在UWP应用中如何使用Microsoft Graph上传和下载OneDrive文件？使用Graph可以调用微软的office，OneDrive，联系人，邮件，日历等很多的接口，因此使用Graph是非常方便的一种做法来开发win10 UWP应用。这是我开发过程中使用OneDrive的方法，记录下来。本篇先讲述如何使用Microsoft Graph登陆账户。
一、首先，使用Microsoft Graph，需要安装两个Nuget包。
Microsoft.Graph; Microsoft.Identity.Client;(搜索时需要勾选“包括预发行版”，否则找不到）
二、注册ClientID（apps.dev.microsoft.com）
- 打开上面地址后，登陆后，点击“添加应用”
- 创建应用后，获取你自己的“应用程序ID”和“自定义重定向URL”。（不要使用我举例的这个，需要获取自己的）
“应用程序Id”：9a032f4d-b5bb-49f7-8156-fb387b43ff94 “自定义重定向URL”：msal9a032f4d-b5bb-49f7-8156-fb387b43ff94://auth 三、登陆和退出 1.我将获取令牌和退出写成了一个类（MicrosoftGraphHelper），便于调用。
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| using Microsoft.Graph;
using Microsoft.Identity.Client;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
namespace Microsoft\_Graph\_Demo
{
public class MicrosoftGraphHelper
{
static string ClientId = "9a032f4d-b5bb-49f7-8156-fb387b43ff94";
public static string\[\] Scopes = { "User.Read" };
public static PublicClientApplication IdentityClientApp = new PublicClientApplication(ClientId);
public static string TokenForUser = null;
public static DateTimeOffset Expiration;
private static GraphServiceClient graphClient = null;
public static GraphServiceClient GetAuthenticatedClient()
{
if (graphClient == null)
{
try
{
graphClient = new GraphServiceClient(
"https://graph.microsoft.com/v1.0",
new DelegateAuthenticationProvider(
async (requestMessage) =>
{
var token = await GetTokenForUserAsync();
requestMessage.Headers.Authorization = new AuthenticationHeaderValue("bearer", token);
}));
return graphClient;
}
catch (Exception ex)
{
Debug.WriteLine("Could not create a graph client: " + ex.Message);
}
}
return graphClient;
}
public static async Task GetTokenForUserAsync()
{
AuthenticationResult authResult;
try
{
authResult = await IdentityClientApp.AcquireTokenSilentAsync(Scopes, IdentityClientApp.Users.First());
TokenForUser = authResult.AccessToken;
}
catch (Exception)
{
if (TokenForUser == null Expiration <= DateTimeOffset.UtcNow.AddMinutes(5))
{
authResult = await IdentityClientApp.AcquireTokenAsync(Scopes);
TokenForUser = authResult.AccessToken;
Expiration = authResult.ExpiresOn;
}
}
return TokenForUser;
}
public static void SignOut()
{
foreach (var user in IdentityClientApp.Users)
{
IdentityClientApp.Remove(user);
}
graphClient = null;
TokenForUser = null;
}
}
}
|
2.登陆，并获取登陆账户信息 MainPage.xaml
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| <button name="LoginButton"></button>
<button name="SignOutButton"></button>
|
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| MainPage.xaml.cs
private async void LoginButton\_Click(object sender, RoutedEventArgs e)
{
try
{
var graphClient = MicrosoftGraphHelper.GetAuthenticatedClient();
if (graphClient != null)
{
var user = await graphClient.Me.Request().GetAsync();
ResultTextBlock.Text = user.DisplayName + "-" + user.UserPrincipalName; }
else { ResultTextBlock.Text = "GraphClient = null"; } }
catch (MsalException) { ResultTextBlock.Text = "Login Failed"; } }
private void SignOutButton\_Click(object sender, RoutedEventArgs e)
{
try
{
MicrosoftGraphHelper.SignOut();
ResultTextBlock.Text = "Sign Out Success"; }
catch (Exception)
{
ResultTextBlock.Text = "Sign Out Failed";
}
}
|
以上就完成了Microsoft Graph的登陆，效果如下：
使用Microsoft Graph上传和下载文件到OneDrive将在下一篇文章中介绍。
本文Demo:
OneDrive: 链接：Microsoft-Graph-Demo.rar
百度云：链接：Microsoft-Graph-Demo.rar 密码：m5kp
