqueId), private_key_id (also called KeyId), and project_id. Not having 
             the correct value may be the problem. If so, how do I get it?
        const string query = "rent amazon movie Will Penny"; 
        var customSearchService = new CustomsearchService(new BaseClientService.Initializer { ApiKey 
                                                                                        = apiKey });
        //CseResource.ListRequest listRequest = customSearchService.Cse.List(query); // This is the 
          code in the article, but it won't compile - "no overload for "List" takes one argument"
        // So how is the value in "query" assigned, then?
                
        CseResource.ListRequest listRequest = customSearchService.Cse.List(); 
        listRequest.Cx = searchEngineId;

        List<string> linksReturned = new List<string>();

        IList<Result> paging = new List<Result>();
        var count = 0; // I don't know what the purpose of the counting is, but I'll leave as-is 
            until I get it working at least
        while (paging != null)
        {
            listRequest.Start = count * 10 + 1;
            paging = listRequest.Execute().Items; // this takes several seconds, then it throws an       
                                                     exception
            if (paging != null)
            {
                foreach (var item in paging)
                {
                    linksReturned.Add("Title : " + item.Title + Environment.NewLine + "Link : " + 
                        item.Link +
                        Environment.NewLine + Environment.NewLine);
                }    
            }
            count++;
        }
            MessageBox.Show("Done with google amazon query");
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }    
    }

正如该行末尾的注释所说，这行代码:

paging = listRequest.Execute().Items; 

...工作几秒钟，然后抛出异常，即:

那么是什么导致了这个异常呢？是不是因为我分配的searchEngineId 值不好？还是因为搜索字符串(分配给查询变量)尚未提供给调用？
关于我的 Id 的信息包含在 google 提供的 .json 文件中，其中没有“searchEngineId”值。这是它包含的内容:

"type": "service_account", "project_id": "flix4famsasinlocator",
"private_key_id": "[my private key id]", "private_key": "-----BEGINPRIVATE KEY-----. . . PRIVATE KEY-----\n", "client_email":"[bla].gserviceaccount.com", "client_id": "[my client Id]",
"auth_uri": "https://accounts.google.com/o/oauth2/auth",
"token_uri": "https://oauth2.googleapis.com/token",
"auth_provider_x509_cert_url":"https://www.googleapis.com/oauth2/v1/certs",
"client_x509_cert_url":"https://www.googleapis.com/robot/v1/metadata/x509/[bla]gserviceaccount.com"

因此，虽然前面提到的文章声称是，而且乍一看似乎正是医生所要求的，但我遇到了相当大的墙。有没有人知道如何缩放这堵墙——也许主要是通过向 CseResource.ListRequest 对象提供搜索字符串？
更新
首先尝试 DalmTo 的代码，我使用了这个(没有显示他的 GetService() 方法，我逐字复制):

var query = "rent amazon movie Will Penny";

var service = GetService("theRainInSpainFallsMainlyOnTheDirt");

var request = service.Cse.List();

// add option values to the request here.
request.ExactTerms = query;
request.Q = query;

var response = request.ExecuteAsync();
// my contribution:
List<string> linksReturned = new List<string>();

foreach (var item in response.Result.Items)
{
    //Console.WriteLine(item.Title);
    // next two lines also mine
    MessageBox.Show(string.Format("Title: {0}; Link: {1}; ETag: {2}", item.Title, item.Link, item.ETag));
    linksReturned.Add(item.Link);
}

...但是这个异常是在 foreach 循环中抛出的:

更新 2
是的，这有效(改编自 Trekco 的回答):

const string apiKey = "gr8GooglyMoogly";
const string searchEngineId = "theRainInSpainFallsMainOnTheDirt"; 
const string query = "rent amazon movie Will Penny";
var customSearchService = new CustomsearchService(new BaseClientService.Initializer { ApiKey = apiKey });
CseResource.ListRequest listRequest = customSearchService.Cse.List();
listRequest.Cx = searchEngineId;
listRequest.Q = query;
List<string> linksReturned = new List<string>();

IList<Result> paging = new List<Result>();
var count = 0; 
while (paging != null)
{
    listRequest.Start = count * 10 + 1;
    paging = listRequest.Execute().Items; 
    if (paging != null)
    {
        foreach (var item in paging)
        {
            linksReturned.Add(item.Link);
        }
    }
    count++;
}

Answer 1

查询没有发送到谷歌。要修复您的代码，您需要告诉 api 使用什么查询。后 listRequest.Cx = searchEngineId;添加 listRequest.Q = query;

var count = 0;
string apiKey = "THE API KEY";
string searchEngineId = "THE SEARCH ENGIN ID";
string query = "rent amazon movie Will Penny";

var customSearchService = new CustomsearchService(new BaseClientService.Initializer
{
    ApiKey = apiKey
});

CseResource.ListRequest listRequest = customSearchService.Cse.List();
listRequest.Cx = searchEngineId;
listRequest.Q = query; // <---- Add this line

List<string> linksReturned = new List<string>();

while (count < 10) // Google limit you to 100 records
{
    listRequest.Start = count * 10;
    var paging = listRequest.Execute().Items; 
    
    foreach (var item in paging)
    {
        linksReturned.Add("Title : " + item.Title + Environment.NewLine + "Link : " +
                          item.Link +
                          Environment.NewLine + Environment.NewLine);
    }

    count++;
}

在您的代码中，您有一条您不知道是什么的评论 var count = 0;是为了。它用于跟踪您请求的项目数量。
如果您查看 google 的文档，您会发现它们最多只返回 100 个结果。之后他们会给你一个错误。该错误也将是相同的通用消息:“INVALID_ARGUMENT”
您可以在此处查看自定义搜索 API 要求: https://developers.google.com/custom-search/v1/reference/rest/v1/cse/list searchEngineId变量是您在网站上生成的搜索引擎 ID https://www.google.com/cse/all .您遵循的文档有点过时了。您将在此处找到 ID: