C#實現在Sql Server中存儲和讀取Word文件

要實現在Sql Server中實現將文件讀寫Word文件，需要在要存取的表中添加Image類型的列，示例表結構為:

CREATE TABLE CONTRACTS (
    ID VARCHAR (50),
    CONTRACT_FILE IMAGE
);

要將Word文件存儲到數據庫的CONTRACT_FILE字段中，需要將文件轉換為byte數組，具體代碼如下：

 /// <summary>
        /// 將文件轉換為Bytes
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public static byte[] File2Bytes(string fileName)
        {
            FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Read);
            byte[] fileDatas = new byte[fs.Length];
            fs.Read(fileDatas, 0, System.Convert.ToInt32(fs.Length));
            fs.Close();
            return fileDatas;
        }

然后將轉換完成的byte[]存儲到數據庫的對應字段：

 /// <summary>
        /// 更新合同文件
        /// </summary>
        /// <param name="id"></param>
        /// <param name="fileBytes"></param>
        /// <returns></returns>
        public bool UpdateContractFile(string id, byte[] fileBytes)
        {
            string sql = "UPDATE CONTRACTS SET CONTRACT_FILE=@CONTRACT_FILE WHERE ID=@ID";
            using (SqlConnection conn = new SqlConnection(this.m_DataAccess.ConnectString))
            {
                conn.Open();
                using (SqlCommand cmd = new SqlCommand())
                {
                    cmd.Connection = conn;
                    cmd.CommandText = sql;
                    cmd.Parameters.Clear();

                    cmd.Parameters.Add(new SqlParameter("@CONTRACT_FILE", SqlDbType.Image));
                    cmd.Parameters["@CONTRACT_FILE"].Value = fileBytes;

                    cmd.Parameters.Add(new SqlParameter("@ID", SqlDbType.VarChar));
                    cmd.Parameters["@ID"].Value = id;

                    return cmd.ExecuteNonQuery() > 0 ? true : false;
                }
            }
        }

要讀取數據庫中存儲的Word文件，需要先將Image類型的字段轉換為bytes[]，具體代碼如下：

/// <summary>
        /// 獲取合同文件
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        public byte[] GetContractFile(string id)
        {
            string sql = "SELECT CONTRACT_FILE FROM CONTRACTS WHERE ID='{0}'";
            sql = string.Format(sql, id);
            object contractFile;
            contractFile = this.m_DataAccess.ExecuteScalar(sql);
            if (contractFile == null)
            {
                return new byte[0];
            }
            else
            {
                return (byte[])contractFile;
            }
        }

在獲取到文件的byte[]后，將該文件通過文件流操作存儲為Word文件，具體代碼如下：

byte[] fileBytes = this.m_ContractsBusiness.GetContractFile(id);
                if (fileBytes.Length == 0)
                {
                    XMessageBox.ShowError("未找到合同文件！");
                    return;
                }
                SaveFileDialog sfd = new SaveFileDialog();
                sfd.Filter = "Word文件(*.doc)|*.doc";
                if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    try
                    {
                        string saveFileName = sfd.FileName;
                        int arraysize = new int();//注意這句話
                        arraysize = fileBytes.GetUpperBound(0);
                        FileStream fs = new FileStream(saveFileName, FileMode.OpenOrCreate, FileAccess.Write);
                        fs.Write(fileBytes, 0, arraysize);
                        fs.Close();
                        if (XMessageBox.ShowQuestion("文件下載成功，是否立即打開文件？") ==
                            System.Windows.Forms.DialogResult.Yes)
                        {
                            Process.Start(saveFileName);
                        }
                    }
                    catch (Exception ex)
                    {
                        XMessageBox.ShowError("下載文件失敗！");
                    }