C# REST API for Sharepoint search文档身份验证问题

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        string clientId = "YourClientId";
        string clientSecret = "YourClientSecret";
        string tenantId = "YourTenantId";
        string siteUrl = "YourSharepointSiteUrl";

        string accessToken = await GetAccessToken(clientId, clientSecret, tenantId);
        await SearchDocuments(accessToken, siteUrl);
    }

    static async Task<string> GetAccessToken(string clientId, string clientSecret, string tenantId)
    {
        using (HttpClient client = new HttpClient())
        {
            string url = $"https://login.microsoftonline.com/{tenantId}/oauth2/v2.0/token";
            string body = $"grant_type=client_credentials&client_id={clientId}&client_secret={clientSecret}&scope=https://graph.microsoft.com/.default";

            HttpResponseMessage response = await client.PostAsync(url, new StringContent(body));
            string responseContent = await response.Content.ReadAsStringAsync();

            // Parse the access token from the response
            // 注意：这里的解析代码需要根据实际返回的JSON结构进行修改
            string accessToken = "YourAccessToken";
            return accessToken;
        }
    }

    static async Task SearchDocuments(string accessToken, string siteUrl)
    {
        using (HttpClient client = new HttpClient())
        {
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);

            string url = $"{siteUrl}/_api/search/query?querytext='YourSearchQuery'";
            HttpResponseMessage response = await client.GetAsync(url);
            string responseContent = await response.Content.ReadAsStringAsync();

            // Process the search results
            // 注意：这里的处理代码需要根据实际返回的JSON结构进行修改
            Console.WriteLine(responseContent);
        }
    }
}