# C# 呼叫 Graph API 建立 List Items
在Azure Portal 的Azure Active Directory->應用程式註冊->選要用的應用程式或是新增註冊
接著，點API權限->新增權限->Microsoft Graph->應用程式權限->Sites->Sites.ReadWrite.All
若還沒設過密碼在憑證及秘密新增用戶端密碼這就是等下會用到的Client Secret
接著，在專案中[安裝Graph SDK](https://docs.microsoft.com/en-us/graph/sdks/sdk-installation)，可用NuGet Package Manager Console輸入指令

Install-Package Microsoft.Graph
Install-Package Microsoft.Graph.Auth -IncludePrerelease

[認證方式](https://docs.microsoft.com/en-us/graph/sdks/choose-authentication-providers?tabs=CS#client-credentials-provider)選擇用Client Credential，輸入這段程式碼

IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder
    .Create(clientID)
    .WithTenantId(tenantID)
    .WithClientSecret(clientSecret)
    .Build();

ClientCredentialProvider authProvider = new ClientCredentialProvider(confidentialClientApplication);

ClientID和TenantID可在剛剛的應用程式的概觀中找到
最後，跟著[範例](https://docs.microsoft.com/en-us/graph/api/listitem-create?view=graph-rest-1.0&tabs=csharp)貼上這段程式碼

GraphServiceClient graphClient = new GraphServiceClient( authProvider );

var listItem = new ListItem
{
	Fields = new FieldValueSet
	{
		AdditionalData = new Dictionary<string, object>()
		{
			{"標題", "內容"},
			{"標題", "內容"},
			{"標題", "內容"}
		}
	}
};

await graphClient.Sites["site-id"].Lists["list-id"].Items
	.Request()
	.AddAsync(listItem);

[SiteID](https://docs.microsoft.com/en-us/graph/api/resources/sharepoint?view=graph-rest-1.0#note-for-existing-sharepoint-developers) 為一組由hostname, siteCollection (SPSite) ID,root site (SPWeb) ID組成的唯一值
ListID為欲新增Item的列表名稱
###### tags: `.NetCore`