在C＃中创建MS Teams团队-AddAsync返回null

如何解决在C＃中创建MS Teams团队-AddAsync返回null

上下文：

我正在使用C＃中的MS Graph API创建新的MS Teams团队

我的代码：

var newTeam = new Team()
{
    displayName = model.displayName,Description = model.Description,AdditionalData = new Dictionary<string,object>
    {
        ["template@odata.bind"] = $"{graph.BaseUrl}/teamstemplates('standard')",["members"] = owners.ToArray()
    }
};

var team = await graph.Teams.Request().AddAsync(newTeam);

问题：

团队创建得很好，但我无法获得它的ID。 AddAsync方法的返回类型为Task<Team>，但始终返回null。我已经使用fiddler检查了服务器响应，发现在响应标头中返回了所创建团队的ID。

内容位置：/ teams（'cbf27e30-658b-4021-a8c6-4002b9adaf41'）

很遗憾，我不知道如何访问此信息。

解决方法

您将通过调用GET joined Teams获取您的teamId，它将获取团队ID，名称和说明

幸运的是，通过使用请求基类 BaseRequest 并自己发送它很容易实现。使用收到的 HttpResponseMessage，您将获得记录的标头 here，其中包含您的新团队的 ID。

代码还包括如何使用忙等待来等待团队创建完成 - 这不被视为最佳实践，但使示例更容易。更好的方法是存储团队 ID 并定期查询创建状态。

var newTeam = new Team()
{
    DisplayName = model.DisplayName,Description = model.Description,AdditionalData = new Dictionary<string,object>
    {
        ["template@odata.bind"] = $"{graph.BaseUrl}/teamsTemplates('standard')",["members"] = owners.ToArray()
    }
};

// we cannot use 'await client.Teams.Request().AddAsync(newTeam)'
// as we do NOT get the team ID back (object is always null) :(
BaseRequest request = (BaseRequest)graph.Teams.Request();
request.ContentType = "application/json";
request.Method = "POST";

string location;
using (HttpResponseMessage response = await request.SendRequestAsync(newTeam,CancellationToken.None))
    location = response.Headers.Location.ToString();

// looks like: /teams('7070b1fd-1f14-4a06-8617-254724d63cde')/operations('c7c34e52-7ebf-4038-b306-f5af2d9891ac')
// but is documented as: /teams/7070b1fd-1f14-4a06-8617-254724d63cde/operations/c7c34e52-7ebf-4038-b306-f5af2d9891ac
// -> this split supports both of them
string[] locationParts = location.Split(new[] { '\'','/','(',')' },StringSplitOptions.RemoveEmptyEntries);
string teamId = locationParts[1];
string operationId = locationParts[3];

// before querying the first time we must wait some secs,else we get a 404
int delayInMilliseconds = 5_000;
while (true)
{
    await Task.Delay(delayInMilliseconds);

    // lets see how far the teams creation process is
    TeamsAsyncOperation operation = await graph.Teams[teamId].Operations[operationId].Request().GetAsync();
    if (operation.Status == TeamsAsyncOperationStatus.Succeeded)
        break;

    if (operation.Status == TeamsAsyncOperationStatus.Failed)
        throw new Exception($"Failed to create team '{newTeam.DisplayName}': {operation.Error.Message} ({operation.Error.Code})");

    // according to the docs,we should wait > 30 secs between calls
    // https://docs.microsoft.com/en-us/graph/api/resources/teamsasyncoperation?view=graph-rest-1.0
    delayInMilliseconds = 30_000;
}

// finally,do something with your team...