C# Exchange 自用收发邮件工具类

网上找了好久的代码，结合微软的文档和网上代码总结下来这个工具类（对邮件的附件的操作暂时没有写，以后用到了再补上）

using Microsoft.Exchange.WebServices.Data;
using System;
using System.Collections.Generic;

public class EmailUtil
{
    /// <summary>
    /// 回调函数
    /// </summary>
    /// <param name="args"></param>
    public delegate void CallBack(params object[] args);

    private ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1);

    public EmailUtil(string email_user, string email_pwd)
    {
        service.Credentials = new WebCredentials(email_user, email_pwd);
        service.UseDefaultCredentials = true;
        service.AutodiscoverUrl(email_user, RedirectionUrlValidationCallback);
    }


    /// <summary>
    /// 这个是和证书验证有关的东西，不用管，固定这么写
    /// </summary>
    /// <param name="redirectionUrl"></param>
    /// <returns></returns>
    private bool RedirectionUrlValidationCallback(string redirectionUrl)
    {
        bool result = false;
        Uri redirectionUri = new Uri(redirectionUrl);
        if (redirectionUri.Scheme == "https")
        {
            result = true;
        }
        return result;
    }

    /// <summary>
    /// 发送邮件
    /// </summary>
    /// <param name="subjetc">主旨</param>
    /// <param name="body">内容</param>
    /// <param name="toAddress">邮箱地址";"隔开 必填</param>
    /// <param name="ccAddress">邮箱地址";"隔开 没有就写空</param>
    public void SendMail(string subjetc, string body, string toAddress, string ccAddress)
    {
        EmailMessage email = new EmailMessage(service);

        string[] tempStr = toAddress.Split(';');
        for (int i = 0; i < tempStr.Length; i++)
        {
            if (string.IsNullOrEmpty(tempStr[i]))
            {
                continue;
            }
            email.ToRecipients.Add(tempStr[i]);
        }

        //副本没写就不做处理
        if (!string.IsNullOrEmpty(ccAddress))
        {
            tempStr = ccAddress.Split(';');
            for (int i = 0; i < tempStr.Length; i++)
            {
                if (string.IsNullOrEmpty(tempStr[i]))
                {
                    continue;
                }
                email.CcRecipients.Add(tempStr[i]);
            }
        }
        
        email.Subject = subjetc;
        email.Body = new MessageBody(body);
        email.Send();
    }



    /// <summary>
    /// 根据文件夹名获取文件id
    /// </summary>
    /// <param name="folderName"></param>
    /// <param name="wellKnownFolderName"></param>
    /// <param name="exchangeService"></param>
    /// <returns></returns>
    private FolderId GetFolderIdByFolderName(string folderName, WellKnownFolderName wellKnownFolderName)
    {
        FolderView folderView = new FolderView(10);
        FindFoldersResults folders = service.FindFolders(wellKnownFolderName, folderView);
        for (int i = 0; i < folders.Folders.Count; i++)
        {
            if (folders.Folders[i].DisplayName == folderName)
            {
                return folders.Folders[i].Id;
            }
        }
        return null;
    }


    /// <summary>
    /// 过滤器(有需求还可以再加)
    /// </summary>
    /// <returns></returns>
    private SearchFilter SetFilter(DateTime startTime, DateTime endTime, string subject)
    {
        List<SearchFilter> searchFilterCollection = new List<SearchFilter>();
        SearchFilter start = new SearchFilter.IsGreaterThanOrEqualTo(ItemSchema.DateTimeCreated, startTime);
        SearchFilter end = new SearchFilter.IsLessThanOrEqualTo(ItemSchema.DateTimeCreated, endTime);
        SearchFilter name = new SearchFilter.IsEqualTo(ItemSchema.Subject, subject);

        searchFilterCollection.Add(start);
        searchFilterCollection.Add(end);
        searchFilterCollection.Add(name);
        SearchFilter filter = new SearchFilter.SearchFilterCollection(LogicalOperator.And, searchFilterCollection.ToArray());
        return filter;
    }


    /// <summary>
    /// 寻找邮件
    /// </summary>
    /// <param name="startDate">邮件开始时间(这个时间开始的)</param>
    /// <param name="endDate">邮件结束时间（这个时间结束的）</param>
    /// <param name="folderName">邮箱下的文件夹名字(如果直接拿收件匣下的邮件就填空)</param>
    /// <param name="subject">等于这个标题的</param>
    /// <param name="callBack">回调</param>
    /// <param name="args">回调参数</param>
    public void FindMail(DateTime startDate, DateTime endDate, string folderName, string subject, CallBack callBack, params object[] args)
    {
        //建立筛选器
        SearchFilter searchFilter = SetFilter(startDate, endDate, subject);

        ItemView itemView = new ItemView(30);
        FindItemsResults<Item> items;

        //寻找符合对象的条件的邮件
        if (!string.IsNullOrEmpty(folderName))
        {
            //通过邮件中的文件夹名字获取文件夹id
            FolderId folderId = GetFolderIdByFolderName(folderName, WellKnownFolderName.Inbox);

            items = service.FindItems(folderId, searchFilter, itemView);
        }
        else
        {
            items = service.FindItems(WellKnownFolderName.Inbox, searchFilter, itemView);
        }


        for (int i = 0; i < items.TotalCount; i++)
        {
            items.Items[i].Load(PropertySet.FirstClassProperties);
            string content = items.Items[i].Body.Text;//邮件内容

            //items.Items[i].Delete(DeleteMode.HardDelete/*这是删除邮件,有三个选项，具体看dll的注释*/);
            if (callBack != null)
            {
                callBack(content, args);
            }
        }
    }
}