运行代码以使用c＃访问gmail API时获取filenotfound异常 [英] Getting filenotfound exception while running code to access gmail API using c#

问题描述

运行代码以使用c＃访问gmail API时出现filenotfound异常。我刚刚使用了google开发人员指南中提供的代码。请参阅下面的代码。

使用Google.Apis.Auth.OAuth2;

使用Google.Apis.Gmail.v1;

使用Google.Apis.Gmail.v1.Data;

使用Google.Apis.Services;

使用Google.Apis.Util.Store;

使用系统;

使用System.Collections.Generic;
$
使用System.IO;

使用System.Linq;

使用System.Text;

使用System.Threading;

使用System.Threading.Tasks;



命名空间GmailQuickstart

{

   课程计划

    {

        //如果要修改这些范围，请删除以前保存的凭据。
        // at~ / .credentials / gmail-dotnet-quickstart.json

        static string [] Scopes = {GmailService.Scope.GmailReadonly};

        static string ApplicationName =" Gmail API .NET Quickstart"; $


        static void Main（string [] args）

        {

            UserCredential凭证;



           使用（VAR流=

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;新的FileStream（QUOT; client_secret.json" ;, FileMode.Open，FileAccess.Read））<无线电通信/>
  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; {

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;串credPath = System.Environment.GetFolderPath（

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; System.Environment.SpecialFolder.Personal）;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; credPath = Path.Combine（credPath，" .credentials / gmail-dotnet-quickstart.json"）;
$


  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; credential = GoogleWebAuthorizationBroker.AuthorizeAsync（

           GoogleClientSecrets.Load（stream）.Secrets，

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;作用域，

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP ;"使用者" ;,

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP; CancellationToken.None，

&NBSP;&NBSP;          new FileDataStore（credPath，true））。结果;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; Console.WriteLine（"凭据文件保存到：" + credPath";）
  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; }


  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; //创建Gmail API服务。

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; var service = new GmailService（new BaseClientService.Initializer（）

       {

      ;&NBSP;&NBSP;&NBSP; HttpClientInitializer =凭证，

&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;应用程序名=应用程序名，

&NBSP;&NBSP ;    }）;
$


  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; //定义请求参数。

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; UsersResource.LabelsResource.ListRequest request = service.Users.Labels.List（" me"）;



  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; //列出标签。

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;的IList<标签> labels = request.Execute（）。标签;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; Console.WriteLine（" Labels："）;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; if（labels！= null&& labels.Count> 0）

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; {

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; foreach（标签中的var labelItem）

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; {

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; Console.WriteLine（" {0}"，labelItem.Name）;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; }¥b $ b  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; }¥b $ b  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP;否则

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; {

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; Console.WriteLine（"未找到标签。"）;

  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; }¥b $ b  &NBSP; &NBSP; &NBSP; &NBSP; &NBSP; Console.Read（）;
$


  &NBSP; &NBSP; &NBSP; }¥b $ b  &NBSP; }
}

尝试访问文件时发现文件未找到异常"client_secret.json" .Error在读取文件时执行并在行下面执行

 var stream =                new FileStream（" client_secret.json"，FileMode.Open，FileAccess.Read）

如何解决问题

解决方案

尝试提供所述路径例如

<预类= "prettyprint" 风格= "">变种文件名= Path.Combine（AppDomain.CurrentDomain.BaseDirectory，" client_secret.json"）;
if（File.Exists（fileName））
{
var stream = new FileStream（fileName，FileMode.Open，FileAccess.Read）
}

调整路径以满足您的需求。

Getting filenotfound exception while running code to access gmail API using c#.I have just used the code available in google developers guide.Please see below is the code.

using Google.Apis.Auth.OAuth2;
using Google.Apis.Gmail.v1;
using Google.Apis.Gmail.v1.Data;
using Google.Apis.Services;
using Google.Apis.Util.Store;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace GmailQuickstart
{
    class Program
    {
        // If modifying these scopes, delete your previously saved credentials
        // at ~/.credentials/gmail-dotnet-quickstart.json
        static string[] Scopes = { GmailService.Scope.GmailReadonly };
        static string ApplicationName = "Gmail API .NET Quickstart";

        static void Main(string[] args)
        {
            UserCredential credential;

            using (var stream =
                new FileStream("client_secret.json", FileMode.Open, FileAccess.Read))
            {
                string credPath = System.Environment.GetFolderPath(
                    System.Environment.SpecialFolder.Personal);
                credPath = Path.Combine(credPath, ".credentials/gmail-dotnet-quickstart.json");

                credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
                    GoogleClientSecrets.Load(stream).Secrets,
                    Scopes,
                    "user",
                    CancellationToken.None,
                    new FileDataStore(credPath, true)).Result;
                Console.WriteLine("Credential file saved to: " + credPath);
            }

            // Create Gmail API service.
            var service = new GmailService(new BaseClientService.Initializer()
            {
                HttpClientInitializer = credential,
                ApplicationName = ApplicationName,
            });

            // Define parameters of request.
            UsersResource.LabelsResource.ListRequest request = service.Users.Labels.List("me");

            // List labels.
            IList<Label> labels = request.Execute().Labels;
            Console.WriteLine("Labels:");
            if (labels != null && labels.Count > 0)
            {
                foreach (var labelItem in labels)
                {
                    Console.WriteLine("{0}", labelItem.Name);
                }
            }
            else
            {
                Console.WriteLine("No labels found.");
            }
            Console.Read();

        }
    }
}

File not found exception throwing when trying to access the file "client_secret.json" .Error throws while reading the file and performing below line

var stream =                new FileStream("client_secret.json", FileMode.Open, FileAccess.Read)

How to resolve the issue

解决方案

Try providing the path e.g.

var fileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "client_secret.json");
if (File.Exists(fileName))
{
    var stream = new FileStream(fileName, FileMode.Open, FileAccess.Read)
}

Adjust the path to fit your needs.

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