在 C# 中使用 MS Graph Site API 时出现内部服务器错误

问题描述

我正在尝试使用图形 API 在 SharePoint 上搜索文件。在 Microsoft graph-explorer 上获得正确的结果但是当我尝试使用 C# 时出现错误 Status Code: 500 Reason Phrase:Internal Server Error

回复详情如下：

{
"error": {
 "code": "System.NullReferenceException","message": "Object reference not set to an instance of an object.","innerError": {
  "date": "2021-03-19T16:16:28","request-id": "f3092cda-b813-4507-928e-7e2de84fc88f","client-request-id": "f3092cda-b813-4507-928e-7e2de84fc88f"
  }
 }
}

我正在使用的 C# 代码

var searchTerm = "164377_07323_03122021_112659_TaxApp";
var headerStr = @"{{""requests"": [{{""entityTypes"": [""listItem""],""query"": {{""queryString"": ""{0}""}}}}]}}";
headerStr = string.Format(headerStr,searchTerm);
var headerJson = JsonConvert.SerializeObject(headerStr);
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer",authResponse.AccessToken);
var content = new StringContent(headerJson,Encoding.UTF8,"application/json");
HttpResponseMessage response = httpClient.PostAsync("https://graph.microsoft.com/v1.0/search/query",content).Result;
var postResult = response.Content.ReadAsStringAsync().Result;

有什么我出错的地方吗？

解决方法

尝试使用以下代码。看起来您的代码被序列化了两次。所以我只是删除了序列化步骤并且它起作用了。

var searchTerm = "164377_07323_03122021_112659_TaxApp";
var headerStr = @"{{""requests"": [{{""entityTypes"": [""listItem""],""query"": {{""queryString"": ""{0}""}}}}]}}";
headerStr = string.Format(headerStr,searchTerm);
httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer",authResponse.AccessToken);
var content = new StringContent(headerStr,Encoding.UTF8,"application/json");
HttpResponseMessage response = httpClient.PostAsync("https://graph.microsoft.com/v1.0/search/query",content).Result;
var postResult = response.Content.ReadAsStringAsync().Result;

您始终可以使用 fiddler 测试 API 请求。