如何在SSIS脚本任务中为HTML邮件添加多个附件？

你的现有代码仅支持添加单个附件，要实现批量添加竖线分隔的附件列表，只需修改核心逻辑，拆分字符串后循环添加附件即可。以下是修改后的完整代码：

#region Help:  Introduction to the script task
/* The Script Task allows you to perform virtually any operation that can be accomplished in
* a .Net application within the context of an Integration Services control flow. 
* 
* Expand the other regions which have "Help" prefixes for examples of specific ways to use
* Integration Services features within this script task. */
#endregion 
#region Namespaces
using System;
using System.Data;
using Microsoft.SqlServer.Dts.Runtime;
using System.Windows.Forms;
using System.Net;
using System.Net.Mail;
using System.IO; // 添加IO命名空间，用于文件操作
using System.Linq; // 添加Linq命名空间，用于过滤空路径
#endregion 

namespace ST_3806baf576ce4ad1ab06519f6706197b
{
    /// <summary>
    /// ScriptMain is the entry point class of the script.  Do not change the name, attributes,
    /// or parent of this class.
    /// </summary>
    [Microsoft.SqlServer.Dts.Tasks.ScriptTask.SSISScriptTaskEntryPointAttribute]
    public partial class ScriptMain : Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTARTScriptObjectModelBase
    {
        #region Help:  Using Integration Services variables and parameters in a script
        /* To use a variable in this script, first ensure that the variable has been added to 
         * either the list contained in the ReadOnlyVariables property or the list contained in 
         * the ReadWriteVariables property of this script task, according to whether or not your
         * code needs to write to the variable.  To add the variable, save this script, close this instance of
         * Visual Studio, and update the ReadOnlyVariables and 
         * ReadWriteVariables properties in the Script Transformation Editor window.
         * To use a parameter in this script, follow the same steps. Parameters are always read-only.
         * 
         * Example of reading from a variable:
         *  DateTime startTime = (DateTime) Dts.Variables["System::StartTime"].Value;
         * 
         * Example of writing to a variable:
         *  Dts.Variables["User::myStringVariable"].Value = "new value";
         * 
         * Example of reading from a package parameter:
         *  int batchId = (int) Dts.Variables["$Package::batchId"].Value;
         *  
         * Example of reading from a project parameter:
         *  int batchId = (int) Dts.Variables["$Project::batchId"].Value;
         * 
         * Example of reading from a sensitive project parameter:
         *  int batchId = (int) Dts.Variables["$Project::batchId"].GetSensitiveValue();
         * */         
        #endregion         
        #region Help:  Firing Integration Services events from a script
        /* This script task can fire events for logging purposes.
         * 
         * Example of firing an error event:
         *  Dts.Events.FireError(18, "Process Values", "Bad value", "", 0);
         * 
         * Example of firing an information event:
         *  Dts.Events.FireInformation(3, "Process Values", "Processing has started", "", 0, ref fireAgain)
         * 
         * Example of firing a warning event:
         *  Dts.Events.FireWarning(14, "Process Values", "No values received for input", "", 0);
         * */
        #endregion         
        #region Help:  Using Integration Services connection managers in a script
        /* Some types of connection managers can be used in this script task.  See the topic 
         * "Working with Connection Managers Programatically" for details.
         * 
         * Example of using an ADO.Net connection manager:
         *  object rawConnection = Dts.Connections["Sales DB"].AcquireConnection(Dts.Transaction);
         *  SqlConnection myADONETConnection = (SqlConnection)rawConnection;
         *  //Use the connection in some code here, then release the connection
         *  Dts.Connections["Sales DB"].ReleaseConnection(rawConnection);
         *
         * Example of using a File connection manager
         *  object rawConnection = Dts.Connections["Prices.zip"].AcquireConnection(Dts.Transaction);
         *  string filePath = (string)rawConnection;
         *  //Use the connection in some code here, then release the connection
         *  Dts.Connections["Prices.zip"].ReleaseConnection(rawConnection);
         * */
        #endregion 

        /// <summary>
        /// This method is called when this script task executes in the control flow.
        /// Before returning from this method, set the value of Dts.TaskResult to indicate success or failure.
        /// To open Help, press F1.
        /// </summary>
        public void Main()
        {
            string htmlMessageFrom = Dts.Variables["$Package::parFromLine"].Value.ToString();
            string htmlMessageTo = Dts.Variables["$Package::parToLine"].Value.ToString();
            string htmlMessageSubject = Dts.Variables["$Package::parSubject"].Value.ToString();
            string htmlMessageBody = Dts.Variables["$Package::parBody"].Value.ToString();
            string smtpServer = "mail.mydomain.com";         

            SendMailMessage(htmlMessageFrom, htmlMessageTo, htmlMessageSubject, htmlMessageBody, true, smtpServer);         
            Dts.TaskResult = (int)ScriptResults.Success;         
        }         

        private void SendMailMessage(string From, string SendTo, string Subject, string Body, bool IsBodyHtml, string Server)
        {
            // 获取附件参数和项目级源文件夹路径
            string attachFilesStr = Dts.Variables["$Package::parAttachment"].Value.ToString();
            string folderSource = Dts.Variables["$Project::parFolderSource"].Value.ToString();

            // 拆分竖线分隔的路径，过滤空字符串和首尾空格
            string[] attachPaths = attachFilesStr.Split('|')
                                                .Select(path => path.Trim())
                                                .Where(path => !string.IsNullOrEmpty(path))
                                                .ToArray();

            // 使用using语句自动释放MailMessage和SmtpClient资源
            using (MailMessage htmlMessage = new MailMessage(From, SendTo, Subject, Body))
            using (SmtpClient mySmtpClient = new SmtpClient(Server))
            {
                htmlMessage.IsBodyHtml = IsBodyHtml;

                foreach (string path in attachPaths)
                {
                    // 拼接完整路径：如果是相对路径，结合项目源文件夹；如果是绝对路径则直接使用
                    string fullPath = Path.IsPathRooted(path) ? path : Path.Combine(folderSource, path);

                    // 校验文件是否存在，避免发送失败
                    if (File.Exists(fullPath))
                    {
                        using (Attachment attachment = new Attachment(fullPath))
                        {
                            htmlMessage.Attachments.Add(attachment);
                        }
                    }
                    else
                    {
                        // 触发SSIS警告事件，记录不存在的文件路径
                        Dts.Events.FireWarning(0, "邮件附件处理", $"文件不存在，已跳过：{fullPath}", "", 0);
                    }
                }

                mySmtpClient.Credentials = CredentialCache.DefaultNetworkCredentials;
                mySmtpClient.Send(htmlMessage);
            }
        }         

        #region ScriptResults declaration
        /// <summary>
        /// This enum provides a convenient shorthand within the scope of this class for setting the
        /// result of the script.
        /// 
        /// This code was generated automatically.
        /// </summary>
        enum ScriptResults
        {
            Success = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Success,
            Failure = Microsoft.SqlServer.Dts.Runtime.DTSExecResult.Failure
        };
        #endregion     
    }
}

关键修改说明 #

• 添加必要命名空间：引入System.IO用于文件路径处理、System.Linq用于过滤空路径
• 拆分并清理附件路径：用Split('|')拆分字符串，通过Trim()去除路径首尾空格，Where过滤空字符串，避免无效路径导致的错误
• 拼接完整路径：结合项目参数$Project::parFolderSource，自动将相对路径转为完整绝对路径
• 循环添加附件：遍历所有有效路径，创建Attachment实例并添加到邮件中；使用using确保附件资源正确释放
• 文件存在校验：添加File.Exists判断，遇到不存在的文件时触发SSIS警告事件，避免整个任务失败

注意事项 #

• 确保脚本任务的ReadOnlyVariables已包含所有用到的参数：$Package::parAttachment、$Package::parFromLine、$Package::parToLine、$Package::parSubject、$Package::parBody、$Project::parFolderSource
• 确认SSIS执行账户对附件路径有读取权限
• 若不需要相对路径拼接逻辑，可直接使用fullPath = path替换相关代码

内容的提问来源于stack exchange，提问作者Henrov