51CTO部落格地址：https://blog.51cto.com/1396817

部落格園部落格地址：https://www.cnblogs.com/bxapollo

很多開發者習慣使用CSOM來新建SPO Site，但是新建Microsoft 365 Group Site時，會發現CSOM根本不支援Microsoft 365 Group Site，Template為Group#0的建立，會遇到如下錯誤：

Microsoft.SharePoint.Client.ServerException
HResult=0x80131500
Message=The web template GROUP#0 is not available for sites on this tenant.
Source=Microsoft.SharePoint.Client.Runtime
StackTrace:
at Microsoft.SharePoint.Client.ClientRequest.ProcessResponseStream(Stream responseStream)
at Microsoft.SharePoint.Client.ClientRequest.ProcessResponse()
at Microsoft.SharePoint.Client.ClientRequest.ExecuteQueryToServer(ChunkStringBuilder sb)
at Microsoft.SharePoint.Client.ClientContext.ExecuteQuery()

解決方案：這種情況下，我們只能使用Graph API 來新建Group#0的Team Site。

實施步驟：

1. 在AAD中新建Native App

2. 複製App ID，需要新增到後續的code中

3. 授權Graph API Permission：

Groups.ReadWite.All, Directory.ReadWrite.All, openid, Team.Create, User.Read

4. 示例程式碼：

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Collections.Generic;
using System.Threading.Tasks;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System.Text;

namespace CreateGroupMultiGeo
{
    class Program
    {
        static async Task Main(string[] args)
        {
            string clientId = "50168119-04dd-0000-0000-000000000000";
            string email = "[email protected]";
            string passwordStr = "password";

            var req = new HttpRequestMessage(HttpMethod.Post, "https://login.microsoftonline.com/bc8dcd4c-0d60-0000-0000-000000000000/oauth2/token")
            {
                Content = new FormUrlEncodedContent(new Dictionary<string, string>
                {
                    ["resource"] = "https://graph.microsoft.com",
                    ["grant_type"] = "password",
                    ["client_id"] = clientId,
                    ["username"] = email,
                    ["password"] = passwordStr,
                    ["scope"] = "openid"
                })
            };

            HttpClient httpClient = new HttpClient();

            var res = await httpClient.SendAsync(req);

            string json = await res.Content.ReadAsStringAsync();

            if (!res.IsSuccessStatusCode)
            {
                throw new Exception("Failed to acquire token: " + json);
            }
            var result = (JObject)JsonConvert.DeserializeObject(json);
            //create a group

            HttpClient httpClientGroup = new HttpClient();

            httpClientGroup.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", result.Value<string>("access_token"));

            // Create a string variable and get user input from the keyboard and store it in the variable
            string grpName = "MultiGeoGraphAPIGrp1";

            string contentGroup = @"{
              'displayName': '" + grpName + @"',"
              + @"'groupTypes': ['Unified'],
              'mailEnabled': true,
              'mailNickname': '" + grpName + @"',"
              + @"'securityEnabled': false,
              'visibility':'Public',
              'preferredDataLocation':'GBR',
              '[email protected]': ['https://graph.microsoft.com/v1.0/users/ecc0fc81-244b-0000-0000-000000000000']
            }";

            var httpContentGroup = new StringContent(contentGroup, Encoding.GetEncoding("utf-8"), "application/json");

            var responseGroup = httpClientGroup.PostAsync("https://graph.microsoft.com/v1.0/groups", httpContentGroup).Result;

            var content = await responseGroup.Content.ReadAsStringAsync();

            dynamic grp = JsonConvert.DeserializeObject<object>(content);

            Console.WriteLine(responseGroup.Content.ReadAsStringAsync().Result);

            System.Threading.Thread.Sleep(3000);

            //create a Team

            HttpClient httpClientTeam = new HttpClient();

            httpClientTeam.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", result.Value<string>("access_token"));

            //create a team

            string contentTeam = @"{ 
                'memberSettings': { 
                    'allowCreateUpdateChannels': true
                }, 
                'messagingSettings': { 
                    'allowUserEditMessages': true, 
                    'allowUserDeleteMessages': true 
                }, 
                'funSettings': { 
                    'allowGiphy': true, 
                    'giphyContentRating': 'strict' 
                }
            }";

            var httpContentTeam = new StringContent(contentTeam, Encoding.GetEncoding("utf-8"), "application/json");

            ////Refere: https://docs.microsoft.com/en-us/graph/api/team-put-teams?view=graph-rest-1.0&tabs=http
            var responseTeam = httpClientTeam.PutAsync(@"https://graph.microsoft.com/v1.0/groups/" + grp.id + @"/team", httpContentTeam).Result;

            Console.WriteLine(responseTeam.Content.ReadAsStringAsync().Result);

            Console.ReadKey();
        }
    }
}

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